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.