Three Key Hard Indicators to Focus on When Purchasing PA66 Nylon Brush Filaments

As a brush filament manufacturer, we deeply understand that the quality of brush filaments in the market varies significantly. Many purchasers only ask about price while overlooking the key indicators that determine the lifespan of the finished product. To judge the authenticity and quality of PA66 brush filaments, please focus on the following three points:

1. Diameter Tolerance and Consistency

High-quality PA66 brush filaments have extremely high requirements for production processes. The diameter tolerance should be controlled within ±0.005mm. If the filaments have inconsistent thickness, holes will have varying tightness during tufting, leading to easy hair loss during use. We adopt high-precision extrusion technology and online laser diameter measurement to ensure the roundness and diameter stability of every filament, thereby guaranteeing the flatness and tightness after tufting.

2. Resilience Rate and Fatigue Resistance

Industrial brushes most fear "soft feet" — brush bristles that lie down and cannot recover after a period of use. Although PA66 material itself has good toughness, the drawing ratio during the processing determines the final resilience performance. Brush filaments produced by reputable manufacturers should maintain an elastic recovery rate of over 90% after millions of reciprocating bending tests in the laboratory. This means the brush can still closely fit the workpiece surface after long-term service.

3. Environmental Protection and Flame Retardant Certification

With the intensification of global trade barriers, exported brush filaments must possess an "international passport". Genuine virgin PA66 nylon brush filaments can easily pass RoHS (Restriction of Hazardous Substances), REACH (Chemical Registration), and UL94 V0 flame retardant certifications. If recycled materials or excessive fillers are used, not only will they fail the V0-level combustion test, but they may also produce toxic black smoke and drippings when burning.