ReinStrong 40 mm Macro Synthetic Fiber for Concrete Floors

What is ReinStrong

ReinStrong is a stiff polypropylene monofilament, 40 mm long and 0.8 mm in diameter, for structural reinforcement of concrete. It disperses evenly throughout the entire mix and takes over the load once a crack forms. Steel mesh works in only one plane and often ends up in the wrong place. ReinStrong reinforces concrete in three dimensions, from the bottom of the slab right up to the surface.

The fiber’s ribbed, wavy surface bonds firmly to the cement matrix. As a result, cracks don’t open up, and the concrete keeps its load-bearing capacity even after the first crack appears.

How macro fiber works

While the concrete is intact, the cement matrix carries the load on its own. When a microcrack forms, ReinStrong fibers “stitch” it together and keep it from opening.

This post-crack performance is exactly what EN 14651 measures as residual flexural strength fR1 and fR4. Engineers use these values when they include fiber in a slab design. The DoP dose of ReinStrong that provides fR1 ≥ 1.5 MPa and fR4 ≥ 1.0 MPa is 4.5 kg/m³.

Specifications

Material	polypropylene
Fiber shape	monofilament with a ribbed, wavy surface
Length	40 mm
Equivalent diameter	0.8 mm
Tensile strength	550 MPa
Modulus of elasticity	11 GPa
Density	0.91 g/cm³
Melting point	~160 °C
Number of fibers in 1 kg	~62,000
Alkali and acid resistance	high
Class per EN 14889-2	II (macro)
DoP dose (fR1 ≥ 1.5 / fR4 ≥ 1.0 MPa)	4.5 kg/m³

Technical data sheet (TDS) and quality certificate available on request.

Benefits

Instead of steel mesh

No need to tie steel mesh, lay it out and lift it onto rebar chairs. You save time on reinforcing and cut crew shifts.

Won't rust

No corrosion, no rust stains on the surface and no spalling of the concrete cover. Suitable for aggressive environments, salts and chemicals.

Safe to handle

Doesn't cut workers' hands the way steel fiber does. A bag weighs a few kilograms, not hundreds.

Easy on equipment

Much less wear on pumps, hoses and drums than with steel fiber. No magnetic or electrical interference.

Easier logistics

The dose for 1 m³ weighs several times less than steel fiber.

Lower carbon footprint

Compared with steel reinforcement.

How and where to use ReinStrong

Where to use it

Industrial and warehouse floors, slabs on grade
Outdoor paved areas, parking lots, roads, sidewalks
Foundation slabs for private homes
Precast concrete: drainage channels, rings, slabs, fences
Shotcrete: slope stabilization, tunnels, mines
Fortifications and protective structures

When not to use it

Does not replace structural rebar in load-bearing members (suspended slabs, beams, columns) without engineering calculations.

We are upfront about the limits of each fiber, so you don't overpay or end up with cracks.

Worker levelling fresh concrete with a vibrating screed while pouring a slab on grade

Recommended dosage

Application	Dosage
Slabs on grade, light-duty floors	2–3 kg/m³
Industrial floors, outdoor paved areas	4–5 kg/m³
Precast concrete	5–6 kg/m³
Shotcrete	6–8 kg/m³

The exact dosage depends on loads, thickness, concrete grade and subbase. We will match it to your project.

How to add it to concrete

At the batching plant: add the fiber together with the aggregates or with the first portion of water.
In a truck mixer: add the fiber to the drum at the start of loading. If you add it to ready-mixed concrete, mix at maximum drum speed for another 5 min (at least 70 drum revolutions).
Workability: macro fiber slightly reduces slump. Compensate with a superplasticizer (PCE), not with water. Recommended slump at discharge: S3 or higher.
Placing: vibrating screed or laser screed.
Finishing: use magnesium (not wooden) floats, trowel as late as possible and keep the blades flat. This embeds the fibers so they don't come up to the surface.
Before your first project, make a trial batch.

ReinStrong documentation

Click a document to enlarge it.

ReinStrong FAQ

Can I eliminate steel mesh or rebar entirely if I use ReinStrong?

For most slabs on grade and floors, yes, provided this is confirmed by engineering calculations. In load-bearing structures (suspended slabs, beams, columns), fiber complements structural rebar but does not replace it.

Will fibers stick out of the floor surface?

With proper troweling they are barely visible. Trowel later, with magnesium floats and flat blades.

How is ReinStrong different from ReinLite?

ReinLite is a micro fiber that protects fresh concrete against shrinkage cracks. ReinStrong is a structural monofilament fiber that works in hardened concrete under load.

How much ReinStrong do I need per 1 m³ of concrete?

From 2–3 kg/m³ for light-duty slabs on grade to 6–8 kg/m³ for shotcrete. The DoP dose, which provides fR1 ≥ 1.5 MPa and fR4 ≥ 1.0 MPa, is 4.5 kg/m³.

Become a ReinStrong distributor

We are looking for distributor partners in new markets and look forward to your request. Tell us about your company and market, and we will be glad to help with your order, the right fiber range and delivery to your country.