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.
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This measured distance is displayed as coating thickness by the gages.
It is recommended that the gage 5 be veri? The force holding the permanent magnet to the ferrous base is inversely proportional to the thickness of the coating layer s asmt the magnet and the ferrous substrate. These gages use electronic circuitry to convert a reference signal into coating thickness and are more popular than Type 1 gages.
Verifying accuracy of Type 2 gage using a certified shim Adjusting Type 2 Gages The final step in the process is to adjust the gage on the surface to which the coating will be applied. Spot measurements are obtained on repeating structural units or elements of structural units until two consecutive units in each direction are conforming or until there are no more units to test.
The Table enables the specifier to select from five different restriction levels related to spot and area measurements. Most Type 1 magnetic pull-off gages do not require a power source for example, batteries. This measured distance d701 displayed as coating thickness by the gages. SSPC-PA 2 states that a minimum of 10 locations arbitrarily spaced should be measured one reading per locationthen averaged.
Measuring Coating Thickness According To SSPC-PA2 – Update KTA University
Link to Active This link will always route to the current Active version of the standard. We can gather hundreds of gage readings in a relatively short time; batch the measurements; print the data or upload it to a computer for graphing; report the highest, the lowest, the mean, and standard deviation of the collected data; incorporate digital images of the structure or coated area; and even program the gage to produce an audible signal if a spot measurement is outside of the tolerance range.
There are three categories of coated area: I am assuming you are using an electronic gage:. October 17, at 8: If shims are selected to verify gage accuracy, they should be placed on a smooth steel plate zero-plate.
Measuring Dry Film Coating Thickness According to SSPC-PA 2
Acceptable spot measurements are defined by the minimum and maximum values in the contract documents. Within each area, five randomly spaced spots are selected. While the gage may be out of tolerance by 0. The information presented in the graphics below illustrates the shortcomings of the version of the standard and the major updates to the version of the standard that address these shortcomings. The number of spot measurements along the edge will vary depending on the total length of the coated edge.
For example, if a gage reads 5.
May 20, at 2: If the gage is dropped or suspected of giving erroneous readings during the work shift, its accuracy should be rechecked. The scale is not linear.
October 27, at 5: For gages measuring on ferrous substrates, the magnetic induction or Hall-effect principles determine the effect on the magnetic? The revisions took five years to complete. A one-year ast interval is a typical starting point suggested by gage manufacturers. This requirement makes Type 1 gages very difficult to use. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
A minimum and a maximum thickness are normally specified for each layer of coating. These steps are 1 gage calibration, 2 verification of gage accuracy and 3 gage adjustment. If necessary, the gage should be adjusted v7091 described in 7. This inverse relationship is re? Special tensioned ring shims are also available. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.