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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
Analysis of water used in boiler and cooling system--Determination of silica--Photometric method by silica-molybdenum blue
WITHDRAWN published on 29.12.1989
Selected format:Analysis of water used in boiler and cooling system—Determination of turbidity--Formazine turbidity
WITHDRAWN published on 29.12.1989
Selected format:Analysis of water used in boiler and cooling system--Determination of mineral oil--Infrared photometric method
WITHDRAWN published on 29.12.1989
Selected format:Analysis of water used in boiler and cooling system--Determination of mineral oil--Ultraviolet spectrophotometry
WITHDRAWN published on 29.12.1989
Selected format:Analysis of water used in boiler and cooling system--Determination of total aluminium
WITHDRAWN published on 29.12.1989
Selected format:Analysis of water used in boiler and cooling system--Determination for sodium--Dynamic method
WITHDRAWN published on 29.12.1989
Selected format:Analysis of water used in boiler and cooling system--Determination for sodium--Static method
WITHDRAWN published on 29.12.1989
Selected format:Analysis of water used in boiler and cooling system--Determination for dissolved oxygen--Internalelectrolysis
WITHDRAWN published on 29.12.1989
Selected format:Water for industrial circulating cooling system and boiler—Determination of dissolved oxygen
WITHDRAWN published on 13.8.2007
Selected format:General quideline for preventing electrostatic accidents
WITHDRAWN published on 5.1.1990
Selected format:Latest update: 2025-11-09 (Number of items: 2 243 571)
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