BS EN 4875:2020,Aerospace series – Surface treatments – Test method for measurement ofelectrical contact resistance.
BS EN 4875:2020 describes the electrical contact resistance testing method applicable to conductive and non-conductive coatings applied on test specimens made of conductive materials (unless otherwise specified) for aerospace applications. An objective of this practice is to define and control many of the known variables in such a way that valid comparisons of the contact properties of materials can be made.
This test may be locally destructive depending on the process tested.
Each individual measurement shall be recorded and the result shall be expressed as resistance persurface unit (square inch or square millimeters).
Electrical contact resistance testing results will vary depending on the substrate material and should be
compliant to the process specification requirement.