concrete and masonry accessories
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Mastic & Hydrophilic Waterstops

Synko-Flex® 302Fuel Resistant
Synko-Flex® 312
Hydro-Flex® 302Primer 311



Installation and
Technical Data

Synko-Flex® 312 fuel resistant waterstops

Synko-Flex       Preformed Plastic Adhesive Waterstop

Synko-Flex® Fuel Resistant Waterstops

Mastic Waterstops Installation Synko-Flex® 312 waterstop is designed to both control the ingress and egress of hydrocarbons and contain liquids at the control joints between concrete to concrete and concrete and dissimilar products. This product is an N.B.R. compound with polypropylene resins and other solvent resistant elastomers and plasticizers.


Synko-Flex® 312 is designed to provide a watertight seal of cold joints in a wide range of concrete structures where there is good potential for exposure to hydrocarbon liquids, including; residential and commercial basements, secondary containment structures, highway tunnels, concrete lined storm drainage and irrigation channels, pedestrian tunnels and below-grade walkways, below-grade parking garages, and wastewater treatment plants.

Synko-Flex® 312 may also be used to seal around concrete, steel, PVC or HDPE pipe penetrations through concrete walls or floor slabs.

Synko-Flex® 312 is also ideal for use as a joint sealant on precast structures such as box culverts, septic tanks and utility vaults.

Packaging for synko-flex 312 waterstops

Synko-Flex® Primer

The primer readily penetrates the pores and seals dusty concrete surfaces to providing an optimal surface for the adhesion and bonding of Synko-Flex performed mastic waterstops.