AASHTO T 346

Description / Abstract: 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:

Section 3, Sampling Glass Beads during Production;

Section 4, Sampling Shipments of Glass Beads Vertically from Bulk Containers;

Section 5, Gradation;

Section 6, Roundness;

Section 7, Refractive Index;

Section 8, Flow Characteristics Test—Referee Method;

Section 9, Moisture Resistant Coating Test—Referee Method;

Section 10, Flotation Test—Referee Method;

Section 11, Adherence Coating Oven Test—Referee Method;

Section 12, Alternative Flotation Test—As Permitted by Purchasing Agency;

Section 13, Alternative Moisture Resistance Test—As Permitted by Purchasing Agency; and

Section 14, Alternative Adherence Test—As Permitted by Purchasing Agency.

The values stated in SI units are to be regarded as the standard.

This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety concerns associated with its use. It is the responsibility of the user of this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.