They include less than 4% antimony by weight to avoid {TAIL ~ various poisoning effects} of antimony on {HEAD ~ the electrochemical processes} involved 
They include less than 4 % antimony by weight to avoid { TAIL ~ various poisoning effects } of antimony on { HEAD ~ the electrochemical processes } involved
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH