ESTonetex Fibrax

Applications

• High-adhesion mineral primer and bonding layer on expanded (EPS) and extruded (XPS) polystyrene

• ESTonetex System theming: waterfalls, artificial rocks, decorative sculptures and theme parks

• Renovation work and restoration projects

• Primer on mineral substrates when a high-adhesion mineral layer with a suitable texture is needed to receive ESTonetex mortars

• Replaces fibreglass mesh on polystyrene thanks to its high fibre content

Technical specifications

Packaging	25 kg paper bag. Pallet of 48 bags (1,200 kg)
Reference	1007
Colour	Grey
Particle size	Continuous, 0 to 2 mm
Application thickness	Recommended minimum of 5 to 8 mm. As a primer: minimum 5 mm if it is smoothed with a trowel or notched trowel, or 5 to 10 mm if left with the application texture (when the finishing mortar applied afterwards is under 2 cm)
Mixing water	5.5 L per 25 kg bag, to a soft-fluid consistency depending on the application method
Consumption	12-13 kg/m² per cm of thickness
Fresh mortar density	1.45 ± 0.1 kg/l (EN 1015-6)
Air content of fresh mortar	30 % (EN 1015-7)
Compressive strength	15 N/mm² at 28 days (EN 1015-11)
Flexural tensile strength	4 N/mm² at 28 days (EN 1015-11)
Adhesion to polystyrene (EPS)	0.2 N/mm² (failure in the substrate)
Adhesion (FP)	0.3 N/mm² (A/B): removal from the substrate or mortar failure (EN 1015-12)
Reaction to fire	Euroclass E
Classification	GP CSIV W2 (EN 998-1), CE marked
Shelf life	Up to 24 months from the date of manufacture, in the original packaging, under cover and in a dry place

Data from the official technical data sheet. Full technical documentation and certificates are available on request through the contact form.

Supports

Expanded polystyrene (EPS), extruded polystyrene (XPS) and similar materials, and even mineral substrates when a high-adhesion mineral primer with a suitable texture is needed to receive ESTonetex mortars. The substrate must be clean and free of dust, impurities and removable parts that could prevent proper adhesion. On polystyrene, sanding the surface is recommended to improve its roughness and make anchoring easier.

How is ESTonetex Fibrax mixed?

Mix with clean water, starting with 5.5 litres per 25 kg bag, until a soft-fluid consistency suited to the application method is obtained, especially when spraying with a machine. Let the mix rest for about 5 minutes before applying.

How is it applied?

It can be applied by hand with a trowel, although spraying with portable machines, such as four-hole stucco plasterers or mortar sprayers, is more advisable. A minimum thickness of 5 to 8 mm is recommended, ensuring in any case the adhesion of the finishing layer. As a primer, apply a minimum of 5 mm if it will be smoothed with a trowel or notched trowel before a finishing mortar of less than 2 cm, or 5 to 10 mm if left with the application texture. If the thickness applied afterwards is equal to or greater than 2 cm, it can be left as is after spraying.

Observations and precautions

Do not apply with risk of frost, rain or strong wind, or below 5 °C or above 30 °C. Not suitable for surfaces in continuous contact with water. Contains cement: wear gloves, goggles and a mask, and avoid creating dust. Professional product: always consult the safety data sheet.

Complementary materials

• ESTonetex Forte: thin-layer decorative mortar (2 to 15 mm) for EPS/XPS, with its own adhesion method; it does not have to be combined with Fibrax

• ESTonetex mortars: ESTonetex System finishing mortars applied over the Fibrax primer

Frequently asked questions

What is ESTonetex Fibrax mortar used for?
As a high-adhesion mineral primer and bonding layer on expanded (EPS) and extruded (XPS) polystyrene, and also on mineral substrates, to receive ESTonetex finishing mortars in theming, renovation and restoration work.

What is the difference between ESTonetex Fibrax and Forte?
Both are applied on EPS/XPS, but neither requires the other. Fibrax is a super-fibre primer that avoids the need for fibreglass mesh. ESTonetex Forte is a thin-layer decorative mortar (2 to 15 mm) with its own adhesion method (with mesh when used as a primer), and it also works as a primer for TXT, Park, Sulfo and Extreme.

Is fibreglass mesh needed with ESTonetex Fibrax?
No. Its high fibre content avoids the need to apply fibreglass mesh on the polystyrene.

What thickness of ESTonetex Fibrax should be applied?
A minimum of 5 to 8 mm is recommended. As a primer: minimum 5 mm if it is smoothed with a trowel or notched trowel, or 5 to 10 mm if left with the application texture, when the finishing mortar applied afterwards is under 2 cm.

How much ESTonetex Fibrax mortar is needed per m²?
Consumption is 12 to 13 kg/m² per cm of thickness. As a guide, a 25 kg bag covers about 3.8 to 4.2 m² at 5 mm thickness and about 1.9 to 2.1 m² at 1 cm.

How much water does it need and how is it applied?
Start with 5.5 litres of water per 25 kg bag, to a soft-fluid consistency. It can be applied by hand with a trowel, although spraying with portable mortar-spraying machines is more advisable.

Can ESTonetex Fibrax be used on concrete or other mineral substrates?
Yes, the technical data sheet covers its use on mineral substrates when a high-adhesion mineral primer with a suitable texture is needed to receive ESTonetex mortars.

What application conditions must be respected?
Apply between 5 °C and 30 °C and without risk of frost, rain or strong wind. It is not suitable for surfaces in continuous contact with water.

How long can ESTonetex Fibrax be stored?
Up to 24 months from the date of manufacture, in the original closed 25 kg paper bag, under cover and in a dry place.

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