Insulation
General function: To minimize and control the three modes of heat transfer by introducing low thermal conductivity elements to minimize solid conduction and convection.
General types: A polymer of low thermal conductivity fabricated into a low density foam with a multitude of small cells open or closed. Which contain some gas with a thermal conductivity half that of air .
Materials: polystyrene,polyisocyanurate,urea formaldehyde and urea based foams,phenolic foam,
Properties :fire resistance,production of nontoxic gases,prolong environmental effects.