Main Bearing Grease CTR-MBG-EP1/CTR-MBG-EP2 — CENTOR Underground System Solutions

Shield Machine Consumable · Pump-type

Main Bearing Grease

Models CTR-MBG-EP1 / CTR-MBG-EP2

An eco-friendly dedicated sealant for the main bearing sealing system of lip-seal structured shield boring machines. Used as a consumable sealant via the centralised pump-distribution system, it prevents mud and water from penetrating the sealing system while producing no pollution to groundwater or soil.

Available in two grades (EP1 and EP2) to suit different operating conditions. The Record HBW series formulation delivers black homogeneous paste with fiber-supported cohesion, excellent metal surface adhesion, and proven pumpability through centralised distribution lines. Biodegradable and non-toxic — suitable for environmentally sensitive project sites where groundwater protection is a compliance requirement.

At a Glance

AppearanceBlack homogeneous paste

Density1.25±0.05 g/cm³

Penetration230–280 (1/10mm)

Adhesion>48 min

Pumpability30–60 g/min

FlammabilitySelf-extinguishing

EcoBiodegradable

Specifications — Record HBW Series

Technical Data

Property	Value	Test Method
Appearance	Black homogeneous paste	Visual
Density	1.25±0.05 g/cm³	ASTM D1289
Cone Penetration	230–280 (1/10mm)	ASTM D217
Adhesion / Liquidity	>48 min	JISA 5758
4-Ball Grinding (1h / 40kg)	<0.9 mm (wear scar diameter)	—
Pumpability	30–60 g/min	NF T60-139
Flammability	Self-extinguishing	—
Biodegradability	Biodegradable	—
Environmental Impact	Non-toxic — zero groundwater/soil pollution	—
Application	Centralised pump-distribution system	—
Available Grades	EP1, EP2	—

Performance

Key Benefits

Excellent metal surface adhesion — bonds tenaciously to sealing lip surfaces, maintaining a continuous barrier against mud and water intrusion during dynamic bearing operation.

Good shear stability in wet environments — fiber structure and homogeneous paste consistency maintain product integrity under repeated mechanical shear from rotating sealing elements.

Uniform cavity filling via pump — pumpability of 30–60 g/min ensures consistent, void-free delivery through centralised distribution lines to all sealing positions.

Strong cohesion & fiber structural support — fiber network resists displacement under differential pressure and prevents gap formation at the seal-bearing interface.

Flame retardant & self-extinguishing — automatically extinguishes when ignition source is removed, meeting tunnel fire safety requirements.

Non-toxic, biodegradable, zero pollution — environmentally inert formulation eliminates groundwater and soil contamination risk, simplifying project environmental compliance.

Application & Logistics

Application & Storage

Application Method

Distributed via centralised pump system on the TBM
Automatically metered to main bearing sealing positions
Continuous replenishment during driving to maintain seal
Available in EP1 and EP2 grades for different operating conditions
Contact us for grade selection guidance based on TBM specification

Storage & Classification

Store at ambient conditions — cool, dry, out of direct sunlight
Keep containers sealed when not in use
Contact us for packaging options and drum sizes
Biodegradable — no special environmental disposal requirements
Not classified as hazardous under EU CLP

Get in Touch

Request a Quote or Technical Consultation

Our team will review your TBM specifications and ground conditions to confirm product suitability and provide application parameters.

Main Bearing Grease — CTR-MBG-EP1 / CTR-MBG-EP2

Main Bearing Grease

Technical Data

Key Benefits

Application & Storage

Related Products

Request a Quote or Technical Consultation