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Hubble Bubble Rising

From JPCL, December 2017

More items for Quality Control

By Carl Reed, Greenman-Pedersen, Inc. (GPI), and Dr. Mike O’Donoghue and Vijay Datta, MS, International Paint LLC

This article examines the flaws of the current system of establishing and using specifications and testing. Because these flaws are so odious, a “better way” will be proposed in order to provide the end user real value in the use of protective coatings. Three tests will be discussed as illustrative examples of the flaws in the current system of using specifications and testing. These three tests are accelerated corrosion testing, pull-off adhesion testing, and constant stress, chemical immersion testing. Notwithstanding, this monograph will show how these tests, as examples of testing in general, can be used in a manner that provides the end user real value....


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Tagged categories: Accelerated laboratory testing; Carl Reed; Coating performance; Laboratory testing; Mike O'Donoghue; Performance testing; Service life; Specification; Specification writing; Specifiers; Testing + Evaluation; Vijay Datta

Comment from simon daly, (1/27/2018, 8:25 AM)

Rarely do I find myself fully agreeing with Mike and Vijay (at least not without being irked by the somewhat flowery language, keep it simple guys?) but this article contains many good points. However it omits one key issue in that in many cases accelerated testing is generally easy to access and as a result of that receives a disproportionate focus within our industry. Testing systems against each other and arbitrary values is relatively easy when compared to gathering meaningful experience based,performance data from the field. In addition to that the cost of such is almost always able to be passed on to the supplier whereas investigating actual field performance entails a significant cost to the customer which the supply chain has as yet found a way to share. On those rare occasions when experienced based data is presented it is often dismissed as clients are unable to express it into a form that is easy to explain and mandate to the supply chain. There is a danger to too much emphasis on actual performance in that it can stifle innovation however here comparative testing to proven performers is of some value. Additionally the challenge is often exacerbated by a lack of testing knowledge, and more importantly experience in interpreting testing results, amongst specification writers. The call for more realistic testing is a valid one, although this may sometimes be hindered by arbitrary conditions stipulated within individual test standards which may differ from the actual conditions you may wish to replicate, temperature being an obvious example of this.


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