Loctite SI 5910 Rtv Silicone Flange Sealant 50ml

LOCTITE SI 5910 is a low-strength, room-temperature vulcanizing (RTV) silicone gasketing compound engineered specifically for flexible flanges with machined or cast surfaces. Formulated to withstand significant joint movement and continuous oil exposure, this thixotropic paste reduces liquid migration post-application, ensuring a precise and reliable seal on both metal and plastic substrates.

Key Applications & Industrial Uses

• Stamped Sheet Metal Covers: Optimized for timing covers, oil sumps, and valve covers where high oil resistance is mandatory.
• Flexible Flange Sealing: Ideal for assemblies requiring excellent gap-filling capabilities (up to 1 mm) and resistance to continuous joint movement.
• Multi-Substrate Bonding: Provides high-adhesion sealing across both machined metal surfaces and structural plastics.

Technical Specifications

• Product Code: LOCTITE SI 5910 (50ml)
• Curing Type: Room Temperature Vulcanizing (RTV) Moisture Cure
• Viscosity: Thixotropic Paste (Resists migration after application)
• Color: Black
• Key Substrates: Metal, Plastic
• Maximum Gap Fill: Up to 1 mm
• Depth of Cure (in 24 hours): 2.75 mm
• Tensile Shear Strength: 1.2 N/mm² (Determined according to ISO 4587 on Aluminum lapshears at a bond gap of 0.5 mm)
• Temperature Range: -65°F to 500°F (-54°C to 260°C)

Application & Handling Guidelines

For optimal bonding performance, ensure all surfaces are thoroughly clean and free from grease or residual oil using Loctite 7063. Because moisture curing begins immediately upon exposure to the atmosphere, components must be mated within a few minutes of dispensing. Allow the assembly to fully cure before subjecting it to heavy service loads. Excess uncured material can be easily removed using non-polar solvents.

Safety & Storage Notice: This product is not recommended for use in pure oxygen or oxygen-rich systems, and must not be selected as a sealant for chlorine or other strong oxidizing materials. Store in the original unopened container in a dry location at an optimal storage temperature between 8°C and 21°C.

Frequently Asked Questions (FAQ)

What is the maximum gap-filling capability of LOCTITE SI 5910?
LOCTITE SI 5910 is designed to seal flexible flange gaps up to 1 mm. For automated production lines, a volumetric dispensing system is recommended to maintain consistent bead application.

How long does it take for LOCTITE SI 5910 to fully cure?
Moisture curing begins immediately upon exposure to air. It achieves a cure-through volume depth of 2.75 mm within 24 hours (at 23±2°C, 60±5% RH). For assemblies subjected to heavy service loads, a full cure time of up to 7 days is recommended.

Can LOCTITE SI 5910 be used on plastic flanges?
Yes. LOCTITE SI 5910 exhibits excellent adhesion to both machined/cast metal surfaces and engineered plastic substrates, making it highly versatile for multi-material flange designs.

Is LOCTITE SI 5910 resistant to automotive fluids?
Yes, this commercial-grade RTV silicone is specifically formulated to provide superior resistance to automotive oils, lubricants, and environmental joint movement, making it the industry standard for oil pan and timing cover seals.

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