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High-transparency, platinum-cured liquid silicone rubber (LSR) with excellent optical clarity and UV stability.
Low compression set and outstanding resilience for long-term sealing and gasketing performance.
Excellent biocompatibility, compliant with ISO 10993-5 and USP Class VI for medical device applications.
Fast cure profile at elevated temperatures, enabling high-throughput injection molding processes.
Good adhesion to engineered thermoplastics and metals without primers in optimized bonding configurations.
Medical-grade wearable sensors and skin-contact patches requiring soft, hypoallergenic elastomers.
Seals and gaskets for diagnostic equipment housings exposed to repeated sterilization cycles.
Optical light guides and diffuser lenses in portable healthcare devices.
Soft-touch overmolded grips for surgical hand tools and patient interface components.
Microfluidic device encapsulation where dimensional stability and chemical inertness are critical.
| Chemical Type | Platinum-cured addition-cure liquid silicone rubber (LSR) |
| Product Form | Two-part liquid system (Part A: base; Part B: catalyst) |
| Appearance | Clear, low-viscosity liquid (Part A); colorless to pale yellow liquid (Part B) |
| Primary Applications | Medical devices, wearable electronics, optical components, precision seals |
| Key Features | Biocompatible, optically clear, fast-curing, low-compression-set elastomer |
| Benefits | Reduced cycle time in LSR molding, consistent part quality, regulatory-ready formulation |
| Cure Temperature Range | 110–160 °C (optimized at 130–150 °C) |
| Shelf Life (unopened, 25 °C) | 12 months from date of manufacture |
Q1: What is the primary function of DOWSIL EL-9140 DM in silicone elastomer formulations?
A: DOWSIL EL-9140 DM is a dimethyl-functional silicone elastomer designed to serve as a high-performance rheology modifier and softening agent. It enhances flexibility, improves surface smoothness, and contributes to low-modulus, skin-friendly tactile properties in cured silicone elastomers—particularly in medical-grade and personal care applications.
Q2: Is DOWSIL EL-9140 DM compatible with addition-cure (platinum-cure) silicone systems?
A: Yes, DOWSIL EL-9140 DM is fully compatible with addition-cure silicone elastomer systems. It does not contain functional groups that inhibit platinum catalysts and can be incorporated directly into base polymers without requiring pre-treatment or special handling.
Q3: How should DOWSIL EL-9140 DM be incorporated into a formulation?
A: It is typically added during the mixing stage under moderate shear—either before or after filler incorporation—depending on the desired dispersion level and final compound viscosity. Due to its low volatility and thermal stability, it remains effective throughout standard processing conditions including degassing and curing.
Q4: Does DOWSIL EL-9140 DM affect the cure kinetics or final mechanical properties of the elastomer?
A: It generally has minimal impact on cure speed when used at recommended levels, though very high loadings may slightly extend gel time. It consistently reduces modulus and hardness while improving elongation and resilience—making it especially valuable for applications requiring gentle compression set resistance and conformability.
Q5: Can DOWSIL EL-9140 DM be used in products intended for repeated skin contact?
A: Yes—this material is formulated to support biocompatibility in finished elastomer systems. While final regulatory compliance depends on the full formulation and processing, DOWSIL EL-9140 DM is commonly selected for medical devices, wearable sensors, and cosmetic applicators where skin compatibility and low irritation potential are critical.
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