Faqs / How is the compression set of the rubber being tested, and is the procedure consistent with industry standards such as ASTM D395?

How is the compression set of the rubber being tested, and is the procedure consistent with industry standards such as ASTM D395?

  1. Test Procedure Overview The compression set of rubber is tested to evaluate its ability to retain its elastic properties after prolonged compression and exposure to heat. This is crucial for understanding the material’s durability and performance in applications where it will be subjected to continuous stress or deformation.
  2. Industry Standards Compliance We ensure our testing procedures comply with the relevant industry standards, particularly ASTM D395 (Standard Test Methods for Rubber Property—Compression Set). This standard provides guidelines for conducting compression set tests under various conditions, including the following aspects:
    • ASTM D395:

      • Methods: Two main methods (Method A: Compression set under constant force, Method B: Compression set under constant deflection).
      • Conditions: Specified temperature ranges, typically 70°C to 150°C, and durations from 22 hours to 168 hours.
      • Measurement: Percentage of original deflection retained after recovery.
  1. Testing Procedure
    • Sample Preparation: Rubber samples are made to specified dimensions and pre-conditioned if required.
    • Compression: Samples are compressed to a predetermined deflection or force using calibrated testing fixtures and equipment.
    • Exposure: Compressed samples are subjected to a controlled environment, maintaining specific temperatures and durations based on the standard methods.
    • Recovery: After the exposure period, samples are allowed to recover at room temperature for a specified time.
    • Measurement: The final thickness of the samples is measured, and the compression set is calculated as a percentage of the original deflection.
  1. Equipment and Calibration
    • Fixtures: We use standardized fixtures for consistent sample compression.
    • Temperature Control: Environmental chambers or ovens with precise temperature control are used.
    • Measurement Tools: Calibrated micrometers or other precise measuring instruments ensure accurate deflection measurements.
  1. Documentation and Reporting
    • Data Logging: All test conditions, sample dimensions, and measurements are meticulously recorded.
    • Compliance Verification: Results are reviewed against acceptance criteria defined by ASTM D395 to ensure compliance.
    • Reporting: A detailed report is generated, including all relevant test data, calculations, and any deviations from standard procedures if applicable.
  1. Continuous Improvement We regularly review our testing procedures and equipment calibration processes to ensure they remain aligned with the latest revisions of ASTM D395. Any updates or changes in the standards are promptly integrated into our testing protocols.
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