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ASTM International has revised two standards relating to traffic paint: D868 - Standard Test Method for Evaluating Degree of Bleeding of Traffic Paint and D1155 - Standard Test Method for Roundness of Glass Spheres.
D868: Evaluating Bleeding of Traffic Paint
Solvents in traffic paint may cause bleeding of pavement constituents into the traffic marking, rendering the marking less effective as a lane or directional indicator. This practice describes how to prepare a panel of the coating to be tested and a reference panel coated with a specific solvent-borne traffic paint to be used as a control for evaluation.
This practice can be particularly useful for evaluation of solvent-borne traffic paints, but it may also be used for other types of traffic markings including waterborne traffic paints.
Two basic procedures are described for measuring the amount of bleeding. The procedure used shall be agreed upon by the purchaser and seller.
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D1155: Testing Roundness of Glass Spheres
The roundness of glass spheres is one measurable aspect relating to their performance as a retroreflective media. The function of this test method is to measure the percent of true spheres as related to compliance with applicable specifications.
This test method includes two procedures:
• 1.2.1 Procedure A, in which the selected specimen is split into two size ranges or groups prior to separation into true spheres and irregular particles; and
• 1.2.2 Procedure B, in which the selected specimen is split into five size ranges or groups prior to separation.
In determining compliance with specification requirements, either procedure may be used. Where tests indicate failure to meet the specified percent of true spheres and irregular particles, the referee test shall be made in accordance with Procedure B.
Note: This method has been used in other industrial areas outside the intended scope of this test method.
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