How to Choose Micro Fibers for Concrete by Application

To choose micro fibers for concrete, begin with the required function and production process. Do not assume that monofilament polypropylene, fibrillated polypropylene, ultra-fine PP, self-dispersing PP, polyester, and alkali-resistant glass fibers are interchangeable.

Each type has a different material identity, geometry, dispersion behavior, and application boundary.

Choose Micro Fibers for Concrete by Required Funct ion

First define the problem the fiber is expected to address:

Early-age crack-control requirement

Fibrillated network geometry

Fine fiber distribution

Dry-mix dispersion

PET material specification

Alkali-resistant glass requirement

Fire-related or other project-specific requirement

If the design requires verified post-crack residual strength or structural reinforcement, a macro synthetic fiber or another engineered system may be more appropriate.

Match Fiber Type to the Application

Monofilament PP fibers are commonly evaluated for early-age crack-control applications in concrete and mortar.

Fibrillated PP fibers open into a network-like form during mixing and should be assessed for dispersion, workability, and the intended application.

Ultra-fine PP fibers may be considered where fine geometry and a high fiber count are desired.

Self-dispersing PP fibers are designed for production systems where rapid and consistent distribution is important.

Polyester fibers may be selected where PET material properties or project specifications are required.

AR glass fiber is not a synthetic polymer fiber. It may appear in the same selection range because it serves specific GFRC and cementitious applications.

Verify Before Selecting a Product

Review:

Current TDS and SDS

Fiber material and geometry

Recommended dosage

Mixing sequence

Application limitations

Relevant test data

Trial-batch results

Explore the complete micro synthetic fibers for concrete selection range and follow the relevant product page for product-specific data.

Selection Boundary

No single micro fiber is best for every concrete or mortar application. Final selection should be based on the required function, representative testing, and project approval.

Sources: ASTM C1116/C1116M · ACI PRC-544.1R-96