Low voltage surge protective devices — Part 21: Surge protective devices connected to telecommunicat...
1.1 Scope
This International Standard is applicable to devices for surge protection of telecommunications
and signalling networks against indirect and direct effects of lightning or other transient
overvoltages.
The purpose of these SPDs is to protect modern electronic equipment connected to
telecommunications and signalling networks with nominal system voltages up to 1 000 V
(r.m.s.) a.c…
Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U) piping syst...
This document specifies the characteristics of valves made from unplasticized polyamide (PA-U) in accordance with ISOÂ 16486-1, intended to be buried and used for the supply of gaseous fuels.
It is applicable to isolating unidirectional and bi-directional valves with spigot ends or electrofusion sockets intended to be fused with PA-U pipes or fittings conforming to ISO 16486-2 and ISO 16486-3…
Lignin — Quantification of hydroxyl groups by 31P NMR This document is provided to SCC for non-comme...
1 Scope
1.1 General
This Standard describes a method for the quantification of the aliphatic (R–OH), carboxylic acid (R–COOH), and phenolic (Ph–OH) hydroxyl groups present in lignin. Phenolic hydroxyl groups include
a)
syringyl (S), guaiacyl (G), and p-hydroxyphenyl (H) units; and
b)
condensed phenolics incorporating ß-5, 4-O-5’, and 5-5’ inter-unit linkages.
1.2 Methodology
The procedure…
Traditional Chinese medicine — General requirements for manufacturing procedures and quality assuran...
This document specifies general requirements for manufacturing procedures and quality and safety assurance of granules and compactates made from traditional Chinese medicine extracts or powder for oral use. This document excludes granules or compactates made from pure compounds (chemically defined) even if they are isolated as naturally occurring constituents of decoction pieces or crude herbal…