Shield Tail Seal Grease

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Shield tail seal grease is the most consumed consumable in shield tunnelling. It fills the gaps between wire brushes at the shield tail, forming a continuous grease seal between the segment exterior and the shield tail interior, preventing groundwater, grout and soil from entering the tunnel.

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Product Overview

Shield tail seal grease is the most consumed consumable in shield tunnelling. It fills the gaps between wire brushes at the shield tail, forming a continuous grease seal between the segment exterior and the shield tail interior, preventing groundwater, grout and soil from entering the tunnel.

HDC-DWYZ series uses polymer and composite fiber reinforcement system. Synthetic fibers form a 3D network within the grease, combined with high-adhesion base oil, providing excellent water-wash resistance under high water pressure. Available in pumpable grade (DWYZ-01) and trowel grade (DWYZ-02).

Applicable Equipment

Earth Pressure Balance (EPB) TBM

Slurry TBM / Mixshield

Hard Rock TBM (Single/Double Shield)

Pipe Jacking Machine & Micro TBM

Packaging & Storage

Model

Packaging

Shelf Life

Notes

HDC-DWZ-01

250 kg Iron Drum

12 months

Store in cool, dry place, away from direct sunlight and rain
Use after opening as soon as possible; reseal unused portion

Technical Specifications

DWYZ-01 Pumpable Grade

Test Item	Specification	Test Method
Appearance	Yellow fibrous paste	Visual
Density (25℃)	1.25～1.50 g/cm³	GB/T 13477.2- 2018
Cone Penetration (25℃, 0.1 mm)	180-210	GB/T 269-2023
Pumpability	25～75g/min	T/CC 8-2023 Appendix A
Water-pressure Sealing Performance (3.5 MPa)	Grade A	T/CC 8-2023 Appendix B
Adhesion Property	≥70s	Enterprise Internal Control Test Method
Water Wash-out Resistance	≤50mm	Enterprise Internal Control Test Method
Spreading Uniformity	≥85%	Enterprise Internal Control Test Method

DWYZ-02 Trowel Grade

Test Item	Technical Index	Test Method
Appearance	Yellow fibrous paste	Visual
Density (25℃)	1.25～1.50 g/cm³	GB/T 13477.2-2018
Unworked Cone Penetration (25℃, 0.1 mm)	190～220	GB/T 269-2023
Pumpability (g/min)	—	T/CC 8-2023 Appendix A
Water-pressure Sealing Performance (3.5 MPa)	Grade A	T/CC 8-2023 Appendix B
Adhesion Property	≥150s	Enterprise Internal Control Test Method
Water Wash-out Resistance	≤50mm	Enterprise Internal Control Test Method
Spreading Uniformity (%)	—	Enterprise Internal Control Test Method

Key Advantages

• Excellent water-wash resistance

Water wash-off ≤3–5% at 38°C, stable seal at 6 bar
• High metal adhesion

Adhesion rate ≥95% (P) / ≥98% (T)
• Fiber-reinforced structure

Synthetic fibers form 3D skeleton, anti-extrusion
• Wide temperature range

10°C to +60°C
• Smooth pumpability

Min at 25°C, 0.5 MPa, no blockage
• Eco-friendly formula

Chlorine-free, heavy metal-free, biodegradable base oil
• Cost-effective

30–50% lower than imported brands at equivalent performance
• Proven track record

Proven track record

Application Guide

Step 1: Initial Filling (1st Fill)

● Before TBM launch, manually fill all gaps between wire brush rows with WR-89T trowel grade. This is the foundation of the sealing system. Any voids left during initial filling will be enlarged by water pressure during excavation.

● Fill between each brush row thoroughly, no blind spots

● Reference: 25–40 kg per brush row, depending on TBM diameter

● Inspect each row after filling, confirm no voids before assembly

Step 2: Continuous Injection During Excavation

● During TBM advance, continuously pump WR-89P into the shield tail gap via automatic grease pump. The grease is pressed into brush gaps under pressure, merging with the initial WR-89T fill to form a continuous dynamic seal.

● 0.2–0.5 MPa / Injection pressure: 0.2–0.5 MPa above external water/grout pressure

● Dosage: 8–15 kg per ring, depending on diameter and ground conditions

● Caution: Monitor injection pressure continuously; sudden pressure drop may indicate brush deformation or damage

● Increase fiber content grade for high-permeability ground

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