ASTM C591-00

Standard Specification for Unfaced Preformed Rigid Cellular Polyisocyanurate Thermal Insulation

SCOPE
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, may be required to determine if the material can function adequately for the particular application.
1.4 The use of thermal insulation material covered by this specification may be regulated by building codes that address fire performance.
1.5 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only and may be approximate.
1.6 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.

General Information

• Status: Historical
• Publication Date: 09-Nov-2001
• ICS: 83.100 - Cellular materials
• ICS: 91.100.60 - Thermal and sound insulating materials
• Technical Committee: C16 - Thermal Insulation
• Drafting Committee: C16.22 - Organic and Nonhomogeneous Inorganic Thermal Insulations

Relations

• Replaced By: ASTM C591-01 - Standard Specification for Unfaced Preformed Rigid Cellular Polyisocyanurate Thermal Insulation
• Effective Date: 10-Nov-2001
• Referred By: ASTM C1774-13(2019) - Standard Guide for Thermal Performance Testing of Cryogenic Insulation Systems
• Effective Date: 10-Nov-2001
• Referred By: ASTM C1696-20 - Standard Guide for Industrial Thermal Insulation Systems
• Effective Date: 10-Nov-2001
• Referred By: ASTM D7793-21 - Standard Specification for Insulated Vinyl Siding
• Effective Date: 10-Nov-2001
• Referred By: ASTM D1079-20 - Standard Terminology Relating to Roofing and Waterproofing
• Effective Date: 10-Nov-2001
• Referred By: ASTM C1303/C1303M-22 - Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
• Effective Date: 10-Nov-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 591 – 00
Standard Specification for
Unfaced Preformed Rigid Cellular Polyisocyanurate
1
Thermal Insulation
This standard is issued under the fixed designation C 591; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope C 168 Terminology Relating to Thermal Insulating Materi-
2
als
1.1 This specification covers the types, physical properties,
C 177 Test Method for Steady-State Heat Flux Measure-
and dimensions of unfaced, preformed rigid cellular polyiso-
ments and Thermal Transmission Properties by Means of
cyanurate plastic material intended for use as thermal insula-
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the Guarded Hot Plate Apparatus
tion on surfaces from − 70°F (−51°C) to 300°F (150°C). For
C 203 Test Method for Breaking Load and Flexural Prop-
specific applications, the actual temperature limits shall be
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erties of Block-Type Thermal Insulation
agreed upon by the manufacturer and purchaser.
C 236 Test Method for Steady-State Thermal Performance
1.2 This specification only covers “polyurethane modified
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of Building Assemblies by Means of a Guarded Hot Box
polyisocyanurate” thermal insulation which is commonly re-
C 272 Test Method for Water Absorption of Core Materials
ferred to as “polyisocyanurate” thermal insulation. This stan-
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for Structural Sandwich Constructions
dard does not encompass all polyurethane modified materials.
C 303 Test Method for Density of Preformed Block-Type
Polyurethane modified polyisocyanurate and other polyure-
2
Thermal Insulation
thane materials are similar, but the materials will perform
C 335 Test Method for Steady-State Heat Transfer Proper-
differently under some service conditions.
2
ties of Horizontal Pipe
1.3 This standard is designed as a material specification, not
C 390 Criteria for Sampling and Acceptance of Preformed
a design document. Physical property requirements vary by
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Thermal Insulation Lots
application and temperature. Consult the manufacturer for
C 411 Test Method for Hot Surface Performance of High
specific recommendations and physical properties regarding
2
Temperature Thermal Insulation
applications, which include cryogenic service.
C 518 Test Method for the Steady State Heat Flux Measure-
1.4 The use of thermal insulation material covered by this
ments and Thermal Transmission Properties by Means of
specification may be regulated by building codes that address
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the Heat Flow Meter Apparatus
fire performance.
C 550 Practice for Measuring Trueness and Squareness of
1.5 The values stated in inch-pound units are to be regarded
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Rigid Block and Board Thermal Insulation
as the standard. The values given in parentheses are for
C 585 Practice for Inner and Outer Diameters of Rigid
information only and may be approximate.
Thermal Insulation for Nominal Sizes of Pipe and Tubing
1.6 Polyisocyanurate thermal insulation should be kept dry
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(NPS System)
during storage, shipping, installation, start-up, and operation.
C 976 Test Method for Thermal Performance of Building
1.7 This standard does not purport to address all of the
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Assemblies by Means of a Calibrated Hot Box
safety concerns, if any, associated with its use. It is the
C 1045 Practice for Calculating Thermal Transmission
responsibility of the user of this standard to establish appro-
2
Properties from Steady-State Heat Flux Measurements
priate safety and health practices and determine the applica-
C 1058 Practice for Selecting Temperatures for Evaluation
bility of regulatory limitations prior to use.
2
and Reporting Thermal Properties of Thermal Insulation
2. Referenced Documents
C 1114 Test Method for Steady-State Thermal Transmission
2
Properties by Means of the Thin-Heater Apparatus
2.1 ASTM Standards:
C 1303 Test Method for Estimating the Long-Term Change
C 165 Test Method for Measuring Compressive Properties
2
in the Thermal Resistance of Unfaced Rigid Closed Cell
of Thermal Insulations
Plastic Foams by Slicing and Sealing Under Controlled
3
Laboratory Conditions
1
This specification is under the jurisdiction of ASTM Committee C16 on
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D 883 Terminology Relating to Plastics
Thermal Insulation and is the direct responsibility of Subcommittee C16.22 on
Inorganic and Nonhomogeneous Inorganic Thermal Insulation.
Current edition approved May 10, 2000. Published August 2000. Originally
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published as C 591 – 66 T. Last previous edition C 591 – 94. Annual Book of ASTM Standards, Vol 15.03.
2 4
Annual Book of ASTM Standards, Vol 04.06. Annual Book of ASTM Standards, Vol 08.01.
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