Loctite SI 5900 – RTV Silicone Gasket Maker for Oil-Resistant and High-Temperature Sealing

✅ Loctite SI 5900 is a premium RTV (Room Temperature Vulcanizing) silicone gasket maker designed for sealing rigid metal flange assemblies and preventing leakage in demanding industrial and automotive applications. It offers excellent resistance to oil, vibration, weathering, and elevated temperatures, making it an ideal replacement for conventional pre-cut gaskets.

✅ The sealant cures at room temperature by reacting with moisture in the air, forming a durable and flexible silicone rubber gasket. Once fully cured, Loctite SI 5900 maintains long-term elasticity, effectively compensating for flange movement, thermal expansion, and surface irregularities while ensuring reliable sealing performance.

✅ One of the key advantages of Loctite SI 5900 is its excellent resistance to engine oil, transmission fluid, lubricating oils, water, and many industrial chemicals. This makes it suitable for applications exposed to continuous oil contact and fluctuating operating temperatures.

✅ The product features a black silicone formulation with excellent adhesion to aluminum, steel, stainless steel, cast iron, and many other metallic surfaces. It can replace paper gaskets, cork gaskets, and rubber gaskets, simplifying assembly while reducing inventory requirements.

✅ After complete curing, the silicone gasket provides outstanding resistance to vibration, moisture, aging, and harsh environmental conditions. Its flexibility helps maintain sealing integrity over long service periods, reducing maintenance costs and improving equipment reliability.

✅ Manufactured by Henkel under the trusted Loctite brand, SI 5900 is widely used in automotive manufacturing, industrial machinery, power generation, mining, marine engineering, oil & gas facilities, and equipment maintenance applications worldwide.

Technical Specifications

✅ Product Name: RTV Silicone Gasket Maker

✅ Model: Loctite SI 5900

✅ Brand: Loctite

✅ Manufacturer: Henkel

✅ Origin: Depending on Henkel Manufacturing Facility

✅ Product Type: RTV Silicone Sealant

✅ Color: Black

✅ Curing Mechanism: Moisture Cure

✅ Chemistry: Oxime Silicone

✅ Oil Resistance: Excellent

✅ Operating Temperature: -55°C to +200°C

✅ Intermittent Peak Temperature: Approximately +250°C

✅ Skin Formation Time: Approximately 10–20 Minutes

✅ Full Cure Time: Approximately 24 Hours (Depending on Bead Thickness)

✅ Flexibility: Excellent

✅ Vibration Resistance: Excellent

✅ Water and Chemical Resistance: Excellent

✅ Compatible Materials: Aluminum, Steel, Stainless Steel, Cast Iron, and Other Metals

Applications

✅ Engine Gasket Sealing

✅ Gear Reducers

✅ Gearboxes

✅ Industrial Pumps

✅ Air Compressors

✅ Equipment Flanges

✅ Mechanical Covers

✅ Hydraulic Equipment

✅ Pneumatic Equipment

✅ Industrial Machinery

✅ Manufacturing Equipment

✅ Industrial Maintenance and Repair

Hotline: 0084 787900099