Welding protective clothing flame retardant standard

The first part: the basic requirements
        Detection methods and criteria:
        judgement standard:
        a) There shall be no burning on any test specimen after it has ignited to the fabric edge or to the upper end of the fabric.
        b) There shall be no hole formation in any test sample after ignition.
        c) In any test sample, there should be no burning droplets or melting melt.
        d) Delay time must be less than or equal to 2 seconds.
        e) Smoldering time must be less than or equal to 2 seconds.
       ※ The negative impact of the metal drop falling: According to the requirements of the test, the clothing assembly must have at least 15 drops of metal droplets fall.
        Detection method:
        Sample preparation
        Test samples to test the fabric as the main body, the number of its requirements and the size of the relevant testing methods must be consistent. If there are no special provisions, according to the test samples received as a benchmark for testing.
        Textile fabric pre-treatment process
        According to instructions on the label requirements of the test samples were washed or dry cleaning, and then for special safety requirements of the provisions of the textile fabrics and apparel assembly performance testing.
        Add 1 g / L IEC detergent to softener water sample five times before loading horizontal drum washer, and finally dry it according to the method specified in ISO: 6330: 1984.
        In the label without any other special provisions, washing method 2A operation, temperature control at (60 ± 3) ℃, and then use the method E of the sample drying (tumble drying).
         The test sample is thoroughly washed and labeled with an ISO 3175 requirement to perform only 5 dry cleanings. Such as fabric or clothing without identification label, then five times washing and five times dry cleaning, the fabric to be tested separately.
        Temperature and humidity status adjustment
         Unless otherwise specified in the test method, the textile test piece shall be left in the environment of temperature (20 ± 2) ℃ and relative humidity (65 ± 5)% for at least 24 hours and the leather article for at least 7 days under the same conditions and then Separate testing. In this environment relative humidity and temperature adjustment immediately after the test sample removed from the environment and within 5 minutes for testing.
        Breaking strength
        Fabric fabric breaking strength according to the requirements of ISO5081 in the fabric lateral and latitudinal for evaluation. (Minimum breaking strength should be 300 Newtons)
        Tear strength
        In the test sample transverse and latitudinal out for testing, according to ISO4674: 1977 version of the A1 method to assess the tear strength of textile fabrics, at the plane of the fabric at right angles were tested in both directions and according to ISO3374 Requires evaluation of the tear strength of leather products. (Minimum tear strength should be 15 Newtons)
         Shrinkage judgment (size change)
        According to dry-cleaning method or washing method for testing, and according to the provisions of ISO5077 judge the shrinkage of textile fabric size. (Shrinkage of not more than 3%)
        Assessment of flame spread
        According to the provisions of the method of testing samples after washing or dry cleaning, follow the method of EN532 to detect fabric burn spread performance.
        Metal drop caused by the fall of fabric properties
        After the test samples were washed or dry-cleaned, the effect of falling metal droplets was evaluated in accordance with EN348.
        If the average drop of ten drops on the test sample drops between 15 and 15.5 drops, then the second test of 10 cloth samples, judging from the class should be based on the average of 20 pieces of cloth test data shall prevail.

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