ASTM C591-05

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 (150z73176;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 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 the standard. The values given in parentheses are for information only and may be approximate.
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.

General Information

• Status: Historical
• Publication Date: 30-Nov-2005
• 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

• Replaces: ASTM C591-01 - Standard Specification for Unfaced Preformed Rigid Cellular Polyisocyanurate Thermal Insulation
• Effective Date: 01-Dec-2005
• Replaced By: ASTM C591-07 - Standard Specification for Unfaced Preformed Rigid Cellular Polyisocyanurate Thermal Insulation
• Effective Date: 01-Jun-2007
• Referred By: ASTM C1696-20 - Standard Guide for Industrial Thermal Insulation Systems
• Effective Date: 01-Dec-2005
• Referred By: ASTM D1079-20 - Standard Terminology Relating to Roofing and Waterproofing
• Effective Date: 01-Dec-2005
• Referred By: ASTM C1774-13(2019) - Standard Guide for Thermal Performance Testing of Cryogenic Insulation Systems
• Effective Date: 01-Dec-2005
• Referred By: ASTM C1303/C1303M-22 - Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
• Effective Date: 01-Dec-2005
• Referred By: ASTM D7793-21 - Standard Specification for Insulated Vinyl Siding
• Effective Date: 01-Dec-2005

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C 591 – 05
Standard Specification for
Unfaced Preformed Rigid Cellular Polyisocyanurate
1
Thermal Insulation
This standard is issued under the fixed designation C591; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber 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 priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
1.1 This specification covers the types, physical properties,
and dimensions of unfaced, preformed rigid cellular polyiso-
2. Referenced Documents
cyanurate plastic material intended for use as thermal insula-
2
2.1 ASTM Standards:
tiononsurfacesfrom−297°F(−183°C)to300°F(150°C).For
C165 Test Method for Measuring Compressive Properties
specific applications, the actual temperature limits shall be
of Thermal Insulations
agreed upon by the manufacturer and purchaser.
C168 Terminology Relating to Thermal Insulating Materi-
1.2 This specification only covers “polyurethane modified
als
polyisocyanurate” thermal insulation which is commonly re-
C177 Test Method for Steady-State Heat Flux Measure-
ferred to as “polyisocyanurate” thermal insulation. This stan-
ments and Thermal Transmission Properties by Means of
dard does not encompass all polyurethane modified materials.
the Guarded Hot Plate Apparatus
Polyurethane modified polyisocyanurate and other polyure-
C203 Test Method for Breaking Load and Flexural Prop-
thane materials are similar, but the materials will perform
erties of Block-Type Thermal Insulation
differently under some service conditions.
C236 Test Method for Steady-State Thermal Performance
1.3 Thisstandardisdesignedasamaterialspecification,not
of Building Assemblies by Means of a Guarded Hot Box
a design document. Physical property requirements vary by
C272 Test Method for WaterAbsorption of Core Materials
application and temperature. At temperatures below -70°F
for Structural Sandwich Constructions
(-51°C) the physical properties of the polyisocyanurate insu-
C303 Test Method for Density of Preformed Block-Type
lation at the service temperature are of particular importance.
Thermal Insulation
Below -70°F (-51°C), the manufacturer and the purchaser
C335 Test Method for Steady-State Heat Transfer Proper-
must agree on what additional cold temperature performance
ties of Horizontal Pipe
properties, may be required to determine if the material can
C390 Criteria for Sampling and Acceptance of Preformed
function adequately for the particular application.
Thermal Insulation Lots
1.4 TablesintheAnnexA1addressrequirementsofunfaced
C411 Test Method for Hot Surface Performance of High
preformed rigid cellular polyisocyanurate thermal insulation
Temperature Thermal Insulation
manufactured with HCFC blowing agent.
C518 TestMethodfortheSteadyStateHeatFluxMeasure-
1.5 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
the Heat Flow Meter Apparatus
fire performance.
C550 Practice for Measuring Trueness and Squareness of
1.6 Thevaluesstatedininch-poundunitsaretoberegarded
Rigid Block and Board Thermal Insulation
as the standard. The values given in parentheses are for
C585 Practice for Inner and Outer Diameters of Rigid
information only and may be approximate.
Thermal Insulation for Nominal Sizes of Pipe and Tubing
1.7 This standard does not purport to address all of the
(NPS System)
safety concerns, if any, associated with its use. It is the
C871 Test Methods for Chemical Analysis of Thermal
responsibility of the user of this standard to establish appro-
Insulation Materials for Leachable Chloride, Fluoride,
1
This specification is under the jurisdiction of ASTM Committee C16 on
2
Thermal Insulation and is the direct responsibility of Subcommittee C16.22 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Inorganic and Nonhomogeneous Inorganic Thermal Insulation. contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Current edition approved Dec. 1, 2005. Published December 2005. Originally Standards volume information, refer to the standard’s Document Summary page on
approved in 1966. Last previous edition approved in 2001 as C591–01. the ASTM website.
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