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| Drawdown chart ： ウィキペディア英語版 |
Drawdown chart
Drawdown charts are rectangular pieces of non-fluorescent paper〔Feinberg, H., ''American Paint Journal'', March 31, 1980, p.45〕 which are used to test a variety of coating properties. These properties include opacity, spreading rate, penetration, and flow & leveling behavior.〔Koleske, ''Paint and Coating Testing Manual'', p. 420, ISBN 0-8031-2060-5〕 This non-fluorescent material has to be especially rugged in order to maintain its structure and give reliable readings, as the coatings tested are often corrosive or abrasive.
These charts are necessary in the testing of any coating as they give reliable and accurate readings for any type of coating before the coating is applied to the intended material.
==Drawdown bars==
Drawdown bars are used in collaboration with drawdown charts. The bars are generally made of stainless steel or aluminum and touch the chart at each end, while the center is slightly raised to a desired height in order to obtain the desired film thickness.〔Koleske, ''Paint and Coating Testing Manual'', p. 418, ISBN 0-8031-2060-5〕 As with the charts, the bars have to be especially resistant to corrosion because of the corrosive nature of some coatings.〔T.E. Patton ''Paint Flow and Pigment Dispersion'', 2nd edition. J. Wiley and Sons, New York, 1979〕 There are a multiplicity of more complicated designs including some in which the paint is already in the chart apparatus, but the bar method described above is the most commonly used.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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