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Estoflex SM

High Performance Polymerised Instant Set Spray Waterproofing Membrane

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Estoflex SM is a polymer modified emulsion. The material is spray applied in conjunction with a water soluble catalyst through specially designed spray equipment.

It can be applied over damp surfaces and onto green concrete.

Estoflex SM has been tested by SIRIM BHD & Testech Sdn Bhd, in accordance to BS 1881 Part 122:1983, on Water Absorption Test; ASTM E96-00, on Water Vapour Transmission and complied with the specification in this data sheet.


Estoflex SM is a spray applied, seamless, polymer modified emulsion designed for a range of waterproofing applications including R. C. roof basement, underground structures and intricate details.


  • Sets instantly on application
  • Forms a continuous (seamless) waterproof membrane
  • High bond strength
  • High elongation and flexibility
  • Rapid application rate
  • Applicable to damp surfaces
  • Priming coat is no required

Standards Compliance

  • ASTM C156
  • ASTM C309
  • ASTM D412:90
  • ASTM D624:73
  • ASTM D2240
  • ASTM E96-00
  • BS 1881 Part 122:1983

Physical Properties

Form Liquid
Solid Content, % 60
Density, kg/L 1.02
Ultimate Elongation, %
ASTM D412-90
Ultimate Tensile Strength,
Recovery from 350%
Elongation, %
ASTM D412-90
Modulus kN/mm2ASTM D412-90 0.06
Tear Resistance, kN/m
ASTM D624-73
Puncture Resistance, N
(at maximum displacement)
ASTM 154
Crack bridging capability, mm 1 – 2
Water Pressure
Negative – passes @10 m
Positive – passes @ 70 m
Water Absorption, %
BS 1881 Part 122
< 1.0
Shore A Hardness
ASTM D2240
40 max
Water Vapour Transmission,
g/m2/day ASTM E96-00
< 21
Water Vapour Diffusion (SD), m
ASTM E96-00
< 0.20
Methance Diffusion, cm2S-1 2.75 x 10-6
Chloride Ion Diffusion
(Taywood Method)
NIL @ 120 days
Curing Efficiency
Chemical Resistance Resistant to mild alkalis
Resistant to mild acids
Not resistant to solvents
Nor resistant to oils

Application Instructions


All surfaces shall be cleaned and free from dust, dirt oil, grease moss and other materials which may affect adhesion.

All ribs and protrusions must be removed and make good using Estop repair mortar.

Estoflex SM may be used on damp surfaces or applied onto green concrete. Estoflex SM will not bond when applied directly to permanently wet ponding substrates.


No priming coat is required for Estoflex SM waterproofing system.


Estoflex SM is applied to the substrate using specifically designed spray application equipment. It is applied in a single coat by wet passes to give a minimum dry film thickness of 1.5 to 2.0 mm.

The material is applied from the lowest to the highest point on slow even strokes.

Overspray can be prevented by the use of baffle board or by masking off.


Estoflex SM membrane must be protected from traffic and backfill and weathering soon after application using Estop Fibreglass or needle punch, geotextile materials. Protective screed is needed for R.C. flat roof waterproofing.

Packing & Size

Estoflex SM 209 litre drum
20 litre pail
Estoflex SM Catalyst 20 litre pail


Estoflex SM 0.33 to 0.44 2/litre


Estoflex SM with Estop
2.0 – 2.5 mm
Estoflex SM with needle
punch geotextile
2.5 – 3.0 mm

Technical Support

Estop offers a comprehensive range of high performance, high quality of product for both new and existing concrete surfaces. In addition, the company offers a technical support package to specifiers, end-users and contractors, as well as on-site technical assistance.


Estoflex SM should be stored on pallets in dry conditions. Under these conditions, the product will have a shelf life of 6 months.


Estoflex SM should not be swallowed or in contact with skin and eyes. Wear suitable protective gloves and goggles.

In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. If swallowed seek medical attention immediately – do not induce vomiting.

Additional Information

Estop manufactures and offers a wide range of complementary products, which includes waterstops, waterproofing products, grouts, anchors, specialized flooring products. In addition, a wide range of products formulated for repair and refurbishment of spalled concrete are available.