LOCTITE SI 587 Silicone Gasket Sealant for Oil Pans, Valve Covers and Engine Flanges

LOCTITE SI 587 Silicone Gasket Sealant Benefits

LOCTITE SI 587 Silicone Gasket Sealant offers excellent resistance to industrial lubricants and automotive engine oils. The cured material remains flexible instead of becoming hard and brittle, allowing it to accommodate vibration, impact, thermal expansion and normal movement between mating flanges.

The ready-to-use formulation requires no resin-to-hardener measurement or mixing. This reduces preparation time and simplifies manual maintenance, repair and automated production dispensing. Its thixotropic consistency limits migration from the application area and helps operators create a continuous bead around corners, bolt holes and irregular sealing paths.

The metallic-blue appearance also supports visual inspection before assembly. After curing, the material enhances the load-bearing and shock-absorbing characteristics of the sealed area while helping prevent oil leakage through surface imperfections and flange irregularities.

Applications for LOCTITE SI 587 Silicone Gasket Sealant

LOCTITE SI 587 Silicone Gasket Sealant is suitable for gasket replacement and gasket dressing in automotive, industrial and maintenance applications. Typical uses include valve covers, rocker covers, oil pans, water pumps, intake manifolds, end seals and rear axle housings.

The product can also be used for bonding and repairing fabricated silicone gaskets. It is especially useful on stamped-metal covers and flexible flange assemblies that experience vibration or movement during service. Additional applications may include pump housings, gearbox covers, machinery flanges, compressor assemblies and industrial equipment exposed to lubricating oils.

Henkel states that the product is typically used in demanding applications at temperatures up to approximately 260°C. Actual suitability depends on exposure time, fluid type, flange design, pressure, joint movement and curing conditions.

LOCTITE SI 587 Silicone Gasket Sealant Properties

The uncured product is a metallic-blue oxime silicone paste with a specific gravity range of approximately 1.28 to 1.33 at 25°C. Its tack-free time is approximately 10 to 50 minutes at 25°C and 50% relative humidity.

After seven days of curing under the specified conditions, typical properties include tensile strength of at least 1.6 N/mm², elongation at break of at least 350% and Shore A hardness between 26 and 40. These properties provide a flexible elastomeric gasket capable of following normal flange movement and thermal cycling.

The published values are typical technical references rather than guaranteed purchasing specifications. Final performance depends on surface cleanliness, bead dimensions, humidity, temperature, flange material, assembly pressure and curing time.

How to Apply LOCTITE SI 587 Silicone Gasket Sealant

Remove the existing gasket material and other heavy contamination from both flange surfaces. Clean and dry the mating areas thoroughly, ensuring they are free from grease, oil, dust, moisture and loose residue.

Apply a continuous bead of LOCTITE SI 587 Silicone Gasket Sealant to one sealing surface. Circle all bolt holes and use a bead diameter appropriate for the flange width and gap. Avoid excessive application that may create unnecessary squeeze-out inside the assembly.

Mate the components within approximately ten minutes and tighten the fasteners according to the equipment manufacturer’s recommended sequence and torque. Remove uncured excess with a compatible non-polar solvent. Full performance properties develop over approximately 72 hours, although curing time varies with temperature, humidity and joint dimensions.

Important Use and Storage Guidance

Do not use the product in pure oxygen, oxygen-rich systems, chlorine service or contact with strong oxidizing materials. It is also unsuitable for constant contact with hydrocarbon fuels or concentrated acetic, hydrochloric, nitric and sulfuric acids.

Store unopened containers in a dry location between 8°C and 21°C. Review the current Safety Data Sheet before handling and complete application testing using the actual flange materials and service conditions.

Why Choose LOCTITE SI 587 Silicone Gasket Sealant?

LOCTITE SI 587 Silicone Gasket Sealant combines superior oil resistance, flexible cured performance, high-temperature capability and controlled one-component application. It is a practical solution for oil pans, valve covers, water pumps, intake manifolds and industrial flange assemblies requiring dependable form-in-place sealing.

Review the official Henkel LOCTITE SI 587 Technical Data Sheet before qualification. Explore our silicone gasket sealants for additional automotive and industrial flange-sealing solutions.