Introduction
Rubber sealing strips are widely used in industries such as automotive, construction, household appliances, and containers, due to their excellent sealing, weather resistance, and durability. However, users often encounter a common issue: surface powdering of rubber sealing strips. What causes this? Is it normal aging or a sign of poor quality?
What Is Powdering of Rubber Sealing Strips?
Powdering refers to the chalky, dusty residue that appears on the surface of rubber sealing strips after a period of use or storage. It may look like white or gray powder, often mistaken as mold or surface contamination.
Why Does Powdering Happen?
Powdering is usually caused by one or more of the following reasons:
1. Material Degradation
- Long-term exposure to UV light, ozone, and oxygen leads to rubber surface oxidation and molecular breakdown.
- Common in EPDM, natural rubber, and PVC rubber seals.
2. Improper Formulation
- Use of excessive or low-quality fillers, such as calcium carbonate or talcum powder.
- Lack of proper anti-aging agents or poor-quality additives.
3. Manufacturing Issues
- Incomplete vulcanization or improper curing temperature/time.
- Poor extrusion or surface treatment processes.
4. Storage Conditions
- Exposure to sunlight, high temperature, or moisture during storage.
- Contact with chemicals, solvents, or plasticizers.
Does Powdering Mean the Product Is Defective?
Not always. Powdering may occur naturally during the aging process, especially in outdoor applications. However, early-stage powdering or severe chalking usually indicates a problem with material selection or production quality.
How to Prevent Rubber Sealing Strip Powdering?
✅ Use High-Quality Materials
- Prefer EPDM with high rubber content, or silicone rubber in high-temperature environments.
- Ensure proper ratio of anti-aging agents, UV stabilizers, and antioxidants.
✅ Control Manufacturing Parameters
- Ensure proper vulcanization (curing time, temperature).
- Conduct surface inspection and tensile strength testing.
✅ Improve Packaging and Storage
- Use UV-resistant film packaging, avoid long-term exposure to sunlight and moisture.
- Store in a cool, ventilated, dry place.
How OKIN Ensures Powder-Free Rubber Sealing Strips
At Okin, we understand the importance of material stability and long-term performance. Our rubber sealing strips are made with:
- Top-grade EPDM and NBR with high rubber content
- Precision vulcanization and strict quality control
- Tailored formulas for UV, ozone, and aging resistance
- Steel-reinforced profiles for long-lasting performance
Conclusion
Rubber sealing strip powdering is a common issue but not an unsolvable one. By choosing a professional manufacturer like OKIN, and understanding the science behind rubber aging, businesses can avoid unnecessary quality risks and product failures. Contact us today!