ASTM D1229 is a standard test method used to evaluate how well vulcanized rubber recovers after being compressed and then released while still at low temperature. It is commonly used when seals, gaskets, and similar rubber components must maintain sealing force during cold exposure.
If you need help deciding whether this method fits your material, temperature range, or fixture setup, talk with our team about your application and the edition you must follow.
ASTM D1229: Standard Test Method for Rubber Property—Compression Set at Low Temperatures
This standard focuses on low-temperature recovery behavior after a controlled compression. It is often selected when room-temperature compression set results are not enough to represent real cold-service performance.
Because rubber response can be highly formulation- and temperature-dependent, the test temperature, conditioning approach, and measurement details in the cited edition can materially affect results and comparability.
Quick Definition
ASTM D1229 measures how much deformation remains (compression set) when a rubber specimen is compressed at room temperature, cooled to a low temperature, and then released and evaluated while still at the low temperature.
What This Standard Covers
ASTM D1229 covers vulcanized rubber that is compressed at room temperature and then subjected to low temperature in an air or carbon dioxide atmosphere, followed by evaluation of recovery when removed from the clamping device while still cold.
It is intended to show how low temperature can inhibit recovery after compressive deformation—an important behavior for many sealing and cushioning designs.
Why This Standard Matters in Testing
In cold environments, rubber can stiffen and recover more slowly (or incompletely) after compression. ASTM D1229 helps teams compare compounds or designs when the part must rebound and maintain contact pressure during low-temperature service.
Results are commonly used in material selection, design verification, supplier qualification, and troubleshooting when cold leakage or loss of sealing load is suspected.
Common Materials, Product Types, or Applications Covered
This method is most often applied to vulcanized rubber used in components where compression and recovery drive performance at low temperature.
Common product examples: Seals, gaskets, hydraulic cups, and other compressed-in-service elastomer parts where low-temperature rebound is critical.
Common Test or Verification Workflow
ASTM D1229 is typically run as a controlled compression-and-release sequence with cold conditioning.
Typical workflow elements: Compress the specimen at room temperature in a clamping device, condition at the specified low temperature (air or CO2 environment as applicable), remove/release the specimen while still at low temperature, and measure the recovered thickness/deflection to determine the remaining set.
Practical caution: Temperature uniformity and the timing of handling/measurement at low temperature can strongly influence repeatability. Matching the cited edition’s conditioning and measurement timing is important when comparing labs or suppliers.
Equipment Commonly Used for This Standard
ASTM D1229 is fixture- and temperature-control driven. The key is maintaining the required compression and low-temperature exposure, then making measurements while the specimen remains cold.
Common equipment: Compression set clamp/fixture sized for the specimen geometry; calibrated spacers or stops used to set compression; a low-temperature chamber or cooling setup capable of maintaining the required subnormal temperature; and a suitable thickness/deflection measurement tool appropriate to the method’s measurement step.
If you are selecting a cold chamber or compression set fixture for elastomer testing, you can request a detailed quote for a configuration matched to your temperature range, specimen size, and throughput.
How to Read This Designation or Revision
ASTM standards are often cited with a base designation and a revision or reapproval indicator. For example, ASTM’s listing for D1229 shows multiple versions (including a reapproved version indicated with an “R” and a two-digit year).
Revision sensitivity: Always confirm the exact cited version in your contract, drawing, or customer requirement, since details such as conditioning approach, temperatures, and reporting can vary by edition.
Related Standards, Methods, or Frameworks
Low-temperature rubber testing often depends on consistent temperature conditioning practices across methods.
Commonly paired reference: ASTM D3847 (practice for directions for achieving subnormal test temperatures) is explicitly intended to apply to multiple rubber test methods, including D1229.
Get help selecting equipment for ASTM D1229
For help aligning chamber capability, fixture sizing, and measurement approach to the ASTM D1229 edition you must follow, request pricing and we’ll scope an equipment path that fits your lab workflow.