Industry Standard for Electric Shavers

• Electric shaver: Use electricity to drive shaving appliances for shaving.
• Mains shaver: Electric shavers powered directly by mains power sources.
• Rechargeable shaver: Electric shaver powered by a rechargeable battery inside the shaver.
• Dry battery shaver: Electric shaver powered by a dry battery.
• Rotary shaver: Electric shaver in which the blade moves in rotation.
• Vibratory shaver: Electric shaver moving the blade in reciprocating motion.
• Washable shaver: The handheld portion of the shaver can be cleaned under the tap.
• Wet shaver: The handheld portion of the shaver can be used in a bath or shower.
• Shaving head: A shaving component composed of a knife net and a shaver blade.
• Trimmer: Electric shaver accessory, used to trim special facial hair, such as beard on lips and whiskers.

According to the power supply mode, it is divided into:

• Dry battery-type shaver
• Charging shaver / Rechargeable razor
• An AC shaver

The movement mode of pressing the moving blade is divided into:

• Rotary shaver
• Vibratory shaver

There are two basic types of electric shaving systems: rotary and linear.

According to cord mode, it is divided into

• Cord razor / shaver
• Cordless razor / shaver

• Application Environment: This electric shaver is designed for use in a general indoor setting or similar environments. It should be used in areas where there is no risk of explosive mediums, corrosive metals, gases that can damage insulation, or conductive dust. The ambient temperature should range between 0°C and 40°C.
• safety requirements: The safety requirements of the electric shaver shall comply with the provisions of GB 4706.1 and GB 4706.9.
• Start performance: The electric shaver shall start smoothly at 0.9 times the rated voltage.
• The temperature rise of the knife net: Conduct the test according to the method specified in 4.2 and the temperature rise of the electric shaver net shall not be greater than 30K. (Note: It is generally believed that when the temperature rise of the knife net exceeds 30K, the knife net will feel a burning pain when it contacts the skin.)
• Hardness of the knife nets and blades: Conduct the test according to the method specified in 4.3 and the hardness of the electric shaver net and blade shall comply with the provisions specified in Table 1.

Table 1: Hardness of the knife mesh and the blade

• Knife net roughness: Conduct the test according to the method specified in 4.4, and the outer surface roughness of the electric shaver shall not be greater than Ra 0.40. (Note: This requirement does not apply to surface mesh with densely arranged convex and concave shapes.)
• Sharpness: Conduct the test according to the method specified in 4.5, when the 612 # nylon wire called 0.1 mm, the nylon wire should be cut and not stopped, and the curling root rate should be less than 15%.
• Noise: When the electric shaver works, the knife net and the blade should be evenly fitted with the friction, and the sound should be harmonious, with no impact and irregular noise. Then conduct the test according to the method specified in 4.6, and the noise and sound power level of the electric shaver shall not be greater than 75 dB.
• Use in to connect the power supply: Carry out the test according to the method specified in 4.7. After the pin is rolled out, the front end of the pin will not shrink when bearing the force of 60 N. Conduct the test according to the method specified in 4.7(A). After the pin is introduced and indented for 2000 times, it shall not be abnormal and completely connected, and can meet the requirements of 4.7(B).
• Time between failures: The electric shaver shall be tested according to the method specified in 4.8, and the total fault-free working time shall not be less than 60 h.
• Working hours after each full charge:The working time of charging electric shaver shall be tested according to the method of 4.9, and the cumulative working time shall not be less than 25 min. The working time of the dry battery type electric shaver after replacing the dry battery shall be tested according to the method of 4.10, and the cumulative working time shall not be less than 60 min.
• Appearance requirements:Plastic and rubber wood parts must be devoid of any visible flaws or sharp burrs. Except for the shaving head, all metal components requiring corrosion resistance should possess such properties. In case of a coating, it needs to be sleek, even, and spotless (nevertheless, prominent water marks or stains are unacceptable). Additionally, the coating must not exhibit hemp points, pinholes, bubbles, peeling, or dew bottom. Furthermore, it should be free from any protrusions, peeling, cracking, or similar defects.
• Structural requirement:Electric shaver shall be equipped with a protective cover or similar protective structure to protect the knife net.

