Catalyst PWC

Catalyst PWC

Catalyst PWC is a biochemical modified silicate solution that provides long-term waterproofing and durability benefits to concrete.  It penetrates into concrete and reacts with free calcium and water to form a water insoluble calcium silicate hydrate gel complex in cracks, pores and capillaries.  This gel creates a sub-surface barrier against the ingress of water and contaminants such as chloride ions.  Catalyst PWC will seal existing leaking cracks to 2.0mm.  In the matrix the product remains active when in contact with water to provide autogenous healing properties to future hairline cracks.

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  • Features & Benefits
  • Areas of Use

Features & Benefits

  • Long term performance
  • No re-application or future maintenance required
  • 100% trafficable after the first watering
  • Minimal risk of damage during construction or thereafter
  • Fault finding. If stubborn cracks are present they are easy to find and fix
  • No lifting of membranes required
  • Permanently seals existing cracks to 2.00mm
  • Reseals future hairline cracking 
  • Increases surface hardness 
  • Allows moisture vapour permeability 
  • Suitability for tanking applications (positive hydrostatic pressure).

Areas of Use

  • Building rooftops 
  • Car parks 
  • Bridge decks 
  • Wharf decks Podium decks 
  • Airport runways, taxiways and aprons 
  • Potable water tanks 
  • Viaducts 
  • Water treatment works 
  • Cut and cover tunnels 
  • Rendered surfaces, e.g.: over block work and brickwork 
  • Façades 
  • Precast elements & panels


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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