ASTM D6204 – Unvulcanized Rheological Properties Using Rotorless Shear Rheometers

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ASTM D6204 covers the use of a rotorless oscillating shear rheometer to measure the flow properties of raw rubber and unvulcanized rubber compounds that relate to factory processing.

The test measures viscoelastic properties of raw rubber and unvulcanized compounds that may relate to processing behavior in the factory. ASTM lists quality control, research and development, and the evaluation of differences between compounding materials as typical uses. Labs running the method confirm the cited edition, keep the rheometer calibrated, and report the test conditions with the results so data from different batches can be compared. The 2026 edition is the current ASTM D6204 designation.

Testing is done on a rotorless oscillating shear rheometer of the kind used for rubber process analysis. Our RPA Ultra rubber process analyzer supports testing to ASTM D6204. If you need help matching ASTM D6204 requirements to your parts or setup, contact our team.

Products With This Standard: ASTM D6204

Below you can find the products in our catalog that support this standard and the related testing workflow.

RPA Ultra – Rubber Process Analyzer

RPA Ultra – Rubber Process Analyzer

RPA Ultra is an advanced rubber process analyzer rheometer for measuring dynamic and static properties of raw rubber compounds and elastomers during processing and cure. Its closed-cavity moving die design, direct-drive deformation control, broad torque range, frequency capability up to 100 Hz, and high-pressure pneumatic sealing help labs characterize viscoelastic behavior, cure response, modulus, viscosity, tan δ, and processing performance.

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