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Standards GB are Chinese national standards, which are issued by China's Standardization Administration Office (SAC).
Chinese national standards are used all over China commonly labeled as GB standards. They determine the united production requirements regarding product safety and quality .
GB standards are often modified or created according to the international standards of ISO, IEC or any other international level.
Although, they are largely harmonized, GB standards may differ from international standards .
Approximately 15% of all GB standards are obligatory and they can be identified according to the prefix GB, after which the code of the standards follows:
GB – Obligatory national standards
GB/T – Optional national standards
GB/Z – National steering technical document
Natural gas—Determination of sulfur compound—Part 2: Determination of hydrogen sulfide content by methylene blue method
Standard published on 23.5.2023
Selected format:Natural gasDetermination of sulfur compoundPart 3:Determination of hydrogen sulfide content by lead acetate reaction rate dual photo path method
Standard published on 17.9.2018
Selected format:Natural gas—Determination of sulfur compound—Part 4: Determination of total sulfur content by oxidative microcoulometry method
Standard published on 29.12.2017
Selected format:Natural gas - Determination of sulfur compound - Part 5: Determination of total sulfur content by hydrogenolysis and rateometric colorimetry method
Standard published on 9.8.2010
Selected format:Natural gas—Determination of sulfur compounds—Part 8Determination of total sulfur content by ultraviolet fluorescence method
Standard published on 29.9.2020
Selected format:Natrual gas - Determination of sulfur compounds - Part 9: Determination of mercaptan sulfur content by iodometric titration method
Standard published on 5.12.2011
Selected format:Natural gas—Calculation of calorific values, density, relative density and Wobbe indices from composition
Standard published on 29.9.2020
Selected format:Polyamide plate based flat belt
Standard published on 5.12.2014
Selected format:Methods for chemical analysis of lithium carbonate, lithium hydroxide monohydrate and lithium chloride—Part 1: Determination of lithium carbonate content—Titration
Standard published on 29.9.2024
Selected format:Methods for chemical analysis of lithium carbonate,lithium hydroxide monohydrate and lithium chloride - Part 10: Determination of chloride content - Silver chloride nephelometry method
Standard published on 27.11.2013
Selected format:Latest update: 2025-08-26 (Number of items: 2 213 294)
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