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Shell Processing

What Is Radial Shaft Seal Shelling?

Radial shaft seal manufacturing includes "shelling"— or creating the outer housing of a radial shaft seal. Shells are made from robust and durable materials such as steel to withstand the forces applied to them during operation.

Radial shaft seal shell manufacturing is a complex process that requires precision and attention to detail to produce strong, durable, and reliable shells. They help to prevent leaks and contamination, and they extend the life of the application.

What Is Radial Shaft Seal Shell Phosphating?

Shell phosphating is a process used to improve corrosion resistance and wear resistance. It is a standard process in manufacturing radial shaft seals, as it helps protect the seal from the harsh environment in which it operates.

ESP uses the phosphating process to improve parts' corrosion and wear resistance. The phosphating process involves the following steps:

S. No. Station No. Tank Name (For Labeling) Remarks
1 Station-1 Loading Station --
2 Station-2 Degreasing Tank-1
3 Station-3 Water Rinse-1 Tank-2
4 Station-4 Water Rinse-2 Tank-3
5 Station-5 Derusting Tank-4
6 Station-6 Water Rinse-3 Tank-5
7 Station-7 Empty Tank-6
8 Station-8 Activation Tank-7
9 Station-9 Phosphating-1 Tank-8
10 Station-10 Phosphating-2 Tank-9
11 Station-11 Water Rinse-4 Tank-10
12 Station-12 Water Rinse-5 Tank-11
13 Station-13 Passivation Tank-12
14 Station-14 Oven Tank-13
15 Station-15 Unloading Station --

What Are The Benefits Of Using Shell Phosphating In Radial Shaft Seal Manufacturing?

  • Improved corrosion resistance: The shell phosphating process creates a thin layer of zinc phosphate on the radial shaft seal shell's surface, providing excellent corrosion resistance. This is important in applications where the seal will be exposed to harsh environments, such as high temperatures, corrosive chemicals, or moisture.
  • Improved wear resistance: The shell phosphating process also creates a hard, wear-resistant layer on the surface of the shell. This helps to protect the seal from wear and tear, which can extend the life of the seal.
  • Reduced maintenance costs: The shell phosphating process can help reduce maintenance costs by extending the seal's life. The seal is less likely to corrode or wear out, replacing less often.

What Is Radial Shaft Seal Bonding?

The shaft seal bonding is to apply a coat of bonding agent over the phosphated shells to “bond” the rubber and metal. Different rubber compounds requires different bonding agents and ESP precisely picks the right bonding agent. ESP uses a non destructive layer check method to test the coating thickness of both the phosphating thickness and the bonding agent thickness.

Shell Processing Phospating


Optional - De-rusting process

Cycle time of 20 minutes

2 transporters / 3 immersion buckets

Henkel chemicals

Shell Processing Bonding


Tung Yu full dip bonding agent station

Bonding chemicals from Chemlok