![]() Spreading Rate Charts - Designed for visually comparing hiding power and calculating coating spreading rate.Ĥ. Penopac Charts - Penetration and opacity testing combined in one simple chart.ģ. Opacity Charts - comprised of simple combinations of black and white areas with ample space for reflectance measurement to test hiding power.Ģ. All the familiar drawdown charts are available in the byko-chart family (Figures 7-12).ġ. industry best moisture resistance during storage andįigures 9-12.most consistent color and gloss values in the industry.Our charts set high standards for the most desirable features in drawdown charts: To prevent blocking, BYK-Gardner wraps each box of byko-charts with a protective film that guards against humidity in the warehouse and during shipment.īYK-Gardner has solved all these serious problems with our byko-chart family of charts. The byko-charts passed the test and the competitive charts failed. BYK-Gardner had an independent laboratory conduct a test on our charts and the competitive drawdown charts using the ASTM D 4926 method. ![]() Charts can stick together, causing the coatings to be pulled off when attempts are made to separate the charts.ĪSTM D 4946 is a procedure to test for blocking (resistance of surfaces to stick together). ![]() For instance, in the hot, humid days of summer, boxes of drawdown charts that are stacked in a warehouse or a delivery truck can quickly deteriorate, making them totally unusable. Storage Drawdown chart storage has also been found to be a serious problem when less than "ideal" storage conditions are used.
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