Reference profile
- Designation
- ASTM C591
- Title
- Unfaced Preformed Rigid Polyisocyanurate (PIR) Thermal Insulation
- Issuing body
- ASTM
- Current edition
- [verify]
- Status
- Library record: draft; official standard status [verify].
- Category
- Material & Fabrication
1
Overview
Specification for rigid polyisocyanurate (PIR) foam insulation used for cold service.
2
Scope & Applicability
Covers
- Thermal conductivity
- Temperature range
- Compressive strength
Does NOT cover (exclusions)
- Exclusions are not documented in this library record. Confirm the official publication, neighbouring codes, the adopted edition, and jurisdictional boundaries before application.
3
Key Requirements
Lifecycle requirements
- Cold service insulation specification
4
Technical Details
Specification for rigid polyisocyanurate (PIR) foam insulation used for cold service.
Components: PIR, Rigid foam, Cold insulation.
Where to find it in the codeRefer to the official table of contents and the sections cited by the project specification; section numbering can vary by edition.
5
Engineering Notes
- A common rigid foam for cold lines; requires an effective vapor barrier.
6
Related Standards
7
Source, Edition & Status
- Publisher
- ASTM
- Edition Year
- N/A
- Industries
- Petrochemical, Oil & Gas
- Content Status
- draft
- Last Reviewed
- 2026-07-01
- Last Updated
- 2026-07-01
- Verified By
- Engineering Reviewer
- Official Link
- N/A
This paraphrased summary is a discovery aid. Do not reproduce or substitute it for the copyrighted official publication or jurisdictional requirements.