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HydroBond 403

  • Self-Healing Technology: HydroBond 403 features a self-healing composite sheet membrane that automatically seals small punctures, ensuring continuous waterproofing protection.
  • Full Engagement with Concrete: The locking fleece becomes fully integrated into newly placed concrete, preventing water from tracking and ensuring long-term durability.
  • Comprehensive System Integration: As part of the HydroBond® System, HydroBond 403 offers complete waterproofing solutions, including post-applied membranes and drainage boards, suitable for various below-ground and earth-retained structures.
  • Certified Durability: Supported by BDA Agrément Certificate and accepted by NHBC, HydroBond 403 provides a durable waterproof barrier for the life of the building, with an expected lifespan of at least 60 years.
  • Effective radon barrier: To the performance requirements of BR211:2023.

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
    • Effective radon barrier to the performance requirements of BR211:2023.

    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

    RAFT OR SLAB

    • 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:

    WALL FORMWORK

    • 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

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    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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      We will be closing between Christmas and New Year, with the last day of operations being Friday 20th December. Last orders for delivery before Christmas therefore need to be placed by 2pm on Thursday 19th December, with final deliveries on Friday 20th December. After this, no deliveries will be possible until January 2025. The Newton branches in Tonbridge and Leeds will reopen in the New Year on Thursday 2nd January 2025.