T cells and B cells differ in the form of the antigen they recognize, and this affects which antigens they can detect. B cells bind to antigen on invaders that are found in circulation outside the cells of the body, while T cells detect only invaders that have somehow entered the cells of the body.
ABS, DWV, Solid or Cell Core sewer pipe. The solid pipe is composed of ABS at 99% while the cell core is composed of a cellular foam between 2 layers of ABS which makes the cell core pipe lighter.
TRYMER 4000 polyisocyanurate pipe insulation is a polyurethane modified polyisocyanurate cellular plastic supplied in the form of bunstock. The 4.0 pcf (64.0 kg/m) rigid foam can be fabricated into sheets and other shapes for a variety of thermal insulation and high-strength specialty applications.