definition
strict definition
polyethylene foam
Thermal insulation made from polyethylene plastic foam containing gas-filled cavities.
Polyethylene foam is an insulating material made from one of the most common types of plastic. The foam is filled with air cavities to reduce heat conductivity. Polyethylene is a thermoplastic polymer, and is often used in packaging materials.
The cellular structure distinguishes the foam from a solid sheet of polyethylene. The cavities reduce heat transfer through the material.
Polyethylene is the polymer used here. Polyurethane and polyisocyanurate foams belong to separate material definitions despite their similar insulating purpose.
Related definitions
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cellulose spray
A mass of fine particulate plant fiber sprayed into wall and roof cavities for thermal insulation. -
cementitious foam
Thermal and acoustic insulation formed from magnesium oxide cement with air pockets introduced during foaming. -
phenolic foam
Phenolic polymer foam applied in place within wall or roof cavities for thermal insulation. -
polyisocyanurate foam
Insulating foam made from polyisocyanurate, a plastic similar to polyurethane. -
polyurethane foam
Insulating foam made from polyurethane and sprayed onto a surface or into a cavity. -
urea-formaldehyde foam
Sprayed insulation consisting of urea-formaldehyde, a yellowish synthetic resin.