Name: ISO 812:2017 — Rubber, vulcanized or thermoplastic — Determination of low-temperature brittleness
SKU: ISO 812:2017
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Abstract

Overview

ISO 812:2017 specifies a standardized method for determining the low-temperature brittleness of vulcanized or thermoplastic rubber. The standard defines the lowest temperature at which rubber test pieces do not fracture under a specified impact and the temperature at which 50% of test pieces fail under the same conditions. ISO 812 is intended for predicting rubber behavior in low-temperature applications when deformation and impact conditions are similar to the test method.

Key Topics and Requirements

Three test procedures
- Procedure A - determination of the brittleness temperature (lowest non-failing temperature).
- Procedure B - determination of the 50% brittleness temperature (temperature giving half failure rate).
- Procedure C - impact at a specified temperature (used for classification and specification).
Definitions
- Brittleness temperature, 50% brittleness temperature, testing speed, and failure (visible crack, fissure, hole, or complete separation).
Apparatus and test conditions
- Impact speed: 2.0 m/s ± 0.2 m/s at impact; striking energy normally ≥ 3.0 J per test piece.
- Striker geometry and clearances are specified (e.g., striking edge radius ~1.6 mm).
- Test-piece types and dimensions (type A strip: 26–40 mm long, 6 mm ±1 mm wide, 2.0 mm ±0.2 mm thick; type B shape provided).
- Heat-transfer medium requirements (liquids or gases that remain fluid and are chemically inert at test temperatures); examples range from silicone fluids to methylcyclohexane cooled with liquid nitrogen for very low temperatures.
Test procedure details
- Conditioning times (e.g., 5 min in liquid medium), immersion depth, clamping torque guidance, and stepwise temperature sequences (10 °C gross steps then 2 °C refinement).
- Calculation or graphical methods for 50% brittleness temperature.
Calibration and precision
- Equipment calibration schedule (Annex B) and speed calibration methods (Annex A).
- Limitations: results depend on impact rate and test conditions and may not equal the lowest usable service temperature.

Applications and Who Uses It

Quality control and acceptance testing for manufacturers of vulcanized rubber and thermoplastic rubber products (seals, hoses, gaskets, automotive components, cold‑climate elastomers).
Material selection and specification by engineers and procurement specialists to ensure rubber parts resist low-temperature embrittlement under specified impact conditions.
Test laboratories performing standardized rubber testing and certification.
Research and development teams evaluating formulations, plasticizer effects, or crystallization behavior at low temperatures.

Related Standards

ISO 4646 - similar test for rubber-coated fabrics.
ISO 23529 - preparing and conditioning test pieces for physical test methods.
ISO 18899 - guide to calibration of test equipment.

Keywords: ISO 812, low-temperature brittleness, rubber testing, brittleness temperature, 50% brittleness temperature, vulcanized rubber, thermoplastic rubber, impact tester, test pieces.

ISO 812:2017 PDF

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Abstract

Overview

Key Topics and Requirements

Applications and Who Uses It

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