TT-B-1325D

                                                                                 INCH-POUND
                                                                                 TT-B-1325D
                                                                                 06 August 2007
                                                                                 SUPERSEDING
                                                                                 TT-B-1325C
                                                                                 June 1, 1993
                              FEDERAL SPECIFICATION
                   BEADS (GLASS SPHERES) RETRO-REFLECTIVE
The General Services Administration has authorized the use of this federal specification by all federal agencies.
1. SCOPE AND CLASSIFICATION.
1.1 This specification covers three types of retro-reflective beads used to reflectorize traffic and airfield marking paints.
1.2 Classification.
1.2.1 Type I - Low Index of Refraction recycled glass (fire-polished process)
Gradation A (Coarse, Drop-on)
Gradation B (Fine, Premix)
Type II - Deleted
Type III - High Index of Refraction
Type IV - Low Index of Refraction direct melt glass (molten glass kiln process)
Gradation A (Large Coarse, Drop-on)
Gradation B (Medium Coarse, Drop-on)
2. APPLICABLE DOCUMENTS.
2.1 Government Publications. The issues of the following documents, in effect on date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein.
FEDERAL LANDS, HIGHWAY
T 520-93 – Determining the Roundness of Large Glass Beads
FEDERAL STANDARDS