100% virgin polypropylene microfiber engineered to control plastic shrinkage cracks, boost impact resistance, and replace wire mesh in concrete slabs, precast, plaster — and rebound-reducing reinforcement in shotcrete and tunnel linings.
Polypropylene fiber for concrete is a high-performance synthetic microfiber added to fresh concrete and mortar to control plastic shrinkage cracking, improve impact and abrasion resistance, and enhance long-term durability. Each kilogram contains millions of discrete filaments that uniformly distribute throughout the matrix, bridging microcracks before they propagate.
Virgin polypropylene fiber — produced from 100% new resin, not recycled flakes — guarantees consistent tensile strength (≥500 MPa), uniform 30–32 μm diameter, and predictable dispersion. This is the grade specified by ready-mix producers, precast plants, and tunnel contractors worldwide.
In polypropylene fiber for shotcrete applications, the fibers also reduce rebound loss, improve cohesion of the sprayed mix, and provide passive fire-spalling resistance — a critical safety feature in tunnels, mines, and underground structures.
Three standard lengths cover the most common concrete and shotcrete applications. Custom lengths, packaging, and OEM branding available upon request.
| Parameter | PF-6 (Micro) | PF-12 (Standard) | PF-19 (Macro) |
|---|---|---|---|
| Recommended Use | Plaster, render, mortar joints, fiber-reinforced render | Slabs on grade, precast, screeds, shotcrete (wet mix) | Industrial floors, tunnel lining shotcrete, slope stabilization |
| Material | 100% Virgin Polypropylene | ||
| Length | 6 mm ±1 | 12 mm ±1.5 | 19 mm ±2 |
| Diameter | 30–32 μm | ||
| Tensile Strength | ≥500 MPa | ||
| Modulus of Elasticity | ≥3,500 MPa | ||
| Specific Gravity | 0.91 g/cm³ | ||
| Melting Point | 160–170 °C | ||
| Ignition Point | ≥590 °C | ||
| Acid / Alkali Resistance | Excellent | ||
| Dosage | 0.6–0.9 kg/m³ | 0.9–1.2 kg/m³ | 1.0–2.0 kg/m³ |
| Packaging | 0.9 kg water-soluble bags / 9 kg cartons / 1,000 kg big bags | ||
| Compliance | EN 14889-2 · ASTM C1116 · GB/T 21120 | ||
From residential slabs to tunnel linings, virgin polypropylene fiber delivers measurable performance gains across concrete, mortar, and shotcrete systems.
Controls plastic shrinkage cracks in residential, commercial, and industrial floor slabs. Replaces welded wire mesh for crack control in non-structural slabs on grade.
Improves impact resistance and edge durability of pipes, manhole covers, hollow-core slabs, and segmental linings. Reduces demoulding damage.
Polypropylene fiber for shotcrete reduces rebound (typically from 30% to <15%), improves cohesion, and provides fire-spalling resistance in tunnels and mine galleries.
6 mm microfiber minimizes hairline cracks in wall plaster, external render, and masonry mortar. Improves bond strength and weathering resistance.
Sprayed concrete (shotcrete) demands fiber reinforcement that disperses instantly, resists pump blockage, and delivers energy absorption in tunnel linings, slope stabilization, and mine support. Virgin PP fiber is the contractor-preferred choice — here's why.
| Performance Factor | Virgin PP Fiber | Steel Fiber | Wire Mesh |
|---|---|---|---|
| Plastic shrinkage crack control | Excellent | Limited | None |
| Fire spalling resistance | Yes (melts, vents steam) | No | No |
| Corrosion resistance | 100% | Rusts | Rusts |
| Equipment wear | Minimal | High (pumps/nozzles) | N/A |
| Installation labor | Lowest (mixed in) | Medium | High (placement) |
| Rebound reduction | Yes | Increases rebound | N/A |
| Cost per m³ (typical) | $3–6 | $15–25 | $5–10 + labor |
| Compliance EN 14889-2 | Class I | EN 14889-1 | N/A |
Recycled PP fiber may look identical in the bag, but its inconsistent melt-flow index, weak tensile strength, and variable length cause clumping, premature fiber pull-out, and unpredictable crack control. For spec-critical projects, virgin PP fiber is the only defensible choice.
Whether for industrial floors, precast elements, repair mortars or general concrete reinforcement, TenaBrix provides not only this microfiber but also a full range of fiber solutions to meet diverse construction needs.