• Unless otherwise specified, the test shall be conducted under general indoor ambient conditions of (20 ± 5) ℃.
• The accuracy of electrical measuring instrument used for test shall be no less than 0.5 during type test, and its accuracy shall not be less than 1.0 during factory inspection.
• The rated current of the DC voltage stabilizing power supply for the test shall not be less than 1 A, and the voltage stabilization accuracy shall not be less than 2%.
• The tested samples shall be tested in the use state as specified in the product specification.
• The test power supply shall be consistent with the power supply specified in the product. When the product has two or more power supplies, the relatively unfavorable one should be selected as the test power supply.
• Before and during the test, the blade should be lubricated with several drops of light oil and fully lubricated.
• Safety tests shall be conducted according to the method specified in GB 4706.1 and GB 4706.9.
• The performance test should commence by initiating the electric shaver three times, adhering strictly to the voltage specifications outlined in the preceding chapter. Each start should occur only after the motor has fully halted.

Apply 1.06 times the rated voltage to the electric shaver, and after 10 min of normal operation, measure the maximum temperature rise on the surface of the knife net.

The hardness of the blade and blade is determined by vicker hardness meter. The determination parts of the blade and blade are arbitrary three points near the blade mouth. The determination parts of the upper and lower blades are the three points in the neutral teeth, and the average value of the three points is calculated.

The surface roughness of electric shaver knife net should be measured by roughness tester or controlled by rough sample.

4.5 Sharp test

Figure 1 Schematic diagram of nylon silk placement

Figure 2 Schematic diagram of nylon coil

Figure 3 Schematic representation of the sharpness test area

After the electric shaver is fully charged, disconnect the power supply, start to the strongest mode gear according to the instructions for use, and start the examine.

Arrange 10 PA 612 nylon wires labeled as 0.1 mm in a tight row (1 as shown below, with a width of less than 1 cm) 4 mm to 6 mm from the tip of the nylon bundle (adhesive tape). The ted nylon silk bundles were inserted slowly into the specified test area at about 1 mm/s as required in Figure 3. Time ed when the nylon wire tip touching the knife net and the trial ended after 3s. The new nylon wire bundle was then tested on the next test area. After the specified test area, the first round of testing was completed and the nylon wire shear was observed under a microscope (30 x). The number of coiled roots K was calculated against the curve provided in the nylon coil determination chart (Figure 2).

The curling root number rate is calculated according to the following formula：

Rroll up=K / (region number N * 10) x 100%

The trials were repeated three times, and the arithmetic of the third curling root rate was averaged as the final curling root rate.

Note: Uncut nylon silk during the test is regarded as uncurled.

4.6 Sharp test

A. The hearing and touch senses of the test personnel were used for judgment.

B. The test method shall be as specified in IEC 60704-2-8, but use 1 m hemisphere to    measure the surface radius.

4.7 Test the pin for connecting the power supply

A. In the state of the pin connecting the power supply, a 60 N force is applied to the axis direction of the front end of the two pins, as shown in Figure 3, for 2 s.
B. Push-out and push-out test with (10-20) times / min (one push is called once).

Figure 2 Schematic diagram of nylon coil

4.8 Determination of the fault-free working time

• For AC electric shaver, apply rated voltage and stop cycle cycle for 5 min for 5 min.
• For the charging electric shaver, the rated frequency and rated voltage shall be charged at the specified charging time. After the charging, the test shall be stopped for 5min and 5min.
• For the dry battery type shaver, install the corresponding dry battery as required, and stop the test for 5 min cycle for 5 min.(Note: Lubricate the knife net with light oil every day.)
• There should be no fault before the total running time reaches 60 h.

