Normy

Obsah

ČSN EN ISO 12958-1 This document specifies a method for determining the constant-head water flow capacity within the plane of a geotextile or geotextile-related product. This document describes the in-plane water flow index test, only applicable to factory-assembled products. For the in-plane water flow performance test, see ISO 12958-2.

Obsah

ČSN EN ISO 11063 The present document specifies a method for direct extraction of DNA from soil samples to analyse the abundance and composition of microbial communities by various techniques of molecular biology including real-time quantitative PCR (qPCR). This method is mainly dedicated to agricultural and forest soils. This method can possibly not be suitable for soils rich in organic matter (e.g. peat soils) or soils heavily polluted with organic pollutants or heavy metals. The direct extraction of DNA from soil samples provides unique insight into the alpha- and beta-diversity of microbial communities. Next-generation sequencing of amplicons obtained by PCR (polymerase chain reaction) amplification of soil DNA constitutes a promising domain which will in the near future contribute to the development of routine tools to monitor microbial communities in soil environments.

Obsah

EN ISO/ASTM 52941 This document specifies requirements and test methods for the qualification and re-qualification of laser beam machines for metal powder bed fusion additive manufacturing for aerospace applications. It can also be used to verify machine features during periodic inspections or following maintenance and repair activities.

Obsah

ČSN P CEN ISO/TS 80004-3 This document defines terms related to carbon nano-objects in the field of nanotechnologies. It is intended to facilitate communication between organizations' and individuals' research, industry and other interested parties and those who interact with them. Additional terms and definitions for graphene and two-dimensional materials (2D) materials are provided in ISO/TS 80004-13. Related carbon nanoscale materials are given in Annex A.

Obsah

ČSN EN 13953 This document specifies the design, testing and marking requirements for spring loaded pressure relief valves (PRV), for use in liquefied petroleum gas (LPG) cylinders of water capacity of 0,5 l up to and including 150 l. These PRVs can be either an integral part of a cylinder valve (see EN ISO 14245 [4] and EN ISO 15995 [5]) or a separate device.

Obsah

ČSN EN 2133 This document specifies the electrolytic cadmium plating of parts and fasteners in steel of tensile strength UTS

Obsah

ČSN EN IEC 61058-2-4 ed. 2 Tato norma platí pro samostatně montované spínače pro spotřebiče (mechanické nebo elektronické) ovládané rukou, nohou nebo jinou lidskou činností, pro ovládání nebo řízení elektrických spotřebičů a jiných zařízení pro domovní nebo podobné použití, se jmenovitým napětím do 480 V a jmenovitým proudem do 63 A.

Obsah

ČSN EN IEC 60675-2 This document applies to electric direct-acting room heaters. This document defines performance characteristics related to the radiant effect and specifies methods for measuring the radiant factor for the information of users. This document is used to measure the radiant factor of direct-acting room heaters.

Obsah

ČSN EN ISO 15156-1 This document describes general principles and gives requirements and recommendations for the selection and qualification of metallic materials for service in equipment used in oil and gas production and in natural-gas sweetening plants in H2S-containing environments, where the failure of such equipment can pose a risk to the health and safety of the public and personnel or to the environment. It can be applied to help to avoid costly corrosion damage to the equipment itself. It supplements, but does not replace, the materials requirements given in the appropriate design codes, standards, or regulations. This document addresses all mechanisms of cracking that can be caused by H2S, including sulfide stress cracking, stress corrosion cracking, hydrogen-induced cracking and stepwise cracking, stress-oriented hydrogen-induced cracking, soft zone cracking, and galvanically induced hydrogen stress cracking. Table 1 provides a non-exhaustive list of equipment to which this document is applicable, including exclusions. This document applies to the qualification and selection of materials for equipment designed and constructed using load controlled design methods. For design utilizing strain-based design methods, see Clause 5. This document is not necessarily applicable to equipment used in refining or downstream processes and equipment.

Obsah

ČSN P CEN/TS 16010 This document specifies a system for sampling procedures for testing plastics waste and recyclates which take into account the specifics of the plastics waste and recyclates. It is intended to cover all stages of the plastic recycling process. The sampling procedures include the statistical specifics of the plastic waste and the behaviour of recyclates. The sampling method is expected to produce a representative testing sample. Differences can arise due to: - the mixture of plastics; - the origin (e.g. green dot in Germany, or electronic/automotive industry); - the previous use of the plastic material; - the residual contents (e.g. of containers); - inert, residual or moisture content on or in the material. This document is without prejudice to any existing legislation.

Obsah

ČSN EN ISO 23168 This document specifies a method for the determination of the water content of water-borne coating materials and their raw materials by using a gas chromatograph. The preferred working range of this test method is from a water mass fraction of 15 % to a water mass fraction of 90 % but the method can be applied outside of this range.

Obsah

ČSN EN ISO 22518 This document specifies a method for the gas-chromatographic determination of the solvents in water-thinnable paints and varnishes, binder solutions, emulsions and dispersions. With the precision stated in Clause 13, single components above 0,02 % (mass fraction) can be determined quantitatively. The method defined in this document is not applicable for the determination of Volatile Organic Compounds (VOC) and Semi-Volatile Organic Compounds (SVOC) content. NOTE - For the determination of VOC and SVOC, see ISO 11890-2