Background of SSPC PA 2; Overview and Purpose of SSPC-PA 2 (); Purpose of ASTM D ; Definitions; Gage Descriptions; Calibration & Verification. ASTM D focuses on gage use. • SSPC-PA 2 () focuses on acceptability of acquired measurements. • Both address ferrous and non-ferrous metal. This standard is issued under the fixed designation D ; the number immediately following the 1 This practice is under the jurisdiction of ASTM Committee D01 on Paint and . manufacturer’s specifications, n—a statement or set.
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Non-compliant areas are demarcated using removable chalk or another specified marking material and documented.
Method for Measuring the Dry Film Thickness of Coatings on Edges For decades, the industry was cautioned about taking asrm thickness measurements within one inch of an edge, let alone on an edge. The standard has been updated on multiple occasions.
The operating principle is simple. Because the coating may not perform at the lower thickness, it is important for the specifier to indicate an acceptable range for each coating layer.
Measuring Dry Film Coating Thickness According to SSPC-PA 2KTA University
Acceptability of Gage Readings, Spot Measurements, and Area Measurements While individual gage readings that are unusually high or low and cannot be repeated consistently can be discarded, there are limitations on the thickness values representing the spot measurements the average of three gage readings.
Verifying accuracy of Type 2 gage on a certified coated standard Fig. These steps are 1 gage calibration, 2 verification of gage accuracy and 3 gage adjustment.
Magnetic pull-off gages are categorized as Type 1 Fig. Acquisition of more than three gage readings within a spot is permitted. A one-year calibration interval is a typical starting point suggested by gage manufacturers. The accuracy of Type 1 magnetic pull-off gages is verified by placing the gage probe onto a certified coated thickness standard Figs.
Isolation of nonconforming areas required measurement of each square foot area painted during the work shift. Recently I had problem while calibrating. I am assuming you are using an electronic gage:. This method is used when the largest dimension of the unit is less than 10 feet.
Start Webshop Product catalog Product presentation. If so which is the d7019 surface for calibrating? This process is described later in this article. Verifying accuracy of Type 2 gage using a certified shim.
For example, if the adtm use is between 4 and 6 mils, then a five-mil coated standard is appropriate. A one-point or two-point accuracy verification procedure can be performed; typically, the two-point verification provides greater accuracy.
If a large number of measurements are being obtained, the user may opt to verify gage accuracy during measurement acquisition for example, hourly. ASTM grants you a license as follows: Keane Award of Merit. October 17, at 8: Five different Coating Thickness Restriction Levels established. You will have access to the ast via our webpage standard. Contained 6 appendices Contains 8 appendices.
Leave a Reply Cancel reply Your email address will not be published. If spot measurement variances result in area measurements that do not meet the specification, then additional spot measurements are acquired radiating outward in eight directions from the nonconforming area to determine the magnitude of the non-conforming d0791.
Measuring Dry Film Coating Thickness According to SSPC-PA 2
The scale is not linear, as will be discussed below. I would like to purchase a book regarding painting standards on thickness of painting. Adjustments to the gage may or may not be required. February 5, at 2: The most current version of the ASTM standard focuses on proper gage use, while SSPC-PA 2 focuses primarily on the frequency of measurements and the acceptability of the acquired measurements.
d7901 While individual gage readings that are unusually high or low and cannot be repeated consistently can be discarded, there are limitations on the thickness values representing the spot measurements the average of three gage readings. It is important to note that both documents address the measurement of the DFT of coatings on ferrous and non-ferrous metal substrates.