NBS Source
Newton 103-S


Suitable for the internal and external waterproofing of concrete and steel elements of water-retaining and water-resisting structures such as reservoirs, water tanks, below ground structures, podium decks and parking areas.


A two component, thixotropic, cementitious modified polymer waterproofing membrane with high adhesion.

Capable of resisting extremely high positive and negative water pressure, it forms a hard, highly alkaline coating with a degree of elasticity which has greatly enhanced chemical resistance and so is particularly suited for the protection of concrete within sulfate contaminated ground. It has excellent resistance to the ingress of acid gases, moisture and chlorides to enhance the durability of reinforced concrete and protect highway and coastal structures from chloride attack.

It is recommended that Newton 103-S and its ancillary products be installed by contractors trained by Newton Waterproofing Systems in the correct use and specification of the product.

Surface preparation is required, as is protection after application - consult manufacturer for details.

Features and benefits:

  • Resistant to 10 bar positive and negative water pressure.
  • Quick application in one coat to horizontal surfaces.
  • Non-toxic when cured and is authorised for use under Regulation 31 of the Water Supply (Water Quality) Regulations 2000 for use in contact with drinking water.
  • Sprayable - Up to 2 m² per minute is possible.
  • Hard, durable and UV-stable trafficable finish.
  • All year round application is possible, even onto damp substrates.
  • Can be applied at temperatures as low as 5°C.
  • Very low volatile organic compound (VOC) content.
  • Very high diffusion resistance to carbon dioxide gas and chloride ions; provides the equivalent to 100 mm of good quality concrete cover.
  • High level of adhesion to sound prepared concrete substrates and steel.
  • Thixotropic - can be applied at 1 mm to vertical surfaces.
  • High build coating of 2 mm eliminates the incidence of small defects seen within thinner membranes.
  • Correctly prepared suitable substrates include concrete of at least 20 kN, steel, and correctly prepared mortar.
  • Can be applied via a variety of different methods, including squeegee, pin leveller, roller, brush, airless spray, or trowel.
  • Guaranteed to resist weathering for up to ten years.
  • CE marked, and manufactured in accordance with EN 1504-2: 2004.


  • Ready for next coat: At 5°C: After 80 minutes; at 10°C: After 60 minutes; at 15°C: After 50 minutes; at 20°C: After 40 minutes; at 25°C: After 33 minutes.
  • To be kept rain-free: At 5°C: For 3 hours; at 10°C: For 2.5 hours; at 15°C: For 2 hours; at 20°C: For 1.5 hours; at 25°C: For 1.5 hours.
  • Ready for temporary traffic/ protection boards: At 5°C: After 24 hours; at 10°C: After 24 hours; at 15°C: After 22 hours; at 20°C: After 20 hours; at 25°C: after 18 hours.
  • Ready for floor/ hosepipe test: At 5°C: After 8 days; at 10°C: After 7 days; at 15°C: After 6 days; at 20°C: After 5 days; at 25°C: After 4 days.
  • Fully cured: After 28 days.

General information



Matte grey


Cementitious polymer


2 mm thick waterproofing membrane


30 kg in two parts - 6.1 kg Part A (Liquid) and 23.9 Part B (Powder)


When specified, installed and protected in accordance with the Data Sheet and Application Guides, is fully and permanently isolated from UV light and physical damage or wearing, and only to those substrates confirmed within, Newton 103-S has a service life that can be equal to the design life of the structure

Uniclass 2015

Pr_25_57_51_66 Polymeric membranesPrimary


J10/110 Proprietary mortar

J31/130 Inverted roof coating

Product range

Liquid Waterproofing Membranes

Specification data - Polymeric membranes Enhanced data


Cementitious polymer.


To BS EN 1542, BS 6319-7:1994, BS 4551, BS EN ISO 868: 2003, BS EN ISO 7783: 2011, BS EN 13687-1, BS 4551 and BS EN 1770.

Third-party certification

DWI regulation 31 approved. CE marked, and manufactured in accordance with EN 1504-2: 2004.

Width (minimum)

2 mm.




Special order.

Coloured UV stable protective coatings available, consult manufacturer for details.

Product Reference

Newton 103-S

Density / Specific gravity


Shelf life

12 months.

Yield per kg

0.55 L.

Pot life at 20°C and relative humidity of 40%

30 minutes.

Application rate - in one or two coats

3.6 kg/m².

Application temperature

+5°C to +35°C.

Service temperature

-15°C to +180°C.


Low - characterised as polymeric.

Adhesion to concrete

>2 MPa BS EN 1542.


2.5 MPa BS6319-7:1994.


3 to 5%.

Compressive strength - 1 day

>10 MPa BS 4551.

Compressive strength - 7 days

>40 MPa BS 4551.

>30 MPa BS 4551.

Hardness (28 days)

>75 Shore D. BS EN ISO 868:2003.

Compressive strength - 28 days

>40 MPa BS 4551.

Water vapour resistance - Sd value

0.91m BS EN ISO 7783-2.

Water vapour resistance - Mu value

455 µ Calculation from SD value.

Water vapour resistance

4.55 MNs/g Calculation from SD value.

Water resistance - Positive and Negative

10 Bar DIN 1048.

Reaction to fire classification

A2-s1 Euroclass.

Thermal compatibility

>2 MPa EN 13687-1.

UV Resistance - Stable but will discolour

50 years UNI EN ISO 11507:2007.




NEWTON 103-S High Performance Liquid Waterproofing Membrane

NEWTON 103-S High Performance Liquid Waterproofing Membrane

Similar products from Newton Waterproofing Systems

Newton 106 FlexProof

Newton 106 FlexProof

Newton 108 HydroBond-LM

Newton 108 HydroBond-LM

Newton 109-LM

Newton 109-LM

Newton 409 Root Barrier

Newton 409 Root Barrier