<!doctypehtml PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><meta content=text/html;charset=utf-8 http-equiv=Content-Type><meta content=EN http-equiv=content-language><meta content="K&J Magnetics - Incredibly strong neodymium magnets at affordable prices. Large variety of stock rare earth magnets available."name=description><meta content="neodymium,magnets,strong,magnetic,magnet,neo,rare,earth,NIB,supermagnet,neodymium magnets,NdFeB,permanent,powerful"name=keywords><script src=includes/placeholders.min.js></script><link href=images/touch-icon.png rel=apple-touch-icon><script src=includes/jquery-3.5.1.min.js></script><script src=/js/ectcart.js></script><link href=css/ectcart.css rel=stylesheet><link href=css/minidropdowncart2.css rel=stylesheet><link href=includes/KJstyle8.css rel=stylesheet><meta content=width=device-width,initial-scale=1.0 name=viewport><meta content=http://www.kjmagnetics.com/images/blog/article2010.01.pic1-640.png name=ZOOMIMAGE><title>
   Shielding Materials
  </title><link href=includes/KJblog.css rel=stylesheet><style>@media screen and (min-width: 770px) {
	/* make wider right column */
	.holygrail .colmid {
		margin-left:-180px; 	/* Width of right column MC*/
	}
	.holygrail .colleft {
		left:330px;         	/* Left column width + right column width MC*/
	}
	.holygrail .col1 {
		margin:0px 195px 0px 165px;     	/* Centre column side padding:
								Left padding = left column width + centre column left padding width
								Right padding = right column width + centre column right padding width MC*/
	}
	.holygrail .col2 {
		width:150px;        	/* Width of left column content (left column width minus left and right padding) MC*/
	}
	.holygrail .col3 {
		width:180px;        	/* Width of right column content (right column width minus left and right padding) MC*/
	}
}

.shareicon {
	width:32px;
	}</style><body><style>.KJtaxannouncement {
	background-color:#38F;
	color:#f8f8f8;
	padding:6px;
	text-align:center;
	border-bottom:1px solid black;
}</style><div class=KJtaxannouncement><div>We are now required to collect sales tax in several states. If your business is tax exempt, learn more <a href=salestaxinfo.asp style=color:black;> here </a> .</div></div><div class=header><div class=kjleftstuff><div class=kjjoe><a href=/ name=magnet> <img alt border=0 src=images/clearpixel.gif> </a></div><div class=kjlogo2><a href=/ name=magnet> <img alt="   K&J Magnetics"border=0 src=images/clearpixel.gif> </a></div><div class=kjsearch><form action=/search-kj.asp autocomplete=on id=zoom_search><input placeholder="Search K&J Magnetics..."class=kjsearchfield id=zoom_searchbox list=pnlist name=zoom_query size=20><input class=kjsearchbut name=sa type=submit value=Go></form></div><script src=includes/searchHelper.js></script><div class=kjmobilemenucontainer><div class=kjmobilemenu2><nav role=navigation><div id=menuToggle><input type=checkbox><span> </span><span> </span><span> </span><ul class=kjmob id=kjmmenu><a href=clientlogin.asp> <li class="kjmobli kjmoblili">My Account</li> </a><a onclick="return dologoutaccount()"href=#> <li class="kjmobli kjmoblili">Logout</li> </a><a onclick="return displayloginaccount()"href=clientlogin.asp> <li class="kjmobli kjmoblilo">Login</li> </a><a> <li class="kjmobli kjmoblilo"></li> </a><hr><a href=categories.asp> <li class=kjmobli>Products</li> </a><a href=neomaginfo.asp> <li class=kjmobli>Neo Mag Info</li> </a><a href=order.asp> <li class=kjmobli>Order/Ship Info</li> </a><a href=safety.asp> <li class=kjmobli>Safety</li> </a><a href=faq.asp> <li class=kjmobli>FAQ</li> </a><a href=blog.asp> <li class=kjmobli>Blog</li> </a><a href=glossary.asp> <li class=kjmobli>Glossary</li> </a><a href=uses.asp> <li class=kjmobli>Uses</li> </a><a href=sitemap.asp> <li class=kjmobli>Site Map</li> </a><a href=about.asp> <li class=kjmobli>About Us</li> </a><a href=contact.asp> <li class=kjmobli>Contact Us</li> </a><hr><a href=products.asp?cat=1> <li class=kjmobli>Discs/Cylinders</li> </a><a href=products.asp?cat=11> <li class=kjmobli>Blocks</li> </a><a href=products.asp?cat=16> <li class=kjmobli>Rings</li> </a><a href=products.asp?cat=12> <li class=kjmobli>Spheres</li> </a><a href=products.asp?cat=164> <li class=kjmobli>Plastic/Rubber</li> </a><a href=categories.asp?cat=86> <li class=kjmobli>Mounting Magnets</li> </a><a href=products.asp?cat=173> <li class=kjmobli>Countersunk</li> </a><a href=products.asp?cat=168> <li class=kjmobli>Grade N52</li> </a><a href=products.asp?cat=17> <li class=kjmobli>Surplus</li> </a><a href=categories.asp?cat=19> <li class=kjmobli>Other Items</li> </a><a href=products.asp?cat=17> <li class=kjmobli>Best Sellers</li> </a><a href=categories.asp?cat=190> <li class=kjmobli>Applications</li> </a><a href=custom.asp> <li class=kjmobli>Custom Magnets</li> </a><a href=calculator.asp> <li class=kjmobli>Magnet Calculator</li> </a></ul></div></nav></div><a style="color: #000000;font-family: Tahoma,sans-serif;background: #e8e8e8;padding: 2px 8px 2px 8px;float:right;"href=cart.asp> <img alt src=images/cart.2.gif>   Cart </a></div></div><style>.kjloginbar {
		/*background-color:#38F;*/
		position: absolute;
		
