ASTM E1730-19 (2025) PDF

Full title and description

ASTM E1730-19(2025) — Standard Specification for Rigid Foam for Use in Structural Sandwich Panel Cores. This specification defines requirements for rigid, closed‑cell polyurethane and polyisocyanurate thermal insulation foams intended as cores in structural sandwich panels (shelter and panel construction), including classification by nominal density and required physical and mechanical property limits for acceptance testing.

Abstract

This standard specifies material and performance requirements for unfaced, closed‑cell polyurethane and polyisocyanurate foam boards used as sandwich panel cores for shelters and related structural panels. It includes classification by type (density), required values for density, thermal conductivity, compressive and shear strength, percent closed cells, dimensional stability, flame resistance and impact resistance, and identifies service and processing temperature limits for the materials. The document is the E1730-19 edition reaffirmed/issued with a 2025 designation.

General information

• Status: Active (E1730-19 with 2025 designation/release).
• Publication date: 1 August 2025 (designated as ASTM E1730-19(2025)).
• Publisher: ASTM International.
• ICS / categories: Construction materials / Other construction materials — ICS code 91.100.99.
• Edition / version: Designation E1730-19 (original 2019 edition); noted with 2025 release designation (E1730-19(2025)). It revises the 2015 edition (ASTM E1730-15).
• Number of pages: 5 pages.

Scope

This specification covers rigid, closed‑cell polyurethane and polyisocyanurate thermal insulation foams for sandwich panel cores used in shelter construction and similar applications. Materials are specified for exposure to ambient temperatures from −25 °F to 160 °F (−32 °C to 71 °C), with the capability to withstand processing/laminating temperatures up to about 230 °F (110 °C) and painted surface temperatures experienced in service. The standard classifies unfaced foam boards into types by nominal density and prescribes acceptance test limits for physical and mechanical properties.

Key topics and requirements

• Classification of unfaced closed‑cell polyurethane and polyisocyanurate foams into types (density‑based: Types 1–4).
• Required physical properties and acceptance limits: density, thermal conductivity, percent closed cell, and dimensional stability (linear and volumetric).
• Mechanical property requirements: compressive strength, shear strength, and impact resistance criteria for panel core performance.
• Flame resistance / burn performance metrics: extinguish time and burn distance limits for acceptance testing.
• Service and processing temperature guidance (service −25 °F to 160 °F; processing/laminating up to ~230 °F).
• Requirement for homogeneous, closed‑cell morphology free of voids, unexpanded material, foreign inclusions, or seams.
• Acceptance sampling and test method references (standard practice for sampling and laboratory testing to verify specified limits).

Typical use and users

Used by sandwich panel manufacturers, insulation material suppliers, composite laminators, test laboratories, specifiers and procurement teams for relocatable shelters, modular buildings, refrigerated or climate‑sensitive enclosures, and other applications requiring lightweight structural insulation cores. Designers, quality control engineers and regulators reference the standard to ensure core materials meet thermal, mechanical and fire‑performance requirements for panel production and acceptance.

Related standards

This specification revises ASTM E1730-15 (previous edition). It is commonly used alongside ASTM test methods for foam and sandwich panel properties (examples: ASTM D1621 for compressive properties of rigid cellular plastics, and thermal insulation test methods referenced in building‑materials handbooks). Users should consult the standard’s referenced‑documents section for the specific test methods called out for acceptance testing.

Keywords

rigid foam, closed‑cell polyurethane, polyisocyanurate, sandwich panel core, thermal insulation, density classification, compressive strength, shear strength, percent closed cell, dimensional stability, flame resistance, impact resistance, relocatable shelter.

FAQ

Q: What is this standard?

A: ASTM E1730-19(2025) is a material specification that sets requirements for rigid closed‑cell polyurethane and polyisocyanurate foams used as cores in structural sandwich panels (shelters and similar panels).

Q: What does it cover?

A: It covers classification by density, required thermal and mechanical properties (density, thermal conductivity, compressive and shear strength, percent closed cells, dimensional stability), flame/ burn performance and acceptance testing criteria, plus temperature limits for service and processing.

Q: Who typically uses it?

A: Sandwich panel manufacturers, insulation suppliers, test laboratories, design engineers, and procurement/specification professionals working on shelters, modular structures and insulated panels.

Q: Is it current or superseded?

A: The document is shown with a 2025 designation (E1730-19(2025)) and is listed as active; it replaces/revises the 2015 edition (E1730-15). Users should confirm the active status and any later revisions with ASTM International before citing for procurement.

Q: Is it part of a series?

A: It is a stand‑alone ASTM specification for foam cores but sits within ASTM’s broader portfolio of standards addressing thermal insulation, cellular plastics and sandwich construction; related ASTM test methods and specifications are commonly referenced for complete test and performance characterization.

Q: What are the key keywords?

A: Rigid foam, polyisocyanurate, polyurethane, sandwich panel core, thermal insulation, density, compressive strength, shear strength, flame resistance, impact resistance.