Overview
ISO 8013:2019 - Rubber, vulcanized - Determination of creep in compression or shear - specifies a laboratory method to measure creep behavior of vulcanized rubber under continuous compressive or shear loading. The standard applies to continuous (not intermittent) deformation and defines the test setup, specimen preparation, measurement accuracy and the calculations used to express results such as creep increment, creep index, and compliance increment. ISO 8013:2019 is the fourth edition and includes apparatus, calibration and reporting requirements for reproducible creep testing.
Key topics and technical requirements
- Scope & limitations
- Tests are for continuously applied compressive or shear forces; not for intermittent deformation.
- Terminology
- Defines key metrics: creep increment, creep index, compliance increment (ratios of deformation or strain to initial thickness or stress).
- Apparatus
- Thickness-measuring device complying with ISO 23529; measuring accuracy to 0.1 mm and contact foot pressure ~ (22 ± 5) kPa.
- Compression device: two parallel flat steel plates (surface finish ≤ 0.2 µm), friction-free movement, force maintained to within 0.1%.
- Shear device: central plate movement measured to ±0.01 mm, force maintained to within 0.1%.
- Temperature-controlled chamber for elevated-temperature tests (construction per ISO 23529).
- Timer and calibration equipment (calibration schedule provided in Annex B).
- Specimens & conditioning
- Test-piece geometries and numbers specified separately for compression and shear; mechanical conditioning and time-lapse after vulcanization are controlled.
- Test procedure & calculations
- Procedures for applying constant forces with negligible overshoot; duration guidance; formulas for creep increment/index and expression of results.
- Documentation
- Required content for the test report and annexes with force values for different hardnesses and calibration guidance.
Applications & users
- Practical for manufacturers, QC laboratories and R&D working with vulcanized rubber components where long-term deformation matters:
- Bearings, mountings, vibration isolators, seals and structural elastomer components supporting constant loads.
- Useful for product validation, life-prediction studies, material selection, and acceptance testing where creep in rubber affects performance.
Related standards
- ISO 1827 - Shear modulus and adhesion (quadruple-shear)
- ISO 4664-1 - Dynamic properties (general guidance)
- ISO 18899:2013 - Guide to calibration of test equipment
- ISO 23529 - Specimen preparation and conditioning
Keywords: ISO 8013:2019, creep in rubber, vulcanized rubber creep test, compression creep test, shear creep test, rubber testing standard, compliance increment.
