Micom laboratories is proud to announce that it now offers the ASTM D4214 standard as part of its paint testing services. This method details four test procedures that may be used to assess the degree of chalking of exterior paint films through a comparison with the photographic standard provided by this practice or by the quantification of the reflectance of the residue collected by an adhesive tape. Lastly, this standard does not supply a conditioning procedure for the specimen.
ASTM D4214 test
The objective of ASTM D4214 is to characterize the degree of chalking through a visual inspection or by measuring the reflectance value of the residue collected with an adhesive tape. More specifically, the visual inspection consists of comparing the chalk transferred to a fabric, a fingertip or onto a tape with the photographic references supplied by this practice in order to assign a rating through the identification of the standard that best represents the observed chalking. On the other hand, it is also possible to determine the chalk rating of the specimen by appraising its reflectance measurements, because this test protocol provides a table which shows the correspondence between those two attributes. On another vein, it is important to state that the degree of chalking is a property that varies over a given area. Hence, it is primordial to assess a median section of the coating for smaller surfaces and to execute multiple readings for large areas. Lastly, this method may be paired with an accelerated aging test as a means to evaluate the stability of the paint over the course of time.
Micom offers polymer testing services for a wide selection of material and products. For more information about the ASTM D4214 test, we invite you to contact our material testing laboratory today. It will be our pleasure to answer your questions about either of those tests.
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