1. Waterproof hard shell with foam on sales tells you that plastic waterproof case - clear material. The waterproof hard shell with foam on sales tells you that the material of the transparent plastic waterproof box is mainly PC, polycarbonate (Polycarbonate) abbreviated as PC is a colorless and transparent amorphous thermoplastic material. Its name comes from its internal CO3 group. The main difference between the waterproof box made of this material and the waterproof box made of ABS material is that it is transparent.

2. Metal waterproof box - iron or stainless steel. A waterproof hard shell with foam on sales tells you that the waterproof box made of iron or stainless steel is a metal waterproof box. Compared with plastic waterproof boxes, metal waterproof boxes have stronger explosion-proof performance, anti-shock ability, and environmental adaptability.
The waterproof hard shell with foam on sales tells you that but compared with the same size waterproof box, the quality of the metal waterproof box is obviously greater than that of the plastic waterproof box, and the insulation is also poor. At the same time, the height is generally above 1M, and the cost is relatively high, so it is mainly used as a large shell. Power distribution cabinets switch boxes, etc.
Through the above introduction and analysis of the Waterproof hard shell with foam on sales, hope it helps you.