Redefining water stops
For decades, the standard principle in injection technology has been: use foam to stop water ingress.
But this method has clear limitations. That is why it is time to rethink water stops.
PU foams are often the first choice for strong, pressurized water flows. They react quickly to stop the water ingress. As an immediate measure, this works excellently in most cases.
However, the critical question is:
Is foam a permanently watertight solution?
Our experience shows: No.
There are two main reasons for this:
Foam remains foam
Every foam consists of a multitude of cells, pores, and voids. That is precisely its greatest weakness.
Because where there are pores, there are potential pathways for water. Over time, moisture, water pressure, and aging processes can compromise the seal.
A foam therefore always remains a porous material.
For a permanently reliable seal, however, the exact opposite is required: a homogeneous, non-porous resin body.
No adjustment to movement
A seal must not only be watertight today. It must also work if the structure changes in five or ten years.
This is exactly where many foam seals fail. They react quickly and stop the water ingress, but cannot adapt to changes in crack widths or joint movements later on. Even flexible foam fails here.
HydroBloc Rapid 570 takes a different approach.
The elastic resin body uses adaptive sealing technology to actively adapt to changes in the structure—even years after injection.
The result: a seal that not only stops water but remains permanently tight.
That is why at ARCAN we rely on a new technology: water stop without foam.
▶ WATCH THE VIDEO:
HydroBloc Rapid 570 – Water stop redefined
How does the subsequent adaptation work?
The elastic resin bodies can actively adapt to changing cross-sections. This is called adaptive sealing technology.
Foam only adapts once—during the reaction. Afterwards, the structure is fixed. If the crack or joint changes later due to temperature fluctuations, settlement, or structural movements, these changes are no longer compensated for.
Adaptive swelling resins work differently:
They remain permanently elastic and can react to moisture even years after injection. If a crack widens or a joint changes, the material adapts actively. The seal remains intact.
The result: even with structural movements, water has almost no chance of finding new paths.
Foam: cheap to buy, expensive in practice
When choosing an injection material, people often look at the material price first. At first glance, foam resins often appear particularly economical.
But the material price and the expected volume (due to the foam effect) say little about the actual costs of a seal.
The crucial question is:
How much material is actually needed—and how permanent is the result?
Material loss through washout
With strong water flow, a portion of the injected material can be lost.
Low-viscosity foam resins disperse in the water current, do not remain concentrated locally, and are sometimes diluted so heavily that the sealing effect is delayed.
This increases material consumption.
HydroBloc Rapid 570 uses a different approach: The HydroBloc cream technology
Immediately after mixing, the unique Rapid cream is formed. It is not water-miscible and does not disperse in the water current. The material remains exactly where the seal is needed.
The result: higher efficiency and a faster sealing of the leak.
Permanently tight means economical
An elastic and non-porous injection rubber that seals faster and more efficiently is significantly more economical than water-stop foam.
If rework, complaints, and recurring injections can also be avoided, the solution is unbeatable.
That is why the decisive question should not be:
"What does the material cost per kilogram?"
But rather:
"What does the waterproofing cost me over the entire service life of the structure?"
The secret behind the Rapid Cream Technology
Immediately after mixing, the Rapid Cream is formed. It can be pumped for about 60 seconds and flows reliably through cracks and joints.
At the same time, it is not water-miscible and—unlike many low-viscosity foam resins—is not dispersed in the water flow. It remains locally concentrated.
As a result, the material stays exactly where the waterproofing is needed, sealing the water path quickly and reliably.
The reaction is fully complete after just about 120 seconds.
The result is a homogeneous, non-porous, and elastic injection rubber that:
✔ remains permanently watertight
✔ reacts actively to moisture
✔ compensates for structural movements
✔ contains no open foam cells
✔ provides reliable, long-term sealing
Water-stop redefined – no foam, no pores, no compromises.
Why Rapid 570 remains watertight even years later
The adaptive swelling effect actively adjusts the volume to changing joint or crack cross-sections. HydroBloc Rapid 570 can increase its volume by up to 80%.
Important: Rapid 570 is not a gel.
In dry conditions, the additional swelling volume recedes without the material shrinking below its original volume.
Unlike injection gels, HydroBloc Rapid 570 contains no water. The seal remains permanently elastic and functional even in dry conditions.