Greases

MAIN BEARING GREASE

Main bearing grease is used for lubrication and oil insulation purposes in tunnel boring machines.

It is formulated to withstand high water pressure and ground pressure.It effectively protects the main bearing and prevents material transfer from the excavation elements to the main bearing, while lubricating moving parts.

Advantages

• It has excellent adhesion properties to all surfaces, preventing leaks in humid or salty environments.

• Its structure remains intact under high pressure.

• Suitable for use with rotating parts in the TBM.

FIRST FILLING GREASE

First filling grease is used for the first filling tail grease for new brush systems in tunnel boring machines. It is formulated to withstand high water pressure and ground pressure. It has excellent pumpability and adhesion properties to all surfaces.

Advantages

• Excellent insulation properties

• Excellent adhesion capability to all metal and concrete surfaces.

• Excellent pumpability

TAIL SEALANT GREASE

Tail sealant greases are continuously injected between the brush rows to seal the tail brush system, protecting the TBM from soil, water, grout, or dust infiltration.

Advantages

• Provides effective insulation against water, soil, or mass passage in the gap between shield and concrete segments.

• Formulated to withstand high water pressure and ground pressure.

• Excellent adhesion to metal or concrete surfaces.

• Excellent pumpability.

• Effective in protecting metal parts from corrosion.

• High resistance to washing and spraying with water.

• Length and density of fibers are optimized.

• Filler value is optimized to increase consistency.