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Table 1. Performance and Physical Requirements for Vapour Barriers (Type 1)
Property Unit Requirement
Length Not less than specified
Width Not less than 99% of specified
Tensile strength, machine direction: ASTM D 828 N/mm Min. 3.5
Tensile strength, machine direction: ASTM D 882, Method A MPa Min. 12
Tensile strength , transverse direction: ASTM D 882, Method A MPa Min. 8
Elongation, machine direction: ASTM D 882, Method A % Min. 225
Elongation, transverse direction: ASTM D 882, Method A % Min. 350
Pliability Must not crack when bent through 90º
around a 5-mm mandrel @ –10 ± 2ºC
Water vapour permeance - Type 1 (low permeance: ASTM E 96, water method) ng/Pa·s·m 2 Max. 15 (before and after aging)
Water vapour permeance - Type 2 (standard permeance: ASTM E 96, desiccant method) ng/Pa·s·m 2 Max. 45 (before aging)
Max. 60 (after aging)