		/*padding:6px 10px;*/
		/*float:left;*/
		/*color:#f8f8f8;
		text-align:center;*/
		
		width:210px;
		height:20px;
		padding: 0px 0px 0px 0px; /*MC*/
		
		/*display:none;*/
	}

	.kjviewcart {
		/*float:left;*/
		/*width:150px;*/
	}
	.kjshippolicydets {
		/*clear:both;*/
	}</style><div class=kjrightstuff><div class=kjloginbar><script>var liajaxobj,liajaxobj2;
function naajaxcallback(){
	if(liajaxobj.readyState==4){
		postdata="email=" + encodeURIComponent(document.getElementById('naemail').value) + "&pw=" + encodeURIComponent(document.getElementById('pass').value);
		document.getElementById('newacctpl').style.display='none';
		document.getElementById('newacctdiv').style.display='';
		if(liajaxobj.responseText.substr(0,7)=='SUCCESS'){
			document.getElementById('newacctdiv').innerHTML="<div style=\"margin:80px;text-align:center\">Your account was created successfully. A confirmation email has been sent to your email address. Once you confirm your account, you will be able to login.</div>";

			liajaxobj2=window.XMLHttpRequest?new XMLHttpRequest():new ActiveXObject("MSXML2.XMLHTTP");
			liajaxobj2.open('POST','https://www.kjmagnetics.com/vsadmin/ajaxservice.asp?action=loginaccount',true);
			liajaxobj2.setRequestHeader('Content-type','application/x-www-form-urlencoded');
			liajaxobj2.send(postdata);

			setTimeout("document.location.reload()",1200);
		}else{
			document.getElementById('accounterrordiv').innerHTML=liajaxobj.responseText.substr(6);
			var className=document.getElementById('accounterrordiv').className;
			if(className.indexOf('ectwarning')==-1)document.getElementById('accounterrordiv').className+=' ectwarning cartnewaccloginerror';

		}
	}
}
var checkedfullname=false;
function checknewaccount(){
var tobj=document.getElementById('naname');
if(tobj.value==""){
	alert("Please enter a value in the field \"Full Name\".");
	tobj.focus();
	return(false);
}
var regex=/ /;
if(!checkedfullname && !regex.test(tobj.value)){
	alert("This message will not be shown again.\nPlease be sure to enter your first and last name in the field \"Full Name\".");
	tobj.focus();
	checkedfullname=true;
	return(false);
}
var regex=/[^@]+@[^@]+\.[a-z]{2,}$/i;
var tobj=document.getElementById('naemail');
if(!regex.test(tobj.value)){
	alert("Please enter a valid email address.");
	tobj.focus();
	return(false);
}
//al adds something here to check naemail against the verify field, naemail2
if (tobj.value.toLowerCase() != document.getElementById('naemail2').value.toLowerCase()) {
	alert("The emails you entered do not match.");
	tobj.focus();
	return false;
}
var tobj=document.getElementById('pass');

if(tobj.value.length<6){
	alert("Please enter at least 6 characters in the field \"Password\".");

	tobj.focus();
	return(false);
}
	
 	postdata="fullname=" + encodeURIComponent(document.getElementById('naname').value) + "&email=" + encodeURIComponent(document.getElementById('naemail').value) + "&pw=" + encodeURIComponent(document.getElementById('pass').value);
	 
