Rubber Testing Services
Rubber testing is the measurement of an elastomer’s physical, environmental, and chemical properties against recognized standards, most often ASTM. It is how a compound is proven to meet its specification before production, how a failing part is diagnosed, and how an unknown material is characterized so it can be matched or replaced.
Wayne Rubber manages rubber testing programs for compound qualification, specification compliance, incoming material verification, and failure analysis. Testing is performed to ASTM, ISO, MIL, and SAE methods, with results documented for your quality system. Send us a part, a compound, or a specification, and we will define and run the right test program.
When You Need Rubber Testing
Prove a Compound Meets Spec
Verify that a new or reformulated compound hits its hardness, tensile, compression set, and aging targets before it is released to production.
Confirm an ASTM D2000 Callout
Demonstrate that a material satisfies the type, class, hardness, tensile, and suffix requirements called out on the drawing.
Find Out Why a Part Failed
Determine whether a seal or gasket failed from the wrong material, a compound problem, chemical attack, heat aging, or a design issue.
Identify an Unknown Material
Characterize an existing or legacy part so its compound can be matched, replaced, or re-sourced when the original supply ends.
Verify Supplied Material
Check that received compound or parts match their certification, so lot-to-lot variation is caught before it reaches your line.
Confirm Service Life
Use accelerated aging and fluid immersion to estimate how a compound will behave after long exposure to heat, ozone, or media.
Physical Property Testing
These are the core mechanical measurements that define a rubber compound. Each is run to a published ASTM method so results are comparable across suppliers and lots.
| Test | What It Determines | Standard |
|---|---|---|
| Hardness (durometer) | Resistance to indentation, Shore A or Shore D | ASTM D2240 |
| Tensile strength | Force required to stretch a specimen to failure | ASTM D412 |
| Elongation at break | How far the material stretches before breaking | ASTM D412 |
| Tensile modulus | Stress at a defined elongation, a measure of stiffness | ASTM D412 |
| Compression set | Failure to recover thickness after sustained compression | ASTM D395 |
| Tear resistance | Resistance to a nick or cut propagating under tension | ASTM D624 |
| Abrasion resistance | Volume loss under a controlled abrasive load | ASTM D5963 |
| Resilience (rebound) | Energy returned after impact, the inverse of damping | ASTM D2632 |
| Specific gravity | Compound density, also a batch consistency check | ASTM D297 |
For a plain-language explanation of what each property means for part performance, see our guide to the physical properties of rubber.
Environmental, Aging and Chemical Testing
Mechanical numbers on a fresh specimen only describe day one. Environmental testing shows how a compound behaves after exposure to the conditions it will actually see.
Heat Aging
Specimens are held at elevated temperature for a defined period, then re-tested for hardness, tensile strength, and elongation. The change in those values predicts how a part will harden or embrittle over service life, which is the usual failure mode for seals in hot environments.
Fluid Immersion and Compatibility
Specimens are immersed in the service fluid at temperature, then measured for volume swell, hardness change, and property loss. This is the definitive answer to whether a compound survives a given oil, fuel, coolant, or chemical. For preliminary screening before testing, use our chemical resistance and material selection guide.
Ozone and Weathering
Strained specimens are exposed to controlled ozone concentration and inspected for surface cracking. This separates materials suitable for outdoor and high-ozone service, such as EPDM, from those that are not, such as standard nitrile.
Low Temperature Performance
Brittleness and retraction testing establish the cold limit at which a compound stiffens or fractures, which matters for outdoor, refrigeration, and cold-climate applications.
Compound and Cure Verification
Beyond finished-part properties, compound-level testing confirms that a mix behaves correctly before it is ever molded. Rheometer cure curves establish scorch time, cure rate, and optimum cure state, while Mooney viscosity confirms processing behavior and batch-to-batch consistency. These measurements are how a formulation is proven repeatable, and they feed directly into custom rubber formulation and rubber compounding work.
How a Testing Program Works
Define the Question
We start from what you need to prove: compliance to a callout, the cause of a failure, the identity of an unknown compound, or qualification of a new material. The question determines the test plan.
Build the Test Plan
We select the applicable methods and conditions, including temperatures, fluids, and durations, and confirm the plan with you before anything runs.
Prepare Specimens
Test specimens are prepared to the geometry each method requires, whether from molded slabs, supplied compound, or the finished part in question.
Run the Tests
Testing is carried out to the applicable ASTM, ISO, MIL, or SAE method so results are traceable and comparable.
Report and Interpret
You receive documented results plus interpretation: what the numbers mean, whether the material passes, and if not, what to change in the compound or the design.
Frequently Asked Questions
What is rubber testing?
Rubber testing measures an elastomer’s physical, environmental, and chemical properties against published standards such as ASTM. It is used to qualify compounds before production, confirm compliance with a specification, verify incoming material, and diagnose why a part failed.
Which ASTM tests are used for rubber?
The core methods are ASTM D2240 for hardness, D412 for tensile strength, elongation, and modulus, D395 for compression set, D624 for tear resistance, D5963 for abrasion, D2632 for resilience, and D297 for specific gravity. Aging, fluid immersion, and ozone tests supplement these.
Can you identify an unknown rubber compound?
Yes. A legacy or unmarked part can be characterized through physical property and analytical testing to establish its polymer family and key properties. That characterization is the basis for matching or replacing a compound when the original supply ends.
What does compression set testing tell you?
Compression set, measured to ASTM D395, shows how much of its original thickness a compressed rubber part fails to recover. It is the key predictor of whether a seal or gasket will keep holding sealing force over time, rather than relaxing and leaking.
How do I confirm a compound meets an ASTM D2000 callout?
A D2000 callout defines required type, class, hardness, tensile, and suffix properties. Confirming it means running each required test and comparing results to the limits in the callout. Send us the callout and we will build the matching test plan.
Can testing determine why a seal failed?
Usually, yes. Comparing a failed part against an unused one, and against the specification, distinguishes among wrong material selection, compound or cure problems, chemical attack, heat aging, and design or installation issues. The finding determines the fix.
Send Us a Part, a Compound, or a Callout
Tell us what you need to prove and we will define the test plan, run it to the applicable standards, and report results with interpretation you can act on. Testing supports our formulation, compounding, and molding programs, or stands alone.
Request a Testing Quote