Normy

Obsah

ČSN EN ISO 22764 This document specifies the precious metal content in solders suitable for use in the production of jewellery made of precious metal alloys.

Obsah

ČSN EN ISO 24018 This document specifies the requirements, test methods, inspection, marking, packaging, transportation, storage, quality certificate and the order (or contract) information of one kilogram gold bars. This document is applicable to one-kilogram cast gold bars produced for investment markets or industrial (jewellery, electronic) markets.

Obsah

ČSN EN ISO 23345 This document describes a non-destructive method to verify (confirm) the precious metal fineness of finished and semifinished jewellery item(s) considered homogeneous by ED-XRF (energy dispersive X-ray fluorescence), including alloys according to ISO 9202. This document is not suitable for any coated items. WD-XRF (wavelength dispersive X-ray fluorescence) equipment cannot be used.

Obsah

ČSN EN ISO 8653 This International Standard specifies a method to measure the ring-size using a ring stick with defined characteristics, which is mainly used during manufacturing steps, and specifies the designation of the ring-size. NOTE - For jeweller-consumer relationships, the finger size is measured with a finger gauge set made up of a ring for each size with the same diameter and tolerance than the ring stick ones.

Obsah

ČSN ISO 10716 Tento dokument specifikuje metodu pro stanovení alkalické rezervy papírů a lepenek. Je určen pro výrobky, které obsahují alkalické pigmenty nebo jiný alkalický materiál přidaný za účelem zvýšení jejich odolnosti vůči působení kyselin (degradace). Tento dokument se nevztahuje na laminované, potištěné nebo jinak zpracované druhy, které se popsaným postupem zcela nerozloží. Získaný výsledek bude zahrnovat alkalické pigmenty obsažené v nátěru natíraného papíru. POZNÁMKA - Takový alkalický nátěr ochrání jádro papíru před kyselými látkami v okolním vzduchu, ale jeho účinek na kyselé látky vznikající v samotném základním papíru je nejistý.

Obsah

ČSN EN 16659 This document specifies a test method for the determination of per cent recovery and non-recoverable creep compliance of bitumens and bituminous binders by means of a Multiple Stress Creep and Recovery (MSCR) test. The MSCR test is conducted using the Dynamic Shear Rheometer (DSR) in creep mode at a specified temperature. The per cent recovery at multiple shear stress levels is intended to determine the presence of elastic response and the stress dependence of bituminous binders. The non-recoverable creep compliance at multiple shear stress levels is intended as an indicator for the sensitivity to permanent deformation and stress dependence of bituminous binders. This document is applicable to un-aged, aged, stabilized and recovered bituminous binders. The test procedure in accordance with this document is not applicable for bituminous binders with particles larger than 250 µm (e.g. filler material, granulated rubber).