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Table 1. Technical requirements for closed-cell polyurethane and polyisocyanurate foam thermal insulation tested to CAN/ULC-S704-03 Type 2, Class 2 products
Property Unit Physical Property Requirements
Compressive strength Min. kPa 140
Tensile strength, perpendicular to the plane of the facer Min. kPa 35
Flexural strength Min. kPa 275
Thermal resistance after conditioning, min. for 25-mm -thick product m2·°C/W 0.97
long-term thermal resistance (LTTR), min. for 50-mm thick product Footnote (1) m2·°C/W 1.90 (CAN/ULC-S704-03)
Water vapour permeance for 25.4-mm -thick product ng/(Pa∙s∙m2) ≥ 15 to ≤ 60

Dimensional stability (Width)

at –29°C , ambient (RH) Max. % linear change ± 2.0
at 80°C, ambient (RH) ± 2.0
at 70°C , 97% (RH) ± 2.0

Dimensional stability (Length)

at –29°C , ambient (RH) Max. % linear change ± 2.0
at 80°C , ambient (RH) ± 2.0
at 70°C , 97% (RH) ± 2.0
Water absorption Max. % by volume 3.5

Dimensional tolerances

width mm +4, –2
length +6, –4
thickness, ≤ 55 mm thick +4, –1.5
thickness, ≥ 55 mm thick +5, –2.5
flatness mm/m < 4
squareness, ≤ 1 200 mm in length < 5
squareness, ≥ 1 200 mm in length < 9