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THE ABILITY OF A COATING TO RESIST CHEMICAL deterioration or staining is an essential element in its evaluation . Aesthetics play a key role in the decoration of a coated object. Certainly more purchasers of coated products are moved initially by appearance than by price. It has been said that a coating is a complex material that is often a component of a coatings system, which in turn provides added value to a final product.2 What follows is a review of established test procedures with various levels of complexity and equipment sophistication that provide standardized tools for evaluation of potential flaws such as discoloration, softening, swelling, adhesion loss, gloss reduction, and pitting of the paint finish. Some methods include visual standards such as those for blister size and density or for corrosion which offer a common ground for communication or performance properties between the manufacturer and the end user of a coating. Other tests are less definitive, and while they can give insight as to how the paint may function during service, they do not necessarily correlate precisely with real life conditions. Yet, since these tests are to function in lieu of actual field exposure to predict ultimate performance, it is crucial that accelerated or simplified test parameters reproduce both the chemical as well as the physical effects of field exposure.
Price, Latoska N.
Technical Manager Decorative Coatings, BASF Corporation, Newport, DE