Confirm the report definitions
ML commonly denotes minimum torque; MH denotes maximum torque or a defined plateau torque within the analysis interval. t90 normally locates the time at 90% of the specified torque increase. Check the instrument algorithm and report definitions. A continuously rising curve and a clear plateau should not be compared without aligning the analysis.
Do not combine unlike instruments and conditions
ASTM D5289 addresses cure characteristics measured with rotorless curemeters. Its scope cautions that different instrument designs may produce different responses. Fix the instrument, temperature, method and specimen state for incoming-material trends. Establish appropriate correlation before combining equipment; do not attribute every difference to the compound.
Validate behavior in the mold
Real tooling and parts undergo heat transfer. Thick sections, inserts and geometry change process needs. Trial candidate conditions and inspect demolding, section condition, dimensions and function before setting an allowed window. Copying a coupon's t90 does not justify shortening every product cycle.
Project review checklist
| Curve information | Useful comparison | Not a direct conclusion |
|---|---|---|
| ML and initial region | Initial response under stated conditions | Filling behavior on every machine |
| MH and torque increase | Comparative cure response | All finished mechanical properties |
| t90 | Characteristic time under a defined algorithm | Demolding time of any product |
Illustrative project example
A shorter coupon t90 may coexist with internal problems in a thick metal-insert part. Review actual temperature and section condition. Curves screen possible directions; finished-part evidence confirms the process.
Frequently asked questions
Does higher MH always mean better quality?
No. Formulation, test conditions and target properties determine its meaning.
Does an acceptable t90 remove the need for post-curing?
No. Post-curing requirements follow the grade instructions, product properties and intended use.
Technical references
References explain methods and terminology. They do not establish certification, acceptance limits or measured performance for a Chengxin product. Confirm the applicable edition and project-specific method with the responsible laboratory.
Related product and project inquiry
Custom Shaped Silicone Parts · More Flash After Deepening Mold Vents: Defect Mapping First
For a custom part review, send the drawing, application, material or performance needs, key dimensions, quantity and target test conditions. Material, tooling and acceptance requirements are confirmed for each project.
