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Raw Material Impurity Specification

Buffalo Tungsten uses the best quality raw materials to assure that our tungsten powders meet the highest standards.  The following are chemical impurity standards for our APT, BTO and YTO, as well as the required sieve analysis.

MAXIMUM IMPURITY CONTENT (%)

Al

0.0010

Mo

0.0020

As

0.0010

Na

0.0010

Bi

0.0010

Ni

0.0007

C

0.0010

P

0.0007

Ca

0.0005

Pb

0.0002

Co

0.0005

S

0.0007

Cr

0.0010

Sb

0.0005

Cu

0.0005

Si

0.0010

Fe

0.0010

Sn

0.0003

K

0.0005

Ti

0.0010

Mn

0.0007

V

0.0010

Mg

0.0007

Zn

0.0010

 

 

OTHERS

0.0010

SIEVE ANALYSIS

+60 mesh

0%

+200 mesh

10-50%

+100 mesh

0-30%

+325 mesh

10-30%

+140 mesh

10-50%

-325 mesh

0-20%

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