MAK SEAL

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

MAK SEAL features a high-viscosity polymer matrix reinforced with fine fibers, forming a stable sealing barrier that prevents water ingress even under high pressure. This helps protect the TBM tail seal system and supports stable machine operation.

MAK SEAL is suitable for a wide range of tunneling methods and TBM types, including large-diameter projects. It performs reliably in demanding conditions, such as high-pressure subsea and river-crossing tunnels.

Product Range

Product	Application
MAK SEAL 230	Initial Filling Stage
MAK SEAL 270	Main TBM Operation (Subtropical Conditions)
MAK SEAL 260	Main TBM Operation (Temperate Conditions)
MAK SEAL Z-01	High Water Pressure Conditions

Package

25 kg, 70 kg, 250 kg Drum

Product Performance Data

High Water Pressure Resistance

Withstands water pressure of 35 bar (3.5 MPa) or higher (Z-01: 45 bar (4.5 MPa) or higher)
Excellent Pumpability

Stable and reliable pumping performance (Typical delivery rate: 40-60 g/min at 25℃)
Self-Extinguishing

Self-extinguishes within 5 seconds after flame removal
Biodegradability

Tested and verified according to OECD 301B standard
Thermal & Water Stability

Maintains performance under 80-90°C water conditions
Anti-Sagging Performance

Maintains adhesion for over 30 hours on vertical surfaces without flow
Non-Hardening behavior

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

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