Application and performance requirements of protective materials
From the standard point of view, we should look at the performance of protective clothing materials from three aspects: first, physical strength, depending on whether the protective clothing materials are strong; Second, chemical or biological barrier is also very important, because protective clothing needs to protect the body and skin, barrier performance is an important indicator; Third, comfort requirements.
European Union standards judge the fabric index of protective clothing: first, wear resistance and bending resistance, because many actions when wearing protective clothing will make the fabric fold. The European Union divides various performance indicators into different levels. For example, wear resistance is divided into one level to six levels, that is to say, the level of protective clothing can be known through wear resistance tests. Generally, the wear resistance of the first grade is relatively low and the wear resistance of the sixth grade is relatively strong. The second is tear strength, tensile strength, puncture resistance and antistatic requirements. The anti-static requirements mainly consider the risk of static electricity in inflammable and explosive environment.
In addition to physical barrier, more important is chemical barrier. In the European standard, Type I to type VI have different requirements on the protective power of chemicals, among which Type I to type IV have higher requirements on protective clothing. Type VI only prevents slight splash. As protective clothing, penetration is more important than permeability.
The comfort of protective clothing fabric is also very important. On the basis of satisfying the protection, the lighter the better. Moreover, the lower the breathability value, the better the breathability of the fabric. Non-woven fabric and multi-layer composite film material protective clothing, which is also the mainstream protective clothing material in the current market. This kind of protective clothing material can be divided into two types according to its protective mechanism: breathable and impermeable (isolated). Although breathable non-woven fabrics are made into protective clothing, which can block particulate matter and aerosol, the protection provided by some virus breathable protective clothing is very limited.
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