LENETA - Checkerboard charts / Spreading rate charts
Checkerboard charts / Spreading rate charts
One of the earliest surfaces for testing opacity was linoleum with a black and white chequered pattern. This was soon replaced by Sealed cardboard panels of which the form 10H and 10H-BG Spreading Rate Charts are typical examples.
They were selected for the Brushout at certain application rates developed, such as the ASTM method D 344 and the Canadian 1-GP-71, but are also used for Draw down applications used, like their smaller counterparts, the moulds 10A and 10B.
The black and grey squares in Form 10H-BG offer a reduced contrast for testing coatings with low opacity.
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Form 10A Checkerboard chart
The Form 10A is a black and white sealed chessboard chart. 140 x 254 mm. -
Form 10B Checkerboard chart
The Form 10B is a black and white sealed chessboard chart. 194 x 289 mm. -
Form 10H Checkerboard Spreading Rate Chart
The Form 10H is a black and white sealed spreading rate chart with a chequerboard pattern. 286 x 438 mm. -
Form 10H-BG Chessboard Spreading Rate Chart
Form 10H-BG is a black and grey, sealed Spreading Rate Chart with a checkerboard pattern. 286 x 438 mm.
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