The procedures for testing glass beads used in traffic markings are described in this method. This includes the method for obtaining a representative test sample, preparation of the test specimens, and performing the specified tests.
This test method is divided into the following parts:
- Sampling Glass Beads During Production;
- Sampling Shipments of Glass Beads Vertically from Bulk Containers;
- Gradation;
- Roundness;
- Refractive Index;
- Flow Characteristics Test—Referee Method;
- Moisture Resistant Coating Test—Referee Method;
- Flotation Test—Referee Method;
- Adherence Coating Oven Test—Referee Method;
- Alternative Flotation Test—As Permitted by Purchasing Agency;
- Alternative Moisture Resistant Coating Test—As Permitted by Purchasing Agency; and
- Alternative Adherence Test—As Permitted by Purchasing Agency.
This standard was formerly designated as provisional standard TP 97.
