JB/T 7778.4-2008
Test methods for chemical analysis of silver-tungsten carbide electric contact material.Part 4:Determination of free carbon content (English Version)

Standard No.

JB/T 7778.4-2008

Language

Chinese, Available in English version

Release Date

2008

Published By

Professional Standard - Machinery

Latest

JB/T 7778.4-2008

Replace

JB/T 7778.4-1995

Scope

This part of JB/T 7778 specifies the method for determining the amount of free carbon in silver tungsten carbide electrical contact materials. This section applies to the determination of free carbon content in silver tungsten carbide electrical contact materials. Measuring range: 2.00%-5.00%.

JB/T 7778.4-2008 Referenced Document

• GB/T 223.69 Iron,steel and alloy.Determination of carbon contents.Gas-volumetric method after combustion in the pipe furnace*， 2008-05-13 Update
• JB/T 7778.3-2008 Test methods for chemical analysis of silver-tungsten carbide electric contact material.Part 3:Determination of overall carbon content

JB/T 7778.4-2008 history

• 2008 JB/T 7778.4-2008 Test methods for chemical analysis of silver-tungsten carbide electric contact material.Part 4:Determination of free carbon content
• 1995 JB/T 7778.4-1995 Method for chemical analysis of silver tungsten carbide electrical contact materials Acid separation-gas volumetric method for determination of free carbon content