COOLTHERM 6403
Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others
Main features
- 900 cP Mixed Viscosity
- 45-Minute 25 deg C Cure
- 50 to 120 deg C Service Range
Product Description
Circalok™ 6403 A SLW / B Urethane Encapsulant is a general-purpose, two-component urethane system for electrical and electronic encapsulation applications requiring fast cure and resistance to mechanical shock. The amber liquid components mix at a 22:10 resin-to-hardener ratio by weight and produce a mixed viscosity of 900 cP at 27 °C. The encapsulant can be poured or applied with automatic meter/mix/dispense equipment and cures in 30–45 minutes at 25 °C or 5–10 minutes at 100 °C. Once cured, it provides electrical insulation, moisture resistance, hydrolytic stability, and an operating temperature range of -50 to 120 °C.
Key features
- Low mixed viscosity: Provides a typical mixed viscosity of 900 cP at 27 °C for pouring or automated meter/mix/dispense application.
- Fast, heat-accelerated cure: Cures in 30–45 minutes at 25 °C or 5–10 minutes at 100 °C, with complete cure in 2–3 days at 25 °C.
- Electrical and environmental protection: The cured urethane provides electrical insulation, moisture resistance, and hydrolytic stability.
Applications / Suitable for
- General-purpose electrical and electronic encapsulation
- Encapsulated assemblies requiring fast cure and resistance to mechanical shock
- Parts and devices operating from -50 to 120 °C
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Physical Properties
Electrical Properties
Additional Information
As-supplied / before-processing properties
Typical properties of the separate components and mixed encapsulant before cure. Values are not intended for specification purposes.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Appearance | Amber liquid | — | 6403 A SLW resin, 6403 B hardener, and mixed material |
| Mix ratio | 22:10 | By weight | 6403 A SLW resin : 6403 B hardener |
| Viscosity — resin | 750 | cP | 6403 A SLW resin at 27 °C; test method not stated |
| Viscosity — hardener | 1,200 | cP | 6403 B hardener at 27 °C; test method not stated |
| Viscosity — mixed | 900 | cP | Mixed material at 27 °C; test method not stated |
| Specific gravity | 0.96 / 1.19 / 1.04 | — | Resin / hardener / mixed material; test conditions not stated |
| Gel time | 10–15 | minutes | Mixed material; test temperature and method not stated |
| Shelf life | 6 | months | Each component, from date of manufacture; stored at 25–40 °C in the original unopened container |
After-processing / final-state properties
Typical properties of Circalok 6403 A SLW / B after mixing and cure. Values are not intended for specification purposes.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Cure time | 30–45 | minutes | At 25 °C; complete cure in 2–3 days at 25 °C |
| Heat-accelerated cure time | 5–10 | minutes | At 100 °C after the material reaches the target temperature |
| Operating temperature range | -50 to 120 | °C | Parts and devices; retained-property data across the full range are not stated |
| Hardness | 80 | Shore A | Cured material; test method and cure condition not stated |
| Tensile strength | 1,935 | psi | Cured material; test method and cure condition not stated |
| Dielectric strength | 600 | V/mil | Cured material; specimen thickness and test method not stated |
| Volume resistivity | 1 × 1014 | Ω·cm | ASTM D257 at 25 °C |
| Dielectric constant | 3.6 | — | At 25 °C and 1 kHz |