4.9 The working time of the rechargeable electric shaver after each charge

After the battery of the charged electric shaver is fully charged and discharged, then the battery is fully charged according to the instruction manual, disconnect the charging connection, and stand for 1 h. Adjust the charged electric shaver to the strongest mode gear and cycle in no load for 5 min and 5 min until the electric shaver fails to operate and the test is over. Calculate the cumulative working time in min.

4.10 Dry battery electric shaver working time after dry battery replacement

An external DC power supply equivalent to the nominal voltage of the dry battery is used to power the dry battery electric shaver, which operates in the strongest mode for 5 min and stops in 5 min mode. During the cycle, use the electricity meter to monitor the electricity consumed by the electric shaver, εt(W.h), equal εtEqual to the reference dry battery level of ε0(W. And h), end the trial. Calculate the cumulative working time (XX minutes).

4.11 Appearance inspection

During the appearance inspection of electric shavers, both hand feel and visual inspection are key methods for discrimination. Inspectors should carefully examine the shaver’s exterior for any defects, such as scratches, dents, or discoloration.

4.12 Structural inspection

When conducting a structural inspection for electric shavers, visual inspection plays a crucial role. This involves carefully examining the shaver’s structural components for any signs of damage, wear, or defects. Inspectors should look for cracks, loose parts, or any other visible indications of structural issues.

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The electric shaver must undergo testing in accordance with this document, as well as GB4706.1 and GB4706.9 standards. Mass production can only commence after a formal appraisal has been successfully completed. Products are permitted to leave the factory solely after the manufacturer has successfully passed the factory inspection. The inspection process for the electric shaver consists of two parts: factory inspection and type test.

See Table 2 for the required inspection items, requirements and methods of the product factory inspection.

Table 2 Compulsory inspection items for factory inspection

The manufacturer like KingStar shall also conduct sampling inspection batch by batch. The items, requirements and methods of sampling inspection are listed in Table 2. The factory inspection sampling of electric shavers shall be GB / T 2828.1 in progress. The sampling batch batch, sampling plan, inspection level and qualified quality level shall be determined by the manufacturer and the ordering party through negotiation.

Table 3 Sampling inspection items of factory inspection

(Note: The unqualified electric shavers with defects in the factory inspection shall be submitted again for re-inspection after repair and rework, and can only leave the factory after passing the re-examination.)

A. Type testing must be performed in one of the following cases

• New product trial production and finalization identification;
• Normal production is conducted once a year;
• After the long-term production suspension, when the resumption of production;
• When the design, process, key components, raw materials have significant changes, may affect the product performance;
• When the sampled sample results are quite different from the last type test results;
• When the national quality supervision agency proposes the requirements for the type test.

B. The items of the type test shall be GB4706.1, GB 4706.9 and all items specified in this document.

C. Type test sampling shall be conducted as per GB / T 2829. Samples of type test shall be selected from the factory inspection products and can be grouped according to performance (this document) and safety (GB4706.1 and GB4706.9), but each group shall not be less than 3. If any of the samples fails in the test, double samples will be taken for the re-inspection. If there is still unqualified after the re-inspection, the type test will not pass and the factory inspection will be stopped. Normal production can be resumed after the reasons are analyzed, the treatment plan is put forward and the test is submitted again to pass the type test.

D. Products after type test should not be genuine products.

• Marking：Each electric shaver shall have a nameplate or a durability mark, which shall clearly mark the contents of Article 7.1 of the GB 4706.9-2008. For appliances powered by rechargeable batteries, clause 7.1 of GB 4706.1-2005 Annex B shall also be labeled. The single packing box of electric shaver shall be marked with the requirements of GB / T 5296.2.
• Operating instruction: Each electric shaver shall have instructions for use, which shall comply with the relevant requirements of GB / T 5296.2 and GB4706.1 and GB4706.9.
• Pack: The packaging of electric shavers shall meet the requirements of GB / T 1019.
• Transport: During the transportation process, rain, damp and violent collision are strictly prohibited.
• Keep in storage:Electric shavers should be stored in a ventilated, dry environment, the box should be 150 mm above the ground, and there should be no corrosive chemicals around.