EN 1058:2009

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Holzwerkstoffe - Bestimmung der charakteristischen 5%-Quantilwerte und der charakteristischen MittelwertePanneaux à base de bois - Détermination des valeurs caractéristiques correspondant au fractile à 5 pour cent d'exclusion inférieure et des valeurs caractéristiques moyennesWood-based panels - Determination of characteristic 5-percentile values and characteristic mean values79.060.01Wood-based panels in generalICS:Ta slovenski standard je istoveten z:EN 1058:2009SIST EN 1058:2010en,fr,de01-april-2010SIST EN 1058:2010SLOVENSKI
STANDARDSIST EN 1058:19961DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1058
November 2009 ICS 79.060.01 Supersedes EN 1058:1995English Version
Wood-based panels - Determination of characteristic 5-percentile values and characteristic mean values
Panneaux à base de bois - Détermination des valeurs caractéristiques correspondant au fractile à 5 % d'exclusion et des valeurs caractéristiques moyennes
Holzwerkstoffe - Bestimmung der charakteristischen 5-%-Quantil Werte und charakteristischen Mittelwerte This European Standard was approved by CEN on 3 October 2009.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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Calculation of the 5-percentile characteristic value of log-normal distributed test data according to EN 14358 .7A.1 Symbols .7A.1.1 Letter symbols .7A.1.2 Indices .7A.2 Analysis of data .8A.2.1 Characteristic value km of test data with unknown coefficient of variation .8A.2.2 Characteristic value km of test data with known coefficient of variation .8A.3 Acceptance criteria for a sample .9A.4 Examples of calculation .9A.4.1 Determination of the characteristic value of the modulus of bending 05f of particle boards with unknown coefficient of variation: .9A.4.2 Determination of the characteristic value of the modulus of bending 05f of particle boards with known coefficient of variation: . 11Annex B (normative)
Calculation of the characteristic mean value (50-percentile value) of normal distributed test data. 13B.1 Symbols . 13B.1.1 Letter symbols (see appendix A) . 13B.1.2 Indices (see also appendix A) . 13B.2 Analysis of data . 13B.2.1 50-percentile characteristic values (characteristic mean values) . 13B.3 Acceptance criteria for a sample . 14B.4 Examples of calculation . 14B.4.1 Determination of the lower 50-percentile characteristic value (lower characteristic mean value) of the modulus of elasticity %50EL parallel to the production line of OSB of a normal distributed sample with unknown coefficient of variation. . 14B.4.2 Determination of the upper 50-percentile characteristic value (upper characteristic mean value) of the density 50ρU of a normal distributed sample of particle boards with known coefficient of variation ρν. . 16Bibliography . 17 SIST EN 1058:2010

1 Scope On the basis of test results from wood-based panel products for structural purposes, this European Standard specifies a method for the determination of:  characteristic 5-percentile values of mechanical properties under the assumption of a log-normal distribution of the test data according to EN 14358; and  characteristic mean values (50-percentile values) of physical properties under the assumption of a normal distribution of the test data. Test data should be determined from tests using the test methods outlined in EN 789. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 326-1, Wood-based panels
Sampling, cutting and inspection
Part 1: Sampling and cutting of test pieces and expression of test results EN 789, Timber structures
Test methods
Determination of mechanical properties of wood based panels EN 14358, Timber structures
Calculation of characteristic 5-percentile values and acceptance criteria for a sample 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 characteristic value value of a material property which is defined as a fractile of the distribution of that property within the total population of that material NOTE For all strength properties, this fractile is the fifth percentile. For stiffness properties as well as physical properties, two different characteristic values can be used: the fifth percentile and the mean value. 3.2 panel piece of wood-based sheet material large enough to permit the cutting of test pieces 3.3 reference population wood-based panels for which the characteristic values are relevant 3.4 production site any single production line SIST EN 1058:2010

3.7 test piece piece of panel cut to the size required for testing a specific property 4 Symbols L Lower specification limit 05x Characteristic value of a log-normal distributed property 50x Characteristic mean value of a normal distributed property U Upper specification limit xlnν Coefficient of variation of a log-normal distributed sample xν Coefficient of variation of a normal distributed sample
5 Reference population The reference population is in accordance with EN 326-1 defined by parameters such as type and manufacturing process, thickness range, grade, lay-up and quality classification of wood-based panels and is consistent with the material that is or can be supplied commercially and is capable of being identified at all stages of production, supply and in service. 6 Determination of characteristic values of mechanical and physical properties 6.1 Sampling A total of at least 32 panels of the same type, grade, thickness range and/or lay-up shall be sampled at random from the production sites. Where there are fewer than 32 shifts, the total number of panels shall be obtained by taking a maximum of four panels from each shift at each production site. Sampling of test pieces from panels shall be in accordance with the procedures given in EN 789. SIST EN 1058:2010
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