A flameproof enclosure is capable of withstanding an internal explosion of flammable mixtures that penetrate into the enclosure through any joint surface or structural gap of the enclosure without being damaged, and it will not ignite the external explosive atmosphere formed by one or more types of gases or vapors.

This is achieved in two ways:

First, through the robust anti-explosion performance of the flameproof enclosure. Even if an internal explosion occurs, the enclosure will not be damaged.

Second, through the appropriately sized length and width of the joint surface of the flameproof enclosure. This is also known as the flame extinguishing passage. A flameproof enclosure is not completely sealed; there is a unique flame extinguishing passage between the interior and exterior of the enclosure. After the flame generated by the internal explosion passes through this passage, it is already extinguished, or the energy transmitted outward is insufficient to ignite the hazardous substances outside the enclosure, thereby achieving explosion-proof safety.

Therefore, the enclosures of general flameproof equipment are required to have anti-explosion and explosion-resistant performance, and common materials include aluminum alloy, cast iron, cast aluminum, stainless steel, etc.

It is difficult for plastic materials to meet the above requirements.

However, it is possible to use a plastic enclosure for flameproof equipment, provided that the relevant requirements of explosion-proof testing are met, such as heat and cold resistance tests, surface resistance tests, light resistance requirements, and for Category I equipment, requirements for resistance to emulsified liquids.

For more information on explosion-proof knowledge, please directly contact STS!