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High-transparency, platinum-cured silicone elastomer offering excellent optical clarity and UV stability.
Low compression set and superior resilience for long-term sealing and gasketing performance.
Excellent biocompatibility, compliant with USP Class VI and ISO 10993-5/-10 for medical device applications.
Easy-to-process liquid silicone rubber (LSR) with balanced viscosity for reliable injection molding and overmolding.
Outstanding thermal stability across –60 °C to +200 °C continuous service range.
Medical tubing and fluid handling components in diagnostic and drug delivery systems.
Seals, gaskets, and diaphragms for pharmaceutical processing equipment.
Overmolded grips and soft-touch elements on handheld medical devices.
Optically clear enclosures and light-diffusing components in healthcare instrumentation.
High-purity fluid path components requiring extractables and leachables control.
| 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 |
| Primary Applications | Medical devices, pharmaceutical equipment, health & wellness products |
| Key Features | USP Class VI compliant, ISO 10993 tested, low extractables, high clarity |
| Shore A Hardness (Cured) | 50 ± 3 |
| Curing Temperature Range | 110–180 °C (time-dependent) |
| Packaging | 20 kg pails (A/B ratio 1:1 by weight) |
Q1: What is the primary function of DOWSIL SE 5400 in silicone formulations?
A: DOWSIL SE 5400 is a high-performance silicone elastomer designed to enhance softness, elasticity, and surface lubricity in cured silicone rubber systems. It functions as a reactive modifier that integrates into the polymer network during vulcanization, improving tactile properties without compromising mechanical integrity.
Q2: Is DOWSIL SE 5400 compatible with both platinum-cure and peroxide-cure silicone systems?
A: Yes, DOWSIL SE 5400 demonstrates broad compatibility with common silicone curing chemistries, including addition-cure (platinum-catalyzed) and free-radical (peroxide-initiated) systems. Compatibility should be verified under actual processing conditions, particularly when high catalyst loadings or aggressive accelerators are used.
Q3: How does DOWSIL SE 5400 affect processing behavior, such as extrusion or molding?
A: The elastomer typically improves flow characteristics and reduces die swell in extrusion processes, while also supporting better mold release and reduced surface tack in compression and liquid injection molding. Its effect on viscosity depends on loading level and base polymer rheology.
Q4: Can DOWSIL SE 5400 be used in medical-grade silicone applications?
A: DOWSIL SE 5400 is formulated for use in high-purity silicone elastomer systems and is suitable for certain medical device applications where biocompatibility and extractables performance are critical—subject to full formulation validation and regulatory review per intended use and jurisdiction.
Q5: What storage conditions are recommended for optimal shelf life?
A: Store in original sealed containers at temperatures between 5 °C and 30 °C, away from direct sunlight and sources of heat or moisture. Prolonged exposure to elevated temperatures or humidity may affect viscosity and reactivity over time.
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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
