TPV-ExxonMobil Santoprene 121-67
Sustaining extreme dynamic flex fatigue and resisting continuous solar ultraviolet degradation in outdoor automotive and architectural weather seals without structural cracking requires a highly resilient elastomer, which Celanese’s Santoprene 121-67W175 (formerly ExxonMobil) delivers. Boasting a density of 0.970 g/cm³ and a hardness of 72 Shore A, this specialized thermoplastic vulcanizate (TPV) is engineered for exceptional ozone resistance and outstanding thin-walled profile definition down to a 0.33mm radius. Jucheng Precision, under IATF 16949 and ISO 9001 quality systems, specializes in high-precision molding of Santoprene 121-67. Utilizing S136 stainless steel tooling and pressurized cooling channels, we control its anisotropic shrinkage (1.5%-2.5%) to deliver flash-free weatherstripping parts verified by Zeiss CMM.
Santoprene 121-67W175 UV Stability & Mechanical Resilience
Santoprene™ 121-67W175 is a soft, black-colored polyolefin-based thermoplastic vulcanizate (TPV) grade engineered by Celanese, designed to deliver exceptional environmental weatherability and flex fatigue resistance:
| Physical & Elastic Parameter | Santoprene 121-67W175 Metric | Molding & End-Use Advantage |
|---|---|---|
| Shore Hardness | 72 Shore A (ISO 868 / ISO 48-4) | Provides well-balanced elastic softness, ensuring high-compliance sealing surfaces and excellent haptic surface grip. |
| Compression Set | Compression Set 29% (at 70°C, 24h) | Exhibits superior, long-term elastic recovery under continuous mechanical seal loading, preventing dynamic leakage. |
| Subzero Flexing | Brittleness Temperature -59°C | Maintains exceptional mechanical toughness and elastic flexibility in extreme-freeze environments, avoiding brittle cracking. |
Outdoor and Dynamic Process Configurations for Weatherproof Santoprene 121-67
With its high-toughness linear matrix and enhanced UV protection package, Santoprene 121-67 processes reliably in intricate molds:
| Molding Process Category | Molding Compatibility & Process Setup Details |
|---|---|
| Thin-Profile Window Weatherstripping | Excellent. Fully optimized for high-performance architectural glass run channels, structural weather seals, and flexible window gaskets. |
| Automotive Exterior Trim | Excellent. High UV resistance and dynamic fatigue life are perfect for molding mudguard flaps, under-the-hood bellows, and exterior trims. |
| Dynamic Flex-Fatigue Joints | Good. Highly compliant with dynamic mechanical setups, providing long-term structural integrity against constant flex-cracking. |
Super-Thin Wall Melt Rheology & Flash Matrix
Molding an amorphous high-flow TPV like Santoprene 121-67W175 requires strict control of parting lines to prevent flashing, alongside conformal cooling channels:
Thin-Walled Flow & Gate Control (Low Viscosity Shear)
Because Santoprene 121-67W175 is engineered to fill ultra-thin sections (down to 0.33mm radius), it exhibits extreme non-Newtonian flow behavior under shear. Gates must be sized adequately and injection speeds profiled to prevent premature material freeze-off without causing dynamic gate blush.
Micron-Level Flash Prevention
At melt temperatures of 175°C–230°C, highly fluid TPV can easily seep into mold parting line gaps, causing flash. Jucheng’s tooling division uses 5-axis CNC machines to achieve micro-tolerances, keeping mold parting clearances strictly within 0.005mm on premium S136 stainless steel mold cavity blocks.
Dynamic Oil Mold Temp & Cooling Control
We maintain mold temperatures at 20°C–50°C (68°F to 122°F) using pressurized water chillers. Keeping tools cold is critical to freeze the soft elastomeric phase quickly, allowing for automatic, warp-free ejection. Conformal cooling loops are utilized to handle its high shrinkage (1.5%-2.5%).
Desiccant Drying & Volatiles Exhaust
We dry raw resin in desiccant hopper dryers at 80°C (176°F) for 3 hours. This eliminates surface splay and prevents weld-line micro-voids, keeping internal moisture strictly below 0.08%. Precise venting slots (0.015mm depth) are cut along parting lines to exhaust gas during high-melt runs.
Key Application Fields for TPV-ExxonMobil Santoprene 121-67
- Automotive Sealing & Weatherstripping (IATF 16949): High-precision glass run channels, windshield weather seals, door/window glass run segments, and under-the-hood dynamic bellows.
- Architectural Glazing & Construction: High-durability structural window gaskets, curtain wall expansion seals, building joints, and heavy-duty water-barrier profiles.
- Industrial plumbing & Fluid Systems: Potable water mixing valve seals, dynamic chemical pump diaphragms, flexible water seals, and high-pressure pipe gaskets.
Properties
| Density | 0.97 g/cm³ |
| Hardness (Shore A, 15s) | 72 - |
| Tensile Stress at 100% Elongation | 2.88 MPa |
| Tensile Stress at Break (Ultimate) | 6.83 MPa |
| Tensile Elongation at Break | 432 % |
| Tear Strength (Normal) | 24.2 kN/m |
| Compression Set (70°C, 24h) | 29 % |
| Low Temperature Brittleness | -59 °C |
| Dielectric Strength (3.17mm) | 19.6 kV/mm |
| Flammability Rating | UL 94 HB Class |
| Drying Temperature | 80 °C |
| Drying Time | 3 hr |
| Rear / Middle / Front Barrel Temperature | 180 / 200 / 220 °C |
| Mold Temperature Range | 20 - 50 °C |
| Linear Mold Shrinkage | 1.5 - 2.5 % |
| Maximum Part Size | 800 x 600 mm |
| Minimum Part Size | 1 x 1 mm |