Koster KB-PUR® Injection System is a unique method introduced from Chowgule Koster (India) Construction Chemicals Pvt.Ltd.
The system is initiated with the injection of the KB PUR® IN I a two component water activated PU-Injection Foam into the crack, which stops the ingress of water and immediately thereafter is followed by injecting the KBPUR® IN II which is a flexible 2 Component polyurethane – Injection Resin which not only seals off the water but also remains permanently flexible.
The KB-PUR® IN I is water activated hydrophobic MDI based polyurethane foam. The system only reacts when it comes in contact with water, expands and converts into stiff closed cell, waterproof polyurethane foam. KB-PUR® IN I is free of solvents and fillers; it is resistant to hydrolysis and is suitable for use in drinking water areas (KTW-Test). KB-PUR® IN I consists of a resin and a special catalyst, supplied separately, to allow on-site adjustments of gel.
Application ProcedureMark and drill the holes on either side of the Crack / Joints in staggering manner and at a distance of 30 cm c/c on each side and at 45 degree angle, clean the hole and fix the packers and tighten it.
For dry joints KB-PUR® IN IIPU resin can directly be injected. But if the water is oozing out, then KB-PUR® IN I is injected first to stop the water by foaming.
Add the KB-PUR® IN I component A and B and mix thoroughly with a slow speed mixer until a homogeneous mixture is obtained (avoid mixing humid air into the resin). Inject the material with conventional single component pumps at high or low pressure.Always start at the bottom and continue upwards, if in doubt, go back and inject the same packer once again.
As soon as the KB-PUR® IN I comes in contact with water, it reacts and forms foam having 30 times volume expansion. Water will be replaced by the rigid closed cell foam and can no longer pass through the crack.
Mix both the component of KB-PUR® IN II and inject through another pump into the same port injected with KB-PUR® IN I. KB-PUR® IN II will replace the Foam and occupy the entire depth of the crack.
The joints were treated under water pressure with the KB-PUR® IN I - foam forming material and then with KB-PUR® IN II- flexible PU Resin.
Similar treatment was also adopted for the Moving Joints of large basements, settling joints of Thickener at steel plants, Cooling Towers of Power Plant etc.