Glass curtain wall sealing strip

The most critical materials are EPDM (Ethylene Propylene Diene Monomer) and Silicone. EPDM is preferred for its excellent weather resistance, ozone resistance, and heat stability, making it ideal for outdoor structural use. Silicone is favored for its superior flexibility in extreme temperatures and UV stability. Ensure the material has a Shore A Hardness of 60-70 to balance compression and sealing effectiveness.

Buyers must ensure products meet ASTM C864 (Standard Specification for Dense Elastomeric Compression Seal Gaskets) or ISO 3934. For fire safety, look for UL 94V-0 or EN 13501-1 ratings. If the project is in the US, AAMA 701/702 compliance is essential to guarantee the strip can withstand high wind pressure and water penetration.

Focus on the Compression Set Resistance; a high-quality strip should recover its shape after long-term pressure to prevent air leaks. Request tensile strength tests (minimum 10MPa) and elongation at break (minimum 250%) reports. For curtain walls, the UV aging test (ISO 4892-2) is vital to ensure the strip won't crack or become brittle within 10-15 years.

Sealing strips are used in unitized curtain walls, stick systems, and point-supported glass. The design must match the aluminum profile groove dimensions perfectly. For high-rise buildings, choose multi-cavity structures which provide better sound insulation (STC rating) and thermal break performance to reduce building energy consumption.

Always request a Pre-Shipment Inspection (PSI) by a third party like SGS or Intertek. Specifically, ask for a dimensional tolerance check using digital calipers against your CAD drawings. Since these are often customized extrusions, confirming the mold accuracy with a small sample run (5-10 meters) before mass production is a mandatory risk-reduction step.

Focus on Total Cost of Ownership (TCO) rather than just the price per meter. Negotiate for free mold development if the order exceeds a certain volume (e.g., 5,000 meters). Use Made-in-China.com's Secured Trading services to ensure your payment is only released after you confirm the goods meet the agreed-upon technical specifications.

Sealing strips should be coiled on sturdy wooden or plastic reels to prevent permanent deformation or kinking during transit. Ensure the outer cartons are UV-protected and moisture-proof. For sea freight, specify FCL (Full Container Load) if possible to avoid compression damage from other heavy cargo in a shared container.

Verify the HS Code (typically 4008.29 for non-cellular rubber profiles) to calculate accurate import duties. Ensure the supplier provides a Certificate of Origin (CO), which may grant you preferential tariff rates under specific trade agreements. Always align your contract with Incoterms 2020 (e.g., FOB or CIF) to clearly define the point of risk transfer.