STYCAST 2651
Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others
Main features
- Catalyst-Selectable Cure Profiles
- 45-Minute CAT 9 Work Life
- NASA Outgassing Performance
Product Description
LOCTITE STYCAST 2651 Epoxy Encapsulant is a black, filled general-purpose dielectric epoxy resin for potting and encapsulation with a choice of compatible catalysts. With CAT 9, the system mixes 100:7 by weight, reaches a typical mixed viscosity of 32,000 cP, and provides a 45-minute working time at 25 deg C. The cured material combines electrical insulation, 0.66 W/(m K) thermal conductivity, 88 Shore D hardness, and service from -40 to 130 deg C. Documented NASA outgassing values support evaluation for demanding electronic and aerospace assemblies.
Key features
- Catalyst-selectable processing: Compatible catalyst options support different mix, work-life, and cure requirements.
- Dielectric thermal performance: The CAT 9 cured system combines insulation with 0.66 W/(m K) thermal conductivity.
- Documented outgassing data: Typical TML and CVCM values support aerospace material evaluation.
Applications
Applications include general electrical and electronic potting, including assemblies requiring dielectric performance, thermal conduction, and documented outgassing data.
TDS, SDS & Technical Documents
Technical Specifications
No specifications available.
Additional Information
As-supplied / before-processing properties
The table uses the CAT 9 formulation; other approved catalysts have different ratios, viscosities, work lives, and cure schedules.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Product form | Black filled dielectric epoxy resin | Values below use CAT 9 catalyst | |
| Resin viscosity | 225,000 | cP | 25 deg C; Brookfield, spindle 7, 5 rpm |
| Resin specific gravity | 1.65 | Typical as supplied | |
| Mix ratio | 100:7 | parts by weight | Resin:CAT 9 |
| Mix ratio | 100:11.5 | parts by volume | Resin:CAT 9 |
| Mixed viscosity | 32,000 | cP | CAT 9; typical |
| Mixed specific gravity | 1.56 | CAT 9; typical | |
| Working time | 45 | minutes | CAT 9 at 25 deg C |
After-processing / final-state properties
Typical cured properties for the CAT 9 formulation.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Operating temperature | -40 to 130 | deg C | CAT 9 cured formulation |
| Hardness | 88 | Shore D | CAT 9 cured formulation |
| Water absorption | 0.25 | % | 24-hour boil; CAT 9 cured formulation |
| Coefficient of thermal expansion | 43.3 | ppm/deg C | TMA; CAT 9 cured formulation |
| Thermal conductivity | 0.66 | W/(m K) | ASTM D2214; CAT 9 cured formulation |
| Volume resistivity | 5 x 10^15 | ohm cm | 25 deg C; CAT 9 cured formulation |
| Dielectric strength | 17.7 | kV/mm | CAT 9 cured formulation |
| Outgassing | TML 0.37; CVCM 0.03 | % | Sample cured 8 hours at 25 deg C |
