3 Series 3000-D glow-in-the-dark/ultra reflective letter D. These highly visible markers are ideal for clearly identifying electrical utility equipment such as electrical boxes, pedestals, transformers and utility poles. The numbers and letters are also optimal for facility identification and general purpose marking such as aisles, equipment, shelving and bins. The ultra reflective technology allows for maximum visibility from a greater distance, wider angle and lower light source than standard reflective vinyl, while the photoluminescent boarder gives the character distinct definition in blackout conditions. Character Height of 2". B-309 illumination characteristics is illumination 21.6 lux (2 foot-candles) for 2 hrs with a 4100k cool white fluorescent lamp, luminance (after illumination) is 10 minutes greater than 29 mcd/m2, 60 minutes greater than 7 mcd/m2, 90 minutes greater than 5 mcd/m2, 120 minutes greater than 3 mcd/m2. Adhesive type is pressure sensitive acrylic. Reflective sheeting substrate type. Standard Material Color is Silver. Black with photoluminescent border standard legend colors. Relevant standards is exceeds application requirements of type iii and iv per ASTM - D 4956. Adhesive properties are adhesion to steel (PSTC-1), 15 minute dwell average destroys, ultimate dwell (72 hour) (average) destroys. Abrasion resistance (method 5306 of u.s. federal test method standard number 191A) cs17 wheels, 1000gram Weight, legend withstands 334 cycles, Gloss (ASTM D523) 60 degree gloss on reflective area - 92 gardner gloss units gloss.