Description
Chem-Set™ 355 is a two-component, addition-cure silicone elastomer designed for electronic potting and encapsulation. Formulated for high-performance protection, this compound provides excellent resistance to moisture, vibration, chemicals, and thermal cycling. The cured elastomer remains soft, flexible, and easily repairable, making it ideal for long-term reliability in sensitive electrical and electronic assemblies.
Available in cartridges for convenient mixing and dispensing.
Key Features & Benefits
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100% Solids, No Solvents – VOC-free and environmentally safe.
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UL 94 V-0 Rated (File E205830) for superior flame resistance.
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Thermally Conductive (~0.68 W/m·K) for efficient heat dissipation.
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Low Modulus & High Elongation – Absorbs mechanical stress and vibration.
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Long Pot Life (100 minutes) for ease of application.
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Excellent Electrical Properties – High dielectric strength and volume resistivity.
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Repairable After Cure for serviceability and rework.
Typical Applications
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Potting and encapsulation of printed circuit boards (PCBs)
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Automotive electronics (ABS control units, sensors, ECUs)
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LED drivers and lighting modules
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Power supplies, transformers, and relays
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General electronic insulation and vibration damping
Technical Specifications
| Property | Test Method | Value |
|---|---|---|
| Mix Ratio (by weight) | 1:1 | |
| Work Life @ 25°C | 100 minutes | |
| Cure Schedule | 15 min @ 150°C or 24 hrs @ 23°C | |
| Viscosity (A/B) | 6,000 cP each | |
| Specific Gravity (A/B) | 1.63 | |
| Hardness (Shore A) | ASTM D2240 | 45 |
| Tensile Strength | ISO 37 | 250 psi (1.72 N/mm²) |
| Elongation at Break | ISO 37 | 240% |
| Tear Resistance | BS ISO 34-1 | 45 ppi (7.8 N/mm) |
| Thermal Conductivity | ~0.68 W/m·K | |
| Operating Temperature Range | -55°C to +240°C | |
| Dielectric Constant (1000Hz) | ASTM D-150 | 3.08 |
| Dissipation Factor | ASTM D-150 | 0.009 |
| Volume Resistivity | ASTM D-257 | 4.02 × 10¹⁴ Ω·cm |
| Comparative Tracking Index (CTI) | 600 volts |
Compliance & Certifications
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UL 94 V-0 Flame Rating, File No. E205830
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RoHS compliant
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REACH compliant
Compatible Substrates
Adheres well to:
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Ceramics
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Metals
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Plastics (ABS, polycarbonate, nylon)
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Electronic components and assemblies
Packaging & Ordering
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50 mL cartridge (includes static mixer)
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Also available in bulk kits upon request.
For pricing, samples, or technical support, contact Chemical Concepts at 800-220-1966 or chemical-concepts.com.
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