PHOTOLUMINESCENT POWDER INTRODUCTION
Photoluminescent powder, also known as pigment, is a non-toxic, non-radioactive new environmentally friendly alkaline earth aluminate pigment. Most of the visible or UV light will charge the pigment particles (excitation). The photo luminescent pigment then releases energy for 10 to 24 hours in the form of visible light (which glows in the dark). The photographic light-emitting pigments provide duty-cycle operation with a very high ratio of glow time to the desired charging time. Luminous intensity (brightness) and afterglow time than the traditional ZnS (zinc sulfide) or usually sold retail store products more than 30 times higher.
Photoluminescent Powder Characteristics
Safe for normal uses as it contains no radioactive or toxic materials.
Long glow time. Compared with previous photo storage materials, it has up to 50 times longer emission (glow) time.
High initial brilliance. Initial luminance of up to 40,000 mcd/m2.
High durability. Long shelf life if the crystalline structure is not damaged.
Outdoor usage. Suitable for outdoor usage as it does not suffer luminance reduction even when placed under a 300-watt high-pressure mercury lamp for 1000 hours.
Stable Chemical Reaction. Not-encapsulated powder is stable as it is resistant to most anhydrous chemicals, both organic and inorganic. However, it will decompose into metal oxide and lose its luminance when brought into contact with water. Waterproof powder should be used for high water content mediums such as kids water paint. Most resin, epoxy, silicone and acrylic paints can be used with our not-encapsulated pigment and brighter pigment.
High Temperatures. The performance and brilliance remain stable under temperature of nearly 1100 degrees Fahrenheit (600℃).
No decrease in performance even when tested at temperatures of -40 degrees Fahrenheit (-40℃). High durability.
How bright are these glow products?
Many photoluminescent pigments and products manufacturers refer to the extinction time of their products, which is defined as the time required for afterglow to be reduced to 1 masb (0.032 mcd / m2, or about 100 times the human perception limit). In practice, it is very difficult, unless your eyes are completely dark to adapt, and you are in a completely dark environment.
For practical purposes, the brightness of one to two millimeters per square meter is a more appropriate limit for life safety applications, even if a smoke-free environment is assumed. Therefore, the zinc sulfide product may take 30 to 45 minutes after its excitation source is extinguished. On the other hand, the afterglow of strontium aluminate products can be seen for days or even longer. All PhotoLuminescent Powder are based on strontium aluminate.
At the other end of the time scale, strontium aluminate products can provide surprising initial afterglow. For example, four inches of square material from the magazine page can provide enough light, at least in the first minute. In addition, the microprism retroreflector and other brightness enhancement techniques can increase the brightness of the material several times.
Are Photoluminescent Exit and Egress Signs OSHA Compliant?
Most people can figure out how to exit a building in normal circumstances. But add fear and an emergency, and normal tasks suddenly become difficult. Darkness after losing power and a fire’s smoke make everything worse. This is why it’s so essential to make egress—the act of escaping a building—simple and easy. And glow in the dark exit signs that are approved by OSHA are one way of lighting the way to safety.
In this article, we look at the requirements from OSHA, NFPA, and the IBC for the listing and performance of photoluminescent signs. These mandates include the need for proper light sources, glow duration, and legibility from a distance.