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Silicone Potting Cure Inhibition: Causes and Prevention (B2B Technical FAQ)

2026-10-13

Latest company news about Silicone Potting Cure Inhibition: Causes and Prevention (B2B Technical FAQ)

What Is Cure Inhibition?

Addition-cure (platinum) silicone can fail to cure, remain tacky or stay soft when it contacts certain substances. This is known as cure inhibition or "poisoning". Understanding the causes helps manufacturers avoid a common and costly problem.

Common Causes of Cure Inhibition

  • Organotin and tin-containing silicone rubbers;
  • Sulphur, polysulphides or sulphur-containing articles;
  • Amines, polyurethane rubber or ammonia-containing items;
  • Phosphorus compounds;
  • Organic acids and acidic substances;
  • Solder-flux residues;
  • Condensation-cure (acetoxy) silicone, epoxy and polyurethane in contact.

How to Prevent It

  1. Clean all masters, tools and containers before use;
  2. Never mix or contact with tin-cure silicone;
  3. Avoid latex gloves — use nitrile gloves;
  4. Test colourants or fillers before production;
  5. Use fresh, correctly stored components.

Frequently Asked Questions

Why is my silicone still sticky? Cure inhibition from a contaminant is a common cause; check contact materials.

Does heat fix cure inhibition? No — curing is chemically blocked, so the contaminant must be removed.

Which contaminants most often cause problems? Tin-cure silicone, sulphur, amines and solder flux.

Conclusion

Preventing silicone cure inhibition is about cleanliness and material compatibility. With clean tooling and correct handling, addition-cure potting compounds cure reliably. Shenzhen Hanast New Materials supports partners with application guidance.

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