Co-Extruded EPDM Sponge/Solid Sealing Profile
Challenge · Solution · Result
Window frame manufacturer required a co-extruded sponge+solid EPDM sealing profile with consistent cross-section ±0.2mm, stable Shore A 45 solid section, and UL94 HBF flame class for commercial building code compliance.
Developed co-extrusion die with sponge/solid dual-durometer outputs. Process controlled via laser micrometer inline measurement. Carbon black loading optimized for UL94 HBF compliance without degrading weather resistance.
Cross-section consistency ±0.15mm. Shore A 45 ± 2 on solid section. UL94 HBF certified. 18-month supply agreement at 200,000m/year.
Engineering Insights
DFM Analysis & Process Optimization
DFM Analysis: Die geometry computer-simulated to predict sponge expansion ratio — avoided 3 iterations of die modification typical in trial-and-error approaches.
Our engineers work from your CAD drawings before any tooling begins — identifying potential failure modes, proposing material alternatives, and validating gate/cooling layouts digitally. This eliminates costly mold revision cycles.
Empirical Test Data
Physical test results from production samples — available with every shipment on request.
| Property | Specification | Result |
|---|---|---|
| Cross-Section Tolerance | ±0.2mm | ±0.15mm |
| Shore A (Solid Section) | 45 ± 3 | 45 ± 2 |
| Compression Set (70h/70°C) | ≤ 30% | 22% |
| UL94 Flammability | HBF Class | PASS — HBF |
Get an Engineering Quote Within 24 Hours
Share your drawings, quantity and material requirements. Our team performs a complimentary DFM review before quoting.
- 📧 info@bluediamondindustry.comDirect Sales Response
- 📞 +86 532 86945929Emergency Project Support
- 💬 +86 1335636048124-Hour WhatsApp Service
- 🏢 T3Bld NO. 877 Lijiang West Road, Huangdao District, Qingdao, Shandong, China 266555