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EN 17658:2022 Evaluation of chemical textile disinfectants for domestic area
EN 17658 outlines the procedure to evaluate the microbicidal effectiveness of a chemical product designed for washing processes within domestic settings. The test method is evaluated using a domestic washing equipment at lower temperatures (up to 40 °C).
EN 17658 serves as a phase 2, step 2 test method mimicking the practical conditions to evaluate the efficacy of chemical disinfectants under controlled laboratory conditions.
EN 17658 Test Conditions & Requirement
Minimum test conditions and parameters specified by EN 17658 are as follows –
Test parameters | Domestic laundry disinfection | Biocidal treatment to avoid malodour and aesthetic damage caused by microorganisms | ||
Main wash | Rinse cycle | Main wash | Rinse cycle | |
Test organisms | Escherichia coli (ATCC 8739), Enterococcus hirae (ATCC 10541), Pseudomonas aeruginosa (ATCC 15442), Staphylococcus aureus (ATCC 6538P), Candida Albicans (MTCC 3017) | |||
Additionally | Additional test organism(s) – Dermatophytes | Additional test organism(s) – Dermatophytes Organisms associated with malodour | ||
Test temperature | As recommended by the manufacturer and ≤ 40 °C | As recommended by the manufacturer and ≤ 20 °C | As recommended by the manufacturer and ≤ 40 °C | As recommended by the manufacturer and ≤ 20 °C |
Contact time | As recommended by the manufacturer | As recommended by the manufacturer | As recommended by the manufacturer | As recommended by the manufacturer |
Soiling | Dirty: 3,5 g textile SBL2004 (100g ballast fabric) | Clean: BSA in embedding matrix | Dirty: 3,5 g textile SBL2004 (100g ballast fabric) | Clean: BSA in embedding matrix |
Liquor ratio | Between 1:2 and 1:10 as specified by the manufacturer | Between 1:2 and 1:10 as specified by the manufacturer | Between 1:2 and 1:10 as specified by the manufacturer | Between 1:2 and 1:10 as specified by the manufacturer |
EN 17658 Test Method
- Cotton fabric (textile carriers) are contaminated with bacterial test suspension in BSA (bovine serum albumin). Inoculated fabric is allowed to dry out.
- Dried inoculated textile carriers are subjected to domestic disinfection process in a tumbling lab testing device containing textile ballast load.
- Upon the completion of the disinfection process, textile carriers are transferred into a neutralizer solution to stop further activity. Neutralizer solution is shaken at a rate of 1 000 rpm to extract the remaining trapped microorganisms from the carriers.
- Neutralizing extract with the recovered bacteria is plated to determine the reduction in microorganisms from treated samples in comparison to an untreated control.
Importance of EN 17658 Test
Washing garments at temperature ≤ 40 °C has been observed to result in incomplete microbial decontamination after the washing processes. However, certain clothes require washing at lower temperatures and with gentle cycles to maintain the integrity of their design. Laundry chemical disinfectants have been developed to ensure complete hygiene while restoring the overall appearance of clothes under specified conditions.
The EN 17658 standard assists in evaluating the microbicidal efficacy of chemical disinfectants used in laundry processes that operate at temperatures lower than 40°C.
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FAQs
EN 17658 test is a Phase 2, Step 2 test for laundry chemical disinfectants intended for use in domestic settings. EN 17658 standard helps evaluate the microbicidal efficacy of chemical disinfectants used in laundry processes that operate at ≤ 40 °C.
The EN 17658 test is designed for assessing the effectiveness of laundry chemical disinfectants that are meant to be used in domestic settings.
EN 17658 test takes 3-4 weeks to complete.
At Microbe Investigations, we test for EN 17658 using the following microbial strains: Escherichia coli (ATCC 8739), Enterococcus hirae (ATCC 10541), Pseudomonas aeruginosa (ATCC 15442), Staphylococcus aureus (ATCC 6538P), Candida Albicans (MTCC 3017)
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