Where are micro synthetic fibers used?

They are commonly used in industrial floors, slabs-on-grade, pavements, precast elements, shotcrete, mortar, render, and architectural concrete applications.

What is the recommended dosage for micro synthetic fibers?

Typical dosage ranges from 0.6–1.2 kg/m³ depending on the concrete mix and application. Mortar and render generally use 0.3–0.6 kg/m³.

How do micro synthetic fibers compare to macro fibers?

Micro fibers control early-age plastic shrinkage cracks and improve surface durability, while macro fibers provide post-crack structural performance. Both fiber types can be used together for comprehensive reinforcement benefits.

What are micro synthetic fibers used for in concrete?

Micro synthetic fibers are used to control plastic shrinkage cracking, reduce settlement cracks, and improve early-age durability in concrete and mortar.

What is the recommended dosage for micro synthetic fibers?

The recommended dosage is typically 0.6–1.2 kg per cubic meter of concrete, depending on crack-control and environmental requirements.

Do micro synthetic fibers affect concrete workability?

Properly dispersed microfibers have minimal impact on slump and finishing. A short mixing period ensures uniform distribution.

Can micro synthetic fibers replace welded wire mesh?

Micro synthetic fibers cannot replace welded wire mesh for structural reinforcement, but they can replace mesh used for temperature and shrinkage crack control.

Do micro synthetic fibers help reduce fire spalling?

Yes. Polypropylene microfibers melt under high heat, forming channels that relieve pore pressure and reduce explosive spalling.

Which concrete applications benefit most from microfibers?

Slabs, pavements, industrial floors, shotcrete, overlays, and precast concrete benefit significantly from microfiber use.

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Micro Synthetic Fibers for Concrete

Widely used in slabs, floors, pavements, precast elements

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Micro Synthetic Fibers

Micro Synthetic Fiber for Concrete Reinforcement

Q: What are micro synthetic fibers?

Micro synthetic fibers are polypropylene or polyester fibers added to concrete to control plastic shrinkage cracks, enhance early-age strength, and improve durability. They comply with ASTM C1116 and EN 14889-2 standards.

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PIONEER® Micro Synthetic Fiber

Micro Synthetic Fibers are high-performance polypropylene (PP) and polyester (PET) fibers designed to reduce plastic shrinkage cracking, enhance durability, and improve early-age performance in concrete and mortar.

They serve as secondary reinforcement, distributing stresses more evenly and minimizing crack formation during the critical curing phase.

PIONEER® offers a full range of micro fibers, including monofilament, fibrillated, ultra-fine, self-dispersing, hybrid, and polyester types—engineered for professional concrete performance.

PIONEER® Micro Synthetic Fiber Solutions

PIONEER® offers six types of micro fibers designed for different performance and application requirements.

HPM® PP Monofilament Polypropylene Fiber for improved tensile strength and crack resistance in fiber reinforced concrete

HPM® PP – Monofilament Micro Fiber

Monofilament polypropylene micro fiber

For general crack control and improved toughness

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HPM® PP Mesh Fibrillated Polypropylene Fiber for replacing wire mesh and enhancing concrete durability

HPM® PP Mesh – Fibrillated Mesh Fiber

Fibrillated mesh structure for multi-directional reinforcement

Ideal for industrial floors and pavements

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HPM® UF PP – Ultra-Fine Polypropylene

Ultra-fine fiber for superior finishability

Ideal for mortar, concrete, UHPC

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HPM® SD PP Self-Dispersing Polypropylene Fiber for dry mix mortar and fiber-reinforced concrete with excellent dispersion and crack control

HPM® SD PP – Self-Dispersing PP Fiber

No balling, rapid dispersion

Suitable for ready-mix, precast factories, shotcrete

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HPM® AR – Alkali-resistant Glassfiber

Chopped Alkali-Resistant Glass Fiber

AR glass Reinforcement for Concrete and GFRC

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HPM® PET Polyester Fiber for high-strength concrete applications as a durable fiber additive to improve crack resistance and performance

HPM® PET – Polyester Micro Fiber

PET micro fibers with higher heat resistance

Ideal for architectural concrete & fire-exposed structures

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Micro synthetic fibers help control early cracking.
But is that enough for long-term durability?

Early Crack Control Explore Advanced Fiber

What Are Micro Synthetic Fibers?

Micro synthetic fibers are thin (10–300 μm), short (6–19 mm) polymer fibers mixed into concrete to provide multidirectional reinforcement.
Unlike steel mesh or macro fibers, micro fibers primarily target early-age plastic shrinkage cracks, improve cohesiveness, and enhance resistance to impact and abrasion.

