Loctite SI 5920 Copper Silicone RTV
LOCTITE SI 5920 is a commercial-grade, low-strength silicone-based gasketing compound engineered for maximum reliability on flexible flanges with machined or cast surfaces. Specially formulated for heavy-duty industrial applications, this copper silicone RTV provides superior resistance to extreme thermal environments, making it the premier choice for automotive, manufacturing, and plant maintenance operations.
This non-corrosive, moisture-curing sealant is designed to fill gaps measuring up to 1 mm while maintaining its physical integrity under rigorous operating conditions, and it serves as an effective electrical insulating material.
Technical Specifications
- Product Name: LOCTITE® SI 5920™ Copper Silicone RTV Gasket (70ml)
- Curing Type: Room Temperature Vulcanizing (RTV) / Moisture Curing
- Color: Copper
- Viscosity: Thixotropic paste (reduced migration after application)
- Temperature Range: -65°F to 700°F (-54°C to 350°C)
- Tensile Shear Strength: 203.05 psi
- Key Substrates: Metal, Plastic
- Application Gap: Up to 1 mm maximum
Key Features & Benefits
- Extreme Thermal Resistance: Outperforms standard sealants in continuous-use environments up to 350°C.
- Thixotropic Formulation: Minimizes liquid migration and run-off immediately after application to the substrate.
- Non-Corrosive Compound: Safe for use on sensitive metals and electrical insulating applications.
- Flexible Flange Compatibility: Specifically designed to accommodate joint movement on machined or cast mating surfaces.
Directions for Use & Storage
- Surface Preparation: Ensure all bond surfaces are thoroughly clean, dry, and free from grease or residual oils before application. For optimal surface preparation, use a compatible industrial cleaner [Link to: Degreasing Solvents].
- Assembly: Moisture curing begins immediately upon atmospheric exposure. Mate and secure parts within a few minutes of dispensing.
- Full Cure: Allow the bond to fully cure before subjecting the assembly to heavy service loads. Excess material can be removed using non-polar solvents.
- Optimal Storage: Store unopened in a dry location between 8°C and 21°C. Storage below 8°C or above 28°C may adversely alter product properties.
- General Usage Disclosures: This product is not recommended for contact with gasoline. Do not use in pure oxygen and/or oxygen-rich systems, and do not select as a sealant for chlorine or other strong oxidizing materials. Consult the Safety Data Sheet (SDS) prior to handling.
Frequently Asked Questions
What is the maximum temperature limit for LOCTITE SI 5920?
LOCTITE SI 5920 is engineered specifically for high-temperature resistance, safely handling intermittent thermal exposure up to 700°F (350°C) and maintaining flexibility down to -65°F (-54°C).
Can LOCTITE SI 5920 copper silicone be used in contact with fuel?
No, LOCTITE SI 5920 is not recommended for applications where it comes into direct or prolonged contact with gasoline or petroleum-based fuels.
How long does it take for LOCTITE SI 5920 RTV to fully cure?
Moisture curing begins immediately upon atmospheric exposure. While parts should be mated within minutes of application, a full cure can take up to seven days under standard conditions before the assembly is subjected to heavy operational loads.
What is the maximum gap fill capability of this silicone sealant?
LOCTITE SI 5920 can be effectively applied in joint and flange gaps measuring up to a maximum of 1 mm.
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