ISO 2473-1972 PDF
Name in English:
St ISO 2473-1972
Name in Russian:
Ст ISO 2473-1972
Original standard ISO 2473-1972 in PDF full version. Additional info + preview on request
Full title and description
ISO 2473:1972 — "Ebonite — Determination of cross-breaking strength". Specifies a standardized method to measure the cross‑breaking (bending) strength of ebonite using a point load applied midway between two supports.
Abstract
This International Standard (first edition, 1972) defines specimen geometry, test apparatus and procedure, and the calculation used to report the cross‑breaking strength of ebonite from a three‑point bending test. The document is short (2 pages) and was published by the International Organization for Standardization.
General information
- Status: Withdrawn (no current active ISO revision).
- Publication date: 1972 (Edition 1, August 1972).
- Publisher: International Organization for Standardization (ISO).
- ICS / categories: 83.080.10 — Thermosetting materials (ebonite).
- Edition / version: Edition 1 (1972).
- Number of pages: 2.
Scope
Defines a method to determine the cross‑breaking strength of ebonite by bending a rectangular test piece on two supports with a centrally applied point load (three‑point bending). The standard specifies specimen shape and dimensions, number of test pieces, apparatus requirements and the calculation of the surface stress at failure.
Key topics and requirements
- Definition of "ebonite" and "cross‑breaking strength" as used for the test.
- Specimen dimensions: rectangular bar, minimum length 120 mm, width 15 ± 0.2 mm, thickness 6.3 ± 0.3 mm (tight tolerances on width and thickness).
- Number of specimens: three test pieces per determination.
- Apparatus and loading: testing machine with appropriate supports and midspan loading head; requirements to ensure reproducible bending and to calculate surface stress at failure.
- Notes on preparation and acceptance of test pieces (surface finish, dimensional tolerances, rejection of specimens with visible imperfections).
Typical use and users
Used by materials testing laboratories, manufacturers and quality control departments that work with ebonite (vulcanized hard rubber) and by standardization bodies referencing historical test methods. Typical applications include verification of mechanical strength for electrical insulating parts, hard rubber components and R&D where legacy ebonite test methods are relevant.
Related standards
Other ISO and national standards dealing with ebonite and mechanical testing (e.g., ISO 2474:1972 — Determination of crushing strength, and related polymer/plastics test standards). There are national/adopted equivalents (for example NEN ISO 2473:1980 was published as identical). Some national standards (e.g., certain GOSTs) reference ISO 2473 in their test method bibliographies. Note: ISO 2473 itself is withdrawn.
Keywords
ebonite; cross‑breaking strength; bending test; three‑point bending; mechanical properties; thermosetting materials; test specimen dimensions.
FAQ
Q: What is this standard?
A: ISO 2473:1972 is an International Standard entitled "Ebonite — Determination of cross‑breaking strength" that defines a three‑point bending test method for ebonite.
Q: What does it cover?
A: It covers specimen geometry, number of specimens, apparatus and procedure for measuring cross‑breaking (bending) strength of ebonite and the calculation used to report the result.
Q: Who typically uses it?
A: Materials testing laboratories, manufacturers and quality/inspection departments working with ebonite or historical test suites for hard vulcanized rubber. Standards committees and researchers referencing legacy test methods may also use it for comparison.
Q: Is it current or superseded?
A: ISO 2473:1972 has been withdrawn and is not an active ISO standard. Sources list it as withdrawn (historical, no active ISO replacement). Consult national standards bodies for current test methods if you need an active specification.
Q: Is it part of a series?
A: It belongs to the set of ISO standards addressing ebonite and related elastomeric/thermosetting material tests (other nearby numbers include ISO 2474:1972 and related mechanical test standards). Some national bodies published equivalents or referenced it in their own ebonite/rubber standards.
Q: What are the key keywords?
A: Ebonite; cross‑breaking strength; bending; three‑point load; test specimen dimensions; thermosetting materials.