ASTM D7378 - 16 - Standard Practice for Measurement of Thickness of Applied Coating Powders to Predict Cured Thickness

ASTM D7378 - 16

Standard Practice for Measurement of Thickness of Applied Coating Powders to Predict Cured Thickness

Status : Current   Published : January 2016



1.1 This practice describes the thickness measurement of dry coating powders applied to a variety of rigid substrates. Use of some of these procedures may require repair of the coating powder. This practice covers the use of portable instruments. It is intended to supplement the manufacturers’ instructions for their operation of the gages and is not intended to replace them. It includes definitions of key terms, reference documents, the significance and use of the practice, and the advantages and limitations of the instruments.

1.2 Three procedures are provided for measuring dry coating powder thickness:

1.2.1  Procedure A—Using rigid metal notched (comb) gages.

1.2.2  Procedure B—Using magnetic or eddy current coating thickness gages.

1.2.3  Procedure C—Using non-contact ultrasonic powder thickness instruments.

1.3 Coating powders generally diminish in thickness during the curing process. Some of these procedures therefore require a reduction factor be established to predict cured film thickness of powder coatings.

1.4  Procedure A and Procedure B 

measure the thickness (height or depth) of the applied coating powders in the pre-cured, pre-gelled state. By comparing results to the measured cured powder thickness in the same location, a reduction factor can be determined and applied to future thickness measurements of the same coating powder.

1.5  Procedure C 

results in a predicted thickness value of the cured state based on a calibration for typical coating powders. If the powder in question is not typical then an adjustment can be made to align gage readings with the actual cured values as determined by other measurement methods.

1.6 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.7  This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Standard NumberASTM D7378 - 16
TitleStandard Practice for Measurement of Thickness of Applied Coating Powders to Predict Cured Thickness
Publication Date12 January 2016
Normative References(Required to achieve compliance to this standard)No other standards are normatively referenced
Informative References(Provided for Information)No other standards are informatively referenced
Descriptors Coating powder, Coating thickness, Film thickness, Powder coating, Powder thickness, Thickness prediction, Ultrasonic
File Size158 KB

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