	document.getElementById('newacctdiv').style.display='none';
	document.getElementById('newacctpl').style.display='';
	liajaxobj=window.XMLHttpRequest?new XMLHttpRequest():new ActiveXObject("MSXML2.XMLHTTP");
	liajaxobj.onreadystatechange=naajaxcallback;
	liajaxobj.open('POST','vsadmin/ajaxservice.asp?action=createaccount',true);
	liajaxobj.setRequestHeader('Content-type','application/x-www-form-urlencoded');
	liajaxobj.send(postdata);
	return false;
}
var lastloginattempt;
function checklogintimeout(){
	var thistime=new Date().getTime();
	var timeremaining=(lastloginattempt+5000)-thistime;
	if(timeremaining<0){
		document.getElementById('cartaccountlogin').disabled=false;
		document.getElementById('fclitspan').innerHTML="now";
	}else{
		document.getElementById('fclitspan').innerHTML="in %s seconds".replace('%s',Math.ceil(timeremaining/1000));
		setTimeout('checklogintimeout()',1000);
	}
}
function laajaxcallback(){
	var lirefs=[];	if(liajaxobj.readyState==4){
		document.getElementById('loginacctpl').style.display='none';
		document.getElementById('loginacctdiv').style.display='';
		if(liajaxobj.responseText.substr(0,10)=='DONELOGOUT'){
			document.getElementById('loginacctdiv').innerHTML="<div style=\"margin:80px;text-align:center\">You have logged out successfully!</div>";
			setTimeout("document.location.reload()",1000);
		}else if(liajaxobj.responseText.substr(0,7)=='SUCCESS'){
			document.getElementById('loginacctdiv').innerHTML="<div style=\"margin:80px;text-align:center\">Login Successful!</div>";
			if(lirefs[liajaxobj.responseText.split(':')[1]])
				setTimeout("document.location='" + lirefs[liajaxobj.responseText.split(':')[1]] + "'",1000);
			else

				setTimeout("document.location.reload()",1000);

		}else{
			var responsetext=liajaxobj.responseText.substr(7);
			if(liajaxobj.responseText.substr(6,1)=='1'){
				var thistime=new Date().getTime();
				var timeremaining=(lastloginattempt+5000)-thistime;
				responsetext=responsetext.replace('%s',Math.ceil(timeremaining/1000));
				document.getElementById('cartaccountlogin').disabled=true;
				setTimeout('checklogintimeout()',1000)
			}else
				lastloginattempt=new Date().getTime();
			document.getElementById('liaccterrordiv').innerHTML=responsetext;
			var className=document.getElementById('liaccterrordiv').className;
			if(className.indexOf('ectwarning')==-1)document.getElementById('liaccterrordiv').className+=' ectwarning';
		}
	}
}
function checkloginaccount(){
	var regex=/[^@]+@[^@]+\.[a-z]{2,}$/i;
	var testitem=document.getElementById('liemail');
		// AL this is where the cart makes you have a valid email address
	
	if(!regex.test(testitem.value)){
		alert("Please enter a valid email address.");
		testitem.focus();
		return(false);
	}
	
	testitem=document.getElementById('lipass');
	if(testitem.value==""){
		alert("Please enter a value in the field \"Password\".");
		testitem.focus();
		return(false);
	}
	document.getElementById('loginacctdiv').style.display='none';
	document.getElementById('loginacctpl').style.display='';
	liajaxobj=window.XMLHttpRequest?new XMLHttpRequest():new ActiveXObject("MSXML2.XMLHTTP");
	liajaxobj.onreadystatechange=laajaxcallback;
	
	postdata="email=" + encodeURIComponent(document.getElementById('liemail').value) + "&pw=" + encodeURIComponent(document.getElementById('lipass').value);//+ (document.getElementById('licook').checked?'&licook=ON':'');
	liajaxobj.open('POST','vsadmin/ajaxservice.asp?action=loginaccount',true);
	liajaxobj.setRequestHeader('Content-type','application/x-www-form-urlencoded');
	liajaxobj.send(postdata);

	return false;
}
function dologoutaccount(){
	document.getElementById('loginacctdiv').style.display='none';
	document.getElementById('alopaquediv').style.display=''
	document.getElementById('loginacctpl').style.display='';
	liajaxobj=window.XMLHttpRequest?new XMLHttpRequest():new ActiveXObject("MSXML2.XMLHTTP");
	liajaxobj.onreadystatechange=laajaxcallback;
	liajaxobj.open('GET','vsadmin/ajaxservice.asp?action=logoutaccount',true);
	liajaxobj.setRequestHeader('Content-type','application/x-www-form-urlencoded');
	liajaxobj.send(null);

	return false;
}
function displaynewaccount(){
	document.getElementById('alopaquediv').style.display='none';
	document.getElementById('acopaquediv').style.display=''

	return false;
}
var nacaptchawidgetid='';
var nacaptchaok=false;
var nacaptcharesponse=false;
function displayloginaccount(){
	if(document.getElementById('liemail')) document.getElementById('liemail').disabled=false;
	document.getElementById('alopaquediv').style.display='';
	return false;
}
function hideaccounts(){
	if(document.getElementById('liemail')) document.getElementById('liemail').disabled=true;
	document.getElementById('alopaquediv').style.display='none';
	document.getElementById('acopaquediv').style.display='none';
	return false;
}
// al adds to make enter key submit login and create account button
document.addEventListener("keyup", function(e){
	if (e.keyCode === 13) {
		var ALActive = document.activeElement.id;
		if (ALActive === "lipass" || ALActive === "liemail") {
			document.getElementById("cartaccountlogin").click();
		}else if(ALActive === "naemail" || ALActive === "naname" || ALActive === "pass" || ALActive === "naemail2"){
			document.getElementsByClassName("createaccount")[0].click();

