Loctite SI 5900 BK 300 ml 12 pieces sold, price for 1 piece black, oil resistant silicone, easy to disconnect, good adhesion to metal, plastic, glass and ceramics

LOCTITE SI 5900 BK 300ML is a one-component, moisture-cured silicone FIP gasket maker designed for forming seals directly on flanges. The black thixotropic paste offers excellent resistance to engine oils and provides reliable sealing even when the joint is subject to movement and operates over a wide temperature range.

The product forms an elastic, durable gasket with very good adhesion to metals, many plastics, glass and ceramics, making it suitable for both production and maintenance of machinery and vehicles.

Advantages and unique features

• Excellent resistance to engine oils and service fluids – ideal for oil pans and engine covers.
• Thixotropic paste – does not slump, allowing precise application on horizontal and vertical flanges.
• Form-in-place gasket (FIP) – replaces conventional cut gaskets and exactly follows the flange shape.
• Good elasticity and high elongation at break – compensates thermal and mechanical movements in the joint.
• Outstanding adhesion to metals, many plastics, glass and ceramics – one cartridge for many applications.
• Allows low-pressure leak testing even before full cure is achieved.

Properties and applications

• FIP flange sealing: for forming gaskets on pressed sheet metal covers, oil pans, timing covers and other flanges in engines and machines.
• Oil resistance: recommended wherever the gasket is permanently exposed to engine or gear oils.
• Service and repair: ideal for workshops, industrial maintenance and service teams – one cartridge covers many joint types.
• Gap filling: fills gaps up to approximately 1 mm, compensating for surface irregularities on the flange.
• Operating conditions: the elastic seal maintains its性能 in a wide temperature range typical for engine and industrial applications.
• Professional use: intended for professional users only – appropriate PPE and compliance with the safety data sheet are required.

Technical data

Storage recommendations

Store LOCTITE SI 5900 BK 300ML cartridges tightly closed in a dry, cool place, preferably between +8 °C and +21 °C. Avoid prolonged storage below +8 °C and above +28 °C, as this may irreversibly change product properties. Do not return curing material to the original container and protect the product from moisture and direct sunlight. Always consult the latest safety data sheet and use appropriate personal protective equipment.

FAQ

1) Which silicone gasket maker for an oil pan and engine covers resistant to oil should I choose?
LOCTITE SI 5900 BK is a heavy-duty FIP flange sealant with excellent resistance to engine oils, making it ideal for oil pans, timing covers and other flanges in engines and gearboxes.

2) What is the service temperature range of LOCTITE SI 5900 BK?
The cured gasket typically remains elastic and sealing in a range of approximately -55 °C to +200 °C, covering most engine and industrial applications.

3) Can LOCTITE SI 5900 replace a conventional cut gasket?
Yes, it is designed as a form-in-place gasket maker and in many cases replaces cork or rubber gaskets, especially on pressed sheet metal covers.

4) How long does LOCTITE SI 5900 BK 300ML take to dry?
Skin formation time is usually 7–24 minutes at 25 °C, while full cure and final mechanical properties are reached after about 7 days (depending on bead thickness, temperature and humidity).

5) Is LOCTITE SI 5900 suitable for oxygen or chlorine systems?
No, the manufacturer does not recommend using this sealant in systems with pure oxygen, oxygen-rich mixtures or installations with chlorine and other strong oxidisers – a dedicated material must be selected for such applications.