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    ​​​MasterRoc® TSG 870

    Fire Resistant First Fill Tail Sealant for Shielded Tunnel Boring Machine (TBM)

    ​​​How does MasterRoc TSG 870 work?

    ​​MasterRoc TSG 870 is a fire-resistant first-fill tail sealant that effectively seals the gap between the shield tail and the concrete segments to prevent the ingress of water, grout, and soil. MasterRoc TSG 870 sealant is formulated as a "first fill" product to resist high water and ground pressures. It has excellent adhesion to all types of surfaces.​

    Recommended Use:

    Tunneling with shielded TBM equipped with a tail brush seal system

    What are the unique features of MasterRock TSG 870?

    • Fire resistant
    • Excellent sealing properties
    • Excellent pumping properties
    • Excellent adhesion to metal or concrete surfaces
    • Very high washout resistance
    • Non-miscible with annulus grout​

    What are the benefits of MasterRock TSG 870?

    • Prevents the ingress of soil, water or grout into shielded TBM
    • Does not propagate flames when exposed to sparks or flames​

    Direct contact

    Master Builders Solutions Technical Support

    Admixture Systems

    1-800-628-9990

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    Related Literature

    MasterRoc TSG 870 Data Guide

    pdf (250.10 Kb)

    MasterRoc TSG 870 SDS

    pdf (322.23 Kb)

    MasterRoc TSG 870 SDS

    pdf (334.06 Kb)

    MasterRoc TSG 870 SDS

    pdf (191.91 Kb)