		}
		// console.log(ALActive);
		
	}
	
})</script><div id=alopaquediv style=display:none;position:fixed;width:100%;height:100%;background-color:rgba(140,140,150,0.5);top:0px;left:0px;z-index:10000><div style="margin:120px auto 0 auto;background:#FFF;padding:6px;border-radius:5px;box-shadow:1px 1px 5px #333"class=accloginwrapper><div class="scart scclose"><img alt="Close Window"onclick=hideaccounts() src=images/close.gif style=cursor:pointer></div><div id=loginacctpl style=display:none;text-align:center><img alt=Loading src=images/preloader.gif style=margin:30px></div><div class=cartlogin_cntnr id=loginacctdiv><div class=cartloginheader id=liaccterrordiv>Login Details</div><div class="cartloginemail_cntnr flexvertalign"><div class=cartloginemailtext><label for=liemail>Email</label></div><div class=cartloginemail><input disabled id=liemail name=liemail placeholder=Email size=31></div></div><div class="cartloginpwd_cntnr flexvertalign"><div class=cartloginpwdtext><label for=lipass>Password</label></div><div class=cartloginpwd><input autocomplete=off id=lipass name=lipass placeholder=Password size=31 type=password></div></div><div class=cartloginbuttons_cntnr><div class=cartloginlogin><input class="ectbutton cartaccountlogin"id=cartaccountlogin onclick=checkloginaccount() type=button value=Submit></div><div class=cartloginnewacct><input class="ectbutton newaccount"value="New Account"onclick=displaynewaccount() type=button></div><div class=cartloginforgotpwd><input class="ectbutton forgotpassword"value="Forgot Password?"onclick=ectgonoabs('clientlogin.asp?mode=lostpassword') type=button></div></div></div></div></div><div id=acopaquediv style=display:none;position:fixed;width:100%;height:100%;background-color:rgba(140,140,150,0.5);top:0px;left:0px;z-index:10000><div style="margin:120px auto 0 auto;background:#FFF;padding:6px;border-radius:5px;box-shadow:1px 1px 5px #333"class=acccreatewrapper><div class="scart scclose"><img alt="Close Window"onclick=hideaccounts() src=images/close.gif style=cursor:pointer></div><div id=newacctpl style=display:none;text-align:center><img alt=Loading src=images/preloader.gif style=margin:30px></div><div class=cartnewaccount_cntnr id=newacctdiv><div class=cartnewaccountheader id=accounterrordiv>New Account</div><div class="cartacctloginname_cntnr flexvertalign"><div class=cartacctloginnametext><span class=redstar style=color:#FF1010> * </span><label for=naname>Company Name or Full Name</label></div><div class=cartacctloginname><input placeholder="Full Name"id=naname name=naname size=30></div></div><div class="cartaccloginemail_cntnr flexvertalign"><div class=cartaccloginemailtext><span class=redstar style=color:#FF1010> * </span><label for=naemail>Email</label></div><div class=cartaccloginemail><input id=naemail name=naemail placeholder=Email size=30 type=email></div></div><div class="cartaccloginemail_cntnr flexvertalign"><div class=cartaccloginemailtext><span class=redstar style=color:#FF1010> * </span><label for=naemail2>Verify Email</label></div><div class=cartaccloginemail><input placeholder="Verify Email"id=naemail2 name=naemail2 size=30 type=email></div></div><div class="cartaccloginpassword_cntnr flexvertalign"><div class=cartaccloginpasswordtext><span class=redstar style=color:#FF1010> * </span><label for=pass>Password</label></div><div class=cartaccloginpassword><input autocomplete=off id=pass name=pass placeholder=Password size=30 type=password></div></div><div><br> Is your business tax exempt? Send us your tax exempt form to <a href=mailto:salestax@kjmagnetics.com?subject=Request%20Tax%20Exemption&body=I%20would%20like%20to%20request%20tax%20exempt%20status%20for%20my%20business.%20Please%20find%20the%20relevant%20paperwork%20attached.%0A%0AI%20understand%20that%20sales%20tax%20will%20be%20included%20on%20my%20online%20orders%20until%20after%20K%26J%20Magnetics%20receives%20and%20approves%20my%20tax%20exempt%20certificate.%20(K%26J%20will%20send%20an%20email%20when%20this%20is%20complete.)%0A%0AOur%20online%20account%20is%20setup%20under%20the%20email%20address%3A%20_____%0A> salestax@kjmagnetics.com </a> . After we review and approve your submission (allow 3-5 business days), your orders placed online will not include sales tax when you are logged in. <br><br> If tax exempt, the Company Name field above must match the name on your tax exempt certificate.</div><div class=cartaccloginalsubmit><input class="ectbutton createaccount"value="Create Account"onclick=checknewaccount() type=button></div></div><div style=clear:both></div></div></div><script>document.body.appendChild(document.getElementById('alopaquediv'));document.body.appendChild(document.getElementById('acopaquediv'));</script><style>/*move to kjstyle or somewhere else*/
	.dropbtn {
    background: rgb(51, 136, 255); 
	background: rgba(51, 136, 255, 0); 
    color: white;
    /*margin: 0px 10px 0px 0px;*/
	padding: 3px 0px 3px 0px;
    font-size: 14px;
    border: none;
    cursor: pointer;
	font-family: Verdana,Helvetica,sans-serif;
	width:195px;
}

