Overview of Henkel Loctite SI 5910
Loctite SI 5910 is a one-component, moisture-cured silicone gasket sealant designed to create form-in-place gaskets on flexible flanges with machined or cast surfaces. It cures at room temperature into a resilient, rubbery silicone that resists automotive oils, vibration, and joint movement.
Unlike rigid adhesives or preformed gaskets, SI 5910 fills irregularities and moves with the mating parts to maintain seal integrity over time—ideal for dynamic assemblies where thermal cycling or vibration are present.
🔩 Key Features & Benefits
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1-component RTV silicone — easy application; no mixing needed.
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Form-in-place gasketing — creates durable seals on flexible flanges and surfaces.
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Excellent oil resistance — ideal for engine covers, oil sumps, timing covers and similar housings.
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Thixotropic paste — stays in place after dispensing; minimizes sagging or migration.
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Gap filling up to ~1 mm — cures through up to about 2.75 mm in 24 h.
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Wide service temperature range: ~-55 °C to 200 °C (-65 °F to 400 °F).
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Rapid skin-over time — supports faster curing and handling.
Typical Use Cases
SI 5910 is commonly used in industries where gasket replacement or custom seal creation is needed, including:
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Automotive & Aftermarket:
Sealing flexible flanges on timing covers, oil sumps, valve covers, and housings where oil resistance and movement tolerance are critical. -
Industrial Manufacturing:
General purpose flange sealing on metal or engineered plastic housings and covers. -
Maintenance & Repair Operations (MRO):
Field service sealing of flexible flanged joints in heavy equipment, pumps, compressors, and HVAC systems.
How It Works
Application & Sealing Strategy:
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Surface Prep:
Clean both flange surfaces thoroughly to remove grease, oil, and dirt for best adhesion. -
Dispense Sealant:
Apply SI 5910 into the joint area using a cartridge gun or automated dispenser, forming a continuous bead where the gasket interface will be. -
Assemble & Cure:
Mate the flanges and allow the sealant to begin curing. The moisture in the air triggers room-temperature vulcanization (RTV), forming a flexible, rubbery gasket. -
Performance:
Once cured, the silicone gasket resists oil exposure and adapts to joint movement and vibrations — preserving seal integrity.
Benefits Over Traditional Gaskets
✔ Custom fit to any flange geometry — no need for custom die-cut gaskets.
✔ Improved durability — resists oil, joint movement, and vibration better than fiber or cork gaskets in many dynamic applications.
✔ Ease of use — 1-component, moisture-cured system means fewer handling steps.
✔ Reduced inventory — one sealant can replace multiple preformed gasketing parts.
Technical & Handling Essentials
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Color: Black.
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Form/Viscosity: Thixotropic paste for controlled application.
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Tack-Free Time: ~40 min.
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Storage: 8 °C – 21 °C.
Tip: Allow a full cure (depth and tack-free) before subjecting the sealed joint to operating stresses and fluids.
Avantek Viet Nam is an experienced supplier of Henkel Loctite SI 5910 (300 ml), serving customers across automotive, electronics, industrial manufacturing, and MRO sectors in Vietnam.
We provide:
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Competitive pricing tailored for both project and volume requirements
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Stable stock and short lead times, minimizing production downtime
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Technical support to help customers select the right gasketing and sealing solution
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Genuine Henkel products, ensuring consistent quality and performance
With deep experience in industrial adhesives, sealants, and assembly solutions, Avantek Viet Nam is not only a distributor but a trusted technical partner, helping customers optimize assembly processes, improve product reliability, and reduce total cost of ownership.
👉 Choose Avantek Viet Nam as your optimal and reliable partner for Henkel Loctite SI 5910 and a complete range of industrial adhesive solutions.
