Loctite 5920 Copper Maxx Silicone 85g

Loctite 5920 (Henkel data sheet name: Loctite SI 5920) is a one-component, copper-coloured, moisture-curing, non-corrosive silicone. It cures at room temperature (RTV) and is thixotropic, so the liquid product shows reduced migration.

Henkel lists it for gasketing and sealing where excellent temperature resistance is required, and for electrical insulating applications. It is typically used in applications up to 350 °C. This is the 85 g pack.

Where this product is used

• Gasketing and sealing where excellent temperature resistance is required
• High temperature sealing, typically used in applications up to 350 °C
• Electrical insulating applications (volume resistivity data is in the data sheet)
• Sealing where a non-corrosive silicone is wanted

Features

• One component, no mixing
• Copper-coloured thixotropic paste with reduced migration of liquid product
• Moisture-curing, non-corrosive silicone
• Room temperature vulcanising (RTV) cure
• Skin-over in 20 minutes; tack-free in 20 to 60 minutes at 22 °C and 50% RH
• Elongation of 350% or more once cured (ISO 37)
• Electrically insulating: volume resistivity 5.5 x 10^15 ohm·cm

Key specifications

Selecting the right option

For a red acetoxy silicone for high temperature sealing see Loctite 596 Superflex RTV High Temperature Silicone Sealant Red. For oxime silicones see Loctite 587 Blue Maxx Silicone Flange Sealant 300ml (blue) and Loctite 598 Black RTV Silicone Gasket Maker 95g (black). Compare the temperature statements on each data sheet before choosing.

Using it

Skin-over time is 20 minutes and tack-free time is 20 to 60 minutes at 22 °C and 50 ± 5% RH. Henkel advises allowing the bond to cure (for example seven days) before heavy service loads.

The data sheet gives no gap-fill figure. Lap shear was tested at a 0.55 mm gap after 21 days at 22 °C and 50% RH: e-coated steel 1.3 N/mm², grit-blasted mild steel 0.65 N/mm², brass and ABS 0.1 N/mm². These are test conditions, not a gap-fill rating.

Heat-ageing shear strength data is given in the Henkel data sheet.

Storage and handling

Store unopened in a dry location, optimally between 8 °C and 21 °C. Storage below 8 °C or above 28 °C can adversely affect the properties of the product. Henkel does not state a shelf life.

Limits and safety

Not recommended for contact with gasoline, for pure oxygen or oxygen-rich systems, or as a sealant for chlorine or other strong oxidising materials. Henkel states no lower service temperature. Read the safety data sheet before use.

Frequently asked questions

What temperature can Loctite 5920 handle?

Henkel states it is typically used in applications up to 350 °C. No lower limit and no continuous or intermittent split is given.

Is Loctite 5920 non-corrosive?

Yes. Henkel describes it as a moisture-curing, non-corrosive silicone, and notes use in electrical insulating applications.

How long does Loctite 5920 take to cure?

Skin-over in 20 minutes and tack-free in 20 to 60 minutes at 22 °C and 50% RH. Allow it to cure, for example seven days, before heavy service loads.

Can Loctite 5920 be used with petrol?

No. Henkel does not recommend it for contact with gasoline, or for pure oxygen or chlorine and strong oxidiser systems.

What gap can Loctite 5920 fill?

The Henkel data sheet gives no gap-fill figure. Lap shear was tested at a 0.55 mm gap, which is a test condition and not a capability rating.

Does Loctite 5920 have approvals?

The current Henkel data sheet lists no approvals; contact AIMS if you need a certificate for a specific application.

Related products

See also: Loctite 596 Superflex RTV High Temperature Silicone Sealant Red, Loctite 587 Blue Maxx Silicone Flange Sealant 300ml, Loctite 598 Black RTV Silicone Gasket Maker 95g, Loctite SI 5699 Grey RTV Silicone Gasket Maker, Loctite SI 5900 Flange Sealant 300ml.