DIN EN ISO 844 E 2014-02 PDF

Full title and description

STB DIN EN ISO 844 E 2014-02 — Rigid cellular plastics — Determination of compression properties. National/adopted version of the DIN/EN/ISO text for determination of compressive strength, compressive stress at a given relative deformation and compressive modulus of rigid cellular plastics (rigid foams).

Abstract

This standard specifies laboratory methods to determine the compression properties of rigid cellular polymeric materials. It defines two test procedures (Procedure A using crosshead motion and Procedure B using direct strain measurement on the specimen), required specimen preparation and conditioning, test speeds, calculation methods for compressive strength, compressive stress at 10 % relative deformation and, where required, compressive modulus, and the format for reporting results.

General information

• Status: Superseded / withdrawn at international level (ISO 844:2014 has been revised; current edition published 2021). National adoption listed under STB / DIN EN ISO designation for 2014.
• Publication date: 2014 (title indicates 2014-02 for the STB adoption; ISO publication date: 2014-08; national DIN/EN adoptions may show other 2014 dates).
• Publisher: International Organization for Standardization (ISO) — national adoption published under DIN EN ISO designation and listed in some catalogs with STB prefix.
• ICS / categories: 83.100 — Cellular materials.
• Edition / version: Edition 6 (2014) — DIN/EN/ISO adoption (STB designation indicated in product title).
• Number of pages: 10 (original ISO 844:2014 document length).

Scope

The standard applies to rigid cellular plastics (rigid foams) and specifies methods for determination of: a) compressive strength and the associated relative deformation at maximum load, b) compressive stress at 10 % relative deformation, and c) where required, the compressive modulus. It covers specimen preparation and conditioning, two alternative test procedures (crosshead motion and direct strain measurement), equipment requirements and the required calculations and reporting.

Key topics and requirements

• Two test procedures: Procedure A (crosshead motion — for compressive stress at 10 % deformation) and Procedure B (strain measuring device/contact extensometer — for compressive modulus).
• Specimen geometry and selection rules (dimensions, face orientation, number of specimens to test).
• Conditioning prior to test (specified temperature and humidity and minimum conditioning time).
• Test equipment: calibrated compression testing machine, parallel platens, contact extensometer or equivalent strain measuring device for Procedure B.
• Test speeds and deformation rates appropriate to the procedure and material.
• Calculation methods for compressive strength, compressive stress at specified relative deformation (commonly 10 %) and compressive modulus.
• Reporting requirements: test method used, specimen identification and dimensions, conditioning, test speed, raw and calculated results, and any deviations from the method.

Typical use and users

Used by materials testing laboratories, foam and plastics manufacturers, product development and R&D teams, quality-control departments and certification bodies to characterize compression performance of rigid foam products (insulation, structural foam cores, packaging materials, specialty rigid cellular plastics) and to verify compliance with product specifications.

Related standards

ISO 844:2007 (previous edition), ISO 844:2021 (revised edition replacing the 2014 text), related cellular-materials test standards such as ISO 3386 (compression tests for flexible cellular materials), ISO 1856 (compression set for flexible cellular materials), ISO 1922 (shear properties of rigid cellular plastics) and relevant national/adopted EN or DIN versions (e.g., DIN EN ISO 844).

Keywords

rigid cellular plastics, rigid foam, compression test, compressive strength, compressive modulus, compression stress at 10%, foam testing, ISO 844, DIN EN ISO, STB adoption

FAQ

Q: What is this standard?

A: It is the national/adopted listing (STB DIN EN ISO 844 E 2014-02) of the international standard ISO 844:2014 that specifies test methods for determining compression properties of rigid cellular plastics.

Q: What does it cover?

A: It covers specimen preparation and conditioning, two alternative test procedures (crosshead motion and direct strain measurement), apparatus requirements, test speeds, calculation of compressive strength, compressive stress at 10 % relative deformation and compressive modulus, and reporting formats.

Q: Who typically uses it?

A: Materials testing laboratories, foam manufacturers, product R&D and quality-control teams, certification bodies and standards users who need to measure and document compression performance of rigid foam products.

Q: Is it current or superseded?

A: The 2014 edition has been superseded at the international level by ISO 844:2021. Depending on national cataloging, the 2014 adopted document may still appear in lists (STB/DIN/EN references), but users should refer to the 2021 edition for the current international requirements.

Q: Is it part of a series?

A: Yes — ISO 844 is part of the family of standards for cellular materials (ICS 83.100). Related parts and complementary standards cover properties such as tensile and shear (ISO 1926, ISO 1922), compression for flexible foams (ISO 3386), compression set (ISO 1856) and other test methods for cellular polymers.

Q: What are the key keywords?

A: rigid cellular plastics, rigid foam, compression properties, compressive strength, compressive modulus, test procedure A, test procedure B, ISO 844, DIN EN ISO, STB.