Household Appliance Inspection | Electric Toothbrush Inspection Standards and Methods

Electric toothbrush product overview and classification

As an important tool for modern oral care, electric toothbrushes use motors to drive the brush head to produce high-frequency vibration or rotational motion, which can increase the plaque removal rate by up to 40% compared to manual toothbrushes. According to market research data, the global electric toothbrush market size will exceed US$5 billion in 2023, with an annual growth rate of 8-10%.

Product classification standards

1. Classification by applicable population

• Adult electric toothbrush : brush head length ≤42mm, bristle height 5-14mm

• Children's electric toothbrush : brush head length ≤ 29mm, bristle height 5-12mm

2. According to the brush head assembly method

• Removable brush head : requires plug-in or rotating connection structure

• Non-detachable brush head : one-piece design

Appearance quality inspection standards

Core testing items

Special process requirements :

• There is no virtual welding crack in the ultrasonic welding part

• No oxidation on the charging port

• Clear waterproof mark (IPX7 level needs to be specially marked)

Dimensional specification inspection specifications

Key size parameters

Adult electric toothbrush :

• Rough surface length: ≤42.0mm

• Rough surface width: ≤18.0mm

• Brush head thickness: ≤18.0mm

• Height of special-shaped hair: 5.0-14.0mm

Children's electric toothbrush :

• Rough surface length: ≤29.0mm

• Monofilament diameter: ≤0.18mm

• Flat hair height: 5.0-11.0mm

Testing tools :

• Digital display vernier caliper (accuracy 0.01mm)

• Laser distance meter (for round brush head only)

• 3D profile scanner (special-shaped brush head)

Physical performance testing solutions

Durability test items

1. Brush head temperature resistance test

• 50±2℃ constant temperature water bath for 20 minutes

• After taking out, check the deformation rate ≤5%

2. Connection structure strength

• Insertion type : Tensile test ≥15N (children's version)/5N (adult version)

• Rotary type : Torque test ≥ 0.15N·m (children's version) / 0.05N·m (adult version)

3. Switch life test

• Non-detachable version: 500 opening and closing cycles

• Removable version: 5000 opening and closing cycles

• After the test, the function is normal, and the contact resistance change is ≤10%

Noise Control Standards

• No-load running noise ≤72dB(A)

• Test environment: semi-anechoic chamber

• Measuring distance: 1m circle 6 points to take the average value

Key points of electrical safety testing

1. Waterproof performance

• IPX7: 1 meter deep water for 30 minutes without water ingress

• Charging port insulation resistance ≥ 10MΩ

2. Battery safety

• Overcharge/overdischarge protection test

• Cycle life ≥ 300 times (capacity retention rate ≥ 80%)

3. Electromagnetic compatibility

• Radiated disturbance ≤30dBμV/m (30-1000MHz)

• Electrostatic discharge immunity ±8kV

Packaging and labeling specifications

Minimum sales packaging requirements

Essential elements :

• Product name and model

• Manufacturer Details

• Implementation standard number (such as GB/T 40362-2021)

• Age warning label (children's version)

• Waterproof grade mark

• Charging voltage/time description

Transport packaging :

• Drop test height ≥80cm

• Vibration test: 3Hz-100Hz sweep frequency for 1 hour

• Stacking load ≥ 5 layers (72 hours)

Common quality defect handling

1. Bristle Shedding :

   • Check the matching degree between the implant pore size and the brush wire

   • Verify hot melt adhesive curing parameters (temperature ±5°C)

2. Abnormal noise from the motor :

   • Check the dynamic balance of the rotor (eccentricity ≤ 0.05mm)

   • Verifying gearbox grease fill level

3. Charging failure :

   • Test charging coil impedance (deviation ≤ 15%)

   • Check the waterproof sealing of PCB board

Inspection process suggestions

1. Sampling plan :

   • AQL 1.0 (major flaws)

   • Batch ≤ 1000: 32pcs sampling

2. Detection order :
   Appearance inspection → Dimension measurement → Functional test → Durability test → Packaging verification

3. Report Format :

   • Contains comparison of measured data with standard limits

   • Attached are photos of defective samples and location diagrams

Through a systematic testing process, it can be ensured that electric toothbrush products comply with the requirements of the GB/T 40362-2021 "Electric Toothbrush" standard. It is recommended that purchasers entrust a third-party laboratory with CNAS qualifications to conduct key project verification, especially professional testing projects involving electrical safety and biocompatibility of oral contact materials.

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.