We have just launched the new iPhone 5S cases that are intrinsically safe. the iPhone 5S cases are rated IP67 which is water and dust proof. The intrinsically safe rating is Class 1, Division 2.
Intrinsic safety (IS) is a protection technique for safe operation of electrical equipment in hazardous areas by limiting the energy available for ignition.
The iPhone 5S cases comes with a special rubber cases and a ballistic nylon case and it is the combination of these two materials and products that makes it intrinsically safe.