Newton Hydrocoat 103 2K Cementitious Waterproofing Membrane – 30kg
 
Newton Hydrocoat 103 2K is a two-component, high-adhesion cementitious waterproofing membrane designed for demanding internal and external waterproofing applications. It is suitable for basements, water-retaining structures, podium decks, balconies, car parks, plant rooms and other earth-retained or trafficable concrete structures.
 
Combined contents are 30kg, with 3.2kg/m2 coverage & 2mm membrane thickness.
 
Hydrocoat 103 2K is supplied as a liquid component (Part A) and a cementitious powder (Part B). When mixed, it forms a high-build, durable waterproof coating with excellent chemical resistance and long-term performance.
 
Once cured, the membrane is capable of resisting very high positive and negative water pressure (up to 10 bar), making it suitable for use on both the water-exposed and reverse sides of structures. The cured coating forms a hard, UV-stable, trafficable surface with excellent adhesion to concrete, masonry and steel.
 
Hydrocoat 103 2K can be applied by airless spray or trowel, allowing rapid coverage on large areas. The thixotropic formulation enables application to vertical surfaces at high film thickness without sagging. For enhanced detailing performance, joints and changes of direction are typically reinforced using Newton Hydrocoat 912-RT.
 
Key Benefits
 
Two-component cementitious waterproofing membrane
Resists positive and negative water pressure up to 10 bar
Excellent adhesion to concrete, masonry and steel
High-build system (~2 mm) bridges minor surface defects
Thixotropic – suitable for vertical and overhead application
Sprayable or trowel applied for fast installation
Durable, UV-stable and trafficable once cured
Non-toxic when cured and very low VOC content
Suitable for damp substrates
Internal and external use
 
Typical Applications
 
Basement walls and earth-retained structures
Podium decks, balconies and roof slabs
Water tanks, reservoirs and water-retaining structures
Car parks, plant rooms and lift pits
Internal tanking and external concrete waterproofing
Structures designed to BS 8102:2022
 
Technical Data – Newton HydroCoat 103 2K
 
Property
Specification
Product Type
Two-component cementitious waterproofing membrane
Components
Part A (liquid) + Part B (cementitious powder)
Pack Size
30 kg total (approx. 6.1 kg liquid + 23.9 kg powder)
Colour
Grey
Application Thickness
Approx. 2.0 mm (one or two coats)
Water Pressure Resistance
Up to 10 bar (positive & negative)
Adhesion to Concrete
> 2 MPa
Tensile Strength
Approx. 2.6 MPa
Elongation
Approx. 3–5 %
Compressive Strength
> 40 MPa (28 days)
Water Vapour Resistance
Sd ≈ 0.9 m
Application Temperature
+5 °C to +35 °C
Pot Life
Approx. 30 minutes at 20 °C
Reaction to Fire
A2-s1 (non-combustible)
Substrates
Concrete ≥ 20 MPa, masonry, steel
Reinforcement
Use Newton HydroCoat 912-RT at joints & details
Finish
Hard, durable, UV-stable, trafficable
Use
Internal & external waterproofing
 
 
Frequently Asked Questions
 
What is Newton HydroCoat 103 2K used for?
 
HydroCoat 103 2K is a two-component cementitious waterproofing membrane used for internal and external waterproofing of concrete, masonry and steel structures.
 
Can HydroCoat 103 2K resist high water pressure?
 
Yes. Once cured, it resists both positive and negative water pressure up to 10 bar, making it suitable for demanding waterproofing applications.
 
How is HydroCoat 103 2K applied?
 
The two components are mixed on site and applied by airless spray or trowel. The thixotropic consistency allows application to vertical surfaces without sagging.
 
Can it be applied to damp substrates?
 
Yes. HydroCoat 103 2K can be applied to damp (but not water-running) substrates.
 
Is reinforcement required?
 
For best performance, joints, cracks and changes of direction are reinforced using Newton HydroCoat 912-RT.