Most GRP enclosures are manufactured to a degree of weather, water and intrusion protection and it is the client who determines the level necessary for the GRP enclosure. These levels (IP levels) are then included in the design and manufacturing according to the clients specifications.
The IP (or Ingress Protection) ratings are defined by the international standard EN 60529 (British BS EN 60529:1992). The IP level of your GRP enclosure is to determine how much of the sealing effectiveness is against moisture and the intrusion from foreign bodies, weather etc…
The IP level is much higher in a GRP enclosure when housing electrical equipment. There are numbers that follow all IP ratings and these have a specific meaning relating to the degree of sealing and protection effectiveness.
The IP rating for a GRP enclosure covers a range of waterproof elements from condensation to prolonged immersion in water under pressure. Enclosures that are constantly immersed in water would need to be totally waterproof and should therefore carry an IP rating of IP68. Where enclosures are immersed temporarily at certain times they should carry a lesser rating of IP67.
For instance if your GRP enclosure was IPO rated this would signify that no special protection was included when the enclosure was designed and manufactured.
Then there is the weatherproof GRP enclosure, and the customer has to determine how much protection from the environment it will need in the IP rating chart.
GRP Adept can give all their clients advice on the levels of the IP ratings based on their expertise and experience accumulated over the years working with many industries requiring GRP enclosures.