Soft Rubber Sealing Strip: field notes from the factory floor

If you spend enough time around doors, hoods and panels (guilty), you realize the humble sealing strip is doing the quiet heavy lifting—air, water, dust, noise. The Door Sealing Strip from Xingtai ShuoDing is a classic example: a rubber extrusion product available in EPDM, NBR, silicone, HNBR, TPE blends and more, cut to any size or thickness. Origin? Room 1410, No. 119 Zhongxing East Street, Xiangdu District, Xingtai City, Hebei Province, China. It’s a straightforward address for a surprisingly technical component.

Where a Soft Rubber Sealing Strip makes sense

• Exterior doors and windows (thermal and acoustic isolation, wind-driven rain)
• Automotive doors, trunks, sunroofs (NVH control, dust ingress)
• HVAC cabinets, electrical enclosures, telecom racks (IP sealing)
• Marine hatches, rail cars, cleanroom doors (ozone, salt, or chemical exposure)

Product specifications (typical, real-world use may vary)

Process flow and quality checks

Materials are batched and mixed (internal mixer) → cold-feed extrusion through die → microwave/hot-air vulcanization → cooling and haul-off → cut/coil → adhesive backing or metal carrier (optional) → dimensional and durometer checks → aging, ozone, and compression-set testing. Standards commonly referenced: ASTM D2000/SAE J200, ASTM D1149 (ozone), ASTM D2240 (hardness), ASTM D395 (compression set), and ISO 3302-1 for tolerances. Certifications like IATF 16949 for auto lines, plus RoHS and REACH compliance, are available on request.

Vendor snapshot (what buyers actually compare)

Customization that matters

Profiles: bulb, P, D, E, T, lip seals; co-extrusion (soft bulb + firm spine); PSA tape or slide-in carriers; corner molding. Many customers say a slightly softer bulb (by ~5 Shore A) improved closure forces without sacrificing IP rating. To be honest, dialing compression to 25–35% is the real trick.

Mini case study

A cabinet OEM swapped legacy PVC for a Soft Rubber Sealing Strip in EPDM (70A spine, 50A bulb). Result: door pull force dropped ≈18%, water ingress events fell to zero in spray tests (IP55 equivalent), and field noise reduction measured 4–6 dB. Feedback was almost boringly positive—no squeaks, no stick-slip.

Testing & compliance snapshot

• ASTM D2000 line callouts for auto projects; ISO 3302-1 tolerances on extrusions
• Ozone resistance (ASTM D1149), hardness (ASTM D2240), compression set (ASTM D395)
• Optional flammability grades per UL 94; low-VOC per ISO 12219 (where specified)
• RoHS and REACH compliant compounds available

Citations:

1. ASTM D2000: Classification System for Rubber Products in Automotive Applications
2. ISO 3302-1: Rubber — Tolerances for products — Part 1: Moulded, extruded and cut products
3. ASTM D1149: Rubber Deterioration—Surface Ozone Cracking
4. ASTM D395: Compression Set of Rubber
5. UL 94: Tests for Flammability of Plastic Materials
6. REACH Regulation (EC) No 1907/2006; RoHS Directive 2011/65/EU