Category: EN standards

Where a product is specified by thickness, it shall be measured in accordance with EN 1849-1 and the results shall lie within the declared tolerance of the manufacturer’s declared value. Where sheets with incorporated mineral protection are specified by thickness, the measurement of thickness may additionally be carried out on the granule-free selvedge. This shall be declared in the report. […]

4 Principle Cubic test specimens (two equal groups consisting of main test specimens and reference test specimens) are cut from products sampled from normal production, saturated in water for (48 ± 1) h, removed and then placed in polythene bags or similar protecting against drying for (24 ± 1) h to equilibrate. The main test specimens are subjected to repeated […]

7.1.2 Test portion solution Transfer the test portion (7.1.1) into a 250 ml polytetrafluorethylene, polyethylene or polypropylene beaker (5.1). Add 40 ml of the fluoroboric-nitric acid mixture (4.5). Cover with a watch glass and heat gently until the test portion is completely dissolved, then heat at a temperature of approximately 90 °C until brown fumes have been expelled. If polyethylene […]

1 Scope This European Standard applies to fire dampers that are to be used in conjunction with fire separating elements to maintain fire compartments. This standard specifies requirements and gives reference to the test methods defined for fire dampers, which are intended to be installed in Heating, Ventilating and Air Conditioning (HVAC) installations in buildings. All fire dampers close automatically […]

he manual forces, which are needed to actuate the closing and locking devices, shall be of a magnitude that can be applied by an operator without additional tools. Exceptions are allowable when additional tools are specifically made available or when motor driven systems are used. The requirements of EN 349 apply. Guidance concerning the determination of the maximum permissible manual […]

4 Recommendations relating to measuring methods 4.1 Measurement of air temperature Measurements should only be taken to answer questions which will help to solve environmental or conservation problems and they should always form part of an overall plan for environmental improvement. Air temperature is monitored to establish a cause-and-effect relationship between atmospheric variables and the response of cultural heritage objects. […]

1 Scope This European Standard applies to technical ductwork products, intended for installation in ductwork conforming to EN 1505 and EN 1506, used in air conditioning and ventilation systems defined in the scope of CEN/TC 156. This document specifies the leakage requirements for technical ductwork products, i.e. components in the ductwork that has more functions than conveying air, such as […]

1 Scope This European Standard specifies a method for the determination of ochratoxin A in currants, raisins, sultanas, mixed dried fruit and dried figs by high performance liquid chromatography (HPLC) with immunoaffinity cleanup and fluorescence detection. This method has been validated in an interlaboratory study via the analysis of both naturally contaminated and spiked samples ranging from 1,1 µg/kg to […]

1 Scope This European Standard specifies a method for the determination of ochratoxin A in cereal based foods for infants and young children by high performance liquid chromatography (HPLC) with immunoaffinity column cleanup and fluorescence detection. This method has been validated in an interlaboratory study via the analysis of both naturally contaminated and spiked samples ranging from 0,050 µg/kg to […]

4.2 Reference method A reference method for the determination of allergenic food commodities should be independent of any technological influences and matrix effects, in order to reliably measure one or more property values characteristic of the allergen concerned. The reference method’s accuracy and precision should be commensurate with its intended use and permit the characterization of a reference material. Reference […]