Lichen sclerosus and lichen planus are fairly common, non cancerous skin conditions. They can affect different parts of the body, but commonly affect the vulva. When they affect the skin of the vulva, theyâre known as vulval LS or LP.
A gap-graded soil is a soil that has an excess or deficiency of certain particle sizes or a soil that has at least one particle size missing. An example of a gap-graded soil is one in which sand of the No. 10 and No. 40 sizes are missing, and all the other sizes are present.
Close-up view of frac sand (on the right) and a typical sand of similar grain size (on the left). Notice how the frac sand has a very uniform grain size, nicely rounded grain shapes and a uniform composition. It is also a very tough material that can resist compressive forces of up to several tons per square inch.rac sand is produced in a range of sizes from as small as 0.1 millimeter in diameter to over 2 millimeters in diameter depending upon customer specifications. Most of the frac sand consumed is between 0.4 and 0.8 millimeters in size.