DIN 53452 1977-04 PDF

Full title and description

STB DIN 53452:1977-04 — Testing of plastics; Flexural test (German title: Prüfung von Kunststoffen; Biegeversuch). The standard specifies a method for determining flexural properties of plastic specimens under bending (three-point loading) for use in material characterization and quality control.

Abstract

This 1977 DIN standard describes the procedure, specimen geometry and test conditions for a flexural (bending) test on plastics. It covers the measurement of flexural stress, flexural strain and flexural modulus using a three‑point bending arrangement and gives guidance to reduce shear effects by choosing appropriate span-to-thickness ratios. The method is intended primarily for quality control and comparative material characterization.

General information

• Status: Withdrawn / superseded (inactive).
• Publication date: April 1, 1977 (1977-04).
• Publisher: Deutsches Institut für Normung (DIN).
• ICS / categories: Plastics testing — ICS 83.080 (Plastics).
• Edition / version: Original DIN edition, 1977-04. (Later national/transposed editions exist; see related standards.)
• Number of pages: 5 (several catalogues list 5; some later listings show 6 pages for revised or editorial variants).

Scope

Specifies a laboratory method to determine flexural properties of unreinforced and reinforced plastics in the form of rectangular bars (molded or cut from sheets/plates). The procedure covers specimen preparation, support/spanning geometry, loading rate, measurement of load and deflection, and calculation of flexural stress, flexural strain and flexural modulus for use in quality control and material comparison. The method emphasizes minimizing shear effects by proper span-to-thickness selection.

Key topics and requirements

• Definition of specimen dimensions and conditioning prior to test.
• Three-point bending (simple support) test arrangement and span-to-thickness ratio recommendations to limit shear influence.
• Test speed (crosshead rate) selection based on specimen thickness and modulus considerations.
• Recording load and deflection to calculate flexural stress, flexural strain and flexural (tangent/ secant) modulus.
• Guidance on use for quality control and comparative material data; notes on ensuring comparable specimen preparation and test conditions across materials.

Typical use and users

Material testing laboratories, polymer manufacturers, quality control departments, research institutes and design engineers use the standard (or its successors) to evaluate stiffness, strength in bending and deformation behaviour of plastics for specification, acceptance testing and comparative assessment. Test houses performing mechanical characterization and suppliers providing datasheet values commonly apply the described flexural test methods.

Related standards

DIN 53452 (1977) has been superseded/transposed by later harmonized standards in the ISO/EN series for flexural testing of plastics — notably DIN EN ISO 178 (ISO 178) and subsequent national/adopted versions. Equivalent or comparable methods include ISO 178 and ASTM D790 (flexural properties of plastics). Related DIN items referenced for specific specimen types include DIN 53435 (Dynstat specimens) and other DIN plastics test methods.

Keywords

DIN 53452, flexural test, bending test, plastics testing, three-point bend, flexural modulus, flexural strength, specimen dimensions, DIN, ISO 178, ASTM D790.

FAQ

Q: What is this standard?

A: DIN 53452:1977-04 is a German national standard that defined a flexural (bending) test method for plastics (Prüfung von Kunststoffen; Biegeversuch).

Q: What does it cover?

A: It covers specimen preparation, three-point bending test setup (span/support/load application), test speed and the calculations for flexural stress, strain and modulus used for quality control and material characterization.

Q: Who typically uses it?

A: Testing laboratories, polymer producers, QC engineers, research organisations and standards bodies — essentially anyone needing standardized flexural property data for plastics.

Q: Is it current or superseded?

A: It is withdrawn/superseded. DIN 53452 (1977) has been replaced by the harmonized standard DIN EN ISO 178 (ISO 178) and later national/adopted editions; users generally apply the current EN/ISO version for up-to-date requirements.

Q: Is it part of a series?

A: Yes — it belongs to the family of plastics testing standards (DIN series) and has been folded into the EN/ISO series for plastics mechanical testing (ISO 178 and related ISO/EN test methods). Other DIN standards cover related specimen types and mechanical tests referenced alongside it.

Q: What are the key keywords?

A: Flexural test, bending test, plastics, flexural modulus, flexural strength, three-point bend, DIN 53452, ISO 178, specimen span, quality control.