Beneficial comments, recommendations, additions, deletions, clarifications, etc. and any
data which may improve this document should be sent to: HQ AFCESA/CESC, 139
Barnes Drive, Suite 1, Tyndall AFB FL 32403-5319.
FSC 8010
Distribution Statement A. Approved for public release. Distribution is unlimited.
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
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