ISO 844:2026

Current Revision
Rigid cellular plastics - Determination of compressive properties

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ISO 844:2026

Rigid cellular plastics - Determination of compressive properties

PUBLISH DATE 2026
ISO 844:2026

This document specifies methods for determining the compressive strength, the corresponding compressive strain, the compressive stress at 10 % nominal compressive strain, and the compressive modulus of rigid cellular plastics.

Two procedures are specified: Procedure A and Procedure B.

Procedure A utilizes the compression plate displacement for the nominal property determination. It is used to determine:

  • compressive strength and the corresponding nominal compressive strain;
  • compressive stress at 10 % nominal compressive strain;
  • nominal compressive modulus.

Procedure B uses an extensometer and determines the conventional properties. It is used to determine:

  • compressive strength and the corresponding compressive strain;
  • compressive modulus.
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