Custom EPDM Extrusion Wholesale | OEM Supplier

If you are sourcing custom EPDM extrusion wholesale for a current project, your key variables are tooling cost amortization, material certification traceability, and extrusion tolerance control across long production runs. We produce these profiles daily for door sealing strips, cabinet seals, and WPC profiles — and the difference between a smooth procurement and a six-week revision cycle often comes down to how you send your CAD file.

Factory Capability Comparison: What to Verify Before Placing a PO

Not all extrusion lines handle the same durometer range or cross-section complexity. Before committing to a custom EPDM extrusion wholesale order, confirm these three parameters with any supplier:

Extrusion Line Configuration

• Single-screw vs. cold-feed: For EPDM compounds with 50–80 Shore A, cold-feed extruders provide better dimensional stability at speeds above 15 m/min.
• Microwave vs. hot-air vulcanization: Microwave tunnels reduce cure time by 40% for solid profiles; hot-air salt baths are preferred for sponge EPDM sections.
• In-line cutting vs. spooling: Profiles under 50 grams/meter spool continuously; heavier sections require cut-to-length with ±1 mm precision.

Material Properties Verification

We test every production batch against ASTM D573 (thermal aging) and ASTM D395 (compression set at 70°C/22h). Typical values for our EPDM compounds:

Property	Test Standard	Value Range
Shore A Hardness	ASTM D2240	55–80 ±5
Tensile Strength	ASTM D412	7–12 MPa
Elongation at Break	ASTM D412	300–550%
Compression Set	ASTM D395 Method B	<25%
Ozone Resistance	ASTM D1149	No cracking after 72h @ 50 pphm
Temperature Range	Internal	–40°C to +150°C
Flame Retardancy	UL 94	HB or V-0 (upon request)

In our Hunan factory experience, the most common overseas rejection is a Shore A drift of 3–5 points after production scale-up. We compensate by pre-qualifying every compound batch with a 50m pilot run before full production — a step many suppliers skip to save time.

MOQ, Tooling Cost, and Sample Lead Time

Minimum Order Quantities

For custom EPDM extrusion wholesale, MOQ depends on cross-section weight and die complexity:

• Simple profiles (solid rectangular, bulb seals): 500 meters
• Complex profiles (hollow chambers, metal carrier inserts): 1000 meters
• Sponge EPDM: 800 meters (due to extrusion speed limitations)

Tooling Cost and Ownership

• Steel extrusion dies: $350–$1,200 depending on cavity count and tolerance requirements (±0.15 mm standard, ±0.08 mm precision)
• Tooling ownership: You own the die after full payment. We store it free for 3 years.
• Multi-cavity dies: Reduce per-meter cost by 30% for annual volumes above 10,000 meters.

Sample Lead Time

• CAD review and quotation: 24 hours
• Sample production: 5–7 business days after die approval
• Sample shipping: DHL/UPS 3–5 days (door-to-door, we cover courier for orders over $5,000)

How to Send Proper CAD Drawings to Reduce Back-and-Forth

A poorly dimensioned drawing adds 2–3 email rounds and delays sample delivery. Follow this protocol:

Required File Formats

• Preferred: .STEP (.stp) or .IGES (.igs) for 3D geometry
• Acceptable: .DWG or .PDF with all cross-section dimensions in mm
• Avoid: .JPEG screenshots or hand sketches — we will request a re-draw at your cost

Critical Dimensions to Include

1. Overall width and height with tolerance callouts (e.g., 25.4 ±0.2 mm)
2. Wall thickness of hollow chambers (minimum 1.2 mm for solid EPDM, 2.0 mm for sponge)
3. Sealing lip angles and interference (typically 15–30° for door sealing strips)
4. Hardness specification and whether it applies to the entire profile or specific sections (e.g., 60 Shore A body, 70 Shore A clip)

Common Mistakes That Delay Projects

• Omitting the compression direction arrow on bulb seals
• Specifying ISO 3601 tolerances on non-circular profiles (use ISO 3302-1 instead)
• Not indicating post-extrusion operations (splicing, corner molding, adhesive backing)

Packing and Export Logistics for Overseas Buyers

Standard Packing Options

Packing Method	Application	Max Length
Coils on pallets	Continuous spooling profiles	200 m/coil, 4 coils/pallet
Wooden reels	Heavy profiles > 1 kg/m	500 m/reel
Cut-length bundles	Rigid sections (e.g., cabinet seals)	6 m/bundle, shrink-wrapped
Carton boxes	Small profiles with adhesive backing	50 m/box, 20 boxes/carton

Export Documentation

• Fumigation certificate: Required for wooden reels and pallets (ISPM 15 compliant)
• Material test report: Provided with every batch per ASTM D573 and ISO 1817 (fluid resistance)
• Customs HS Code: 4008.29 (vulcanized rubber, non-cellular) or 4008.11 (cellular rubber)
• Incoterms: FOB Shenzhen or CIF major ports (we handle container consolidation)

Frequently Asked Questions

What is your MOQ for a custom EPDM extrusion wholesale order?

For standard solid and sponge EPDM profiles, MOQ is 500 meters per die. If you require a shorter pilot run for testing, we offer 200-meter trial orders at 1.5× the unit price — tooling cost remains the same.

What is the typical lead time from PO to shipment?

8–12 business days for sample approval, 15–20 business days for production of 2,000–5,000 meters, and 25–30 business days for volumes above 10,000 meters. Rush orders (5-day production) carry a 20% surcharge.

What extrusion tolerance can you hold?

Standard tolerance per ISO 3302-1 class E2: ±0.30 mm for dimensions under 10 mm, ±0.50 mm for 10–30 mm, ±1.0% for above 30 mm. Precision class E1 (±0.15 mm) is available with a 15% tooling surcharge.

How do you pack profiles for ocean freight?

Solid profiles go on wooden reels or pallets with stretch wrap and edge protectors. Sponge profiles are packed in cartons with anti-crush inserts. We include desiccant packs for high-humidity routes. All wooden packing is heat-treated with ISPM 15 stamp.

Can I get a sample before placing a wholesale order?

Yes. Sample cost is the die price plus $50–$150 for material and cutting. We refund the full sample cost on the first production order above $3,000. Sample lead time is 5–7 business days after die approval.

Specification Table: Typical EPDM Compound for Custom Extrusion

Parameter	Value	Test Standard
Hardness	65 ±5 Shore A	ASTM D2240
Tensile Strength	9 MPa (min)	ASTM D412
Elongation at Break	400% (min)	ASTM D412
Compression Set (70°C/22h)	20% (max)	ASTM D395 Method B
Heat Aging (70°C/168h)	Hardness change ≤ ±5 pts	ASTM D573
Ozone Resistance (50 pphm/72h)	No cracks	ASTM D1149
Flame Retardancy	UL 94 HB	UL 94
Temperature Range	–40°C to +150°C	Internal
Fluid Resistance (IRM 903/70h)	Volume swell ≤ 20%	ISO 1817

Send your CAD drawing (.step or .dwg) to our engineering team for a 24-hour quote on your custom EPDM extrusion wholesale project.