One of the earliest hiding power test surfaces was linoleum with a black and white checkerboard pattern. This was soon replaced by sealed paperboard charts of which Forms 10H and 10H-BG Spreading Rate Charts are typical examples.
Designed for brush out tests at specified rates, such as in ASTM Method D 344 and Canadian 1-GP-71, they are also used for drawdown applications like their similar counterparts Forms 10A and 10B.
Black and grey squares in Form 10H-BG provide reduced contrast for testing coatings with lower hiding power.
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Checkerboard Charts/Spreading Rate Charts | Elcometer 4695 Information
Overview
One of the earliest hiding power test surfaces was linoleum with a black and white checkerboard pattern. This was soon replaced by sealed paperboard charts of which Forms 10H and 10H-BG Spreading Rate Charts are typical examples.
Designed for brush out tests at specified rates, such as in ASTM Method D 344 and Canadian 1-GP-71, they are also used for drawdown applications like their similar counterparts Forms 10A and 10B.
Black and grey squares in Form 10H-BG provide reduced contrast for testing coatings with lower hiding power.
