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Estoflex PU950

Flexible Bitumen – Rubber Membrane

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Estoflex PU950

Single Component, Water based Polyester- Polyurethane Waterproofing Membrane


Estoflex PU950 is flexible single component water based Polyester-Polyurethane waterproofing and sealing membrane with for external or internal application on wall and roof.


To provide 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:

  • Reinforced Concrete Roofs
  • Metal Roof
  • Waterproofing of terraces and balconies
  • Hollow core concrete roof
  • Cement screed flat roof


  • Suitable for external areas on wall and roof with Ultra Violet Resistant.
  • Environmentally friendly product
  • When fully cured, it forms a flexible membrane
  • Able to withstand human traffic
  • Ease of application
  • Crack bridging capabilities up to 1mm


Physical Properties

Appearance Liquid
Standard Colour Grey
Solid Content, % > 60
Elongation at Break, % ASTM D412 > 400
Tensile Strength, N/mm2 ASTM D412 > 1.0
Adhesion to concrete at 25oC, N/mm2 ASTM D4541 > 1.0
Water Absorption, % BS1881:Part 122 < 0.5
Drying Time at 25oC, hrs Touch Dry

Re-coat Cure Time


2 – 4

4 – 8


Recommended thickness (WFT), mm 1.0 ± 0.2 / coat


Application Instruction

Surface Preparation

All surfaces should be generally sound and clean. Cracks and joints should be cleaned and filled with Estoflex PU950 separately, allowing drying. Larger cracks should be chased  out to at least 10 mm wide and repaired with Estop joint sealing compounds such as Estojoint or Estolastic.

Base Screed (for R. C. flat roof)

Base screed with minimum gradient of 1:120, to receive Estoflex PU950, shall be laid if the floor is uneven and without required gradient, to achieve better waterproofing performance.

Metal Surface

For steel substrates, it is ideally to blast cleaning to SA2½ standard. Clean the metal surfaces and scrape off the flaking paint and any loose materials before application of Estoflex PU950.


The cleaned surface shall be primed by brushing the surface with 1 part Estoflex PU950 mix with 1 part of clean water and then apply directly to the surface to be waterproofed, in order to improve the bonding. Allow primer coat to dry. The priming  coat shall be extended at least 240mm up to all parapet walls.


Pre-mix the material with slow speed mechanical stirrer for at least 1 minute.

Apply the first neat coat of Estoflex PU950 on the prepared substrate surface with squeegee, roller or by spray method. Leave it to dry for 4-8 hours in between each coat. Recommended thickness is approximately 1.0 mm in minimum 2 coats.


Incorporate a layer of Estop Fiberglass where necessary. Estoflex PU950 is very effective when sandwiched with Estop fibreglass to repair leaky gutters, down spouts, etc. to bridge cracks; corrosion etc. providing the damage is not  too extensive. Do not pour surplus materials down drain, wash all brushes immediately or keep immersed in water.


The applicator should also take precautions to protect the Estoflex PU950 membrane from any mechanical damage during the construction of other works to be carried out directly on the Estoflex PU950 membrane.

Packing & Size

Estoflex PU950 20 litre pail




Estoflex PU950 1.0L / m2 / neat coat

                                              Depend on porosity of substrate 



Estoflex PU950 material should be stored below 30ºC out of direct sunlight and rain. All containers should remain sealed until ready to use.

Up to one year in unopened container and stored in a cool and dry elevated place.

Shelf Life

Up to one year in unopened container and stored in a cool and dry elevated place.

Health and Safety

Proper PPE especially safety mask are to be worn during application. In case of eye splashes or excessive skin contact, wash thoroughly with clean water. If ill effects occur, seek medical attention immediately.

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.

Additional Information

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