Performance testing and standards for anti-static dust-free clothing
Dust-free clothes are also called anti-static clothes and clean clothes. The fabric is made of polyester filament fiber, warp or warp and weft inlaid Belltron® 9R series conductive fiber of Japan, which has excellent anti-static and dust-proof performance, and is widely used in anti-static areas and dust-free clean areas.
1: Anti-static performance testing
Anti-static is an important feature of dust-free clothing, especially in industries such as microelectronics, which have stricter requirements on the anti-static performance of clothing. The general test has two parts: surface resistance test and friction voltage test.
1. Surface resistance test
Principle: This test can verify the conductive effect of the conductive thread and whether the stitching process between the fabric and the fabric meets the requirements, such as the connection between the conductive threads. Test Conditions: Temperature: (20±5)0C Relative Humidity: (35±5)% Test Voltage: (100±5)V Test Time 15S Test Method: Place the tested work clothes on a special test bench (table resistance Greater than or equal to 103Ω), use a resistance tester to test it, usually need to test different points of work clothes, such as between a piece of fabric, between different pieces of fabric, between sleeves, between pants and pants, etc., Test result: take the geometric mean of 5 measurements
Surface Resistance Test Surface Resistance Tester
2. Triboelectric test
Principle: This test is mainly to verify whether the cloth itself can reach a specified stable value in a short period of time after accumulating some voltage through friction. Test conditions: Temperature: (20±5)0C Relative humidity: (35±5)% Test method: On a dedicated ESD test bench (grounded), the tester rubs the surface of the cloth with a certain force and speed times (usually 5-10 times), and then use the probe of a special voltage tester to aim at the rubbed part at a distance of about 5cm, and read the voltage value after the 5th second. Test result: friction voltage should be less than 100V
For the pollution particles attached to the inside and outside of the clean work clothes used in the clean room, the following four methods are used to measure:
1. Microscopic method (ASTM-F-51) The test probe is equipped with a filter diaphragm, directly connected to the suction metering pump, and the air volume passing through is 28L/min. During the test, let the air pass through the test clothing, capture the dust particles contained in the air on the filter membrane used for the test, observe and count the number of dust particles with a 400 times microscope. Read the number of particles 0.5-5 and above 5 on the filter membrane. There are 3.08mm grids printed on the filter membrane, and the number of particles in a grid can be read. 2. Counting method (ASTM-F-51 revised method)
Let air pass through the test clothing, and use a particle counter to measure the size and number of dust-generating particles. Place the sample on a stand with a metal mesh, use a sampler (replaced by a 47mm filter holder) for contact and suction, and the air volume passing through is 28L/min. 3. Helmke Drum Test
Put the sample into a rotating drum with an opening on the side and rotate it, sample the dust particles from the drum, measure the number of particles with a particle counter, and determine the level of cleanliness. The size of the rotating drum is 43cm×33cm, and there are 4 blades on the inside of the barrel, and the number of revolutions of the barrel is 10 rpm. 4. Vibration method
The sample is placed in a small chamber, and particles are generated by vibration and torsion, and measured by a particle counter. At the same time, the particles with large particle size (above 25) are captured on the filter membrane, and the number of particles is read out. The air volume is 3.5 ft/min (0.099m/mim), and the vibration frequency is 150 times/min. At present, there is no national standard for the dust-free performance test of clean work clothes in my country. You can refer to the Japanese Industrial Standard JIS-B-9923 studied by the Special Committee of the Japan Air Cleaning Association, and the American IES standard RP-CC-003-87-T. For the evaluation of dust-free performance, various industries can use it according to the clean workshop standards stipulated in the international standard ISO/TC209, combined with their respective cleanliness levels.
Performance testing and standards for dust-free clothing
Dust-free clothes are also called anti-static clothes and clean clothes. The fabric is made of polyester filament fiber, warp or warp and weft inlaid Belltron® 9R series conductive fiber of Japan, which has excellent anti-static and dust-proof performance, and is widely used in anti-static areas and dust-free clean areas.
1: Anti-static performance testing
Anti-static is an important feature of dust-free clothing, especially in industries such as microelectronics, which have stricter requirements on the anti-static performance of clothing. The general test has two parts: surface resistance test and friction voltage test.
1. Surface resistance test
Principle: This test can verify the conductive effect of the conductive thread and whether the stitching process between the fabric and the fabric meets the requirements, such as the connection between the conductive threads.
Test conditions: Temperature: (20±5)0C Relative humidity: (35±5)% Test voltage: (100±5)V Test time 15S
Test method: Place the work clothes to be tested flat on a special test table (table surface resistance is greater than or equal to 103Ω), and use a resistance tester to test it. Usually, it is necessary to test different points of the work clothes, just like a piece of cloth. Between pieces of fabric, between sleeves, between trousers and trousers, etc.
Test result: take the geometric mean of 5 measurements
Surface resistance tester
2. Triboelectric test
Principle: This test is mainly to verify whether the cloth itself can reach a specified stable value in a short period of time after accumulating some voltage through friction.
Test conditions: Temperature: (20±5)0C Relative humidity: (35±5)%
Test method: On a dedicated ESD test bench (grounded), the tester rubs the surface of the fabric several times (usually 5-10 times) with a certain force and speed, and then separates the probes of the dedicated voltage tester by 5cm Align the rubbed part left and right, and read the voltage value after the 5th second.
Test result: friction voltage should be less than 100V