Key Functions：

Reduce plastic shrinkage cracks
Improve cohesion and reduce bleeding
Enhance early-age tensile strength
Increase durability and surface toughness
Improve concrete homogeneity and finish quality

Standards & Compliance：

ASTM C1116 – Type III Synthetic Fibers
EN 14889-2 – Class I Micro Fibers

Benefits of Micro Synthetic Fibers in Concrete

Crack Control Performance :

Fibers chemically inert and uniformly distributed, controlling:

Plastic shrinkage cracks
Temperature & drying shrinkage
Surface microcracks

Enhanced Durability :

Better resistance to impact, abrasion, and chipping
Reduced permeability and improved freeze–thaw durability

Improved Workability & Finish :

Smoother surface finish
Reduced segregation and bleeding

Not all microfibers are created equal.
Higher performance is possible—without changing your mix design.

Compare Fiber Types Discover the Upgrade

Where to Use Micro Synthetic Fibers

Micro fibers are suitable for nearly all concrete systems, including:

Industrial and Structural Uses

Slabs-on-grade

Pavements, sidewalks & driveways

Parking decks

Precast & Manufacturing

Precast panels and concrete elements

Pipes, blocks,

Rooftop materials

Mortar, Plaster & Repair

Renders, overlays, screeds

Crack repair mortars

Decorative and architectural concrete

Micro-synthetic fibers can be used to reinforce tunnels or shotcrete..avif

Tunnel & Shotcrete

Shotcrete & tunnel linings

Underground works requiring cohesion improvement

From basic crack control to structural performance.
What defines the next generation of concrete fiber?

See the Difference Explore NanoRebar

Why Choose PIONEER® as Your Concrete Fiber Supplier

Partner with a direct manufacturer with over 22 years of expertise in synthetic fiber reinforcement for concrete and mortar.

22 Years of Expertise in Fiber Reinforcement

PIONEER® provides consistent, high-performance fibers that ensure long-term success in concrete slabs, precast elements, industrial floors, and critical infrastructure projects, making us a trusted supplier in the global market.

1,000+ Projects in 20+ Countries

Our fibers are applied in major projects, including the Hong Kong-Zhuhai-Macao Bridge, Bangladesh Subsea Tunnel, Walmart Superstores, and metro systems, demonstrating our proven capability in fiber-reinforced concrete and mortar applications.

Direct Manufacturer, One-Stop Service

We provide complete technical support, including dosage optimization, mix design consultation, and on-site application guidance to ensure your projects succeed with fiber-reinforced concrete and mortar.

PIONEER® factory office building in Nanjing showcasing the company's headquarters and administrative facilities.

PIONEER® Headquarters

Aerial view of PIONEER® production facility in Nanjing, showcasing the company's modern factory and large-scale concrete fiber manufacturing capabilities.

26,500m² production base

Synthetic fibers manufacturing production line for fiber reinforced concrete, producing concrete fibers and fiber mesh reinforcement to reduce cracks and improve durability.

Advanced fiber dispersibility

Concrete fibers production line manufacturing reinforcement fiber for concrete and improving fiber reinforced concrete performance.

Exceptional tensile strength

Still using traditional microfibers?

Upgrade to high-performance fiber without increasing cost.

NanoRebar Fiber Reinforcement Inside Concrete.avif

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Why Choose Us?

Proven Expertise & Greater Savings

22 years of focus

on fiber reinforcement solutions.

5,000 tons yearly

from advanced manufacturing.

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with global product distribution.

1,000 projects proven

in diverse applications worldwide.

FAQ

Micro synthetic fibers are primarily used to control plastic shrinkage cracking, reduce settlement cracking, and enhance early-age durability in concrete. They help improve surface quality, reduce permeability, and provide better resistance to impact and abrasion.
Micro synthetic fibers are very fine (typically 6–40 μm) and designed for early-age crack control, while macro fibers are longer and thicker, intended to provide structural post-crack reinforcement, often replacing steel mesh or steel fibers.
High-quality monofilament fibers (such as HPM® PP microfibers) do not cause surface fuzzing when correct dosage and finishing methods are used. Fibrillated fibers may slightly increase surface texture but typically disappear during troweling or finishing.
Yes. They can be used in ready-mix concrete, precast, shotcrete, mortar, overlays, repair materials, ultra-thin toppings, and even decorative concrete.
Monofilament fibers → Best for finishing quality and plastic shrinkage control

Fibrillated fibers → Better bonding and early-age toughness

Blended types → Balance of performance and cost