The PSPA is the Photoluminescent Safety Products Association. Members share the objectives of promoting the use of quality photoluminescent products and materials in safety applications and setting, monitoring and maintaining quality standards.

The PSPA has developed a classification system for photoluminescent products and materials. This classification is used to determine the subsequent application of products in escape route marking systems.

Luminance decay mcd/m2		2 mins	10 mins	30 mins	60 mins	Time to 0.3mcd/m2
Class III	>		8.5	1.5	0.5	>80 minutes
Class II	>		12.5	2.9	1.2	>170 minutes
Class I	>		17	4	1.7	>240 minutes
Class A		108	23	7	3	>450 minutes

As a result of innovative new pigments being introduced and processed, three further classifications are proposed for materials that are currently available in the market. These materials all exceed Class I performance and are hence considered special cases of this class and are as follows:-

Luminance decay mcd/m2		2 mins	10 mins	30 mins	60 mins	Time to 0.3mcd/m2
Class B	>	210	50	15	7	>900 minutes
Class C	>	690	140	45	20	>1800 minutes
Class D	>	1100	260	85	35	>2000 minutes

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