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Table 1. Physical Requirements for TPO Sheet Membrane
Property Unit Requirement
Thickness, sheet-overall Footnote (1) mm ≥ 1.0
Coating over fabric or scrim, weathering side only mm ≥ 0.38
Breaking strength N ≥ 976
Elongation at reinforcement break % ≥ 15
Tearing strength N ≥ 245
Brittleness point Footnote (2) ˚C ≤ –40
Ozone resistance (visual inspection) n/a no cracks
Retention of properties after heat aging Footnote (3) - breaking strength % ≥ 90
Retention of properties after heat aging Footnote (3) - elongation at reinforcement break % ≥ 90
Retention of properties after heat aging Footnote (3) - tearing strength % ≥ 60
Retention of properties after heat aging Footnote (3) - weight change (mass) % ≤ ±1
Linear dimensional change % ≤ ±1
Factory seam strength N ≥ 290
Weather resistance (visual inspection) Footnote (3) n/a no cracks or crazing
Water absorption (mass increase) Footnote (4) % ≤ ±3