A Multicoat Non-Burnable Protection System for Electrical Elements

An approach to the problem of the non-ignitable and moisture resistant protective coating for electrical elements that use a double layer of coating composed of two different materials was investigated. The two materials are different in terms of the protection which they provide to the element. The first coating is truly non-burnable, inert, and is permeable to moisture, while the second coating is burnable and is nonpermeable to moisture. The important feature of the multicoat system introduced here is the particular effect of the burnable layer on the ignitability of the system. It has been experimentally demonstrated that as the thickness of either layer is increased, the ignitability of the system decreases. The system may be designed such that no flame appears on the surface of the assembly under any conditions and yet the electrical element is well protected against moisture.