Loctite SI 5990 40ml (1716588)

Description

Genuine Loctite · Part no. 1716588

Loctite SI 5990 is a 40ml copper-coloured silicone gasket sealant with high temperature and oil resistance, suitable on metals and plastics. It suits engine covers, thermostat housings and similar flanges that get hotter than an ordinary silicone likes, and it is electrically insulating.

Good to know

• How hot can it run? The facts say high temperature resistance but give no figure, so check the tube's rating against the joint before using it near an exhaust or turbo.
• Can it seal plastic covers? Yes, it lists metals and plastics, which suits modern plastic rocker covers and housings; clean off the old sealant without scoring the face.
• Does it replace a gasket on every joint? No; where the maker specifies a gasket of set thickness, use the gasket. Use it on flanges designed for a formed sealant.
• Why does electrical insulation matter? It can seal round connectors and sender units without creating a short, as long as it's kept out of the terminals themselves.

Which one?

For a stated heat figure, Loctite SI5926 Silicone Instant Gasket – Blue (1123349) is rated -54° to 150°C; for a bigger high temperature can, Granville High Temperature Instant Gasket – Black (0458A) is 200ml.

Key features

• 40ml
• Copper colour
• High temperature and oil resistant
• Suitable for metals and plastics
• Electrically insulating

Specification