r micro

Family: Precision-cut micro fibres

Application: Microfibres for plastics and coatings

Microfibres of various materials mainly improve the non-structural characteristics of the matrices. They reduce plastic shrinkage cracking in mortars and concretes while contributing to the mechanical behaviour in synthetic matrices. In pre-dosed mortars it allows the adjustment of rheological parameters. They improve the final finish and are imperceptible, so they are used in top coats. Additionally, they provide medium protection during the occurrence of a fire and modify insulating properties.

	Diameter	Length	Dispersible	Downloads
r micro AR 4	13 μm	4 mm	Yes
r micro AR 6	11 μm	6 mm	Yes
r micro PP 12	40 μm	12 mm	No	DdP
r micro PP 18	40 μm	18 mm	No	DdP
r micro PP 6	40 μm	6 mm	No	DdP
r micro Blast 6	18,31 μm	6 mm	No	DdP
r micro Blast 12	18,31 μm	12 mm	No	DdP
r micro Blast 18	18,31 μm	18 mm	No

Advantages

Improves rheology and provides adhesion, impact, abrasion and flexural strength.
Suitable for pumping and polishing.
High chemical resistance.
Flame-retardant properties.

Frequently asked questions

What is r-micro fiber?

r-micro is a blend of high-fineness monofilament microfibers, composed of Polypropylene (PP) and Alkali-Resistant (AR) Glass. It is specifically designed for the effective control of plastic shrinkage cracking in concrete and mortars.

What is its main function? Is it a structural fiber?

Its function is NON-structural. It acts as a three-dimensional secondary reinforcement that "stitches" the cement paste during the early hours of setting. Its purpose is to prevent the formation of microcracks while the concrete is in its plastic state, but it does not replace the primary structural reinforcement (steel mesh or macrofibers) needed to bear loads.

Why are the two materials, Polypropylene (PP) and AR Glass, combined?

This synergistic combination leverages the best properties of each material for complete protection:

Polypropylene (PP): Provides an extremely dense network with millions of filaments per kilogram. It is very effective at controlling cracking in the earliest stage (plastic shrinkage).
AR Glass: Thanks to its higher stiffness (modulus of elasticity) and excellent bond with the matrix, it helps control drying shrinkage cracking in later stages and improves the impact resistance of the hardened surface.

How does it differ from a macrofiber like r-hook or r-grip?

The difference is total in terms of function and scale:

Function: Microfibers prevent cracks in the fresh state; macrofibers provide load-bearing capacity and ductility to the hardened concrete.
Scale: Microfibers are much shorter and thinner, creating a very dense network. Macrofibers are longer and more robust to "bridge" larger crack openings and transfer loads.

What are the ideal applications for r-micro?

It is perfect for any application where surface finish quality and crack minimization are important:

Concrete slabs and pavements, as a complement to structural reinforcement.
Plastering, rendering, and screed mortars.
Precast elements with high aesthetic requirements.
Shotcrete to improve cohesion and reduce rebound.
Repair mortars.

What specific benefits does it bring to the concrete?

Drastically reduces cracking from plastic and drying shrinkage.
Increases the cohesion of the fresh mix, reducing bleed water.
Improves the impact and abrasion resistance of the surface.
Increases the overall durability of the element by reducing permeability (fewer entry points for aggressive agents).

Does it affect the surface finish, or are the fibers visible?

No. Due to their small diameter and proper dispersion, the microfibers are virtually invisible on the finished concrete surface. Furthermore, being non-metallic, there is no risk of oxidation.

Does it replace crack control wire mesh?

Yes. r-micro is a technically and economically superior alternative to crack control mesh (the lightweight mesh used for shrinkage control, not the structural one). It offers homogeneous reinforcement in three dimensions, unlike mesh which only reinforces in a single plane and whose correct placement is difficult to guarantee.