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ASTM C591-15
- Standard Specification for Unfaced Preformed Rigid Cellular Polyisocyanurate<brk/> Thermal Insulation
- standard by ASTM International, 05/01/2015
- Publisher: ASTM
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1.1 This specification covers the types, physical properties, and dimensions of unfaced, preformed rigid cellular polyisocyanurate plastic material intended for use as thermal insulation on surfaces from -297°F (-183°C) to 300°F (149°C). For specific applications, the actual temperature limits shall be agreed upon by the manufacturer and purchaser.