Is useful the SBI test to evaluate the reaction to fire?

With this translation of the original post written in spanish «¿Es adecuado el ensayo del SBI?», I gonna present you a new section on the Fire safety blog called «English corner». In this section you will find a posts selection made by me in English. So, I hope you enjoy it !!!.

This post has its origin in the erroneous comments and statements that for many years I have listened about the suitability of the SBI test (EN 13823) as a test to evaluate the reaction to fire. It should take into account that this test represents an advance with respect to the old Spanish legislation, due to SBI test allows us to know new parameters that were previously not considered.

At present, Euroclasses are required by our legislation to fulfill the requirements associated with the reaction to fire. The most representative test and one that gives us more information is called SBI (Single Burning Item, EN 13823). This test consists of simulating a burning object in the corner of a room in order to evaluate the fire behavior of the room’s cladding product. The SBI test is based on the so-called large-scale reference test ISO 9705 «Room corner test». Between the two tests, the differences are very remarkable and affect, among other aspects, the dimensions of specimens, dimensions of the test room, heat output from the burner, test procedure, etc.

This reference test was used to define the boundaries of the Euroclass based on the possible occurrence of flashover. The correlation between the two tests was carried out through the evaluation of 30 construction products analyzing the FIGRA (Fire Growth Rate). FIGRA is the rate of heat release of a product or material. The correlation showed very good results because of the 30 evaluated products, for 26 of them the result was satisfactory. However, there were 4 products that the correlation through FIGRA was not desired. These 4 groups of products were EPS sandwich panels, polycarbonate panels, PVC profiles and electric cables. To this product group was called the «exotic products».

In this respect, it should be noted that the correlation was not as desired due to the ISO 9705 test is intended to know the contribution to fire of a surface product. Obviously, exotic products are not designed to use as surface product . For this reason, this reference test is not suitable for this type of products.

However, it should be noted that 90% of the construction products considered in this correlation exercise got a good estimation of their behaviour through the SBI test. Therefore, the validity of this test to evaluate the products of construction in case of fire should be recognized, since it also allows to test the products according to their end use application including for example both horizontal and / or vertical joints, substrates as well as different fixing and assembly techniques. This is a great step with respect to old classification standard (UNE 23727), which did not provide the necessary versatility in the evaluation of the behaviour in case of fire.

 

 

Diseño de Instalaciones de Protección contra Incendios (PCI)

Sobre Antonio Galán 47 Artículos
Antonio es Licenciado en Química (Univ. Alcalá de Henares), dispone del Postgrado de Perito de Seguros, Incendios y Riesgos Diversos (Univ. Barcelona e INESE) y del Curso Europeo Superior de Seguridad contra Incendios (CFPA-Europe y Cepreven). Además y como complemento a la formación anterior, ha realizado el Curso de Inspección y Evaluación de Multirriesgos en Industrias y el Seminario Modular de las normas NFPA 13, 20 y 25. (Cepreven). En la actualidad, Antonio desarrolla su actividad profesional prestando servicios de consultoría en materia de seguridad contra incendios, especializado en Reacción al Fuego. A nivel nacional, ostenta el cargo de Presidente del subcomité de normalización de los ensayos de Reacción al Fuego de materiales (CTN-23-SC6), es vocal del subcomité de normalización de Ingeniería de Seguridad contra Incendios (CTN-23-SC8), es miembro de la Comisión Técnica del Código Técnico de la Edificación (CTE DB SI-Seguridad en caso de incendio) y colabora habitualmente con la Asociación para la Prevención y Protección de Riesgos (Cepreven) en cursos y jornadas técnicas sobre protección pasiva. A nivel europeo, asiste como delegado español a las reuniones internacionales del CEN/TC 127 "Fire Safety in Buildings" y como experto nacional en los grupos de trabajo europeos incluidos en este comité europeo (WG4 “Reaction to Fire”, WG5 “Roofs” y WG7 “Classification”). En el pasado, su actividad profesional se desarrolló durante 9 años en el laboratorio de ensayos de reacción al fuego de AFITI-LICOF siendo destacable la posición de Director Técnico de Laboratorio y la de profesor del Master en Ingeniería de Protección contra Incendios de la Universidad de Comillas y de la Asociación de Profesionales de Ingeniería de Protección contra Incendios (APICI). Además, tras finalizar su Postgrado de Perito de Seguros, Incendios y Riesgos Diversos, colaboró con un gabinete pericial.