MOQ & Flexibility

Standard MOQ for window kerf slot sash weatherstrip is 5,000 ft per SKU, with a mixed container option for first-time orders. We offer lower trial MOQs (1,000 ft) for new customers who need to validate fit and performance before scaling.

Lead Time

Production lead time: 15–25 days after deposit and drawing approval. For stock sizes and colors, we can ship within 10–15 days. Shipping from Tianjin port via FOB, CIF, or EXW as you prefer.

OEM / ODM Support

Full OEM/ODM design capability: custom extrusions, color matching, co-extruded fins, branded packaging, and custom kerf slot geometry. We collaborate with your engineering team to match your exact sash profile.

Payment Terms

T/T (30% deposit, 70% against copy of B/L), L/C at sight, or negotiable for established partnerships. We also accept payments via Alibaba Trade Assurance for smaller orders.

Packaging & Logistics

Standard export packaging: spools or coils wrapped in LDPE film, then in reinforced kraft paper, packed in carton boxes or on pallets as required. Custom labeling and barcode scanning for retail-ready fulfillment.

After-Sales & QC

We provide a quality inspection report with every shipment, including dimensional check, hardness test, and compression set data. Defective material accepted within 30 days of receipt — we replace or credit.

🏠 Residential Window Replacement

Wholesalers supplying retrofit sash kits use our weatherstrip to replace worn-out pile or fin seals. The dual-fin version compresses into standard 5/16 in. and 3/8 in. kerf slots, reducing air leakage by up to 35% compared to standard pile weatherstrip (based on ASTM E283 testing).

🏢 Commercial Storefront Systems

Brand owners specifying weatherstrip for aluminum storefront sash require UV resistance and low compression set. Our EPDM compound holds up under constant sash operation in high-traffic entry doors, tested to 100,000 cycles with no visible wear.

🏗️ New Construction vs. Renovation

For new construction, our OEM team can supply weatherstrip pre-cut and pre-bagged per window unit, reducing on-site labor. For renovation projects, we offer longer coils (100 ft+ ) for job-site cut-to-length applications, minimizing waste.

🌡️ Passive House & Energy Code Projects

With energy codes tightening across the US (IECC 2024/2026), our weatherstrip helps meet air infiltration requirements. The closed-cell structure delivers consistent sealing at low compression force, ideal for high-performance sash designs.

• 20+ years of foundry and metal component manufacturing — we understand precision fit and material consistency.
• ISO 9001 quality management system (available for review during audit). Our production lines follow standardized QC checkpoints at every stage.
• 150+ skilled workers and dedicated tooling engineers. We maintain our own extrusion and molding capability, giving us direct control over hardness, surface finish, and dimensional accuracy.
• Export experience to USA, South America, Europe, and Africa — we understand US construction standards and packaging requirements (e.g., ASTM testing, FOB/CIF terms).
• Full traceability: each batch of raw material is logged, and finished weatherstrip is labeled with production date and QC inspector ID.

QC inspection station — dimensional and hardness testing for every production batch.

David Chen

Import Manager, New York

"We tested weatherstrip samples from three Chinese factories. TJJ's kerf slot fit was the most consistent — every piece measured within 0.2 mm tolerance. We placed a 50,000 ft trial order and the lead time was 18 days. That kind of reliability keeps our inventory predictable."

Sarah Mitchell

Brand Owner, California

"Our brand sells high-end replacement sash kits, so the weatherstrip has to match our quality promise. TJJ developed a custom dual-fin profile for our 5/16 in. kerf slot. The color match was perfect, and the EPDM feels dense — no softening after 6 months in our test window."

Michael O'Brien

Wholesaler, Florida

"I was sourcing from a US distributor paying $0.52/ft. TJJ offered the same spec at $0.23/ft FOB. The first container arrived with full QC docs — every coil tagged and traceable. My margins improved by 18% without any quality complaints from my customers."

Thomas Wright

Sourcing Agent, Texas

"I evaluate 10+ Chinese suppliers annually for my clients. TJJ is one of the few that actually sends dimensional inspection data with the sample. Their weatherstrip extrusion is clean, no burrs, and the Shore A hardness was consistent across the entire sample length. They made my sourcing decision easy."

Jennifer Adams

Purchasing Manager, Illinois

"We source weatherstrip for 12 product lines. TJJ helped us consolidate from three suppliers into one. Their OEM team blended two color references to match our white and bronze profiles exactly. Shipping was consolidated, saving us 22% on logistics. We are now on our 4th container order."

What is the standard kerf slot size for sash weatherstrip?

Most US and Canadian residential sash windows use a kerf slot width of 3/8 in. (9.5 mm) or 5/16 in. (7.9 mm). Commercial aluminum storefront systems often use 5/8 in. (15.9 mm). We offer weatherstrip for all these dimensions, plus custom sizes for OEM programs.

Can you match an existing weatherstrip profile from a sample?

Yes — we have a reverse-engineering service. Send us a 12 in. sample piece (or detailed drawing), and our engineers will replicate the profile, including kerf fin geometry, hardness, and color. Tooling turnaround is typically 4 weeks.

What is the minimum order quantity for a custom profile?

For custom OEM profiles, MOQ starts at 10,000 ft per color and durometer. If you use standard tooling (common kerf sizes), trial orders as low as 1,000 ft are available. Please contact us with your specific profile and volume.

Do you provide third-party test reports for air infiltration?

We provide in-house QC data with each shipment. For third-party ASTM E283 air leakage testing, we can coordinate with a certified lab at an additional cost. Many of our customers use our internal data for their own validation process.