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The wet film thickness of most organic coatings including paints, resins, lacquers, varnishes, gel coat, etc. See dimensional drawing below. Already Subscribed to this document.
Add to Alert PDF. Place the wet film thickness gauge at ninety degrees to the coated substrate and penetrate the surface of the coating with the notched or toothed side of the gauge until the substrate is firmly contacted. With some flat coatings the dry film thickness is higher than that calculated from ast, wet film thickness. The values given in parentheses are for information only.
Proceed to Checkout Continue Shopping. 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. 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.
Also notched gages can be very useful in the shop and field for determining the approximate thickness of wet films over commercial articles where size s and shape s are not suitable for measurements by other types of gages.
These gauges will survive harsh use, the graphics will not rub off even sanding the gauge will not remove the graphics, numbers, etc.
Consequently, the results from the notch gage are not to be used to verify the nonvolatile content of a coating. On curved surfaces such as pipes, cylinders, etc. As the voice of the U. These gauges are not designed as ‘throw-away’ items and should not be compared to asym that are ‘printed’ or silk-screened. If quick drying coatings are to be measured, quickly perform your measurements to avoid errors that may be caused by curing. The overall size of the gauges is 2.
Such a gage is applicable to coatings on flat substrates and to coatings on articles d4441 various sizes and complex shapes where it is possible to get the end tabs of the gage to rest in the same plane on the substrate. The gauges are precision manufactured from hardened grade stainless steel.
ASTM D – 95 Standard Practice for Measurement of Wet Film Thickness by Notch Gages
Always specify Stainless Steel or disposable plastic and WFT gauge number requirements in your order. All the other teeth or notches on the same side are of shorter lengths than the outside teeth or notches and represent different distances from the outside edge zero datum teeth.
This standard is not included in any packages. These gauges are also commonly known as: These gauges meet the requirements of the following International Standards: A ‘drag’ mark would indicate that the tooth or notch should have coating ‘clinging’ to it.
ASTM D – Zehntner GmbH
The mode of operation is similar to measuring ‘wet’ coatings. Notch gages may, however, be used on nonuniform surfaces, like concrete block, that are too rough to use the Interchemical and Pfund gages.
Be sure to clean the gauge with an appropriate solvent after 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. Please first log in with a verified email before subscribing to alerts. 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.
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. The gauges incorporate a series of notches cut into their sides much like the teeth on a comb.
Wait several seconds to allow the teeth or notches of the gauge to become ‘wetted’ by the coating, then withdraw the gauge vertically keeping it at ninety degrees to the substrate. Each gauge has eight different measurement notches.
How to Use a ‘Wet Film Thickness’ Gauge
The ends of the teeth or notches are visually examined, some will be coated or ‘wet’ and some will not be coated or ‘wet’. Such a gage is applicable to coatings on flat substrates and to coatings on objects of various sizes and complex shapes.
Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. Your Alert Atm lists the documents that will be monitored. Wet Film Thickness Gauges are designed to quickly and easily measure the thickness of coatings immediately after they have ast, applied to a substrate. The gauge may now be read to determine the wet film thickness. Please first verify your email before subscribing to alerts.
Wet film thickness gauges are also known as wet film gauges, notched gauges, step gauges and WFT combs. The teeth or notches are graduated in MILS 0. Standards Subsctiption may be the perfect solution. Measuring Powder Coatings The thickness of dry powder coatings may also be measured with these type of gauges. Caltech’s wet film thickness gauge is designed to measure accurate liquid coating thickness in the easiest and fastest manner.