Non Fluorinated Durable Water Repellent Wet Processing Specifications
Non-fluorinated DWR wet processing requires bath pH 4.0-5.5, WPU control, and core cure temperatures of 150-170°C with crosslinkers to pass 10 ppm fluorine limits.
C0 DWR
Fluorine Free Treatment
Chemical finishing agents based on polyurethane, dendrimer, or silicone technologies provide hydrophobic protection to synthetic and natural fabrics without the use of fluorinated compounds. Modern performance apparel lines utilise c0 dwr to meet strict environmental regulations and eliminate perfluorinated alkyl substances from the waste stream. This finish shields outer-shell garments against light rain and water-based spills while maintaining fabric breathability.
Hydrophobic Mechanism
Synthetic polymers create a microscopic matrix on yarn surfaces to increase the contact angle of water droplets. Because c0 dwr relies on hydrocarbon-based or silicone chemistries, the treated fabric sheds liquid water through physical surface tension rather than chemical fluorination. This molecular arrangement ensures that water beads up and rolls off the garment surface instead of wetting the base yarns.
Durability Constraint
Mechanical agitation during repeated laundry cycles gradually reduces the performance of the finish. Although c0 dwr performs well against water, it lacks the oleophobic properties of traditional fluorinated finishes, making the fabric vulnerable to oil-based stains, dirt accumulation, and sebum absorption. Industrial laundry tests measure this degradation by evaluating spray ratings after ten, twenty, or thirty home washes, and brands must adjust their performance claims to account for this rapid loss of water repellency under heavy daily wear, which often necessitates the frequent reapplication of aftermarket spray-on treatments.
Application Standard
Finishing mills apply these water repellents during the wet processing stage using foulard padding machines followed by high-temperature curing. The quality control checkpoint requires a minimum spray rating of eighty on the ISO 4920 scale after multiple wash cycles to verify finish durability. Brands specify these limits to guarantee that outdoor jackets sustain rain protection throughout their intended lifecycle.