Mono-component, osmotic, rigid waterproofing cement

Code: OSM.0086

Components: 1

Appearance: Powder

Cement compound for the preparation, with the sole addition of water, of a waterproofing osmotic coating that can create horizontal and vertical barriers, also suitable in conditions of negative hydrostatic thrust vis-à-vis water permeation in the buildings. Typical uses include waterproofing underground rooms, elevator compartments, garages, basements, tanks, etc.

Functional categories
Customs Code
3824 5090

Linee di appartenenza

Certification obtained and Standards

Specification for Mortar for Masonry - General purpose rendering/plastering mortar (GP)

EN 998-1

Specification for Mortar for Masonry - General purpose rendering/plastering mortar (GP)

Suitability to contact with drinking water (Quality of water intended for human consumption)

Direttiva 89/93/CE

Suitability to contact with drinking water (Quality of water intended for human consumption)

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

General characteristics


Shelf-life: 12 months


To be applied in two coats


Max. recommended thickness: 5 mm


Suitable for contact with drinking water


Pot-life: 60 min


Temperature of use: +5 / +35 °C


Mix with water: 19-22 %


Maximum diameter of aggregate: 0.7 mm


Min. recommended thickness: 1.5 mm

Technical specifications


1930 kg/m³

Compressive strength

> 20 N/mm²

Capillary absorption

0.08 kg•h^0.5/m²

Bonding force

2.6 N/mm²

Setting time

3 h

Available colours

- White

- Gray

Packaging and dimensions

- Bag 25 kg


The action of the active components and of the adhesion promoters of OSMOCEM N, saturated by the reaction the support capillaries, forming a complex system of gel and stable crystals, which results in the best sealing, effective even in conditions of negative hydrostatic thrust, without hindering the breathability of the walls.

OSMOCEM N is compatible for food substances: is certified as suitable for the containment of foodstuffs and drinking water (Certificate no. 02/2010 Laboratorio Analysis Service di Settimo di Pescantina - VR).


Approximately 1.7 kg/m² of OSMOCEM N for each millimetre of thickness to be made.

Use fields

Waterproofing rigid structures and masonry walls underground, buried or in any case subject to water permeation: lift wells, basements, tanks, pipes, tunnels, garages, bridges, reservoirs, areas containing food, etc. in conditions of positive and negative hydrostatic thrust provided they are sufficiently porous and absorbent and free from any waterproofing and / or water-repellent surface treatment, whether chemical (siloxanes, epoxies, polyurethanes, etc.) or natural (wax-up).

Preparation of supports

Application surfaces should be clean, free of soiling, crumbling and non-adhering parts, dust, etc., water repellent treatments in general, etc. conveniently saturated with water until they reach the condition "saturated with dry surface".

Use method

Pour about 2/3 of the mixing water into the mixer, add OSMOCEM N and the remaining water; continue to mix until a homogeneous lump-free mixture is obtained. The mixing water should be about 19-20% (for interventions in the form of a spatula) or 21-22% (for interventions using a brush with long bristles). After mixing is completed wait a few minutes before applying. If applied by brush, roll out two or more crossed coats.

Although it is not a specific product for finishing thick coats, it can still be used for these purposes. In these cases, it is appropriate to use a fibreglass mesh ARMAGLASS 160.

Application methods

- Finishing trowel

- Plastering machine

- Brush

- Spatula

- Sprayer

Tool cleaning

- Water

Permitted supports

- Concrete

- Prefabricated concrete

- Fiber-cement

- Bricks

- Mixed walls (bricks and stones)

- Stone walls

- Rock walls

Warnings, precautions and Ecology

It is always essential to carry out preliminary tests to verify the appropriateness of the product, depending on specific requirements.

Do not apply in case of direct exposure to sunlight and cure the protection and moist hardening.
Do not apply on little or non-porous substrates or previously coated with water-repellent treatments in general, if not after appropriate roughening by bush hammers, sanders and equipment suitable for preparatory treatments of substrates, or after appropriate treatment with suitable polymeric primers.


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