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TT-B-1325D
BEADS (GLASS SPHERES) RETRO-REFLECTIVE
Year: 2007
Abstract: This specification covers three types of retro-reflective beads used to reflectorize traffic and airfield marking paints. Intended Use: Type I, Gradation A, coarse - low-index recycled glass beads for drop-on applications are intended for marking highways and all airfield markings. Type I, Gradation B, fine - low-index glass beads for premixed paint are intended for marking highways, or for use in applying temporary airport or airfield markings. Type III - high index glass beads for drop-on applications are intended for applications where increased retro-reflectivity is needed. NOTE: The increased retro-reflective values obtained from use of high index of refraction glass beads are only apparent to the observer in cases where the observer's line of sight is in close proximity to the path of the light source used to illuminate the markings. Studies by the USAF and the Federal Aviation Administration have shown that in cases where the light source is not in close proximity to the viewer's eye position, the added benefit from the use of the higher index of refraction beads is negligible. Type IV Gradation A – Large coarse, direct-melt, low-index glass beads for dropon applications are intended for highways and all airfield markings. Type IV Gradation B – Medium coarse, direct-melt, low-index glass beads for drop-on applications are intended for highways and all airfield markings.
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| contributor author | AIR FORCE - 69 - Air Force Packaging Technology and Engineering Facility (AFPTEF) | |
| date accessioned | 2017-09-04T18:48:13Z | |
| date available | 2017-09-04T18:48:13Z | |
| date copyright | 08/06/2007 | |
| date issued | 2007 | |
| identifier other | KOCTACAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std/handle/yse/229430 | |
| description abstract | This specification covers three types of retro-reflective beads used to reflectorize traffic and airfield marking paints. Intended Use: Type I, Gradation A, coarse - low-index recycled glass beads for drop-on applications are intended for marking highways and all airfield markings. Type I, Gradation B, fine - low-index glass beads for premixed paint are intended for marking highways, or for use in applying temporary airport or airfield markings. Type III - high index glass beads for drop-on applications are intended for applications where increased retro-reflectivity is needed. NOTE: The increased retro-reflective values obtained from use of high index of refraction glass beads are only apparent to the observer in cases where the observer's line of sight is in close proximity to the path of the light source used to illuminate the markings. Studies by the USAF and the Federal Aviation Administration have shown that in cases where the light source is not in close proximity to the viewer's eye position, the added benefit from the use of the higher index of refraction beads is negligible. Type IV Gradation A – Large coarse, direct-melt, low-index glass beads for dropon applications are intended for highways and all airfield markings. Type IV Gradation B – Medium coarse, direct-melt, low-index glass beads for drop-on applications are intended for highways and all airfield markings. | |
| language | English | |
| title | TT-B-1325D | num |
| title | BEADS (GLASS SPHERES) RETRO-REFLECTIVE | en |
| type | standard | |
| page | 8 | |
| status | Active | |
| tree | AIR FORCE - 69 - Air Force Packaging Technology and Engineering Facility (AFPTEF):;2007 | |
| contenttype | fulltext |