ZONE 1 AREAS - these are defined as areas in which an explosive atmosphere is likely to occur in normal operation. In these areas only Zone 1 rated materials are acceptable. However, there are other areas within industrial and manufacturing processes that represent a greater than usual risk of fire or hazard from electrical or chemical contact or in 'clean' environments associated with food and hi-tec manufacture. When safe access is required in these areas in the course of production or maintenance tasks, the use of GRP products is highly recommended.