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Anti static testing of protective clothing

[ 2023-12-04 ]

Protective clothing is a type of clothing used by workers in the workplace to defend against external factors such as physics, chemistry, and biology, with special protective functions. According to the different protection objects and functions, it can be pided into multiple types, including anti-static clothing, flame-retardant clothing, welding protective clothing, arc protective clothing, chemical protective clothing, cold clothing, thermal insulation clothing, radiation protection clothing, warning clothing, antibacterial clothing, bulletproof clothing, stab proof clothing, aerospace clothing, etc., widely used in multiple fields. To ensure the safety and health of the wearer, the special protective performance indicators of protective clothing must meet the protective requirements under specific working conditions. If the protective indicators cannot meet the standard requirements, various hazardous and harmful factors in the working environment may cause damage to the personal safety and health of the wearer or affect the operation. Anti static clothing refers to work clothes sewn with anti static fabric according to the specified style and structure to prevent the accumulation of static electricity on clothing. It is widely used in production processes that are prone to static electricity, such as petroleum, chemical, pharmaceutical, component processing, electrical, power, gunpowder, etc., or in hazardous areas where static discharge can cause device damage, electric shock, fire, and explosion, but is not suitable for anti power supply voltage. The executive standard for anti-static clothing is GB12014-2009 "Anti static Clothing", which is pided into two levels: A and B. Its main functional indicators and applicable places are shown in the table below. The main functional indicators of anti-static clothing include point-to-point resistance and the amount of charged charge. The clothing must undergo 100 washable treatments before testing. The testing environment requires a temperature of (20 ± 5) ℃ and a relative humidity of (35 ± 5)%. Point to point resistance refers to the ratio of a certain DC voltage between the two electrodes on the surface of a fabric sample and the DC current flowing between these two points, applied to an insulated flat plate at a given time. It mainly examines the charge transfer performance of the fabric. The smaller the value, the better the charge transfer performance. However, if the resistance value is less than 1 × 105 Ω, the clothing will become an electrostatic conductor. In this case, after the human body comes into contact with a charged object, there may be a phenomenon of rapid discharge and electric sparks, which is not suitable for electrostatic protection. The amount of charged charge is an indicator of the electrostatic dissipation capacity of clothing itself. During testing, it is necessary to place protective clothing inside the drum and rotate it for a certain period of time to simulate static electricity generated by the friction between clothing and objects during human wearing and working. Then, a dedicated testing instrument is used to test the electrical charge of the clothing. Separate anti-static clothing and acid-base chemical protective clothing should both have "three tight" tops (tight cuffs, tight neckline, and tight hem), and straight bottoms. One piece acid alkali chemical protective clothing should have a tight collar, tight cuffs, and tight pants legs. The bonding parts of the protective clothing for acid and alkali chemicals should be tight, reasonable, and prevent acid and alkali intrusion; The structure of protective clothing should be considered in conjunction with other protective equipment, such as the tight and reasonable connection between the upper sleeve and protective gloves, pants and protective shoes (boots), which can prevent acid and alkali intrusion; Clothing should have no visible pockets or other structures that can accumulate acids or alkalis, but underwear pockets can be included; Accessories should be easy to connect and disconnect, and the material should be corrosion-resistant

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