Standards GB - Chinese national standards - Page 483

Methods for chemical analysis of tantalum and niobium—Part 6:Determination of silicon content—Inductively coupled plasma atomic emission spectrometry

Standard published on 6.3.2020

Methods for chemical analysis of tantalum and niobium—Part 7:Determination of phospherus content in niobium—4-Formyloxy-pentyl ketone-[2] extraction separation phosphomolybdate blue spectrophotometry and inductively coupled plasma atomic emission spectrometry

Standard published on 6.3.2020

Methods for chemical analysis of tantalum and niobium - Determination of carbon and sulphur contents

Standard published on 31.3.2008

Methods for chemical analysis of tantalum and niobium - Determination of iron, chromium, nickel, manganese, titanium, aluminum, copper, tin, lead and zirconium contents in tantalum

Standard published on 31.3.2008

Geometric size measuring methods of precious metals and their alloy materials

Standard published on 31.3.2008

Testing method for contact resistance of precious metals electrical contact materials

Standard published on 20.8.2021

Manganese ores--Determination of total iron content--Potassium dichromate titrimetric method and 110-phenanthroline spectrophotometric method

Standard published on 11.9.2002

The specification for industrial healthand safety technology in glass factory

Standard published on 24.5.1994

Technical specifications of occupational health for glass industries
Execute Date: february 2027

Standard published on 2.7.2026

Speed meters for motor vehicle

Standard published on 16.4.2008