Normy

Obsah

ČSN EN 6101 This document specifies the dimensions, tolerances and mass of rivets with 100° medium flush head, close tolerance, inch series, for aerospace application.

Obsah

ČSN EN 4703 This document specifies a test that determines the ability of electrical equipment to withstand wet atmospheres in combination with variable ambient air pressure in particular in an aircraft installation. The main adverse effects to be anticipated are fluid ingress and related insulation breakdown.

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ČSN EN 15634-3 This document specifies a method for the detection of hazelnut (Corylus avellana) in chocolate. Real-time PCR (Polymerase chain reaction) detection of hazelnut is based on a 152 bp (base pair) sequence from the corA 1 gene of hazelnut.

Obsah

ČSN EN 15634-4 This document specifies a method for the detection of peanut (Arachis hypogaea) in chocolate. Real-time PCR (Polymerase Chain Reaction) detection of peanut is based on an 86 bp (base pair) sequence from the Ara h 2 gene of peanut.

Obsah

ČSN EN 15634-5 This document specifies a procedure for the qualitative detection of species specific DNA from white mustard (Sinapis alba) and soya (Glycine max) in cooked sausages using singleplex real-time PCR based on the genes MADS-D (mustard) and lectin (soya).

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ČSN ISO 21033 Tato mezinárodní norma specifikuje metodu optické emisní spektrometrie s indukčně vázaným plazmatem (ICP OES) pro stanovení obsahu stopových prvků v olejích. V závislosti na použitém ředicím rozpouštědle lze analyzovat většinu typů rostlinných olejů (surový, degumovaný, rafinovaný, bělený, deodorizovaný a ztužený) a téměř všechny typy lecitinů a fosfatidů. Mléko a mléčné výrobky (nebo tuk pocházející z mléka a mléčných výrobků) jsou vyloučeny z předmětu této mezinárodní normy. Tato metoda je vhodná pouze pokud jsou prvky přítomny v rozpustné formě. Jemné částice jako bělidlo, částice kovů a rez mohou způsobovat nízkou výtěžnost přítomných stopových prvků, protože problémy se zmlžováním (nebulizací) a atomizací ovlivňují ICP-OES analýzu. Stará verze (A1): This Technical Specification specifies an inductively coupled plasma optical emission spectroscopic (ICPOES) method for the determination of trace element content in oils. Depending on the dilution solvent used, most types of vegetable oils can be analysed (crude, degummed, refined, bleached, deodorized and hardened oils) and nearly all types of lecithins and phosphatides. This procedure is only suitable when the elements are present in a solubilized form. Fine particles, such as bleaching earth, metal particles and rust, can result in poor recovery of the trace elements present as nebulization and atomization problems affect the ICP-OES analysis. NOTE - The only suitable non-ashing direct method for samples containing fine particles is graphite furnace atomic absorption spectrometry. Tato technická specifikace specifikuje metodu optické emisní spektrometrie s indukčně vázaným plazmatem (ICP-OES) pro stanovení obsahu stopových prvků v olejích. Touto metodou je možné, v závislosti na použitém ředicím rozpouštědle, analyzovat většinu typů rostlinných olejů (surový, degumovaný, rafinovaný, bělený, deodorizovaný a ztužený) a téměř všechny typy lecitinů a fosfatidů. Tento postup je vhodný pouze pokud jsou prvky přítomny v rozpustné formě. Jemné částice jako bělidlo, částice kovů a rez mohou způsobovat nízkou výtěžnost přítomných stopových prvků, neboť problémy s nebulizací a atomizací ovlivňují ICP-OES analýzu.

Obsah

ČSN EN ISO 13266 This document specifies a method of testing the resistance of the upper assembly of inspection chambers and manhole components against surface and traffic loading. It is not applicable to requirements for testing the cover and frame. Those requirements are specified in EN 124-1 or other standards, depending on the material. NOTE - Upper assembly components normally include shafts or risers, cones, telescopic adapters and near surface components.

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ČSN EN ISO 13268 This document specifies a test method for assessing the initial (short-term) tangential ring stiffness of riser shafts for thermoplastics inspection chambers or manholes.

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ČSN EN 301 This document establishes a classification for phenolic and aminoplastic polycondensation adhesives according to their suitability for use for load-bearing timber products in defined climatic exposure conditions, and specifies performance requirements for such adhesives for the factory manufacture or factory-like manufacturing conditions of load-bearing timber products only. This document only specifies the performance of an adhesive for use in an environment corresponding to the defined conditions. The performance requirements of this document are applicable to the adhesive only, not to the manufacturing timber products. This document does not cover the performance of adhesives for on-site gluing (except for factory-like conditions) or the production of wood-based panels, except solid wood panels, or modified and stabilized wood with considerably reduced swelling and shrinkage properties, e.g. acetylated wood, heat treated wood and polymer impregnated wood. This document is primarily intended for use by adhesive manufacturers and for use in timber products bonded with adhesives, to assess or control the quality of adhesives. The requirements are applicable to the type testing of the adhesives. Production control activities are outside the scope of this document. Adhesives meeting the requirements of this document are adequate for use in load-bearing timber products, provided that the bonding process has been carried out according to an appropriate product standard.

Obsah

ČSN EN 302-6 This document specifies a method of determining the minimum pressing time for two glue line thicknesses, close contact glue line and thick glue line (between 0,3 mm and 8 mm), at three temperatures. It is applicable to adhesives used in load-bearing timber products. This document is only intended for obtaining a reliable base of comparison of pressing time between adhesives. The method gives results that cannot be applied to the safe manufacture of timber structures without modifications for the influences of timber density/absorbency, moisture content, factory temperature and relative air humidity.

Obsah

ČSN EN 302-5 This document specifies a laboratory method of determining the maximum assembly time at two spread rate levels in standard atmosphere [20/65]. This document is applicable to obtaining a reliable base of comparison of the maximum assembly time between adhesives at referenced conditions.

Obsah

ČSN EN 302-4 This document specifies a method for determining the influence of shear strength in crosswise gluing by wood shrinkage under drying conditions. It is applicable for the following applications: a) for assessing the compliance of adhesives with EN 301, EN 15425, EN 16254, EN 17334 and EN 17418; b) for assessing the suitability and quality of adhesives for load-bearing timber structures; c) for determining if the adhesive is capable of withstanding stresses due to wood shrinkage without unacceptable loss of strength. This test is intended primarily to obtain performance data for the classification of adhesives for load-bearing timber structures according to their suitability for use in defined climatic environments. This test is carried out on Norway spruce (Picea abies L.). This method is not intended to provide data for structural design and does not necessarily represent the performance of the bonded member in service.