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Material Authenticity: Matches nominal specifications (animal hair or synthetic fiber).

Single Hair Diameter: Follows standard brush parameters.

Moisture Content (Animal Hair): 8% – 12%.

Odor: Zero chemical pungent odor.

Tufting Density: Matches design value ±5\% (e.g., 1500 hairs/cm²).

Hair Alignment: Tip flatness ≤0.3 mm.

Glue Penetration: Zero glue overflow to the functional hair area.

Shedding Rate: ≤3 hairs lost after simulated use 10 times.

Tuft Fastness: Single hair pull-out force≥ 0.15 N.

Resilience: ≥90 recovery within 5 seconds after 90° bending.

Chemical Resistance: No deformation after immersion in 75% alcohol for 10 minutes.

Material: Matches Al, Cu, or PP specifications.

Diameter: Follows standards within 0.05 mm.

Wall Thickness: ≥ 90% of nominal value.

Surface: Anodized film ≥10μm.

Tufting Glue Gap: Upper inner diameter minus hair root = 0.3 – 0.8 mm.

Handle Interference: Lower inner diameter = handle diameter* 0.92±0.1 mm.

Perpendicularity: Angle between hair center line and handle  ≤2°.

Load Bearing Test: 500g static load for 10 minutes with zero deformation or detachment.

Drop Test: 1-meter height drop onto a concrete floor 3 times with no cracking.

Salt Spray Test (Metal): 48 hours of neutral salt spray with zero red rust.

Wood Moisture Content: 8% – 12% to prevent warping.

FSC Certification: Valid certificate and traceable batch records.

Diameter & Length: Matches design value within ±0.2 mm.

Surface Roughness: Ra≤1.6μm for a smooth hand feel.

Coating Adhesion: Cross-hatch test must be ≥ Class 4B.

Logo Clarity: Screen printing or hot stamping must have zero broken lines or shifts.

Weight Balance: Brush head to handle weight ratio is approximately 3:7.

Bending Strength: Withstands 5 N*m torque with zero breakage.

Drop Test: 1-meter height drop 3 times with no cracking.

Heavy Metal Migration (Children Line): Pb < 90 ppm, Cd< 75 ppm.