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ASTM C591-08

Historical Revision

Standard Specification for Unfaced Preformed Rigid Cellular Polyisocyanurate Thermal Insulation

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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 (150°C). For specific applications, the actual temperature limits shall be agreed upon by the manufacturer and purchaser.

1.2 This specification only covers polyurethane modified polyisocyanurate thermal insulation which is commonly referred to as polyisocyanurate thermal insulation. This standard does not encompass all polyurethane modified materials. Polyurethane modified polyisocyanurate and other polyurethane materials are similar, but the materials will perform differently under some service conditions.

1.3 This standard is designed as a material specification, not a design document. Physical property requirements vary by application and temperature. At temperatures below - 70°F (- 51°C) the physical properties of the polyisocyanurate insulation at the service temperature are of particular importance. Below - 70°F (- 51°C) the manufacturer and the purchaser must agree on what additional cold temperature performance properties are required to determine if the material can function adequately for the particular application.

1.4 Tables in the Annex A1 address requirements of unfaced preformed rigid cellular polyisocyanurate thermal insulation manufactured with HCFC blowing agent.

1.5 The use of thermal insulation material covered by this specification may be regulated by building codes that address fire performance.

1.6 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

This specification covers the types, physical properties, and dimensions of unfaced, preformed rigid cellular polyurethane modified polyisocyanurate plastic material intended for use as thermal insulation on surfaces. This insulation can be classified into six types according to its compressive resistance: Types I, IV, II, III, V, and VI. Also this insulation can be classified as Grades 1 and 2 according to its service temperature range. The thermal insulation is produced by the polymerization of polymeric polyisocyanates in the presence of polyhydroxyl compounds, catalysts, cell stabilizers, and blowing agents. Different test methods shall be performed in order to determine the thermal insulation's following properties: density, compressive resistance, apparent thermal conductivity, hot-surface performance, water absorption, water vapor permeability, dimensional stability, closed-cell content, surface bearing characteristics, tensile strength, and leachable chloride, fluoride, silicate, and sodium ions.


SDO ASTM: ASTM International
Document Number C591
Publication Date June 1, 2008
Language en - English
Page Count 6
Revision Level 08
Supercedes
Committee C16.22
Publish Date Document Id Type View
Dec. 1, 2022 C0591-22 Revision
April 15, 2021 C0591-21 Revision
May 15, 2020 C0591-20 Revision
Nov. 1, 2019 C0591-19A Revision
March 1, 2019 C0591-19 Revision
Sept. 1, 2017 C0591-17 Revision
April 15, 2016 C0591-16 Revision
May 1, 2015 C0591-15 Revision
Oct. 15, 2013 C0591-13 Revision
Oct. 15, 2012 C0591-12B Revision
June 1, 2012 C0591-12A Revision
April 15, 2012 C0591-12 Revision
May 15, 2011 C0591-11 Revision
Nov. 1, 2009 C0591-09 Revision
Dec. 1, 2008 C0591-08A Revision
June 1, 2008 C0591-08 Revision
June 1, 2007 C0591-07 Revision
Dec. 1, 2005 C0591-05 Revision
Nov. 10, 2001 C0591-01 Revision
Nov. 10, 2001 C0591-00 Revision
Not Available C0591-85 Revision