Loctite SI 587 Blue High Performance RTV Silicone Gasket Maker 95g

Loctite SI 587 is a metallic blue, one-component oxime silicone gasket maker. It cures at room temperature with moisture from the air (RTV), and the thixotropic paste stays in place on the flange.

Henkel lists it for gasketing and sealing, for replacing and dressing gaskets, and for bonding and repairing fabricated silicone gaskets. It has excellent resistance to automotive engine oils and adheres to a wide range of substrates.

Where this product is used

• Gaskets on valve covers and rocker covers
• Oil pans and rear axle housings
• Water pumps, end seals and intake manifolds
• Replacing and dressing gaskets
• Bonding and repairing fabricated silicone gaskets

Features

• One component, no mixing, thixotropic paste
• Metallic blue oxime silicone, room temperature moisture cure (RTV)
• Tack-free in 10 to 50 minutes at 25 °C and 50 % RH
• Full performance properties develop over 72 hours
• Excellent resistance to automotive engine oils
• Adheres to a wide range of substrates
• Cured elongation of at least 350 %, Shore A hardness 26 to 40

Key specifications

Selecting the right option

For other silicone gasket makers in the Loctite range see Loctite 587 Blue Maxx Silicone Flange Sealant 300ml, Loctite SI 5900 Flange Sealant 300ml and Loctite SI 5699 Grey RTV Silicone Gasket Maker. Compare the data sheets for the flange type and fluids you are sealing.

Using it

Tack-free time is 10 to 50 minutes at 25 °C and 50 % RH. Full performance properties develop over 72 hours.

Do not return used product to the container.

Storage and handling

Store unopened in a dry location, ideally between 8 °C and 21 °C. Storage below 8 °C or above 28 °C can adversely affect the properties of the product. Do not return used product to the container.

Limits and safety

Not recommended for pure oxygen or oxygen-rich systems, as a sealant for chlorine or strong oxidisers, for carburettors or fuel control devices in constant contact with hydrocarbon fuels, or for concentrated acetic, hydrochloric, nitric or sulfuric acids. Henkel says it is typically used in applications up to 260 °C and states no low-temperature limit. Read the safety data sheet before use.

Frequently asked questions

How long does Loctite SI 587 take to skin over?

Tack-free time is 10 to 50 minutes at 25 °C and 50 % RH. Full performance properties develop over 72 hours.

What temperature can Loctite SI 587 handle?

Henkel says it is typically used in applications up to 260 °C. The data sheet gives no low-temperature limit.

Is Loctite SI 587 oil resistant?

Yes. Henkel describes excellent resistance to automotive engine oils.

Is Loctite SI 587 food safe?

No. It is registered to NSF Category P1 for use as a sealant where there is no possibility of food contact. Henkel notes this is a regional approval.

What should I not use Loctite SI 587 on?

Oxygen-rich systems, chlorine or strong oxidisers, carburettors or fuel controls in constant contact with hydrocarbon fuels, and concentrated acetic, hydrochloric, nitric or sulfuric acids.

How flexible is cured Loctite SI 587?

After 7 days at 25 °C and 50 % RH, elongation is at least 350 % and Shore A hardness is 26 to 40.

Related products

See also: Loctite 587 Blue Maxx Silicone Flange Sealant 300ml, Loctite 598 Black RTV Silicone Gasket Maker 95g, Loctite SI 5900 Flange Sealant 300ml, Loctite SI 5699 Grey RTV Silicone Gasket Maker, Loctite 5920 Copper Maxx Silicone 85g.