{"id":8982,"date":"2025-05-01T19:55:58","date_gmt":"2025-05-01T16:55:58","guid":{"rendered":"https:\/\/hdlab.gr\/cosmetics-dermocosmetics\/challenge-test-%ce%b1%ce%be%ce%b9%ce%bf%ce%bb%ce%bf%ce%b3%ce%b7%cf%83%ce%b7-%ce%b1%cf%80%ce%bf%cf%84%ce%b5%ce%bb%ce%b5%cf%83%ce%bc%ce%b1%cf%84%ce%b9%ce%ba%ce%bf%cf%84%ce%b7%cf%84%ce%b1%cf%83-%cf%83\/"},"modified":"2026-03-23T10:19:43","modified_gmt":"2026-03-23T08:19:43","slug":"preservative-efficacy-testing","status":"publish","type":"page","link":"https:\/\/hdlab.gr\/en\/cosmetics-dermocosmetics\/preservative-efficacy-testing\/","title":{"rendered":"Preservative Efficacy Testing (Challenge Test \u2013 ISO 11930)"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column][vc_empty_space][\/vc_column][\/vc_row][vc_section full_width=&#8221;stretch_row&#8221; css=&#8221;.vc_custom_1532167956213{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 20px !important;padding-bottom: 66px !important;}&#8221; el_class=&#8221;background-position-top-custom&#8221;][vc_row gap=&#8221;35&#8243;][vc_column width=&#8221;5\/12&#8243; 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From concept to compliant market launch.&#8221; font_container=&#8221;tag:p|font_size:15px|text_align:left|color:%23434343|line_height:26px&#8221; use_theme_fonts=&#8221;yes&#8221; css_animation=&#8221;none&#8221; css=&#8221;.vc_custom_1774253967244{margin-top: 0px !important;margin-bottom: 18px !important;padding-top: 0px !important;padding-bottom: 0px !important;}&#8221;]\r<!-- radiantthemes-custom-button -->\r<div class=\"radiantthemes-custom-button hover-style-one rt723353101  letter-spacing-0 font-weight-medium\"  data-button-direction=\"left\" data-button-fullwidth=\"false\" ><a style=\" color: #ffffff; line-height: 26px; font-size: 14px;\" class=\"radiantthemes-custom-button-main  vc_custom_1774253979654\" href=\"https:\/\/hdlab.gr\/contact\/\"  title=\"\u0395\u03c0\u03b9\u03ba\u03bf\u03b9\u03bd\u03c9\u03bd\u03af\u03b1\" target=\"_self\"><div class=\"placeholder\">Contact us<\/div><\/a><\/div>\r<!-- radiantthemes-custom-button -->\r[\/vc_column_inner][\/vc_row_inner][\/vc_column][vc_column width=&#8221;7\/12&#8243; css=&#8221;.vc_custom_1532164210873{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-right: 0px !important;padding-bottom: 0px !important;padding-left: 0px !important;}&#8221; offset=&#8221;vc_col-lg-8 vc_col-md-8 vc_col-xs-12&#8243;][vc_custom_heading text=&#8221;Preservative Efficacy Testing (Challenge Test \u2013 ISO 11930)&#8221; font_container=&#8221;tag:h2|font_size:30px|text_align:left|color:%232d2d2d|line_height:40px&#8221; use_theme_fonts=&#8221;yes&#8221; css_animation=&#8221;none&#8221; css=&#8221;.vc_custom_1773753062407{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}&#8221;][vc_empty_space height=&#8221;15px&#8221;][vc_separator][vc_column_text css=&#8221;&#8221; el_class=&#8221;hdlabtext&#8221;]Preservative efficacy evaluation is a <strong>regulatory requirement<\/strong> under <strong>Regulation (EC) No 1223\/2009<\/strong>.<\/p>\n<p>At HD LAB, the <strong>Challenge Test<\/strong> is performed according to <strong>ISO 11930:2019 \u2013 Evaluation of the antimicrobial protection of a cosmetic product<\/strong>.<\/p>\n<p><strong>Test Methodology<\/strong><\/p>\n<p>The product is artificially inoculated with reference microbial strains:<\/p>\n<ul>\n<li><em>Staphylococcus aureus<\/em> (ATCC 6538)<\/li>\n<li><em>Pseudomonas aeruginosa<\/em> (ATCC 9027)<\/li>\n<li><em>Escherichia coli<\/em> (ATCC 8739)<\/li>\n<li><em>Candida albicans<\/em> (ATCC 10231)<\/li>\n<li><em>Aspergillus brasiliensis<\/em> (ATCC 16404)<\/li>\n<\/ul>\n<p>Microbial reduction is assessed at <strong>0, 7, 14 and 28 days<\/strong>, according to <strong>Acceptance Criteria A and B<\/strong>, evaluating both preservative performance and overall microbiological robustness.[\/vc_column_text][\/vc_column][\/vc_row][\/vc_section]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_empty_space][\/vc_column][\/vc_row][vc_section full_width=&#8221;stretch_row&#8221; css=&#8221;.vc_custom_1532167956213{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 20px !important;padding-bottom: 66px !important;}&#8221; el_class=&#8221;background-position-top-custom&#8221;][vc_row gap=&#8221;35&#8243;][vc_column width=&#8221;5\/12&#8243; css=&#8221;.vc_custom_1531893806780{padding-left: 20px !important;}&#8221; offset=&#8221;vc_col-lg-4 vc_col-md-4 vc_col-xs-12&#8243;][vc_row_inner css=&#8221;.vc_custom_1532164808767{margin-top: 0px !important;margin-bottom: 0px !important;border-top-width: 1px !important;border-right-width: 1px !important;border-bottom-width: 1px !important;border-left-width: 1px !important;padding-top: 0px !important;padding-right: 0px !important;padding-bottom: 0px !important;padding-left: 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