.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown a {
	color: white;
	}
	
.dropdown-content {
    display: none;
    position: absolute;
    right: 0;
    background-color: #fff;/*#f9f9f9;*/
    min-width: 195px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
	padding: 0px 0px 0px 0px;
}

.dropdown-content a {
    color: black;
    padding: 10px 16px;
    text-decoration: none;
    display: block;
	text-align: right;
}

.dropdown-content a:hover {
	/*background-color: #f1f1f1*/
	background-color: #38F;
	color: white;	
	}

.dropdown:hover .dropdown-content {
    display: block;
}

.dropdown:hover .dropbtn {
    background-color: #38f;
}</style><div class=dropdown style=display:none><button class=dropbtn><a class="ectlink mincart"href=clientlogin.asp> <span> </span> <img src=images/arrow-down.png> </a></button><div class=dropdown-content><a href=clientlogin.asp> Account Info </a><a onclick="return dologoutaccount()"href=#> Logout </a></div></div><div class=ddlogin><a onclick="return displayloginaccount()"href=# style=color:white;> Login </a></div><script>//ajax minicart display updater
			$(document).ready(function () {
					// console.log("Document");

					var kjlogin = document.getElementsByClassName("kjloginbar")[0];
					var ddlogin = kjlogin.getElementsByClassName("ddlogin")[0];
					var dropdown = kjlogin.getElementsByClassName("dropdown")[0];
					var kjmoblili = document.getElementsByClassName("kjmoblili");
					var kjmoblilo = document.getElementsByClassName("kjmoblilo");

					// al initially display nones these
					for (var i = 0; i < kjmoblili.length; i++) {
							kjmoblili[i].style.display = "none";
						}
					for (var i = 0; i < kjmoblilo.length; i++) {
							kjmoblilo[i].style.display = "none";
						}

					$.get("/vsadmin/ajaxloginstatus.asp", function (data, status) {
						//alert("Data: " + data + "\nStatus: " + status);
						var str = data;
						var n = str.indexOf(",");
						// document.getElementById("result1").innerHTML = str;
						// document.getElementById("result2").innerHTML = n;
						// document.getElementById("result3").innerHTML = str.substr(0, n);
						// document.getElementById("result4").innerHTML = str.substr(n + 1);
						if (n > 0) {
							// document.getElementById("result5").innerHTML = "Yes!";
							// console.log("logged in!");
							dropdown.getElementsByTagName("span")[0].innerHTML = str.substr(n+1,n+20);
							if (str.substr(n+1).length > 20) {
								dropdown.getElementsByTagName("span")[0].innerHTML += '...';
								
							}
							
							dropdown.style.display = "block";
							ddlogin.style.display = "none";
							for (var i = 0; i < kjmoblili.length; i++) {
								kjmoblili[i].style.display = "block";
							}
							for (var i = 0; i < kjmoblilo.length; i++) {
								kjmoblilo[i].style.display = "none";
							}
						} else {
							// document.getElementById("result5").innerHTML = "No, I don't think so.";
							// console.log("not logged in!");
							dropdown.style.display = "none";
							
							ddlogin.style.display = "block";
							for (var i = 0; i < kjmoblilo.length; i++) {
								kjmoblilo[i].style.display = "block";
							}
							
							for (var i = 0; i < kjmoblili.length; i++) {
								kjmoblili[i].style.display = "none";
							}
						}

