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November 25 - December 2, 2015

What tests and criteria can a coatings user specify to assure consistent lot-to-lot performance of supplied coatings?

Selected Answers

From Tom Schwerdt of Texas Department of Transportation on December 10, 2015:
It's not really practical for the end user to test lot-to-lot performance. Typically, performance testing is only for qualification as the testing is time-consuming. Lot/batch testing usually focuses on whether the product is consistent with the qualified batch: Viscosity, density, % solids, % pigment, sag, dry time, opacity/hiding power, color and FTIR are relatively common for this purpose, depending on the specific application. For example, a zinc primer typically wouldn't have the color matched against a standard, but the finish coat/topcoat would. Conversely, zinc purity might be verified in the primer, but not the topcoat.

From Sarah Geary of RockTred on December 9, 2015:
Typically, there's a spec range all batches need to meet in-house at the manufacturing facility before they are quality control- approved and can be let out the door. Could you be more specific with this question?

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