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Soft, skin-friendly durometer (Shore A ~10–20) for enhanced tactile comfort and conformability.
Excellent thermal stability across –50 °C to +200 °C with minimal property degradation.
Low compression set (<20% @ 72 hrs, 150 °C), ensuring long-term sealing and rebound performance.
Good adhesion to common substrates including plastics, metals, and coated surfaces without primers.
UL 94 HB rated for flame resistance in non-flame-retardant configurations.
Medical device components requiring biocompatibility and soft-touch interfaces.
Consumer electronics seals and gaskets for wearables and portable devices.
Automotive interior trim overlays and soft-touch control surfaces.
Industrial enclosures and housings needing environmental sealing and vibration damping.
Personal care appliance grips and ergonomic overmolds.
| Chemical Type | High-consistency silicone elastomer blend (platinum-cured) |
| Product Form | Two-part (Part A + Part B), pre-compounded compound |
| Appearance | Opaque, uniform paste or dough-like consistency |
| Primary Applications | Overmolding, compression molding, transfer molding |
| Key Features | Softness, thermal resilience, low compression set, primerless adhesion |
| Benefits | Reduced assembly steps, improved end-user comfort, extended service life |
| Curing System | Platinum-based addition cure |
| Biocompatibility | Meets ISO 10993-5 (cytotoxicity) and USP Class VI requirements |
Q1: What is the primary function of DOWSIL 9040 in silicone elastomer formulations?
A: DOWSIL 9040 is a pre-blended silicone elastomer system designed to enhance processing efficiency and improve surface quality—such as reduced tackiness and improved release behavior—while maintaining good mechanical integrity in high-consistency rubber (HCR) and liquid silicone rubber (LSR) applications.
Q2: Is DOWSIL 9040 compatible with platinum-cured LSR systems?
A: Yes, DOWSIL 9040 is formulated for compatibility with platinum-catalyzed LSR systems. It does not contain known inhibitors or contaminants that would interfere with platinum cure kinetics under standard processing conditions.
Q3: How should DOWSIL 9040 be incorporated into a base polymer?
A: It is typically added during the mixing stage—either before or after filler incorporation—using standard dispersion equipment such as two-roll mills or internal mixers. Good dispersion is essential, and processing temperature should remain within the recommended range for the base elastomer to avoid premature structural changes.
Q4: Can DOWSIL 9040 help reduce post-molding surface defects like bloom or die swell?
A: Yes, it is commonly used to mitigate surface imperfections including bloom and excessive die swell by modifying polymer rheology and improving phase homogeneity—particularly in formulations containing high filler loadings or complex additive packages.
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
