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HydroBond 403

Newton HydroBond 403 is a high-performance, self-healing, composite sheet membrane, with exceptional waterproofing capabilities. When fitted above the raft support or to wall formwork, the locking fleece is encapsulated into the newly placed concrete, becoming fully-engaged to prevent water from tracking.

If the waterproof LDPE layer is punctured, the exposed hydrophilic coating expands, preventing water ingress, effectively sealing small holes that may be accidentally formed during fixing of the reinforcing steel or the placing and compaction of the concrete.

HydroBond 403 is a component of the HydroBond® System that also includes post-applied waterproofing membranes, protection and drainage boards, providing a complete waterproof envelope to the structure to achieve Type A (barrier) waterproofing suitable for Grades 1, 2 and 3 as defined by BS 8102:2022. The HydroBond System is suitable for all below-ground and earth-retained structures from domestic basements to the largest civil engineering projects.

Correctly protected, the Newton HydroBond System will provide, under normal service conditions, a durable waterproof barrier for the life of the building to which it is installed; the expected lifetime of the building itself should be at least 60 years. The Newton HydroBond system is supported by BDA Agrément Certificate BAB 17-031/04/A and is accepted by the NHBC as a suitable waterproofing system for Type A Waterproofing to Grades 1, 2 & 3 according to BS 8102:2022.

  • Key Benefits
  • Typical Applications
  • Suitable Substrate
  • Technical Data
  • Key Benefits

    Key Benefits

    • Agrément certificated and NHBC accepted waterproofing system
    • Full mechanical bond to concrete prevents water migration between membrane and structure
    • Hydrophilic layer provides self-healing of punctures to the membrane
    • Very flexible – Resistant to movement and fissures in substrates
    • The HydroBond System completely surrounds the structure
    • Excellent resistance to the high alkalinity of concrete

    Typical Applications

    Typical Applications

    • As a continuous membrane to permanent raft and wall formwork such as the raft blinding and piled walls of reinforced concrete earth-retained structures.

    Suitable Substrate

    Suitable Substrate


    • Concrete blinding
    • Compacted type 1 hardcore
    • Compacted sand

    The following can be placed above the blinding or hardcore prior to the installation of HydroBond 403:


    • Existing structure
    • Secant or contiguous concrete piles
    • Metal sheet piles
    • Diaphragm walls
    • King post wall
    • Sufficiently stable ground such as clay or chalk
    • Temporary timber shuttering/formwork

    Technical Data

    Technical Data

    Installed Performance Results
    Service temperature -40ºC to +100ºC
    Adhesion to concrete 0.4 N/mm²
    Elongation at break (Machine) 20%
    Elongation at break (Traverse) 50%
    Tensile strength (Machine) >250 N/50 mm
    Tensile strength (Traverse) >200 N/50 mm
    Resistance to static loading – 20 kg load Watertight
    Resistance to impact – AI plate – 200 mm drop Watertight
    Resistance to impact – EPS panel – 500 mm drop Watertight
    Joint strength – Glued seam >100 N/50 mm
    Resistance to tearing – Nail shank – MD** >150 N
    Resistance to tearing – Nail shank – Across >150 N
    Resistance to fire Euroclass E
    Water vapour diffusion resistance – Sd value 68m

    Speak to our friendly, expert team

    Our staff are able to provide guidance for projects of all sizes, whether you require some general advice about damp or waterproofing, or support with technical drawings and specifications.

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