Loctite SF 7400 Varnistop Marking Ink

LOCTITE SF 7400 Varnistop Marking Ink is a solvent-based, pigmented marking ink designed for use on electronic equipment. It provides a clear visual indicator for inspection, tamper-proofing and adjustment marking applications.

The formulation dries quickly through solvent evaporation and delivers strong adhesion to a variety of substrates. Its red liquid appearance ensures high visibility, making it suitable for marking components that require easy identification or verification.

This marking ink is commonly used to indicate that components such as adjustment points or fasteners have been set, inspected or secured, helping support quality control processes in electronic assemblies.

Key Features

• Solvent-based marking ink
• Pigmented organic polymer formulation
• Red colour for clear visual identification
• Fast drying through solvent evaporation
• Excellent adhesion to a wide range of materials
• Designed for tamper-proofing and inspection marking
• Suitable for use on electronic equipment

Typical Properties

• Viscosity (Brookfield, 20°C): approx. 1,030 mPa·s
• Solids Content: approx. 22.5%
• Tack-Free Time (100 µm): approx. 5 minutes
• Dry Time (100 µm): approx. 5 to 7 hours