The shape of plate products is flat, the width thickness ratio is large, and the surface area per unit volume is also large.

Pipe is the material used to make pipe fittings. Different pipes should be used for different pipe fittings, and the quality of pipes directly determines the quality of pipe fittings.

Special shaped seal, also known as special-shaped part, is a rubber seal with special-shaped cross-section except circular and rectangular cross-section.