Macro Synthetic Fibers is high quality polypropylene in large structure of fibers, produced by special molding process and surface modification to increase toughness of concrete.
The Fibers for Cement Concrete and Mortar and other standards. With stable performance and strong adaptability, it is the preferred material for enhancing crack resistance in concrete engineering.
Twisted fibers are 3x more effective at controlling plastic shrinkage cracking than standard straight fibers—making them ideal for high-stress projects like precast components, tunnels, and industrial floors.
Six performance advantages that explain why ready-mix producers and tunnel contractors in 30+ countries rely on our virgin PP fiber.
Millions of virgin PP filaments per kg bridge plastic shrinkage cracks before they form, reducing crack width by up to 80% in the first 24 hours of curing.
Industrial floors and precast elements see 20–40% improvement in impact resistance, extending service life in warehouses, parking decks, and heavy-traffic zones.
PP fibers melt at 160 °C, creating steam-venting microchannels that prevent explosive concrete spalling during tunnel fires — a critical safety feature.
Unlike steel fibers or mesh, virgin PP fiber is immune to chloride and sulfate attack — ideal for marine, water-retaining, and chemical-exposure environments.
Water-soluble bags go straight into the truck mixer or batching plant. No special equipment. Disperses in 60–90 seconds. Zero impact on slump at correct dosage.
Own Jinan factory. No trading layers. ISO 9001 quality system. Free 1 kg sample. MOQ from 500 kg. 7–10 day lead time. FOB Qingdao / CIF / DDP available.
From sample request to first delivery in as little as 21 days. Our engineers support you at every stage.
Email us to receive a free 1 kg sample with full COA, MSDS, and technical datasheet in English.
Run slump, crack, and strength tests in your lab. Our engineers help optimize dosage for your mix design.
Place a trial order (500 kg–1 ton) for full-scale plant or site validation. Lead time 7–10 working days.
Scale to regular delivery with guaranteed batch consistency. Annual supply contracts available with price lock.
Polypropylene fiber is added to concrete at 0.6–1.2 kg/m³ to control plastic shrinkage cracking, improve impact and abrasion resistance, and enhance fire spalling resistance. It is widely used in slabs, precast elements, shotcrete tunnel linings, plasters, and renders.
Virgin polypropylene fiber is produced from 100% new resin with consistent tensile strength (≥500 MPa), controlled diameter (30–32 μm), and predictable dispersion. Recycled PP fiber often has variable melt flow, weaker tensile strength, and inconsistent length, leading to clumping and unreliable crack control.
For shrinkage and temperature crack control in non-structural slabs on grade, polypropylene fiber can replace welded wire mesh when dosed at 0.9–1.2 kg/m³. Structural reinforcement (load-bearing slabs, beams, columns) still requires steel rebar designed by a licensed engineer.
For wet-mix and dry-mix shotcrete, 12 mm and 19 mm PP microfibers are most common. 12 mm fibers disperse easily and reduce rebound; 19 mm fibers offer higher toughness and are preferred for tunnel linings, slope stabilization, and mine galleries.
Typical dosage is 0.6–0.9 kg/m³ for crack control in slabs and plaster, 0.9–1.2 kg/m³ for industrial floors and precast, and 1.0–2.0 kg/m³ for shotcrete and high-impact applications. Always run a trial batch to verify workability and finishing.
At recommended dosage, virgin PP fiber has minimal impact on slump (≤10 mm loss) and does not reduce compressive strength. Slight increase in water demand (~1–2%) is normal and is compensated by your admixture supplier. Excessive dosage above 2.0 kg/m³ can reduce workability.
Our virgin PP fiber complies with EN 14889-2 (Class I — microfiber), ASTM C1116 (Type III synthetic fiber-reinforced concrete), and GB/T 21120 (Chinese national standard). Full COA, MSDS, and third-party test reports available upon request.
Standard packaging: 0.9 kg water-soluble bags in 9 kg cartons, or 1,000 kg big bags. Custom packaging and OEM branding available. Shipping: FOB Qingdao, CFR, CIF, or DDP. Lead time 7–10 working days for stock grades, 20 days for custom lengths.
Get a free 1 kg sample, full technical datasheet, and direct support from our application engineers. Discover why ready-mix, precast, and tunnel contractors in 30+ countries trust Tenabrix™ PP fiber.
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