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wafer butterfly valve

High purity Se powder selenium powder

High purity Se powder selenium powder

High purity Se powder selenium powder

Detailed
selenium metal powder

1. Features of Se powder selenium metal powder

Amorphous red powder, becoming black on standing and crystalline on heating; vitreous and colloidal forms may be prepared. Amorphous form softens at 40 °C and melts at 217 °C. It rarely occurs in its elemental state in nature, or as pure ore compounds. Soluble in concentrated nitric acid and in (liquid form) common alkalies. Forms binary alloys with silver, copper, zinc, lead, etc. Low toxicity. A necessary nutritional factor for animals.

 

Symbol:

Se

CAS

7782-49-2

Atomic Number:

34

Atomic Weight:

78.96

Density:

4.79 gm/cc

Melting Point:

217 oC

Boiling Point:

684.9 oC

Thermal Conductivity:

0.00519 W/cm/K @ 298.2 K

Electrical Resistivity:

106 microhm-cm @ 0 oC

Electronegativity:

2.4 Paulings

Specific Heat:

0.767 Cal/g/K @ 25 oC

Heat of Vaporization:

3.34 K-cal/gm atom at 684.9 oC

Heat of Fusion:

1.22 Cal/gm mole

 

3. Specification of Se selenium metal powder

Se

%

Cu

%

Hg

%

As

%

Sb

%

Te

%

Pb

%

Fe

%

Sn

%

Ni

%

Bi

%

Al

%

Si

%

S

%

99.99 min 0.01max 0.02 0.01 0.03max 0.01max 0.03max 0.09 0.01max 0.01 0.01max 0.01max 0.02 0.03

4. Hazards of Se selenium metal powder

Selenium salts are toxic in large amounts, but trace amounts are necessary for cellular function

5. Applications of Se selenium metal powder

Selenium could be used in different fields, according to its purity. Selenium is now used in a variety of applications, from glass and metallurgical applications to pigments, agriculture and electronics.

 

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