Hydro-expansive polyurethane resin, without solvents, injectable

Code: SYN.0187

Components: 2

Appearance: Liquid

Mono-component, enabled for contact with drinking water, semi-flexible, expanding (increases its initial volume of about 20 times) polyurethane resin, free from solvents, perfect for sealing small and large water leaks in the concrete or in solid masonry in general by injection. Perfect for filling large voids and loose stone foundations inside the walls.

Linee di appartenenza

Certification obtained and Standards

Regulation concerning materials and objects that can be used in fixed systems for the collection, treatment, adduction and distribution of water intended for human consumption (in implementation of Directive 98/83/CE).

D.M. 06/04/2004, n. 174

Regulation concerning materials and objects that can be used in fixed systems for the collection, treatment, adduction and distribution of water intended for human consumption (in implementation of Directive 98/83/CE).

General characteristics


Highlighted product


Use wearing protective gloves


Temperature of use: +8 / +35 °C


Shelf-life: 12 months


Use wearing protective glasses


Hydroexpansive product: +2000 %




Pot-life: <5 min


Density: 1.15 kg/dm³

Technical specifications


90 mPa

Available colours

- Brown

Packaging and dimensions

- Can 25 kg [A]

- Kit: 1 Can 25 kg [A] + 1 Plastic can 2.3 kg [B]

- Plastic can 2.3 kg [B]


In contact with water, SYNTECH H.A.G. ECO, forms a semi-flexible polyurethane foam. Technically, it is a mono-component product which reacts spontaneously with the water present in the masonry to be sealed. The speed of reaction with just water, however, would be very slow relative to the construction site requirements. It is therefore essential to use an expansion accelerator, sold in combination with the same resin (component B).

The polyurethane foam resulting from injection operations, will keep its volume stable once expanded. A good resistance to hydraulic pressure in the water flow after about 1-2 minutes from the time the reaction took place. The formation of CO₂, typical of the polyurethane reaction, will further pressurise the system, thus favouring the penetration of the resin in the cracks and cavities. In a free environment, SYNTECH H.A.G. ECO expands to about 20 times its initial volume.


The consumption of the product depends on the size of the vacuum volume to be filled and on the expansive reaction that occurs after mixing the two components in relation to the amount of water present.

Use fields

Stop the infiltration of water in underground spaces. Perfect for waterproofing filling large cavities or loose stone foundations in the concrete and in solid masonry in general.

Preparation of supports

The application surfaces should be clean, free of incrustations, crumbling and non-adhering parts, dust, moss, moulds, etc. Prepare the appropriate injectors, usually "staggered" (from one side to the other of the discontinuity to be sealed). Preliminarily inject abundant water in the discontinuity until saturation (if not already present).

Use method

Pour 100 g of component B for each kilogram of component A (ideal and recommended dosage), in a bucket. Mix the two components thoroughly with a hand tool (do not use a mixer drill). Keep in mind that the resin could react even with the environmental humidity, therefore, to reduce the waste of material it is advisable to prepare a quantity of mixture strictly necessary for the intended use from time to time (2-3 kg of mixture at a time may be more that sufficient).

The mixture of SYNTECH H.A.G. ECO and its catalyst can be injected with a manual or electric pump for monocomponent resins, at pressures ranging between 40 and 200 bar.

The reaction speed can easily be adjusted based on the accelerator (component B) quantity. Adding a greater quantity of catalyst, compared to the recommended 10%, reduces the reaction time.

Always clean the pump used thoroughly at the end of the operations with Nitro thinner and the specific lubricant detergent SYNTECH H.A.G. CLEANER.

Application methods

- Injection

- Pump

Tool cleaning

- Nitro thinner

Permitted supports

- Bricks

- Concrete

- Mixed walls (bricks and stones)

- Rock walls

- Stone walls

- Tuff

Warnings, precautions and Ecology

SYNTECH H.A.G. ECO is physiologically harmless once the reaction has taken place. The product is packaged under dry nitrogen and is very sensitive to humidity, also environmental. It is recommended that you use a very small quantity at a time and carefully close the whitewash before putting them to rest.

Ensure the secure sealing of the injectors placed in the supports. Given the high injection pressures reached by the pumps, in the case of injectors not positioned securely and correctly there is a real risk that they might come out at high speed from their seat (with the risk of injury to the operators!).

Carefully study the positioning of the injectors near the masonry discontinuities to be injected. Bad positioning, too close to the crack to be filled, can cause the breaking of the support itself under the pressure of the pump.

Take all due care during the use of the electric pumps, which can easily reach a pressure of 200 bar, and thus cause undesired breaking of concrete and masonry supports being injected.

Remove resin residues overflowing from masonry within a few hours of stopping infiltrations. Delayed removal may be more difficult.

Contact us now

Want to know more about our products?

Attention, correctly compile this field.
Attention, enter a valid email address.
Attention, correctly compile this field.

By submitting I accept the privacy policy

Attention, correctly compile this field.

Subscribe to the newsletter


Products on display

  • Protech Balcony
  • Opus Dry
  • Concrete Repar