GB/T 12624-2020Hand protection - General test methods (English PDF)

4.1 Harmlessness test method

4.1.1 pH test The specimen shall be taken from the glove palm. If the material of other parts of the glove is different from that of the palm, sampling and testing of other materials shall be carried out at the same time. If the glove is composed of multiple layers, it shall be tested as a whole. Leather gloves are tested according to the method specified in QB/T 2724. Textile material gloves are tested according to the method specified in GB/T 7573.

4.1.2 Hexavalent chromium test Leather materials are tested in accordance with the method specified in GB/T 22807. If gloves contain different types of leather materials, all types of leather shall be tested separately; and the highest value of all test results shall be taken.

4.2.3 Glove width test The glove width is measured by a ruler with an accuracy of no less than 0.1mm. When measuring, the glove shall be naturally placed flat on the test platform; and the shortest distance of the glove palm shall be measured 20mm upwards from the bifurcation of the thumb and index finger of the glove. The result is accurate to 1mm.

4.3 Test methods for putting-on and taking-off time

4.3.1 Quantities and conditions of specimens The specimens are 3 pairs of new gloves of the same specification, without any softening treatment (such as tapping or squeezing, etc.). It shall be placed for at least 24h under the conditions of (23±2)°C and relative humidity (50±5)%.

4.3.2 Test equipment A timer with an accuracy of 0.1s.

4.3.3 Test procedures The test shall be carried out by 1 wearer and 1 timekeeper. The wearer shall start the test after understanding the requirements for wearing gloves. The size of the wearer's hand shall match the size of the glove under test. The specimen shall be placed on a platform that is easy to pick up before testing. The putting-on time counts from the wearer picking up the glove from the platform to showing the wearing state to the timekeeper after the putting-on is completed. The taking-off time counts from both hands of wearer completes the putting-on gloves to the wearer placing the gloves on the platform. NOTE: In order to preserve the test procedures, video recording can be used as a supplement.

4.3.4 Test results The putting-on and taking-off time of each pair of specimens shall be recorded separately; and the arithmetic mean of the 3 pairs of specimens shall be calculated. The arithmetic mean of putting-on and taking-off time shall be rounded-off to an integer.

4.4 Dexterity test methods

4.4.1 Quantities and conditions of specimens The specimens are 2 pairs of new gloves of the same specification, without any softening treatment (such as tapping or squeezing, etc.). It shall be placed for at least 24h under the conditions of (23±2)°C and relative humidity (50±5)%.

4.4.2 Test equipment 5 pieces of stainless-steel test rods. Each is 40mm long; and has a diameter of 5.0mm, 6.5mm, 8.0mm, 9.5mm, and 11.0mm, respectively.

4.4.3 Test procedures Place the test rod on a flat surface; and a wearer whose hand size matches the glove puts on the glove and picks up the test rod with the index finger and thumb. The wearer shall pick up the test rod smoothly and continuously 3 times within 30s.

4.4.4 Test result Record the diameter of the smallest test rod that can be picked up after 4 tests in accordance with the test method specified in 4.4.3, which is the test result.

4.5.1 Water vapor permeability test of leather gloves

4.5.1.1 Principle Fix the leather test piece at the mouth of the test bottle containing the solid desiccant; the test bottle moves under the specified temperature and humidity conditions; and the water vapor is absorbed by the solid desiccant through the leather specimen. Weigh the test bottle within the specified time to determine the weight of water vapor absorbed by the desiccant through the leather in this period of time.

4.5.1.2 Test equipment and materials The test equipment and materials consist of the following parts:

a) Test bottle. as shown in Figure 2. Equipped with a threaded cap, the cap has a round hole with a diameter of 30mm; and the round hole is the same size as the inner diameter of the bottleneck. The plane of the bottle mouth is perpendicular to the inner wall of the bottleneck.

b) Test bottle holder. Driven by a motor, it rotates at a speed of (75±5) r/min. The test bottle is mounted on this circular holder; the axis of the test bottle is parallel to the axis of the circle; and the distance between the two axes is 67mm (see Figure 2). 1 - top cover; 2 - gasket; 3 - sample; 4 - base. Figure 3 - Water Vapour Absorption Test Equipment

4.6.3 Test procedures Test environment temperature (23±2)°C, relative humidity (50±5)%. Weigh the pre-treated specimen first; and then place the sample on the base of the test equipment; fill 50cm3 of water in the lower cover. Note that the inner surface of the glove shall be placed facing downward. Put the sealing ring, cap the top cover; and tighten the fixing bolts gently. After 8h, remove the top cover; quickly take out the specimen and weigh it.

4.6.4 Test result Water vapor absorption is calculated as the ratio of weight gain to the surface area of the specimen. The value is expressed in mg/cm2; and the calculated result is expressed to one digit after the decimal point. The result is the minimum of the test results of 3 specimens.

4.7 Water resistance

4.7.1 Water resistance test of leather gloves Test according to the method specified in GB/T 22890.

4.7.2 Water resistance test of textile material gloves Test according to the method specified in GB/T 4744.

4.8 Test methods for gripping performance

4.8.1 Principle The ability of the tester to pull the rope without gloves is compared with the ability of the same person to pull the rope after wearing the gloves to judge the gripping performance of the gloves.