Inner aluminum foil / PP inner liner → Core VIP vacuum panel (air silicon / fiberglass) → Outer PU rigid foam protective layer → PP/ABS outer shell
Core layer VIP: Gas-silica type λ≤0.002W/(m・K), fiberglass≤0.0025W/(m・K), vacuum thermal locking, insulation is more than 10 times that of PU;
Encased PU rigid foam: density 50~60 kg/m³, λ≈0.023 W/(m・K), fully encases VIP panels with edges and gaps covered, sealing board seams to prevent heat leakage while resisting impact and puncture to protect VIP from vacuum breakdown and air leakage;