Tail Seal Grease

Products

Tail Seal Grease

MAK SEAL is a high-performance Tail Seal Grease (TSG) developed to provide both reliable water sealing and smooth lubrication in shield TBM operations.

Its structure consists of a high-viscosity polymer matrix reinforced with fine fibers, forming a stable sealing barrier that effectively prevents water ingress even under high water pressure conditions. This ensures continuous protection of the TBM tail seal system and stable machine operation.

MAK SEAL can be widely applied to various tunneling methods, TBM types, and large-diameter tunnel projects. It delivers proven performance in demanding environments, including high-pressure sections such as subsea and river-crossing tunnels.

Product Type

Product	Product Overview
MAK SEAL 230	For initial filling
MAK SEAL 270	For main driving (Subtropical Region)
MAK SEAL 260	For main driving (4-Seasons Region)
MAK SEAL Z-01	For high-water pressure resistance

Package

25kg, 70kg, 250kg Steel Open Drum

Product Performance Data

High Water Pressure Resistance

Withstands up to 35 bar (3.5 MPa) water pressure (Z-01 type: up to 45 bar / 4.5 MPa)
Excellent Pumpability

Stable and reliable pumping performance (Typical delivery rate: 40-60 g/min)
Self-Extinguish Capability

Automatically reseals within 5 seconds after contact separation
Biodegradability

Tested and verified according to OECD 301B standard
Stability under water

Maintains physical properties under 80-90°C high-temperature conditions
Anti-Flow Stability

Maintains original adhesion for over 30 hours on vertical surfaces
Non-Hardening behavior

Remains non-hardening even when mixed with backfill materials
Optimized Density & Consistency

Specifications can be adjusted according to TBM type and ground conditions.