					});
				});</script></div><div class=kjviewcart><div class=ectdp_minicartmainwrapper_ct id=ectdp_minicartmainwrapper_ct><div class=ectdp_minicartmainwrapper><div class="minicartcnt_dp ectdp_minicartopen"onmouseout=startmcclosecount() onmouseover=domcopen()><img alt src=images/cart.2.gif>   <a class="ectlink mincart"href=http://www.kjmagnetics.com/cart.asp> Cart ( <span class=ectMCquant> 0 </span> ) </a></div><div class=ectdp_minicartcontainer id=ectdp_minicartcontainer onmouseout=startmcclosecount() onmouseover=domcopen() style=display:none;><div class="minicartcnt_dp ectdp_empty">Your shopping cart is currently empty</div><div class=minicartcnt_dp><a class=ectdp_minicartclose href=javascript:domcclose()> Close </a></div></div></div></div><script>var mctmrid=0,ajaxobj,ajaxobjrf;
function domcopen(){
	clearTimeout(mctmrid);
	document.getElementById('ectdp_minicartcontainer').style.display='';
}
function domcclose(){
	document.getElementById('ectdp_minicartcontainer').style.display='none';
}
function startmcclosecount(){
	mctmrid=setTimeout("domcclose()",400);
}
function mcpagerefresh(){
	if(ajaxobj.readyState==4){
		//document.getElementById('ectdp_minicartmainwrapper_ct').innerHTML=ajaxobj.responseText;
		document.location.reload();
	}
}
function refreshmcwindow(){
	if(ajaxobjrf.readyState==4){
		//alert(ajaxobjrf.responseText);
		document.getElementById('ectdp_minicartmainwrapper_ct').innerHTML=ajaxobjrf.responseText;
	}
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    window.attachEvent("load", addbuttonclickevent);</script>  </div><div class=kjallorders>All orders placed & paid online by 1PM ET (M-F) will be shipped the same day! <br><span style=font-size:9pt;> <a href=samedayship.asp style=color:black;> Details </a> </span></div><div class=kjshippolicydets style=display:none;><a href=samedayship.asp> Click Here for our Shipping Policy Details </a></div><div class=kjtopmenucontainer><div class=kjtopmenu><a class=dark2 href=policies.asp> Policies </a>  |  <a class=dark2 href=contact.asp> Contact Us </a>  |  <a class=dark2 href=tracker.asp> Track Your Package </a></div></div></div></div><div id=kjcontainer><div class="colmask holygrail"><div class=colmid><div class=colleft><div class=col1wrap><div class=col1><div id=kjcontentproducts><div id=blogarticle><h2><a href=blog.asp?p=shielding-materials style=color:#000000;> Shielding Materials </a> <span style="float:right; margin: 0 0 0 15px;"> <a href="mailto:?subject=Shielding Materials&body=Check this out: http://www.kjmagnetics.com/blog.asp?p=shielding-materials"> <img alt=email class=shareicon src=images/share/email.png title=email> </a> <a href="http://twitter.com/share?url=http://www.kjmagnetics.com/blog.asp?p=shielding-materials&text=Shielding Materials"target=_blank> <img alt=twitter class=shareicon src=images/share/twitter.png title=twitter> </a> <a href="http://reddit.com/submit?url=http://www.kjmagnetics.com/blog.asp?p=shielding-materials/&title=Shielding Materials"target=_blank> <img alt="Share on Reddit"class=shareicon src=images/share/reddit.png title=reddit> </a> <a href="//pinterest.com/pin/create/button/?url=http://www.kjmagnetics.com/blog.asp?p=shielding-materials&description=Shielding Materials&media=http://www.kjmagnetics.com/images/blog/article2010.01.pic1-640.png"target=_blank> <img alt="Pin on Pinterest"class=shareicon src=images/share/pinterest.png title=pinterest> </a> <a href=http://www.facebook.com/sharer.php?u=http://www.kjmagnetics.com/blog.asp?p=shielding-materials target=_blank> <img alt="Share on Facebook"class=shareicon src=images/share/facebook.png title=facebook> </a> <a href=blogfeed.asp> <img alt=RSS class=shareicon src=images/share/rss.png> </a> </span></h2><h3>What material is best for shielding a magnet? How can I block a magnetic field?</h3><p>Have you ever wondered about how to shield a magnet? Can a magnetic field be blocked so a magnet only pulls on one side? Need to shield a sensitive device from magnetic fields?<h3>What is a Magnetic Shield?</h3><div class="KJpicc KJbigimg"><div class=KJpic><a href=images/blog/article2010.01.pic1-640.png> <img alt class=KJbigimg src=images/blog/article2010.01.pic1-640.png> </a></div></div><p class=bmh200>First, one important point must be clear: Magnetic shielding does not block a magnetic field. No material can stop the lines of flux from traveling from a magnet's orth pole to it's south pole. The field can, however, be redirected. <br> <br> In the series of pictures below, follow the lines of flux as paths from one pole of the magnet to the other. In the first, a magnet in free space is shown, with the field lines flowing through air. In the second, a wall of steel provides an "easier" path for the lines of flux to follow. These lines flow out from the magnet's pole, into the steel for some distance, and back out into the air to get back to the magnet's other pole. In the third picture, a steel enclosure reduces the ambient field strength inside by providing a path around either side of the space.