Normy

Obsah

ČSN EN 16465 This European Standard specifies traceable calibration methods of black-standard thermometers (BST), white-standard thermometers (WST), black-panel thermometers (BPT) and white-panel thermometers (WPT) for use in natural and artificial weathering: - method A, a contact method, uses a traceable calibrated resistance standard thermometer; - method B, a contactless method, uses a traceable calibrated pyrometer. A basic design of types of the thermometers is described in EN ISO 4892-1. NOTE 1: Historically method A has been used for weathering applications for many years: Method B has been developed recently. Both methods are qualified for weathering applications. They may provide different calibration results that are not interchangeable. NOTE 2: Annex A gives information on the characteristics of BST/WST and BPT/WPT.

Obsah

ČSN EN ISO 20844 Tato norma popisuje metodu hodnocení odolnosti proti smykovému namáhání u minerálních olejů, syntetických olejů a dalších kapalin obsahujících polymery, které prochází danou vstřikovací tryskou vznětového motoru. Střihová stabilita se měří změnou viskozity zkoušené kapaliny vystavené degradaci polymeru během střihu. Za normálních okolností se tato norma používá pro hydraulické kapaliny skupiny HR a HV, jak jsou definovány v ISO 6743-4 a popsány v ISO 11158, ale může se také používat pro nehořlavé hydraulické kapaliny skupin HFA, HFB, HFC a HFD za podmínek modifikovaných podle popisu v ISO 12922. Mezi poklesem viskozity nebo nepřítomností poklesu viskozity, která se zjistí postupem popsaným v této normě, a poklesem viskozity nebo nepřítomností poklesu viskozity olejů a kapalin ve skutečném provozu nebyla prokázána žádná formální korelace. Přesto zkouška poskytuje standardizované podmínky pro vyhodnocení stability polymeru za minimalizovaného teplotního a oxidačního namáhání. Metoda se běžně používá výrobci kapalin a aditiv a jejich uživateli jako prostředek hodnocení existujících a potenciálních formulací výrobků.

Obsah

ČSN EN 16736 This European Standard specifies the minimum requirements for a course programme to train risk assessors to be competent to assess the health risks posed by chemicals. This European Standard does not comprehensively cover requirements for qualifications for workplace risk assessment according to Directive 98/24/EC. Training of risk assessors consists of both course programs and on-the-job, practical experience. Only the course-based programme is covered in the current standard. This European Standard sets out the requirements, which may be delivered as a complete course programme or as a series of individual courses.

Obsah

ČSN EN ISO 5402-2 This part of ISO 5402 specifies a method for determining the wet or dry flex resistance of leather and finishes applied to leather. It is applicable to all types of leather below 3,0 mm in thickness.

Obsah

ČSN EN ISO 13397-5 This part of ISO 13397 specifies the designs and dimensions for Jacquette scalers.

Obsah

ČSN EN ISO 2746 This International Standard describes two test methods of high voltage testing: - Test A is used to detect and locate defects in vitreous and porcelain enamels; - Test B is used to detect and locate defects and weak spots in vitreous and porcelain enamels. The tests are performed using DC or pulsed DC high voltage. The tests are applicable to dry surfaces of enamel coatings. In the case of moist surfaces, care should be taken to ensure that the locating of any defects is correctly performed. Since test voltages depend on the coating thickness, the test method, especially with test A, may not be suitable for test specimens for which the coating thickness varies to a large extent.

Obsah

ČSN EN ISO 9018 Norma stanoví rozměry zkušebních kusů a zkušebních vzorků a postup pro provádění zkoušek v tahu za účelem stanovení pevnosti v tahu a míst porušení svarových spojů příčně namáhaných koutových svarů. Norma platí pro svařované křížové nebo přeplátované spoje plechů z kovových materiálů. Norma neobsahuje údaje, které se týkají zhodnocení výsledků zkoušky

Obsah

ČSN EN 6031 This European Standard specifies the procedure for the determination of the in-plane shear strength and modulus of fibre composites. The procedure is based on the uni-axial tensile stress-strain response of a ± 45° laminate which is symmetrically laminated about the mid-plane. This standard is applicable to composite laminates manufactured from unidirectional tape or woven fabric reinforcement. This standard does not give any directions necessary to meet the health and safety requirements. It is the responsibility of the user of this standard to consult and establish appropriate health and safety precautions.

Obsah

ČSN EN 6032 This standard specifies a method to determine the apparent glass transition temperatures of non-metallic materials. This standard is applicable to unidirectional tape and woven fabric reinforced plastic or plastic materials like adhesive or neat resin for comparison of the influence on the glass transition temperature resulting from processing-parameters of non-metallic parts, for compatibility tests for checking co-curing effects of different prepreg types or with adhesive. This standard does not give any directions necessary to meet health and safety requirements. It is the responsibility of the user of this standard to consult and establish appropriate health and safety precautions.

Obsah

ČSN EN 6035 This standard defines a method to be used to determine the tensile strength of notched and unnotched fibre reinforced plastics. It is applicable to composite laminates with unidirectional plies or woven fabrics reinforcement. This standard does not give any direction necessary to meet health and safety requirements. It is the responsibility of the user of this standard to consult and establish appropriate health and safety precautions.

Obsah

ČSN EN 6036 This standard defines a method to be used to determine the compression strength of notched, unnotched and filled hole fibre reinforced plastics. It is applicable to composite laminates with unidirectional layers or woven fabric reinforcement. This standard does not give any direction necessary to meet health and safety requirements. It is the responsibility of the user of this standard to consult and establish appropriate health and safety precautions.

Obsah

ČSN EN 6037 This European Standard defines the procedure to be used to determine the bearing strength of fibre composites with multidirectional reinforcement. This standard is applicable to composite laminates manufactured from unidirectional tape or woven fabric reinforcement. This standard does not give any directions necessary to meet health and safety requirements. It is the responsibility of the user of this standard to consult and establish appropriate health and safety precautions.