Source of cadmium pollution

Cadmium is not as well known as mercury or lead . Cadmium is an element harmful to the human body. It is mostly in a chemical state in the natural state. The content is very low. The cadmium c.......

The basic form of explosion protection

Basic explosion-proof type
(1) Flameproof type “d” Explosion-proof type explosion-proof type is to completely enclose the parts of the equipment that may ignite the explosive gas mixture in a shell whose outer shell can withstand any joint or structura.......