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Chemical analysis of refractories containing alumina, zirconia and silica. Refractories containing 5 percent to 45 percent of ZrO2 (alternative to the X-ray fluorescence method). Apparatus, reagents and dissolution. Original standard UNE-EN ISO 21079-1-2008 in PDF full version. Additional info + preview on request

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Health informatics. Directory services for healthcare providers, subjects of care and other entities. Original standard UNE-EN ISO 21091-2013 in PDF full version. Additional info + preview on request

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Cosmetics. Microbiology. Enumeration and detection of aerobic mesophilic bacteria. Original standard UNE-EN ISO 21149-2017 in PDF full version. Additional info + preview on request

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Light conveyor belts. Determination of electrical resistances. Original standard UNE-EN ISO 21178-2020 in PDF full version. Additional info + preview on request

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Paints and varnishes - Evaluation of defects on coated surfaces using optical imaging - Part 1- General guidance. Original standard UNE-EN ISO 21227-1-2004 in PDF full version. Additional info + preview on request

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Paints and varnishes - Evaluation of defects on coated surfaces using optical imaging - Part 2- Evaluation procedure for multi-impact stone-chipping test. Original standard UNE-EN ISO 21227-2-2007 in PDF full version. Additional info + preview on request

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