1. The outer casing is cast aluminum alloy ZL102. Adopting one-time die-casting process, the product has smooth surface, beautiful appearance, high density of internal structure of metal, no defects such as bubbles and blisters, strong impact resistance, good explosion- proof performance, and permanent permanent “Ex” explosion-proof mark on the product.

2. After the surface of the product is processed by high-speed shot blasting and other series of processes, the advanced automatic high- pressure electrostatic spray and heat-curing line technology is adopted. The plastic layer formed on the surface of the shell has strong adhesion and is not easy to fall off, effectively achieving the purpose of protecting the shell. Improve the anti-corrosion ability of the product.

3. The inner surface of the bell bowl is ruthenium-plated bronze, and the outer surface is chrome-plated. When it hits, it will not produce sparks. The ringing is loud and pleasing, and the distance is long.

4. All exposed fasteners are made of stainless steel.

1. According to the model implication's rules to select regularly, and Ex-mark should be added behind model implication;

2. If there are some special requirements, it should be pointed as ordering.