Glass rubber strip

The most common materials are EPDM (Ethylene Propylene Diene Monomer), PVC, and Silicone. EPDM is the industry standard for outdoor use due to its superior UV resistance, ozone resistance, and weatherability, maintaining elasticity for over 10 years. Silicone is preferred for high-temperature environments or food-grade applications, while PVC is a cost-effective option for indoor furniture glass but has poorer aging resistance and may harden in cold temperatures.

Buyers must focus on Compression Set, Shore A Hardness, and Tensile Strength. For window and door sealing, a Shore A hardness of 60-70 is typical. Ensure the supplier provides a compression recovery rate of ≥80% to guarantee the strip returns to its original shape after the glass is installed, preventing air and water leakage over time.

For construction and automotive glass applications, products should meet ASTM C864 (Standard Specification for Dense Elastomeric Compression Seal Gaskets) or ISO 3934. If exporting to the EU, REACH and RoHS compliance is essential to ensure the rubber does not contain harmful plasticizers or heavy metals. For fire-rated glass, verify the material meets UL 94V-0 flame retardancy standards.

It is critical to request CAD drawings or cross-sectional diagrams from the supplier. The 'U-channel' width or 'T-slot' dimensions must match the glass thickness (e.g., 5mm, 8mm, 12mm) with a tolerance of ±0.2mm. A strip that is too tight will cause installation difficulty and potential glass breakage, while one that is too loose will fail in soundproofing and waterproofing.

Request a Polymer Content Test Report. Low-quality suppliers often mix recycled rubber scrap, which leads to 'blooming' (white powder on the surface) and premature cracking. On Made-in-China.com, prioritize Audited Suppliers who can provide raw material traceability certificates and third-party lab results from SGS or TUV.

For custom shapes, suppliers usually charge a Molding Fee (Tooling Cost) ranging from $150 to $500. Negotiate for a refund of the molding fee once the cumulative order volume reaches a certain threshold (e.g., 5,000 meters). For standard profiles, aim for a volume discount of 10-15% when ordering over 10,000 meters.

Rubber strips are prone to permanent deformation if compressed under heavy weight for long periods. Ensure the contract specifies spool-packing or high-strength corrugated box packaging rather than simple woven bags. For long-distance sea freight, verify that the container temperature will not exceed 60°C, as extreme heat can cause some rubber compounds to become tacky or lose their shape.

Utilize Secured Trading Services offered by Made-in-China.com to ensure payment is only released after the goods have passed inspection. Always conduct a Pre-Shipment Inspection (PSI) to check the meterage accuracy and Shore hardness before the final balance is paid, as returning defective rubber goods internationally is logistically difficult and costly.