<h3>What material will work?</h3><p>The short answer is: Any <a href=http://en.wikipedia.org/wiki/Ferromagnetic target=_blank> ferromagnetic </a> metal. That is, anything containing iron, nickel or cobalt. Most steels are ferromagnetic metals, and work well for a redirecting shield. Steel is commonly used because it's inexpensive and widely available. Note that some stainless steels, especially the 300 series varieties, are not ferromagnetic.<h3>How thick should my shield be?</h3><div class="KJpicc KJbigimg"><div class=KJpic><img alt class=KJbigimg src=images/blog/article2010.01.pic3p.gif></div><div class=KJcaption>See how the magnetic field changes as the wall thickness varies.</div></div><p class=bmh350>This will depend on many factors. What is the size and nature of the magnetic field you're shielding? What are you shielding it from? Does it make sense to shield the magnet, or your magnetically sensitive device? Is your shield a perfect sphere, a closed cylinder, or some other shape? <br> <br> The thickness of the shield matters, up to a point. When the shield is too thin, it becomes saturated, and can't "hold" any more lines of flux. You want it to be thick enough to hold as much flux as possible. However, once you reach a certain limit, adding steel thickness won't improve your shielding much. <br> <br> In some cases where saturation is an issue, multiple layers of material are used. <br> <br> See the animation at right, where the thickness of a steel wall is varied. Once it gets below a critical thickness, the material is saturated. It can't hold any more lines of flux. At that point, the flux pops out the far side, and travels through the air.<h3>But what about other metals?  Don't I need some fancier shielding material?</h3><p>Yes, there are some specialized materials specifically made for magnetic shielding. The foremost of these is MuMetal, an industry reference material defined in <a href=http://www.kjmagnetics.com/images/MIL-N-14411C.pdf> Milspec 14411C </a> . Companies that provide magnetic shielding materials typically offer a version of MuMetal, and some other proprietary alloys. Most of these have a high nickel content, with either 50% or 80% nickel in the mix.<p>Specialized magnetic shielding materials usually have a higher relative permeability, but a lower saturation point.<p>Permeability is the degree of magnetization of a material that responds linearly to an applied magnetic field. For shielding, Relative Permeability is the Permeability divided by the Permeability of free space, a constant. In more practical terms, Permeability is a measure of a material's ability to absorb magnetic flux. The higher the number, the better the shield.<p>Low carbon steels have a Permeability of 1000 - 3000, while MuMetal can have values as high as 300,000 - 400,000.<p>The saturation point is the flux density at which the material can not contain any more magnetic flux. Steel saturates around 22,000 Gauss, while MuMetal saturates at about 8,000 Gauss.<p>In lower flux density fields, such high permeability materials provide greater attenuation. In higher field densities, MuMetal becomes saturated, and loses its effectiveness. In these cases, steel provides good attenuation and a much higher saturation threshold.<h3>Conclusion</h3><p>Which material is right for you depends on your specific shielding problem. For low field strength, sensitive electronics, MuMetal can provide better shielding than steel. For many applications involving large, powerful neodymium magnets, the higher saturation point of steel serves better. 