Sandwich Panel

PUR (polyurethane) is a rigid polymer foam material produced by the reaction of polyols and isocyanates. It is widely used in building envelopes and refrigeration applications due to its excellent thermal insulation properties.
The typical density of PUR core material is approximately 40–42 kg/m³, with a thermal conductivity of ≥0.024 W/(m·K) and a closed-cell rate generally ranging from 85% to 90%.
Although it provides good thermal insulation, PUR core material has a fire resistance rating of Class B2 (Chinese Standard GB8624), and its maximum operating temperature is approximately 100°C. Due to the relatively low cost of its raw materials, PUR is well-suited for general insulation projects that are budget-sensitive and do not have extreme requirements for fire resistance or high-temperature resistance. Currently, the entire Tseason product line uses PIR core material.

PIR (polyisocyanurate) is an upgraded version of PUR. By adding isocyanate during the manufacturing process and introducing a cyclic structure, it becomes cross-linked polyisocyanurate, which enhances structural stability from within the molecule. This structure enhances PIR’s overall performance: it features a higher core density (approximately 48–50 kg/m³), a lower thermal conductivity of ≤0.022 W/(m·K), and superior thermal insulation and waterproofing properties. In terms of fire resistance and temperature resistance, PIR meets Class B1 standards (GB8624), exhibits high thermal stability, and can operate in environments up to 160°C.