Cemproof Ultra Flex-300

Cemproof Ultra Flex-300 is a two component, flexible cementitious waterproofing membrane formulated for use in positive side waterproofing applications.

Component A is a water based acrylic resin. Component B is a mortar, based on a mixture of cements, tough HDPE fibres, additives and well-graded aggregates.

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  • Features & Benefits
  • Areas of Use

Features & Benefits

• High elongation – Class III.
• Positive side waterproofing.
• Excellent adhesion.
• High abrasion resistance and UV stability.
• Good flexibility.
• Non-toxic and chloride free.
• Resistant to high positive hydrostatic pressure.
• Anti-fracture membrane between substrate and other finishing coats.
• Crack bridging – hairline and shrinkage cracks.
• Carbonation and electrochemical corrosion protection.

Areas of Use

• Bathrooms
• Planter Boxes
• Balconies
• Swimming Pools
• Podium Decks
• Wet Areas Under Tile
• General Concrete Protection


Consistent with the 50 year history of Crommelin, our management team is committed to providing all customers with sound technical advice, innovative products and acceptance of responsibilities associated with our specifications and systems. Warranties of up to 15 years are issued following Quality Assurance procedures. They consist of tailored specifications, maintenance schedules and on site support. Please contact Crommelin for further information.

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