LOCTITE SI 5091
Harmonization Code : 3907.30.00.40 | Epoxy Mold Compounds containing by weight more than 70 % silicon dioxide
Main features
- Self-Leveling Cavity Filling
- UV and Moisture Cure Access
- Flexible Shock-Absorbing Seal
Product Description
LOCTITE SI 5091 is a one-component, self-leveling acetoxy silicone for potting, coating and sealing. UV light provides the primary cure, while atmospheric moisture cures shadowed areas. At 25 deg C, typical viscosity is 4,000 to 6,000 mPa s, and additional cure properties develop over 72 hours at ambient conditions. Cured properties include Shore A hardness of 31 to 37, elongation of at least 75% and dielectric breakdown strength of 18 kV/mm in a highly flexible elastomer. Applications include automotive, electronic, military and industrial components.
Key features
- Self-leveling fill: The liquid is self-leveling for uniform cavity fill.
- UV-plus-moisture cure: UV light provides primary cure while moisture cures shadowed areas.
- Flexible cured elastomer: Cured material has Shore A hardness of 31 to 37 and elongation of at least 75%.
Applications
Potting, coating and sealing automotive, electronic, military and industrial components.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Physical Properties
Chemical Properties
Mechanical Properties
Electrical Properties
Additional Information
As-supplied / before-processing properties
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Appearance | Translucent liquid | Uncured; LMS | |
| Specific gravity | 1.01 | Typical; 25 deg C | |
| Solids/non-volatile content | >95 | % | Typical; uncured |
| Viscosity | 4,000 to 6,000 | mPa s | LMS; Brookfield RVT; spindle 3; 10 rpm; 25 deg C |
After-processing / final-state properties
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Shore hardness | 31 to 37 | Shore A | LMS; ISO 868; 75 mW/cm^2 at 365 nm for 60 s/side, then 3 days at 22 deg C/50 +/- 5% RH |
| Elongation | >=75 | % | LMS; ISO 37; stated light cure plus 3 days at 22 deg C/50 +/- 5% RH |
| Tensile strength | >=0.6 | N/mm^2 | LMS; ISO 37; stated light cure plus 3 days at 22 deg C/50 +/- 5% RH |
| Shrinkage | 0.2 | % | Typical; 40 mW/cm^2 for 60 s/side, then 7 days at 22 deg C/50% RH |
| Tear strength | 0.7 | N/mm | Typical; ISO 34-1, Die B; stated light cure plus 7 days at 22 deg C/50% RH |
| Dielectric breakdown strength | 18 | kV/mm | Typical; IEC 60243-1; stated light cure plus 7 days at 22 deg C/50% RH |
| Volume resistivity | 3.3 x 10^13 | ohm cm | Typical; IEC 60093; stated light cure plus 7 days at 22 deg C/50% RH |