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(Big Magnets are Strong) </a><li><a class=kjm href=blog.asp?p=why-horseshoes> Why are Magnets Shaped like Horseshoes? </a><li><a class=kjm href=blog.asp?p=magnetic-separation> More About Magnetic Separation </a><li><a class=kjm href=blog.asp?p=magnetic-grates> Magnetic Grates </a><li><a class=kjm href=blog.asp?p=gaussmeter> Make a Magnetometer </a><li><a class=kjm href=blog.asp?p=bottle-opener> Magnetic Bottle Opener </a><li><a class=kjm href=blog.asp?p=cereal-contains-iron> Magnetic Cereal </a><li><a class=kjm href=blog.asp?p=magnetic-stripes> Credit Cards and Magnetic Stripes </a><li><a class=kjm href=blog.asp?p=mag-neato-toys> Mag-Neato Toys </a><li><a class=kjm href=blog.asp?p=magnetization-direction> All About Magnetization Direction </a><li><a class=kjm href=blog.asp?p=doubled-forces> Doubled Forces </a><li><a class=kjm href=blog.asp?p=magnets-are-weird> Magnets Are Weird </a><li><a class=kjm href=blog.asp?p=iphone-fun> iPhone Magnetic Measurements </a><li><a class=kjm href=blog.asp?p=mendocino-motor-2> Mendocino Motor </a><li><a class=kjm href=blog.asp?p=mendocino-motor-1> Pseudo-Levitation </a><li><a class=kjm href=blog.asp?p=leverage> Leverage & Friction </a><li><a class=kjm href=blog.asp?p=mounting-magnets> Mounting Magnets </a><li><a class=kjm href=blog.asp?p=spice-jars> Magnetic Spice Jars </a><li><a class=kjm href=blog.asp?p=earth-science> The Earth Is a Magnet </a><li><a class=kjm href=blog.asp?p=halbach-arrays> Halbach Arrays </a><li><a class=kjm href=blog.asp?p=aquarium> Aquarium Magnets </a><li><a class=kjm href=blog.asp?p=homopolar-motors> Homopolar Motors </a><li><a class=kjm href=blog.asp?p=car-signs> Vehicle Signs </a><li><a class=kjm href=blog.asp?p=magnetic-forces> Magnetic Forces </a><li><a class=kjm href=blog.asp?p=stir-bars> Stir Bars </a><li><a class=kjm href=blog.asp?p=adhesive-backed-magnets> Adhesive Backed Magnets </a><li><a class=kjm href=blog.asp?p=maglev-train> Maglev Trains </a><li><a class=kjm href=blog.asp?p=water-treatment> Magnetic Water Treatment </a><li><a class=kjm href=blog.asp?p=separating-magnets> How to Separate Strong Magnets </a><li><a class=kjm href=blog.asp?p=superconductors> Superconductor Levitation </a><li><a class=kjm href=blog.asp?p=magnet-grade> Magnet Grades </a><li><a class=kjm href=blog.asp?p=eddy-currents> Eddy Currents </a><li><a class=kjm href=blog.asp?p=gauss-guns> Gauss Guns </a><li><a class=kjm href=blog.asp?p=gap-calculator> Gap Calculator </a><li><a class=kjm href=blog.asp?p=diamagnetic-levitation> Diamagnetism and Levitation </a><li><a class=kjm href=blog.asp?p=shipping> Shipping Magnets </a><li><a class=kjm href=blog.asp?p=speakers> Audio Speakers </a><li><a class=kjm href=blog.asp?p=shake-flashlight> Shake Flashlight </a><li><a class=kjm href=blog.asp?p=magnetic-paint> Magnetic Paint </a><li><a class=kjm href=blog.asp?p=magnetic-meteorites> Magnetic Meteorites </a><li><a class=kjm href=blog.asp?p=pole-climbing-robot> Pole Climbing Robot </a><li><a class=kjm href=blog.asp?p=hanging-art-on-a-wall> Hanging Art on a Wall </a><li><a class=kjm href=blog.asp?p=steel-thickness-calculator> Steel Thickness Calculator </a><li><a class=kjm href=blog.asp?p=how-neodymium-magnets-are-made> How Neodymium Magnets are Made </a><li><a class=kjm href=blog.asp?p=magnet-basics> Magnet Basics </a><li><a class=kjm href=blog.asp?p=sewing-magnets> Sewing Magnets </a><li><a class=kjm href=blog.asp?p=pacemaker-safety> Pacemaker Safety </a><li><a class=kjm href=blog.asp?p=reed-switches-and-hall-effect-sensors> Reed Switches and Hall Effect Sensors </a><li><a class=kjm href=blog.asp?p=hard-drive-destruction> Hard Drive Destruction </a><li><a class=kjm href=blog.asp?p=temperature-and-neodymium-magnets> Temperature and Neodymium Magnets </a><li><a class=kjm href=blog.asp?p=magnetic-knife-holder> Magnetic Knife Holder </a><li><a class=kjm href=blog.asp?p=sticky-business-how-to-glue-neodymum-magnets> Sticky Business - How to Glue Neodymium Magnets </a><li><a class=kjm href=blog.asp?p=how-much-will-a-magnet-hold> How Much Will a Magnet Hold? </a><li><a class=kjm href=blog.asp?p=which-pole-is-north> Which Pole Is North? </a><li><a class=kjm href=blog.asp?p=surface-fields-101> Surface Fields 101 </a><li><a class=kjm href=blog.asp?p=shielding-materials> Shielding Materials </a></ul></div></div><div class=KJfooter2012><div class=KJfootercol><span class=KJfooterlistheader> Magnet Shapes & Categories </span><ul><li><a class=kjm href=products.asp?cat=1> Discs/Cylinders </a><li><a class=kjm href=products.asp?cat=11> Blocks </a><li><a class=kjm href=products.asp?cat=16> Rings </a><li class=KJabbrev><a class=kjm href=products.asp?cat=12> Spheres </a><li><a class=kjm href=products.asp?cat=17> Surplus </a><li><a class=kjm href=categories.asp?cat=86> Mounting Magnets </a><li class=KJabbrev><a class=kjm href=products.asp?cat=164> Plastic & Rubber Coated </a><li><a class=kjm href=categories.asp?cat=173> Countersunk </a><li><a class=kjm 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