This standard is issued under the fixed designation D ; the number 1 This practice is under the jurisdiction of ASTM Committee D01 on Paint and. Related. In nearly the same timeframe, the version of ASTM D, “Standard Practice for Nondestructive Measurement of Dry Film Thickness of. ASTM D describes three operational steps that must be performed prior to coating thickness measurement to help assure the reliability of.
|Published (Last):||15 April 2004|
|PDF File Size:||10.14 Mb|
|ePub File Size:||7.58 Mb|
|Price:||Free* [*Free Regsitration Required]|
Determining the Magnitude of Non-conforming Thickness.
Measuring Coating Thickness According To SSPC-PA 2 – Update 2015
ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. The accuracy of Type 1 magnetic pull-off gages is verified by placing the gage probe onto a certified coated thickness standard Figs.
For the purpose of final acceptance of the total dry film thickness, the cumulative thickness of all coating layers in each area must be no less than the cumulative minimum specified thickness astj no d70091 than the cumulative maximum specified thickness. However, since Type 1 gages are non-linear, one cannot assume a linear correction value across the full range of the gage.
Secondly, some Type 2 gages cannot be adjusted. This process is described later in this article. The two documents are designed to be used together.
For example, the thickness may need to be measured in each 9 m2 ft2 area in accordance with 8. Instrument Calibration Step 2: These steps include 1 gage calibration, 2 verification of gage accuracy and 3 gage adjustment. It describes the methods and recommended frequency for verifying the accuracy of gages and for adjusting optimizing the equipment, describes a frequency for measuring the thickness of the coating s and lists the reporting recommendations.
Equipment manufacturers produce nondestructive coating thickness testing gages that are used to measure the cumulative or individual thickness of the asstm layers, after they are astmm.
Measuring Dry Film Coating Thickness According to SSPC-PA 2KTA University
If the gage is dropped or suspected of atm erroneous readings during the work shift, its accuracy should be rechecked. Courtesy of SSPC The number of areas that must xstm measured for coating thickness varies, depending on the size of the coated area.
Section 10, Reporting was added to the standard in Obtaining base metal readings with Type 1 gage. Additionally, most manufacturers of high performance coatings will warranty coating systems based upon, in part, achieving the proper thickness of each layer and the total coating system.
The contained information helps for easy understanding. This section lists the items to report when documenting dry film thickness data, including: This includes personalizing atsm and advertising. Provisions for measuring on soft or tacky coatings are described in 5.
Correction for Base Metal Reading if acquired. However, because Type 1 gages are non-linear, one cannot assume a linear mil-for-mil correction value across the full range of the gage. SSPC-PA 2 contains three definitions that are critical to understanding this next area of discussion.
Measuring Coating Thickness According To SSPC-PA2 – Update KTA University
This procedure also verifies that the probe configuration will accommodate the edge configuration before acquiring coating thickness data. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. 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.
Asttm final step in the process is to adjust the gage on the surface to which the aztm will be applied. The actual minimum and maximum spot and area thickness requirements are shown in Figure 12 for each of the five restriction levels.
The manually operated gages may be susceptible to human error caused by inadvertently turning the dial wheel past the point at which the magnet pulls from the surface, yielding a false low measurement.
The user should consult the manufacturers instructions regarding the use of coating thickness gages on these types of coatings. Axtm thickness of each layer must be measured after it is applied. As a result, obtaining single-point measurements may not accurately represent the actual coating system thickness.
This measured distance is displayed as coating thickness by the gages. October 27, at 5: Don, The standard is independent of the substrate type, as long as the substrate is a ferrous or non-ferrous metal. October 27, at This standard was published over 10 years ago in Noncompensation for the base metal effect can result in an overstatement of the true thickness of the coating.
One of a variety of Type 2 gage probe configurations designed to better measure DFT of coatings on edges. For a given measurement direction or unit measurement, any compliant area or unit preceding a non-compliant area or unit is designated as suspect, and, as such, is subject to re-inspection after corrective measures are taken. Another change in the version of the standard is the procedure for identifying nonconforming areas Fig.
Any unusually high or low gage readings that are not repeated consistently are discarded. Even coated metal plates can wear or be damaged to an extent that gage readings are affected. d791
This average BMR is then deducted from subsequent coating thickness measurements to remove any effect of the base metal surface and its conditions.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
If a large number of measurements are being obtained, the user may opt to verify gage accuracy during measurement acquisition for example, hourly. The accuracy of Type 2 electronic gages can be verified by placing the gage probe onto a certified coated thickness standard described for Type 1 gages or certified shims Figures 7 and 8.
Measure the coating thickness. The number of areas that must be measured for coating thickness varies, depending on the size of the coated area.