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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]
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 paint fills the grooves, and the location where a regular, significant "pepperyness" in the appearance of the coating appears, marks the coarsest-ground dispersed particles. [3] This is the point where oversized particles start to appear in high density and determines the rating for that material. [ 4 ]
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Automatic film applicators vary in their construction. The most modern types of applicators use vacuum plates to hold the drawdown cards and allow a variety of application bars to be mounted. The speed and pressure of the bar can be adjusted to allow for customization of the final film thickness. The drawdown process is governed by ASTM ...
Paint is a material or mixture that, when applied to a solid material and allowed to dry, adds a film-like layer. As art, this is used to create an image or images known as a painting.
An architectural drawing or architect's drawing is a technical drawing of a building (or building project) that falls within the definition of architecture.Architectural drawings are used by architects and others for a number of purposes: to develop a design idea into a coherent proposal, to communicate ideas and concepts, to convince clients of the merits of a design, to assist a building ...
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