PE. Foam : this plastic insulation is manufactured from polyethylene plastic with a density of approximately 2 Ibs/ft³. Most PE insulation is highly combustible and drops flaming balls (fire balls, causing flame transfer to other materials in buildings such as ceilings, carpets, and furniture.

PU.Foam : a polyurethane foam insulation made of polyols mixed with polyisocyanates. Although there may be some self-extinguishing grades,it burns releasing hydrogencyanide gas (HCN), It is one of the most noxious gases which is fatal to victims within a short time (HCN 300 ppm only will be fatally noxious within 2-3 minutes).

AEROFLEX : AEROFLEX is made from high quality synthetic elastomers which are nonhaloginated materials mixed with an optimum quantity of fire extinguishing and smoke suppressing chemicals. It will not melt nor drop flaming balls ( fire balls).It produces low smoke density. The main gases released when burned are hydrogencyanide gas. AEROFLEX is self extingguishing within a short time when the flame is removed .The main flame retardant chemical used in AEROFLEX is aluminium trihydrate (ATH) which when decomposed will give out water serving as a flame retarder under the following equation :

AEROFLEX can be classified as a fire safety insulating material.