SikaFix® PU

Use SikaFix® Pump Flush, a non-flammable solvent, to clean tools, lines and equipment of uncured product. Cured material can only be removed mechanically.

For reaction of the material to take place and the expansion mechanism to be activated, all cracks must either contain moisture or be pre-wetted. And for potable water contact applications, use SikaFix® HH+ which is ANSI/NSF Standard 61 approved.

Drill holes at a 45° angle to intersect the crack approx. 100 mm (4 in) below the concrete surface. These holes should be drilled alternately on opposite sides of the crack allowing a 200 mm (8 in) distance between them. This should ensure crack intersection. After fitting injection ports or packers drilled holes should be flushed out using water delivered through a 6 mm (1/4 in) hose from a pressure pot (low pressure) or a high-pressure pump or grease gun (high pressure). Be careful to check that each hole intersects a crack, and a path is available for subsequent injections. Where no travel is evident, additional holes should be drilled to provide the necessary access to the crack. All cracks must either contain moisture or be pre wetted in order to trigger a reaction and activate the expansion mechanism.

SikaFix® PU is supplied in a single or side-by-side cartridges and is easily dispensed with a manual gun through a 6 mm (1/4 in) mixing tube. Use Sika® Injection T’s or use Sika® Injection Ports and fit the fat end into 13 mm (1/2 in) holes.

The reaction time lasts 39 seconds and the gel time lasts 460 seconds. 

Attach the static mixer to the cartridge and dispense SikaFix® PU using either a pneumatic or manual dispenser. Injection of SikaFix® PU is carried out, starting at the lowest injection point. As SikaFix® PU moves into the crack, water is displaced ahead of it. Once all the water is released, SikaFix® PU will follow the water - when this is observed, injection should move on to the next packer and the same process continues along the crack until it is completed. Excess SikaFix® PU appearing on the crack surface can be easily removed when product has stopped foaming, using a sharp knife.

SikaFix® PU has a high bond strength even to damp surfaces. It can be used for cracks in tanks, tunnels, pipes, basements, pools, subways or any structure where water intrusion must be stopped. 

1 L (33.8 US fl. oz) grout yields approximately 25 L (6.6 US gal) foam (typical free expansion). And 1 L (33.8 US fl. oz) grout yields approximately  3 L (0.79 US gal) foam (typical contained expansion). Variation in crack/void configuration, injection conditions and end use will influence the yield.