Crossword clues for Insulation material 4 lettersAnswerClueMICAInsulation materialOPALInsulation materialFOAMInsulation materialFELTInsulative materialASBESTOSInsulation materialAEROGELSkylight insulation material, perhapsOKONITEInsulating material.MYLARInsulation materialMYELINElectrically insulating material around nerve fibersASBESTOSHazardous insulation materialASBESTOSInsulation material on Time's list of the 50 worst inventionsTARPAPERInsulating material.EBONITEElectrical insulation materialFRICTIONTAPEInsulating adhesive materialSILICONEInsulation and sealing materialSTYRENEMaterial used in making insulationAEROGELUltralight material that's an extremely effective insulator