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| Term | Description |
|---|---|
| Penetration | (1) Any construction (e.g., pipes, conduits, HVAC supports) passing through a roof or waterproofing system; (2) the consistency of a bituminous material expressed as the distance, in tenths of a millimeter (0.1 mm), that a standard needle penetrates vertically into a sample of material under specified conditions of loading, time and temperature (ASTM D5 is the test method used for bituminous materials). A cone is sometimes used for special purposes instead of a needle. |