IEC PAS 62958:2015 pdf download

IEC PAS 62958:2015 pdf download.Clothes washing machines for household use – Method for measuring the microbial contamination reduction
1 Scope
This Publicly Available Specification (PAS) specifies a test method for measuring the reduction of microbial contamination in clothes washing machines and of the possible cross contamination to uncontaminated load. NOTE A significant differentiation in microorganism contamination reduction capability of washing machines can be expected at wash temperature not higher than 40 °C. This PAS applies to clothes washing machines for household use, with or without heating devices utilising cold and/or hot water supply. It also covers washing machines which specify the use of no detergent for normal use. This PAS applies also to washing machines for communal use in blocks of flats or in launderettes. This PAS does not deal with professional washing machines nor with commercial laundry operations associated with food service, hospital linens or other non-residential applications. It also does not address the needs of persons with specific health conditions requiring special sanitization and/or disinfection techniques. This PAS does not specify safety requirements and does not deal with performance of washing machines measured under IEC 60456 nor with effects on fabrics.
3 Terms, definitions and symbols
3.1 Terms and definitions 3.1.1 washing machine appliance for cleaning and rinsing of textiles using water which may also have a means of extracting excess water from the textiles 3.1.2 test washing machine washing machine that is subjected to part or all of the requirements in this PAS in order to determine its performance 3.1.3 test run single performance assessment 3.1.4 programme series of operations which are pre-defined within the washing machine and which are declared by the manufacturer as suitable for washing certain textile types 3.1 .5 base load textile load used for testing not including the bio monitors 3.1 .6 cross contamination transfer of microorganisms from fabrics to fabrics during one test run 3.1 .7 inoculum quantity of cells to be inoculated in culture medium 3.1.8 bio monitor microorganism carrier inoculated with microorganisms to be used to monitor the reduction of microbial contamination 3.1.9 temperature profile time–temperature data representing the water temperature in the washing machine during the test run
5 Test conditions, materials, equipment and instrumentation
5.1 Test conditions For all requirements regarding ambient conditions (electricity supply, water supply, ambient temperature and humidity) and base load, see IEC 60456:201 0. Additionally, the water supplied to the test washing machine shall not contain more than 1 00 cfu/ml. Microorganisms for test purposes as listed in 5.2.1 shall not be present in the water. The micribiological quality of the water supplied to the test washing machine is determined according to 5.2.3.2 and 6.5.3 5.2 Materials and reagents 5.2.1 Microorganisms for test purposes For test purposes the following microorganisms, the first two bacteria strains and the last one a yeast strain, shall be used: • Pseudomonas putida (ATCC 1 1 1 72 / DSM 6521 ) • Staphylococcus aureus (ATCC 6538 / DSM 799) • Candida albicans (ATCC 1 0231 / DSM 1 386) NOTE Additional microorganisms may be used. For internal development purpose and pre-evaluation of microorganism contamination reduction in clothes washing machines, a protocol with risk class 1 test microorganisms may be performed as described in Annex A. 5.2.2 Culture media and solutions 5.2.2.1 Culture media All media and solutions shall be of microbiology grade and sterilized appropriately prior to use. It is recommended to use commercially available and/or water-free dry materials for the culture media. The specifications in the following clauses refer to water-free products. 5.2.2.1 .1 Tryptone Soy Agar (TSA) The composition of Tryptone Soy Agar (TSA) shall be according to Table 1 .5.2.3 Detergent 5.2.3.1 General The detergent shall be IEC A* base powder according to IEC 60456. 5.2.3.2 Pre test for water quantity A pre test to determine the water quantity, which is the calculation base for the detergent dosage, is necessary. The following conditions shall apply: a) Run 3 times the programme which is foreseen to be tested. b) Use the same load size as in the test with bio monitors. c) Use in all 3 tests dry base load (according to IEC 60456). d) The detergent dose is 2 g per kg of base load.