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. Wet film thickness is measured according to ASTM D, Standard Practice for Measurement of Wet Film Thickness by Notch Gages. Pictures. The methods for measuring surface profile are described in ASTM D, . Wet film thickness is measured in accordance with ASTM D
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Standard ASTM D The following devices are in accordance with ASTM D ZMK - Road Marking Control Kits. Specially designed for road . You can download and read online PDF Astm D Book file only if you us: epub, ebook, site, paperbook, and another formats. Here is. Standard test methods are available in ASTM D, ISO and . ASTM D outlines a standard method for this measurement. Powder.
Summary of Practice 3.
After removal from the lm, the gage is examined and the lm thickness is determined to lie between the clearance of the shortest tab wet by the lm and the clearance of the next shorter tab not wetted by the lm.
After removal from the lm, the gage is examined and the lm thickness is determined as being between the clearance of the deepest face wetted and the clearance of the next deepest notch face not wetted by the lm.
ASTM D 4417-14
Signicance and Use 4. Most protective and high performance coatings are applied to meet a requirement or specication for dry lm thickness for each coat or for the completed coating system, or for both. With some at coatings the dry lm thickness is higher than that calculated from the wet lm thickness. Consequently, the results from the notch gage are not to be used to verify the nonvolatile content of a coating.
Correction of the lm after it has dried or chemically cured requires costly extra labor time, may lead to contamination of the lm, and may introduce problems of adhesion and integrity of the coating system. Notch gages may, however, be used on nonuniform surfaces, like concrete block, that are too rough to use the 1 This practice is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of Subcommittee D Current edition approved Nov.
Published January Originally published as D Last previous edition D 84 e1.
D Interchemical and Pfund gages. Also notched gages can be very useful in the shop and eld for determining the approximate thickness of wet lms over commercial articles where size s and shape s are not suitable for measurements by other types of gages. Examples of such items are ellipses, thin edges, and corners.
Calculating and Measuring Wet Film Thickness
Report 5. Procedure 8. The gage must be used immediately following application of the coating. Some coatings lose solvents quickly and spray application increases the speed.
The resulting rapid reduction in wet lm thickness can cause misleading readings. The lm thickness is determined as being between the clearance of the shortest tab wettedd and the clearance of the next shorter tab not wetted by the lm.
Standard Practice for
Do not clean with metal scrapers. The number of readings required to obtain a good estimate of the lm thickness varies with the shape and size of the article being coated, with the operators experience, and whether one or more of the following problems are encountered: 8. However, the lm itself may show where contact was made.
When reading the gage, look at both the gage and the lm itself for verication of the reading. Ignore such readings. The spot where the gage is used must be as uniform as possible and questionable readings ignored.
Report 9. Apparatus The gauge may now be read to determine the wet film thickness. The ends of the teeth or notches are visually examined, some will be coated or 'wet' and some will not be coated or 'wet'.
The wet film thickness WFT of the coating lies between the values of the smallest un-coated dry tooth or notch and the largest coated wet tooth or notch. Be sure to clean the gauge with an appropriate solvent after use.
When wet film thickness is measured with the gauges on rough substrates, the thickness measurements made will most likely be from the surface 'peaks' and the wet film thickness measurement will represent the minimum overall wet film thickness.
On curved surfaces such as pipes, cylinders, etc. If quick drying coatings are to be measured, quickly perform your measurements to avoid errors that may be caused by curing.
Measuring Powder Coatings The thickness of dry powder coatings may also be measured with these type of gauges. The mode of operation is similar to measuring 'wet' coatings. The teeth or notches of the gauge should be 'dragged' at ninety degrees through the coating and the thickness of the powder will lie between the values of the smallest tooth or notch that has powder 'clinging' to it and the largest tooth or notch that has no powder 'clinging' from it.
Tools and Techniques for Measuring Coating Quality- Part 1, Cleaning and Painting
The substrate surface may also be examined for 'drag' marks left by the teeth or notches to confirm the values read from the notches or teeth. A 'drag' mark would indicate that the tooth or notch should have coating 'clinging' to it. Model A Gauges The gauges are precision manufactured from hardened grade stainless steel. All markings and graphics are etched and black filled. These gauges will survive harsh use, the graphics will not rub off even sanding the gauge will not remove the graphics, numbers, etc.After removal from the lm, the gage is examined and the lm thickness is determined as being between the clearance of the deepest face wetted and the clearance of the next deepest notch face not wetted by the lm.
Examples of such items are ellipses, thin edges, and corners. Replica Tape Reproducibility 7.
There is also one relatively new technique available for the non-destructive measurement of dry film thickness. One instrument manufacturer provides a gage that will measure the cumulative thickness of the galvanize-coating layers, then display the thickness of each layer separately. The specific instructions of the manufacturer need to be followed, but the following steps apply to all of the Type 2 electronic instruments: Step 1 — Use certified coated standards in the intended range of use to verify that the instrument is operating properly known as verification of accuracy.
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