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Test a degradable elastomer in separate stages: measure its baseline tensile behavior, measure permanent set after extension, evaluate fatigue if it will be stretched repeatedly, then repeat the relevant tests after a defined degradation exposure. These tests answer different questions; none alone proves biodegradation or predicts service life.
Choose tests for the property you need to measure
“Stretch,” “recovery,” and “durability” are not interchangeable results. Start by deciding whether you need tensile strength and elongation, the dimensional change left after release, resistance to repeated extension, or changes in those properties after environmental exposure.
| Question | Method to consider | What it measures | Boundary |
|---|---|---|---|
| How far does the rubber stretch, and at what stress? | ISO 37:2024 | Tensile stress-strain properties, including tensile strength and elongation at break. | Not a recovery or degradation test; use the full standard and applicable material specification. |
| How much set remains after extension or load? | ISO 2285:2019 | Tension set under constant elongation, and specified elongation, creep, and tension-set measurements under constant tensile load. | Its scope includes rubber hardness of 20–94 IRHD and relatively short loading periods. For low-creep needs or product design, ISO 8013 may be relevant. |
| How does it withstand repeated extension? | ASTM D4482-11(2021) | Comparative tensile-strain extension-cycling fatigue, with rupture as failure. | Does not provide an exact service-life correlation; results primarily estimate crack initiation and only approximately indicate crack propagation. |
| When does a degradable thin film become brittle? | ASTM D3826-18 | A degradation endpoint for polyethylene or polypropylene films and sheeting under 1.0 mm thick. | This is a plastics method, not an elastomer method, and is not intended to measure degradation rate. |
ISO 37:2024 is edition 7, published in May 2024. ISO 2285:2019 is edition 8, published in July 2019 and confirmed current in 2024. ASTM lists D4482-11(2021) as active, last updated July 1, 2021. Check the publishers’ pages for status before specifying a method.
Define the material and test conditions first
“Degradable elastomer” does not identify a single chemistry or exposure protocol. A meaningful comparison depends on the material, specimen, intended environment, and use. Record these items before testing:
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- Elastomer family and grade, formulation or lot, if known.
- Specimen preparation route, geometry, and thickness.
- Conditioning temperature and humidity, preconditioning, and any other preparation required by the full method.
- For degradation exposure: medium, relevant environmental conditions, duration or sampling intervals, and handling after exposure.
- For mechanical testing: the governing standard, strain or load history, measurement timing, and equipment used.
Use a product or material specification when one applies. ASTM D3826’s scope notes that specification conditions take precedence for the plastics it covers; that reminder about controlling test conditions does not make D3826 applicable to elastomers.
Measure baseline tensile behavior
Use ISO 37:2024 as the standard starting point for tensile stress-strain behavior of vulcanized and thermoplastic rubber. It covers measurements including tensile strength and elongation at break, as well as stress or elongation at specified points. Follow the full standard for specimen form, test speed, conditioning, and calculations rather than selecting conditions from its summary page.
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Elongation at break tells you how much a specimen extended before breaking under the test. It does not tell you how much it returns after being stretched and released. Report tensile results as baseline mechanical properties, not as recovery.
Measure recovery as tension set
If the question is how much dimensional change remains after extension, consider the constant-elongation route in ISO 2285:2019. The method measures tension set after an extension is held and released. The full standard determines the applicable extension, hold conditions, release procedure, and the timing of the recovery measurement; those details should not be improvised or replaced with a single elongation-at-break value.
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ISO 2285 also covers specified elongation, creep, and tension set under constant tensile load. Select the route that matches whether the specimen is held at a fixed elongation or subjected to a fixed load.
Test repeated-extension fatigue when service involves cycling
For elastomers that will be repeatedly stretched, ASTM D4482-11(2021) provides a tensile-strain cycling fatigue method. Strain is relaxed to zero during part of the cycle, and rupture is the failure endpoint. Use it for comparative evaluation under controlled, consistently reported conditions—not as a direct conversion from cycle count to years or cycles in service.
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ASTM cautions that there is “no exact correlation between these test results and service.” It also describes fatigue data as primarily an estimate of crack initiation, with only an approximate measure of crack propagation. The standard warns that fatigue life can have a wide, non-normal distribution, so report specimen count and the spread of results; one specimen is not a reliable basis for ranking compounds.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Repeat tests after a defined degradation exposure
There is no universal exposure protocol for a material described only as a degradable elastomer. Select an exposure that represents the intended environment and state its medium and conditions. Test matched specimens at baseline and after specified exposure intervals, using the same specimen preparation, conditioning, geometry, and mechanical procedure at each point.
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- Prepare matched specimens for baseline and each exposure interval.
- Record the exposure medium, environmental conditions, and elapsed time for each group.
- Apply the chosen post-exposure conditioning consistently before mechanical testing.
- Repeat the relevant tensile, tension-set, and—if needed—fatigue measurements using the same method and conditions as at baseline.
- Present the measured outcomes against exposure condition or time, including replicates and result spread.
A change in tensile strength, elongation, set, or fatigue behavior shows a change in measured mechanical performance under the stated conditions. It does not by itself establish a degradation mechanism, biodegradability, compostability, environmental safety, or a real-world service lifetime. Those claims require evidence and methods suited to those questions.
Make comparisons defensible
When comparing compounds, keep specimen preparation, geometry, conditioning, strain history, and instrumentation consistent. Report the standard and edition, exposure and test conditions, number of specimens, central tendency, and dispersion. For extension fatigue in particular, the distribution may be broad, so show the spread instead of relying on a single result or an unqualified average.
SAE J1183_201702 is listed as a recommended practice that reviews factors affecting elastomer dynamic-stress behavior and provides laboratory fatigue-testing guidance. Verify the current SAE edition and its applicability before using it operationally.
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