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Friction coefficients and temperature resistance
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• The presence of the adhesive coating determines the coefficient of friction in the thread. Therefore, the adhesive compound must meet the coefficient of friction window requirements specified by the end user. precote 85 and precote 30 meet these requirements world-wide.
• After the adhesive coating, the coefficient under head or nut’s contact surface (which determines ~ 50% of the tightening torque) can be optimized by means of an immersion process in compatible wax emulsions or topcoats. It is also possible to apply the under-head coating locally and the adhesive coating simultaneously, sometimes even in parallel.
• In terms of temperature resistance, only positive results after a long-term test of at least 1,000 h (resistance to ageing) is to be considered valid. Shorter tests have little or no value.
• In terms of temperature statements, the torque requirements as per DIN 267, part 27, must be complied with.
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