BS/EN 14325-2018 pdf download.Protective clothing against chemicals – Test methods and performance classification of chemical protective clothing materials, seams, joins and assemblages.
A number of performance classification levels are identified for the various properties of materials to he found in this standard.
The value of each property defined in 4.4 to 4.15 and which shall be used for performance classification, shall be determined in accordance with Annex C including the calculation of uncertainty of measurement for all the results.
If not specified otherwise within 4.4, 4.5, 4.6, 4.7, 4.9 or within the specific test method itself, a material with different behaviour in the length and cross directions, shall be tested for its performance in both directions. The performance classification shall be based on the results obtained for the direction resulting in the lower perhwmance classification when evaluated according to Annex C.
For a material with different surface characteristics, the fabric side that will appear on the outside of the apparel shall be tested for all test methods that are linked to surface performance (i.e. 4.4, 4.5, 4.6, 4.8. 4.11, 4.12.4.13,4.14,4.15,) and the performance classification shall be based on the results for this side.
If the chemical protective clothing consists of multiple layers of materials, with or without separable layers, all layers shall be tested together with the chemical protective clothing outer surface being tested for those properties which are linked to surface performance.
For materials, which require pre-treatment, the performance classification shall be based on the lowest performance classification obtained on either testing new (not pre-treated) and/or pre-treated materials based on evidence. The performance classification tests shall be performed on the worst case. If Insufficient evidence is available to determine whether the test shall be performed as new or pretreated, the test shall be performed in both conditions.
4.2 Pre-treatnient
4.2.1 Pre-treatment by cleaning and disinfection
Before each test, all chemical protective clothing material samples, with the exception of limited-use chemical protective clothing, shall undergo pre-treatment by cleaning and disinfection as applicable.
If the manufacturer’s instructions indicate that cleaning or disinfection is not allowed, i.e. limited use garments, then testing shall be carried out on new material.
Where applicable according to manufacturer’s instruction, the cleaning and disinfection shall be in line with the manufacturer’s instructions, on the basis of standardized procedures, If the number of cleaning and disinfection cycles is not specified, the tests shall be carried out after S cycles of pre-treatment, each consisting of one wash cycle, one dry cycle and one disinfection cycle carried out in the sequence as indicated by the manufacturer’s instructions. This shall be reflected in the information supplied by the manufacturer. lithe garment can be washed or alternatively dry-cleaned it shall only be washed, dried and disinfected. If only dry-cleaning is allowed, the garment shall only be dry-cleaned and disinfected in accordance with the manufacturer’s instructions.
Specimens, which have been pre-treated according to 4.2.1, may also be pre-treated by one of the numbers of flexing cycles given in Table 2 in accordance with the method described in 4.5.1 and as specified In the product standard or as defined by the manufacturer, whichever Is the larger, prior to testing according to 4.11.
4.3 ConditIoning
Unless otherwise indicated in the product standard, all specimens shall be conditioned by storage at (20 ± 2) °C and (65 ± 5) % relative humidity in accordance with EN ISO 139 for at least 24 h. If applicable, the tests shall be started within S mm of removing the specimen from the conditioning atmosphere, unless otherwise indicated in the test method standard.
Conditioning may be omitted or aligned with the conditions of 4.3 if it can be shown that test results are not affected by the foreseeable changes of temperature and relative humidity.
4.4 AbrasIon resistance
4.4.1 General
A set of four test specimens of a material sample, where each specimen shall consist of all layers, shall be tested in accordance with EN ISO 12947-2 in the inverted mode, i.e. a test specimen of at least 140 mm diameter placed on the abradant table and an abradant of at least 30 mm diameter mounted in the test piece holder, using abrasive paper specified in Annex B and with an applied downward pressure of 9 kPa. The abrasion resistance of the chemical protective clothing material shall be classified according to the levels of performance given m Table 1, using the highest number of abrasion rubs, determined according to 4.4.2, which do not cause damage to the material.
4.4.2 DetermInation of the highest number of abrasion rubs which does not cause damage to the material and which shall be used for the performance classification
4.4.2.1 General
To determine the level of performance, the leak tightness of each of the four test specimens of a material sample shall be determined after a number of abrasion rubs. An additional sample will be used to determine the leak tightness prior abrasion.
There are three methods of leak tightness assessment, the pressure pot, the hydrostatic head and visual inspection. The pressure pot shall be used if possible, but if not possible, the hydrostatic head test is preferred. Alternatively, visual inspection shall be performed, if neither pressure pot nor hydrostatic head test is performed. In this latter case, this shall be reported in the test report and also in the Instructions for Use indicating that the visual inspection is qualitative and does not provide evidence of liquid tightness after abrasion. If the assessment is performed through visual inspection, the maximum classification that can be claimed is a Class 3.BS/EN 14325-2018 pdf download.
BS/EN 14325-2018 pdf download
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