Anti-cracking Polyester Fiber

Updated: 2026-09-24

Overview

Anti-cracking Polyester Fiber is an engineered synthetic fiber specifically developed to mitigate cracking in cementitious materials. As a modified polyester polymer, it bridges micro-cracks that form during the plastic shrinkage phase of concrete curing. The material gained prominence in the 1990s as a superior alternative to traditional steel mesh reinforcement for shrinkage crack control. Its widespread adoption in construction stems from consistent performance across temperature variations and compatibility with modern admixtures.

Physical and Chemical Properties

The fiber exhibits exceptional tensile strength (typically 500-800 MPa) and elastic modulus (10-15 GPa), allowing effective stress distribution in concrete matrices. Its hydrophobic nature prevents water absorption, ensuring dimensional stability in humid environments. Chemically, the fibers demonstrate remarkable resistance to alkalis (pH 12-13) and common concrete additives. Special surface treatments enhance bonding with cement paste, achieving 150-200% better adhesion compared to untreated polyester fibers. The material maintains stability in temperatures ranging from -40°C to 150°C without significant property degradation.

Main Applications

Primary use occurs in industrial flooring (dosage 0.9-1.8 kg/m³) where it controls plastic shrinkage cracks and reduces joint spacing requirements. Bridge deck applications benefit from its corrosion resistance, often replacing steel fibers in harsh environments. In shotcrete applications, the fibers reduce rebound by 15-20% while improving early-age crack resistance. Specialty blends are increasingly used in 3D printable concrete formulations to enhance green strength. The construction industry consumes approximately 65% of global production, with growing adoption in precast elements and tilt-up panels.

Safety and Storage

While classified as non-hazardous, the fibers require careful handling to prevent airborne dispersion. OSHA recommends N95 masks when cutting fiber-reinforced concrete due to potential respiratory irritation from loose filaments. Optimal storage conditions involve maintaining relative humidity below 60% at 10-30°C. Bulk shipments should be protected from UV exposure, which can gradually reduce tensile strength. Shelf life typically exceeds 24 months when properly stored in original packaging. Fire safety precautions should follow standard polyester fiber guidelines (autoignition temperature ~450°C).

B2B Procurement Guide

Quality verification should include ASTM C1116 testing for fiber-reinforced concrete and EN 14889-2 certification for synthetic fibers. Reputable suppliers provide batch-specific test reports covering tensile strength, elongation, and alkali resistance. For large-scale projects, consider on-site testing of trial mixes to confirm fiber dispersion characteristics. Procurement contracts should specify packaging requirements (typically 20-25kg UV-resistant bags) and minimum order quantities. Leading manufacturers offer technical support for dosage optimization based on specific mix designs and application requirements.