The insulated wall panel is composed of 2 layers of galvanized steel plate (or aluminum plate) and a layer of insulation core material (EPS,PU and rock wool, etc.). Its environmental performance mainly depends on the insulation core material, from the following dimensions for comparative analysis.

 

Dimensions	EPS	PU（polyurethane）	Rock wool
Raw material and use release	New materials are non-toxic and formaldehyde-free; inferior recycled materials may release VOCs.	No release of high-quality products; TDI or harmful flame retardants are residual in low-quality products.	No chemical release, but may produce dust irritating respiratory tract.
Production and energy consumption	Energy consumption is moderate, and VOCs pollution may occur in the treatment of recycled materials.	Higher energy consumption, more environmentally friendly MDI process	High energy consumption (ore melting needs high temperature), need to control dust
Energy saving and carbon reduction	Thermal insulation medium (thermal conductivity 0.033-0.038W/(m · K))	Optimal thermal insulation (thermal conductivity ≤ 0.024W/(m · K)), energy saving and carbon reduction is the strongest	Weak insulation (thermal conductivity 0.040-0.048W/(m · K))
Combustion and Safety	Flammable, flame retardant may release toxic fumes	Flammable, high quality flame retardant smoke toxicity is low	Non-combustible (Class A1), no toxic smoke
Waste disposal	Refractory degradation, low recycling rate	Difficult to degrade, difficult to recycle	Natural degradation, landfill without chemical pollution