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Estoflex PU850

High Performance Moisture Cured Polyurethne Elastomeric Liquid Applied Seamless Waterproofing Membrane

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Estoflex PU850 is a single component which is newly developed polymer of MMA, natural rubber, and polyurethane form elastic waterproof membrane.

Estoflex PU850 has been tested in accordance to ASTM D412, on Elongation & Tensile Strength Test, and complied with the specification in this data sheet.


To provide a better water and vapour proof in complicating application surface compare to membrane type and ensure better integrity between applied surfaces and waterproofing coating. Areas of application:

  • Ground and suspended floor slabs
  • Terraces and balconies
  • Patios
  • Bathrooms and kitchens
  • RC gutters and planter boxes
  • Swimming pools and fountains
  • Water tanks
  • Basements and floor and walls
  • Retaining walls


  • Ease of application directly from container.
  • High elasticity.
  • Super adhesive strength.
  • Can apply directly on damp or wet surfaces.
  • Seamless membrane
  • Application follow contour of irregular surface
  • Non-toxic.

Standards Compliance

  • ASTM D412-2002
  • BS 1881 Part 122:1983

Physical Properties

Colour Dark Brown
Elongation at Break, %
ASTM D 412-2002
> 480
Tensile Strength, MPa
ASTM D412-2002
> 1.40
Water Absorption Test, %
BS 1881 Part 122:1983
< 0.50

Application Instructions

Surface Preparation

All the surfaces must be clean, free from grease, oil, laitance, and remove all the dirt and contaminants, which might affect adhesion. The impurity outside the structure body should be cleaned thoroughly.

Any crack or water leakage area should be pre-treated and reinforced with Estop repair system (for more detail, please refer to our Technical Department) before the waterproofing.

For some diffcult areas, such as the position of cracks, secondary joint right angle of wall and the boundary of water jacket shall be strengthened first with one layer of Estoflex PU850.

Right angle bends must have a cement/sand fillet installed prior to application of Estoflex PU850.


For porous concrete substrate, a mixture of 1 part Estoflex PU850 with 3 parts of clean water is used as primer before application of neat coat.


Apply the first neat coat of Estoflex PU850 on the substrate surface with brush, roller or by spray method. Leave to cure for approximately 8 hours before applying second neat coat.

A total of two neat coats shall be applied.


For optimum performance, Estoflex PU850 should be allowed to cure for 12 hours before installing other finishing works, such as tiling, screeding etc and during this period precaution must be taken in order to prevent damaging to the coating.


The freshly applied waterproof membrane shall be protected from rain, dirt, oil grease or other loose materials during its drying time.

The contractor should also take precautions to protect the Estoflex PU850 membrane from any mechanical damage during the construction of other works. The protection shall be by laying of protective screed on floor and skirting or 25mm thick polystyrene board on vertical wall before back filling.

Packing & Size

Estoflex PU850 20L Pail


Estoflex PU850 1.3 L / m3 / 2 coats
depends on porosity of surface

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 PU850 should be stored in original unopened packaging in dry conditions under ambient room temperature.

Under these conditions, the product will have a shelf life of 12 months. Shelf life may reduce if stored in extreme heat locations.


Wear impervious gloves and barrier cream if user is sensitive to resin system. Wear eye protection.

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.