TPV-ExxonMobil Santoprene 8211-75
Achieving vibrant, custom-colored soft-touch surfaces and complex dynamic gaskets without the processing limits of hygroscopic elastomers requires a premium material, which Celanese’s Santoprene 8211-75 (formerly ExxonMobil) delivers through its unreinforced, neutral-colored thermoplastic vulcanizate (TPV) matrix. Featuring a density of 0.930 g/cm³ and a hardness of 75 Shore A, this highly colorable grade offers an improved-flow, shear-dependent melt behavior designed for intricate multi-cavity tool filling. Jucheng Precision, under IATF 16949 and ISO 9001 quality systems, specializes in high-precision molding of Santoprene 8211-75. Utilizing 5-axis CNC-machined S136 stainless steel tooling, we control its anisotropic shrinkage (1.5%-2.5%) to deliver flash-free cosmetic grips and seals verified by Zeiss CMM.
Santoprene 8211-75 Mechanical & Processing Profile
Santoprene™ 8211-75 is a soft, colorable, non-hygroscopic thermoplastic vulcanizate (TPV) in the thermoplastic elastomer (TPE) family, designed to deliver exceptional melt processing and enhanced colorability under ASTM/ISO standards:
| Physical & Elastic Parameter | Santoprene 8211-75 Metric | Molding & End-Use Advantage |
|---|---|---|
| Shore Hardness | 75 Shore A (ASTM D2240) / 80 Shore A (ISO 868) | Provides highly versatile elastic softness and non-sticky haptic grip, ensuring dynamic comfort on handheld tool covers. |
| Elastic Extension | Tensile Elongation at Break 520% | High-molecular-weight polyolefin matrices provide superb stretch and seal flexibility, preventing structural tear. |
| Compression Set | Compression Set 36% (at 125°C, 70h) | Delivers outstanding elastic recovery under elevated thermal stress, preventing dynamic leaks in domestic water systems. |
Process & Aesthetic Configurations for Colorable Santoprene 8211-75
With outstanding melt flow and non-hygroscopic stability, Santoprene 8211-75 processes predictably inside precise molds:
| Molding Process Category | Molding Compatibility & Operational Details |
|---|---|
| Color-Coded Hand Tool Grips | Excellent. The primary process for Santoprene 8211-75. Fully optimized for high-volume dual-shot overmolding of vibrant colored screwdriver handles and plier grips. |
| Premium Writing Instrument Sleeves | Excellent. Highly colorable and low odor make it the leading choice for high-end pen grips, mechanical pencil sleeves, and drawing instrument buttons. |
| High-Flow Cosmetic Closures | Good. High melt flow index (MFR) supports rapid injection cycles for multi-cavity delicate cosmetic caps and container gaskets. |
TPV-ExxonMobil Santoprene 8211-75 Tooling & Color-Matching Guide
Molding a neutral, colorable non-hygroscopic elastomer like Santoprene 8211-75 requires strict control of parting lines to prevent flash, alongside color consistency controls:
Perfect Parting Line Clearances (Flash Control)
Because Santoprene 8211-75 has improved flow capabilities, the molten resin can seep easily into minor mold gaps, causing parting line 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.
Melt & Mold Temperature Control Matrix
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. Melt temperatures are controlled at 175°C–230°C (350°F to 450°F).
Desiccant Drying Protocol (Color Consistency)
While Santoprene 8211-75 is non-hygroscopic, pre-drying raw resin at 80°C (180°F) for 3 hours is recommended if color consistency is critical. This prevents moisture splay and ensures perfect batch-to-batch color saturation.
High Elastic Shrinkage Compensation
Like standard TPV, Santoprene 8211-75 exhibits high shrinkage (typically 1.5% to 2.5% depending on hardness and grade). Our tooling division scales mold cavities precisely to compensate for this shrinkage, ensuring exact dimensional results verified by Zeiss CMM.
Key Application Fields for TPV-ExxonMobil Santoprene 8211-75
- Consumer Hand Tools & Grips: Highly colorful, non-slip hand grips for screwdrivers, electric drill handles, toothbrush grips, kitchenware handles, and adjustable lever covers.
- Automotive Interiors & Seals (IATF 16949 Certified): Custom car floor mats, weatherstripping gaskets, window guide seals, soft-touch dashboard panels, and steering column boots.
- Writing Instruments & Personal Electronics: Luxury pen grips, mechanical pencil sleeves, protective phone bumper surrounds, and earbud dynamic sleeves.
Properties
| Density | 0.93 g/cm³ |
| Hardness (Shore A, 15s) | 75 - |
| Hardness (Shore A, 15s, ISO 868) | 80 - |
| Tensile Stress at 100% Elongation | 3.8 MPa |
| Tensile Strength at Break (Ultimate) | 7 MPa |
| Tensile Elongation at Break | 520 % |
| Tear Strength | 16 kN/m |
| Compression Set (125°C, 70h) | 36 % |
| Compression Set (70°C, 24h) | 27 % |
| Compression Set (23°C, 168h) | 22 % |
| Flammability Rating (1.1mm) | UL 94 HB Class |
| Drying Temperature | 80 °C |
| Drying Time | 3.0 hr |
| Rear / Middle / Front Barrel Temperature | 175 / 195 / 215 °C |
| Mold Temperature Range | 20 - 50 °C |
| Low Temperature Brittleness | -60.0 °C |
| Linear Mold Shrinkage | 1.5 - 2.5 % |
| Maximum Part Size | 800 x 600 mm |
| Minimum Part Size | 1 x 1 mm |