BS EN ISO 374-4:2019 pdf free
BS EN ISO 374-4:2019 pdf free.Protective gloves against dangerous chemicals and micro-organisms Part 4: Determination of resistance to degradation by chemicals.
This document specifies the test method for the determination of the resistance of protective glove materials to degradation by dangerous chemicals with continuous contact.
NOTE Annex A gives information on interlaboratory test results on this method.
It is preferable that other tests used in addition to the evaluation of chemical resistance such as permeation resistance and penetration, as the chemical test do not provide sufficient information on the physical property changes affecting a glove during exposure to a chemical. It is necessary that the outside surface of the glove be exposed to the chemical.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3744, Protective gloves against dangerous chemicals and micro-organisms — Part 1: Terminology and performance requirements for chemical risks
ISO 21420, Protective gloves — General requirements and test methods ISO 23388:2018, Protective gloves against mechanical risks
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 374-1 and ISO 21420 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http://www.iso.org/obp
— IEC Electropedia: available at http://www.c1ectropedi.orgjf
4 Test principles
The resistance of a protective glove material to degradation by a liquid chemical is determined by measuring the change in puncture resistance of the glove material after continuous contact of the external surface with the challenge test chemical. The test is applicable to gloves made of natural or synthetic polymer. Lined gloves can produce unusable measurement results.
This document specifies the test method for the determination of the resistance of protective glove materials to degradation by dangerous chemicals with continuous contact.
NOTE Annex A gives information on interlaboratory test results on this method.
It is preferable that other tests used in addition to the evaluation of chemical resistance such as permeation resistance and penetration, as the chemical test do not provide sufficient information on the physical property changes affecting a glove during exposure to a chemical. It is necessary that the outside surface of the glove be exposed to the chemical.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3744, Protective gloves against dangerous chemicals and micro-organisms — Part 1: Terminology and performance requirements for chemical risks
ISO 21420, Protective gloves — General requirements and test methods ISO 23388:2018, Protective gloves against mechanical risks
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 374-1 and ISO 21420 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http://www.iso.org/obp
— IEC Electropedia: available at http://www.c1ectropedi.orgjf
4 Test principles
The resistance of a protective glove material to degradation by a liquid chemical is determined by measuring the change in puncture resistance of the glove material after continuous contact of the external surface with the challenge test chemical. The test is applicable to gloves made of natural or synthetic polymer. Lined gloves can produce unusable measurement results.
5 Test methods, puncture resistance test
5.1 Sampling
Select three gloves for testing. Condition the gloves at (23 ± 2) °C, (50 ± 5) % relative humidity for at least 24 h.
In the case of irregular and/or multiple construction, one sample shall be tested from each area. Using the appropriate circular die of 20 mm, cut 6 specimens of each glove for a total of 18 test specimens. For each glove, 3 specimens will be exposed to the challenge chemical and 3 specimens will be unexposed.
Select specimens so that they are homogeneous and representative of the glove’s primary construction. Avoid embossed patterned areas or other areas of varying thickness or composition when cutting these specimens.
If a glove is constituted of several unbounded layers, only the layer giving the chemical protection shall be tested.
The sample shall be tested according to the method described in &3. An additional non-mandatory informative test method is given as an example in Annex B.
For lined gloves, if it is not possible to separate the liner from the glove (and if the liner is too thick), the test could not be feasible, because it would not be possible to seal the vial and the sample would slide during the test. For some samples, if there is a thick liner, it could not be necessary to use the septa to have a correct vial sealing. In this case, the liner will ensure the leakproofness.
5.2 Apparatus
The following equipment shall be used:
a) (20 ± 1) mm diameter cutting die;
b) (12 ± 1) mm diameter cutting die (for cutting a hole En the centre of each septum);
c) 20 ml crimp top vials (opening (12,5 ± 0,5) mm of diameter);
d) 20 mm diameter septa (e.g. made from chlorobutyl rubber without polytetrafluoroethylene (PTFE) layer);
e) 20 mm open centre aluminium crimp seals; hand crimper.BS EN ISO 374-4 pdf free download.
