Normy

Obsah

ČSN EN 15632-2 (38 3376) This document specifies requirements and test methods for flexible, factory made, buried district heating pipe systems with plastic service pipes and bonding between the layers of the pipe assemblies. It is only applicable in conjunction with part 1. This document is applicable to pipes, fittings, their joints and to joints with components made of non-plastics materials intended to be used for district heating installations. This document is applicable to a maximum operating temperature of 95 °C and maximum operating design pressure up to 1,0 MPa for a design service life of at least 30 years. This document does not apply to cover surveillance systems. NOTE - For higher temperatures or for the transport of other fluids, for example potable water, additional requirements and testing is needed. Such requirements are not specified in this document.

Obsah

ČSN EN 14972-10 (38 9260) This document specifies the evaluation of the fire performance of water mist systems for fire protection of interior atriums, with low or medium fire load where the fire load or any obstructions do not extend above 1,5 m height.

Obsah

ČSN EN 17504 This document specifies a method for the determination of free gossypol, extractable by acidified acetonitrile/water, in cottonseed, cottonseed products and compound feeds by liquid chromatography with tandem mass spectrometry (LC-MS/MS). The method described in this document has been successfully validated in the range of 69 mg/kg to 5 950 mg/kg by collaborative trial in the following matrices: cottonseed, cottonseed products (cake/meal, hulls) and compound feeds for bovine, porcine and poultry. NOTE - It is possible to reach quantification limits of approximatively 5 mg/kg in compound feeds. The method might be applicable at lower and at higher concentrations than the concentration range validated in the collaborative trial. However, this needs to be assessed by in-house validation.

Obsah

ČSN EN ISO 489 This document specifies two test methods for determining the refractive index of plastics, namely: - Method A: a refractometric method for measuring the refractive index of moulded parts, cast or extruded sheet or film, by means of a refractometer. It is applicable not only to isotropic transparent, translucent, coloured or opaque materials but also to anisotropic materials. - Method B: an immersion method (making use of the Becke line phenomenon) for determining the refractive index of powdered or granulated transparent materials by means of a microscope. Monochromatic light, in general, is used to avoid dispersion effects. NOTE - The refractive index is a fundamental property which can be used for checking purity and composition, for the identification of materials and for the design of optical parts. The change in refractive index with temperature can give an indication of transition points of materials.

Obsah

ČSN EN ISO 15527 This document specifies the requirements and test methods for solid flat compression-moulded sheets of polyethylene (PE-UHMW and PE-HD, see ISO 1043-1) without fillers or reinforcing materials. It applies only to thicknesses from 10 mm to 200 mm.

Obsah

ČSN EN ISO 15013 This document specifies the requirements and test methods for solid flat extruded sheets of polypropylene homopolymers (PP-H) and polypropylene copolymers (PP-B and PP-R) without fillers or reinforcing materials. This document applies to PP sheet in rolled form. It applies only to thicknesses of 0,5 mm to 40 mm.

Obsah

ČSN EN ISO 16925 This document specifies a test method for the evaluation of the resistance of coatings to pressure water-jetting. The test method simulates the effects pressure water-jetting has on a coating.

Obsah

ČSN EN 17542-1 (72 1024) This document defines the principle and the methods for the determination of the "degradability coefficient" of rocky material. The degradability coefficient IDG distinguishes the behaviour of certain rocky material and is used to show the change in the geotechnical characteristics (particle size, clay content, plasticity, etc.) in relation to the characteristics seen immediately following excavation. Changes in the particle size occur due to the combined action of climatic or geohydrological elements (frost, soaking-drying cycles) and mechanical stress to which it is subjected. In the case of degradable rocky material, this leads to a fairly significant and continuous reduction in the mechanical and geometric characteristics of the works in which they are used. The two methods developed in this document for the determination of IDG are not equivalent. The results obtained by this document refer to the method used.

Obsah

ČSN EN 16908+A1 Všeobecné podmínky a rozsah základních pravidel produktových kategorií (PCR) jsou uvedeny v EN 15084:2012+A2:2019, kapitola 1. Toto PCR je přednostně určeno pro tvorbu EPD "od kolébky po bránu" cementu a stavebního vápna. V ostatních ohledech, rozsah je uveden v EN 15084:2012+A2:2019.

Obsah

ČSN EN ISO 17139 This International Standard describes methods for the determination of linear thermal expansion characteristics of ceramic matrix composite materials up to 2 300 K, and is applicable to 1D, 2D, and nD materials. The method describes general principles of construction, calibration, and operation of the equipment.

Obsah

ČSN EN ISO 18608 This document describes a method for the classification of ceramic matrix composite (CMC) materials with respect to their sensitivity to crack propagation using tensile tests on notched specimens with different notch depths. Two classes of ceramic matrix composite materials can be distinguished: materials whose strength is sensitive to the presence of notches and materials whose strength is not affected. For sensitive materials, this document defines a method for determining equivalent fracture toughness. The parameter, Keq, is defined as the fracture toughness of a homogeneous material which presents the same sensitivity to crack propagation as the ceramic matrix composite material which is being considered. The definition of the Keq parameter offers the possibility to compare ceramic matrix composite materials with other materials with respect to sensitivity to crack propagation. For notch insensitive materials, the concept of Keq does not apply. This document applies to all ceramic matrix composites with a continuous fibre reinforcement, unidirectional (1 D), bidirectional (2 D), and tridirectional (x D, where 2 < x

Obsah

ČSN EN 12873-2 Tento dokument specifikuje postup stanovení migrace látek z materiálů nekovových a neobsahujících cement aplikovaných na místě, používaných ve styku s vodou určenou k lidské spotřebě. Platí pro materiály aplikované na místě, sloužící k transportu a akumulaci vody určené k lidské spotřebě, i surové vody používané k výrobě vody určené k lidské spotřebě, za různých podmínek. Zahrnuje i vyluhování látek z těchto materiálů do vody po provedené aplikaci. Tento dokument platí i pro materiály, jejichž fyzikální nebo chemické vlastnosti se mění během aplikace na místě nebo po ní, např. povlaky, nátěry a lepidla. Platí také pro některé místně aplikované materiály, které nemění své vlastnosti, např. pro tuky a mazadla. .