Mastech Waterstop



Mastech WATERSTOP is an expanding waterstop that consists of natural sodium bentonite and butyl rubber polymers. It is a flexible and self-adhering material which expands colloidally in contact with water and applicable to all construction joints.

Areas of Use

Construction joints, precast elements, water tanks, waste water treatment plants, tunnels, basements, manholes, culverts, reservoirs, swimming pools, canals, etc.

Features and Benefits

  • Easy to install
  • Needs no special handling
  • Flexible
  • Self-adhering
  • Non-toxic
  • Not contain bitumen, tar, asbestos, etc.
  • Excellent adhesion


  • 25 mm x 20 mm x 5 m
  • 25 mm x 10 mm x 10 m
  • 25 mm x 5 mm x 15 m
  • 20 mm x 10 mm x 10 m
  • 18 mm x 6 mm x 15 m

* Different colors and sizes are available.

Typical Physical Properties


Black, Blue and all colors are available


≥ 300%

Specific Gravity

1.50 gr/cm3

Hydrostatic Pressure Resistance

Up to 80 m. water column (8 bars)

Installation Temperatures

-15 °C / 60 °C



Surface Preperation

Surface should be clean and dry

Shelf Life

5 years in original undamaged package **

** Dry and moisture free environment.


Download datasheet as .pdf