1. Purpose
Determine the tear strength of vulcanized rubber or thermoplastic elastomer shoe soles.
2. Scope
Applies to all vulcanized rubber and thermoplastic elastomer shoe soles, plus similar materials.
3. References
- 3.1 ASTM D 624-00, Standard Test Method for Tear Strength of Conventional Vulcanized Rubber and Thermoplastic Elastomers
- 3.2 EN ISO 20872:2007, Footwear — Test methods for outsoles — Tear strength
- 3.3 SATRA TM65, Tear strength of outsoling and sheet materials
- 3.4 BS 9012, Method for the determination of tear strength of vulcanised rubbers
4. Terms and Definitions
- Tear strength: maximum force per unit thickness required to tear a test specimen, in N/mm
- Type A specimen: 90° angle specimen, no nick
- Type B specimen: 90° angle specimen, with nick
- Type C specimen: crescent specimen
- Type T specimen: trouser-leg specimen
- Type CP specimen: bar specimen
5. Equipment
- 5.1 Tensile testing machine, accuracy ±1 %, with two parallel grips that move at controlled speed
- 5.2 Sharp cutting knife or die set for each specimen type
- 5.3 Grinding machine for surface preparation
- 5.4 Thickness gauge, resolution 0.01 mm
- 5.5 Standard test environment: temperature (23 ± 2) ℃, relative humidity (50 ± 2) %
6. Specimen Sampling
Take five specimens longitudinally from each test sole.