If you're sourcing extruded rubber window seal suppliers for the US market, your top questions likely revolve around quality consistency, compliance with ASTM/UL standards, lead times, and the supplier's ability to handle custom profiles at scale. After 20 years in China's manufacturing export sector, I can tell you that the difference between a reliable partner and a commodity vendor comes down to three things: process control, material traceability, and the willingness to co-engineer solutions for your specific application—whether that's for commercial curtain walls, residential replacement windows, or marine-grade glazing systems.

At SHIJIAZHUANG TJJ TRADE CO., LTD., we've helped import managers and brand owners across North America, Europe, and South America navigate exactly these decisions.

TJJ Factory – Hebei Province, China

Material Traceability & Compliance

Every compound we use for extruded rubber window seals is sourced with full mill certificates. For US-bound orders, we offer EPDM, silicone, and neoprene formulations that meet ASTM C864 (standard specification for dense elastomeric compression seal gaskets) and UL 157 for flame retardancy. We also support RoHS, REACH, and California Proposition 65 compliance documentation.

Custom Profile Design & Tooling

Whether you need a dual-durometer bulb seal, a magnetic weatherstrip, or a complex EPDM gasket for a thermally broken aluminum frame, our in-house engineering team uses SolidWorks and Mastercam to develop tooling in 7–15 days. OEM/ODM is not an add-on; it's how we work. We've produced over 800 custom extrusion dies for clients in the US, Canada, and Australia.

Consistency at Scale

With a 15,000 m² facility and an experienced workforce (many with 10+ years at the company), we operate continuous vulcanization (CV) lines and hot-air curing tunnels that maintain dimensional tolerance within ±0.3 mm. Our QA lab tests durometer, tensile strength, compression set, and aging resistance every 2 hours during production runs.

• 20+ years of continuous foundry and extrusion manufacturing experience – our management team has overseen production for demanding clients in Europe, the Americas, and Africa.
• 200+ employees across two shifts, with dedicated QC and R&D departments.
• 15,000 m² (approx. 160,000 ft²) covered facility, including compounding, extrusion, vulcanization, and finishing lines.
• ISO 9001:2024 quality management system in place (certification available on request).
• Export experience: Regular shipments to the USA, Canada, UK, Germany, Brazil, and South Africa – we understand FOB, CIF, and DDP terms.

We are not a new player learning the trade. Our foundry and export business has been managed by the same family for two decades, and our commitment to quality has earned repeat business from clients who initially placed 500-meter trial orders and now place 50,000-meter annual contracts.

Continuous vulcanization extrusion line in operation

Residential Replacement Windows

EPDM bulb seals and fin seals for vinyl and aluminum windows – meeting ASTM C864 and AAMA 701/702 ratings.

Commercial Curtain Wall Systems

Custom silicone gaskets for unitized curtain walls – tested for air infiltration and water penetration per ASTM E283 and E331.

Marine & RV Glazing

Neoprene and EPDM seals with UV and ozone resistance – designed for high-vibration environments.

Industrial & Agricultural Buildings

Heavy-duty EPDM gaskets for insulated glass units and polycarbonate panels – available in custom lengths and adhesive backings.

David Hoffman

Procurement Manager, Great Lakes Window & Door (USA)

"We switched to TJJ after repeated consistency issues with our previous Asian supplier. TJJ's quality is solid—dimensional checks on the first 10,000 meters showed less than 0.5% deviation. Their team also helped us revise the bulb profile for better compression, which reduced our field failure rate by 12%."

Maria Santos

Brand Owner – EcoBuild Solutions (Spain/UK)

"As a smaller brand, finding extruded rubber window seal suppliers willing to work with our MOQ was tough. TJJ not only accepted 800 meters for our first custom profile, but they also gave us valuable design feedback to reduce material cost by 9% without compromising performance. Fast delivery and great communication."

James Chen

Sourcing Agent – Fenestration Asia (Singapore)

"I've been sourcing window seals for US clients for 12 years. TJJ is one of the few suppliers where the factory tour matches the marketing. Their QA lab is well-equipped, and the team actually understands ASTM standards without needing constant explanation. They're now on my approved vendor list."

Sarah Mitchell

Operations Director, Mitchell Contract Glazing (Canada)

"We needed a fire-rated EPDM seal for a high-rise project in Toronto. TJJ worked with us to develop a compound that met CAN/ULC S101 and ASTM E84. The certification paperwork was flawless, and the installation team reported no issues. Will order again."

Andrew Baker

Wholesale Distributor, Baker Supply (Australia)

"Lead time was the decisive factor for us—TJJ delivered 12,000 meters of custom silicone gasket in 24 days from tooling approval. That kind of speed helps us keep inventory lean without risking stockouts. Good people to work with."

MOQ

1,000 meters for custom profiles; 500 kg for standard profiles. Trial orders welcome.

Lead Time

15–20 days for standard profiles; 20–30 days for custom tooling + first production.

OEM/ODM

Full-service: profile design, prototyping, material compounding, packaging, and logistics.

Packaging

Bundled coil, wooden reels, or cut-to-length in cartons. Custom labeling per your specification.

After-Sales

Dimensional re-check report with each shipment; defect warranty per contract terms; technical support for installation questions.