Description
ChemSet 355 is a 2-component, silicone elastomer system specially designed for electronic potting and encapsulation applications. It offers good protection against chemicals, environmental contamination, mechanical shock, vibration, and impact damage. It can be employed in areas where low flammability is a prerequisite. The cured elastomer can be repaired. The component parts have relatively low viscosities and are readily mixed either by hand or machine.
Key Features:
- 100% solids – no solvents
- Long pot life
- Low modulus
- Good elongation
- UL 94 V-0 rated, file number: QMFZ2.E205830
Applications:
Printed Circuit Boards (PCB), Electrical insulator, application cars e.g. encapsulation of ABS control unit
Properties:
| Uncured Product | ||
| Property | Test Method | Value |
| Cure Profile | 15 mins at 150°C | |
| Cure Type | Addition | |
| De-mould Time / Full Cure at 23°C/73°F | 24 hrs | |
| Density A | BS ISO 2781 | 1.63 |
| Density B | BS ISO 2781 | 1.63 |
| Mix Ratio By Weight | 1.1 | |
| Pot Life mins at 23°C/73°F | 100 mins | |
| Rheology | Liquid | |
| Viscosity Mixed | Brookfield | 6000 cP |
| Cured Product | ||
| Property | Test Method | Value |
| Color | Black/Grey | |
| Elongation at Break | ISO 37 | 240% |
| Hardness Shore A | ASTM D 2240-95 | 45 |
| Max Working Temp | 240 °C / 464 °F | |
| Min Working Temp | -55 °C / -67 °F | |
| Tear Resistance (N/mm) | BS ISO 34-1 | 7.8 N/mm / 45 ppi |
| Tensile Strength | ISO 37 | 1.72 N/mm2 / 249 psi |
| Thermal Conductivity | ~0.68 W/mK | |
| UL File No. | E205830 | |
| Electrical Properties | ||
| Property | Test Method | Value |
| Comparative Tracking Index (volts) | 600 volts | |
| Dielectric Constant | ASTM D-150 | 3.08 |
| Dielectric Strength (V/mil) | 500 V/mil | |
| Dissipation Factor | ASTM D-150 | 0.009 |
| Volume Resistivity (Ohms cm) | ASTM D-257 | 402000000000000 ohms cm |
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