Do not generalize one ratio to every system
WACKER's processing guide describes LSR component feeding, metering, mixing and injection. Use the processing data for the actual grade. When changing grade or adding pigment, confirm the ratio basis, addition limits and compatibility. Do not adjust A/B ratio informally to change hardness.
Review the complete material path
Check component lots, line identification, feed stability, metering verification and mixer condition. Actual output can differ from the setpoint; use a method suitable for the equipment and material. Local soft streaks justify investigating mixing and contamination but do not establish a root cause by appearance alone.
Verify restart separately
Record downtime, line temperature and material residence history, then follow supplier and equipment instructions for clearing or handling. Recheck restart first-off parts even when prestoppage production passed. Trained personnel must sample and clean under equipment procedures; do not dismantle a pressurized line informally.
Project review checklist
| Review layer | Required record | Insufficient evidence alone |
|---|---|---|
| Metering | Ratio basis and verification | Controller setpoint |
| Mixing | Mixer condition and sample location | One part's appearance |
| Restart | Time, temperature and first-off results | Prestoppage acceptance |
Illustrative project example
If early restart parts develop soft spots at an unchanged setpoint, retain early and later samples and review residence history. Adding more A or B without validation can hide rather than resolve the abnormality.
Frequently asked questions
Are all A/B systems mixed 1:1?
No. Follow the specific product instructions rather than applying a common LSR ratio to every two-component silicone.
Does final hardness prove accurate metering?
Hardness is one outcome, not a replacement for metering and mixing records.
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.
