Household Appliance Inspection | Electric Shaver Inspection Standards and Methods

Classification of electric shavers

By power supply mode

1. Dry cell shaver : powered by disposable batteries, highly portable

2. Rechargeable shaver : built-in rechargeable battery, needs to be charged regularly

3. AC shaver : plug in directly, no batteries required

Classification by blade movement

1. Rotary shaver : The blades rotate, suitable for sensitive skin

2. Reciprocating razor : The blade moves back and forth in a straight line, making shaving more efficient

Third-party inspection core standards

1. Appearance quality requirements

1. Plastic/Bakelite parts :

   • There are no obvious defects such as cracks and deformation on the surface

   • No sharp burrs on the edge (touch test)

2. Metal Parts :

   • The coating should be uniform and free of defects (spots, bubbles, peeling, etc.)

   • Non-blade head parts must pass a 24-hour salt spray test (to verify anti-rust performance)

3. Surface treatment :

   • No cracking or peeling of the coating

   • Printed logo is clear and does not fade (alcohol wipe test)

2. Structural safety requirements

1. Protective devices :

   • Must be equipped with a knife net protection cover (dust-proof and damage-proof design)

   • The opening and closing mechanism must pass 500 durability tests

2. Running status :

   • Detection of fit between knife net and blade (no abnormal friction sound)

   • The vibration amplitude of the whole machine is ≤0.5mm (measured by high-speed camera)

Key technical indicators detection

1. Electrical safety performance

• Comply with standards : GB/T 4706.9-2024

• Key test items :

  • Insulation resistance ≥ 2MΩ (500V megohmmeter test)

  • Leakage current ≤ 0.25mA

2. Work performance test

3. Quality of core components

Knife net/blade hardness standard :

• Carbon steel material :

  • Knife net ≥ 543HV

  • Blade ≥ 664HV

• Stainless steel material :

  • All parts ≥ 400HV

Detection method :

1. Use Vickers hardness tester to test 3 points near the cutting edge

2. Take the average value for judgment (±5% error is allowed)

4. Sharpness test

Nylon wire shearing test process :

1. Sample preparation :

   • Use φ0.1mm PA612 nylon wire (breaking strength 4.07N)

   • 10 pieces fixed side by side into a bundle (width < 1cm)

2. Testing process :

   • Contact the knife net at a speed of 1mm/s

   • After 3 seconds, observe the incision under a microscope

   • Repeat the test 3 times in different areas

3. Qualification determination :

   • Curling root rate <15%

   • No rolling stop

Common quality problems and solutions

1. The roughness of the knife mesh exceeds the standard (＞Ra0.4μm):

   • Recheck using a surface profiler

   • Batch problems require adjustment of polishing process

2. Abnormal noise :

   • Check the motor bearing lubrication

   • Verify the concentricity of the cutter head assembly (tolerance ≤ 0.1mm)

3. Charging failure :

   • Test the charging port continuity

   • Monitor whether the charging curve complies with the specification

Inspection Notes

1. Environmental Control :

   • The test room temperature was maintained at 20±5℃

   • Relative humidity 45%-75%RH

2. Sampling criteria :

   • AQL Level II (Major defects 0.65%)

   • Minimum sampling quantity 32pcs (when batch ≤500)

3. Document Verification :

   • Confirm that the RoHS/REACH test report is within the validity period

   • Check the completeness of the warning labels in the instruction manual

Through a systematic testing process, the quality and performance of electric shavers can be comprehensively evaluated to ensure that the products meet international standards and provide professional technical support for purchasing decisions. It is recommended that brand owners cooperate with laboratories with CNAS qualifications to obtain authoritative test reports.

We provide professional third-party inspection services to ensure that the tableware and kitchenware products finally delivered meet the standards, regulations and target market requirements, avoid disputes due to product quality issues, and improve supply chain management and quality control measures.