Nanotechnology Based Nano Modified Performance Polymers Expansion Joint Compound is a two- component epoxy resin formulation intended as a flexible foundation seam sealant. It is self- levelling, flows smoothly and has good adhesive strength and flexibility over a wide temperature range. Nanotechnology Based Nano Modified Performance Polymers Expansion Joint Compound is used to seal joints where expansion and contraction movement will take place. For best results, design the joint to be twice as wide as is deep.