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Table 1. Technical requirements for closed-cell polyurethane and polyisocyanurate foam thermal insulation tested to CAN/ULC-S704-03 and CAN/ULC-S704-11_ Type 3, Class 1 products
Property		Unit	Physical Property Requirements
Compressive strength		Min. kPa	170
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
Thermal resistance	long-term thermal resistance (LTTR), min. for 50-mm thick product ^{Footnote (1)}	m²·°C/W	1.80 (CAN/ULC-S704-11)^{Footnote (2)}
Water vapour permeance for 25.4-mm -thick product		ng/(Pa∙s∙m²)	≤ 15
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

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