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Table 1. CAN/ULC-S701-05 Type 4 Material Properties
Property Unit Requirements
Thermal resistance of a 25-mm-thick specimen m 2·°C/W ≥ 0.86
Long-term thermal resistance Footnote (1) m 2·°C/W ≥ 1.73
Water vapour permeance for a 25-mm-thick specimen ng/(Pa·s·m 2) ≤ 60 Footnote (2)
Dimensional stability % linear change ≤ 1.5
Flexural strength kPa ≥ 350
Water absorption % by volume ≤ 0.7
Compressive strength kPa ≥ 210
Limiting oxygen index % ≥ 24