The preliminary coatings used in bonding contain micro- encapsulated, adhesive components in the coating to be applied. After drying, a non-sticky, dry film with product- specific coloration is then formed, which is immediately ready to use. The screw threads thus threated, develops the required protection and sealing characteristics after the pre-applied screw is screwed into the nut or specific component.
A differentiation is made between reactive and non- reactive adhesives.
Reactive adhesives (precote® 30, 80, 85, Scotchgrip 3M®) consist of 2 components. Acrylate and epoxy base for threadlocking and sealing.
Non-reactive adhesives (precote® 4, 5, 6, 9, 10-1, 19-2) are on an acrylate and polyamide base for threadlocking and sealing, too.
Temperature resistance -60°C to +200°C
• High breakaway torques
• Low screw-in torque
• Fast hardening
• Ease of identification by means of different colorsg
• Chemical resistance against most oils and solvents
• Replaces liquid adhesives and a mechanical protection
The installation of the pre-applied screws can be implemented mechanically or manually with traditional tools. By means of a fully-automated supply system, productivity is increased.
The component parts to be coated should be oil-free and grease-free as far as possible. It is not required as mandatory, however, torque values are reduced as a result.