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Two-part, room-temperature curing silicone foam system engineered for controlled expansion and low outgassing.
Excellent radio frequency (RF) shielding effectiveness across 100 MHz to 10 GHz frequency range when applied with conductive fillers or integrated into shielded enclosures.
Low compression set and high resilience ensure long-term sealing integrity under repeated thermal cycling and mechanical stress.
UL 94 V-0 rated for flame resistance — meets stringent safety requirements in electronics and transportation applications.
Non-corrosive formulation compatible with sensitive electronic components, including copper, aluminum, and plated plastics.
EMI/RFI gasketing for 5G base station housings and mmWave antenna modules.
Thermal interface and vibration-damping seals in automotive ADAS radar enclosures.
Custom-molded RF-shielded cushioning for medical imaging device chassis.
Conformal gap-filling foam for server rack backplanes and high-speed compute modules.
Reusable, reworkable gasket material for aerospace avionics bay doors and EMI-sensitive payload housings.
| Chemical Type | Platinum-cured addition-cure silicone elastomer |
| Product Form | Two-component liquid kit (Part A: base; Part B: catalyst) |
| Appearance (Mixed) | Off-white viscous paste prior to foaming; expands to soft, closed-cell foam |
| Cure Schedule (RT) | Full cure at 23°C/50% RH: 7 days; accelerated cure: 60°C for 2 hours |
| Density (Cured Foam) | 0.25–0.35 g/cm³ (typical, dependent on mixing ratio and dispensing conditions) |
| Primary Applications | EMI/RFI shielding gaskets, environmental sealing, vibration damping, thermal gap filling |
| Key Features | Controlled expansion (1.5–2.5× volume), low ionic content, halogen-free |
| Regulatory Compliance | RoHS 2015/863/EU compliant; REACH SVHC candidate list free; ISO 10993-5 cytotoxicity tested |
| Common Compatible Systems | Suitability |
| Dow DOWSIL™ 3-2210 Adhesion Promoter | Highly Recommended – Enhances adhesion to low-surface-energy substrates (e.g., polypropylene, PTFE-coated metals) |
| Dow DOWSIL™ 224 Ultra-Soft Silicone Gel | Recommended – Compatible as secondary encapsulant or hybrid interface layer |
| Standard industrial meter-mix-dispense (MMD) equipment (e.g., Graco Reactor, Nordson BEVS) | Highly Recommended – Optimized for 1:1 volumetric ratio and low-viscosity foam dispensing |
| Conductive nickel-graphite loaded coatings (e.g., Dow DOWSIL™ 3-2030) | Suitable – Can be overcoated post-foam cure for enhanced RF shielding continuity |
Q1: What is the CAS Registry Number for Dow DOWSIL 3-8259 RF Silicone Foam Kit?
A: The kit does not have a single CAS number; individual components are assigned unique CAS numbers: Part A (Base) — CAS 68037-59-2; Part B (Catalyst) — CAS 68953-28-2. Full formulation details are available under NDA upon request.
Q2: What is the recommended mix ratio and pot life after mixing?
A: Mix Part A and Part B at a precise 1:1 volumetric ratio. Pot life is approximately 45–60 minutes at 23°C; reduced to ~20 minutes at 30°C. Always dispense within pot life to ensure consistent foam cell structure and RF performance.
Q3: How does DOWSIL 3-8259 compare to DOWSIL 3-2210 in terms of RF performance and processing?
A: DOWSIL 3-8259 is a foamable, expansion-enabled system optimized for lightweight, compressible EMI gaskets; DOWSIL 3-2210 is a non-expanding, ultra-soft gel for static interface applications. 3-8259 delivers superior volumetric RF shielding efficiency per gram but requires controlled dispensing and cure environment — unlike the ready-to-use gel format of 3-2210.
Q4: Are there extractables or leachables data available for use in medical or food-contact adjacent applications?
A: While not intended for direct food or implantable medical contact, DOWSIL 3-8259 demonstrates <0.1% total volatile condensables (TVC) per ASTM E595 and passes USP <87> cytotoxicity testing. Extractables profiling per ISO 10993-12 is available upon request for Class IIa/IIb medical device housing qualification.
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E-mail: wangxingqiang@ericwchem.com
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