Estudio comparativo de la estimación de la incertidumbre de medición en ensayos físico-mecánicos de espuma de poliuretano para la acreditación del laboratorio de calidad lamitex s.a. bajo norma iso/iec 17025:2017

Abstract

The purpose of this academic essay is to specifically comply with requirements 7.6.1 and 7.6.3 of the standard NTE INEN ISO 17025:2017 “General requirements for the competence of testing and calibration laboratories” as a contribution to the Accreditation of the Lamitex S.A. Quality Laboratory of the city of Cuenca, through the Ecuadorian Acreditation Service (SAE). The objective is to estimate and compare the measurement uncertainty of the test results listed in the Ecuadorian technical standard NTE INEN-ISO 5999:2013 “Flexible cellular polymeric materials – polyurethane foam for applications under load excluding carpet reinforcements – requirements”, through the implementation of the GUM methodology “Guide to the Expression of Uncertainties in Measurement” or also called ISO/IEC Guide 98-3. Three types of polyurethane foam were selected as the study population: high, medium and low density, which represent a global and comprehensive evaluation. The test methods comply with technical requirements and standardized methodologies, i.e., each property was measured according to the corresponding standard. The measurement uncertainty estimation process starts with the definition of the measurand, which relates the input magnitudes that characterize the property under study. Finally, the maximum uncertainty limits are defined supported by the decision rule based on simple acceptance, and all tests are validated guaranteeing compliance with the requirements established in the corresponding standard and verifying that uncertainty plays an important role in the conformity assessment.