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Initially the desired coating is applied in a puddle on the drawdown chart. Then the bar is placed at the top of the chart, and drawn down over the paint in order to spread it evenly along the length of the chart. Once this evenly spread paint dries, it can be tested for a variety of properties. [5]
The notches are spaced 1/16 inch (1.6 mm) apart. The applicator bar is 5 inches (127 mm) wide and leaves 3 3/8 inches (86 mm) of applied coating behind after use. After the bar is drawn down the card with the coating, a series of parallel stripes with varying film thickness will be formed.
The surface of the paint is engineered to be easily decontaminated after exposure to chemical warfare and biological warfare agents. The paint is also resistant to damage and removal by decontaminating solutions. Two-component systems (e.g. epoxy or polyester-based) are often employed. This coating is described in MIL-DTL-53072H.
english: mil-std-2161a (as), department of defense standard practice paint schemes and exterior markings for us navy and marine corps aircraft (1 may 1993) Date 1 May 1993
Drawdown cards are used for testing paints and coatings through wet film preparation.. Black and white cards are used to measure both opacity and contrast ratio.By measuring reflectance values of both parts of the card one can gain a quantitative opacity value of a paint sample.
The thou, or mil, is most commonly used in engineering and manufacturing in non-metric countries. For example, in specifying: The thickness of items such as paper, film, foil, wires, paint coatings, latex gloves, plastic sheeting, and fibers For example, most plastic ID cards are about 30 thou (0.76 mm) in thickness.
In the paint and coating industries, paint adhesion testing is often used to determine if the paint or coating will adhere properly to the substrates to which they are applied. Several tests measure the resistance of paints and coatings from substrates: cross-cut test, scrape adhesion, pull-off test , and others.
The ability to gauge thickness measurement without requiring access to both sides of the test piece, offers this technology a multitude of possible applications. Paint thickness gauges, ultrasonic coating thickness gauges, digital thickness gauges and many more options are available to test plastics, glass, ceramics, metal and other materials.