Certain Anti-Wear (AW) and Extreme Pressure (EP) lubricant additives are corrosive to yellow metals. The Copper Strip Corrosion test qualifies the corrosively of an oil to a polished copper strip. The polished copper strip is coated with the lubricant in question and placed in a heated water bath for 3 hours. The tarnish color of the copper strip is then compared to ASTM standards and given a rating. Quality lubricants will have a rating of 1A or 1B. Generally, the rating should be less than 3 for a ‘pass’ rating.

The Copper Strip Corrosion test should not be a part of your routine analysis program. It is a quality check of the lubricant and should be performed for evaluation of new oils or when tarnishing or corrosion of yellow metals are suspected or apparent.

Ask our expert oil analyst.

We specialize in machine fluid testing, sampling, and oil analysis programs for any industry.