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Electronegative gas, sulfur hexafluoride (SF6)

  • Basic info:

  • English name

    Sulfur hexafluoride

  • CAS

    2551-62-4

  • Hazard info

    1080

  • Transport

    Subclass 2.2

    ADR Class 2A

  • Properties:

  • Molar mass

    146.0554

  • Gas density at 15°С/1,013 bar

    6.261

  • Boiling point at 1,013 bar

    -63.9

Options

Filling
  • single-piece

5 l10 l40 l — 150 bar

Connection
  • Cylinders 2 l, 5 l, 10 l (DIN 6 (W21.6x1/14'')) DIN 6 (W21.6x1/14'')
  • Cylinder(s) 5 l, 10 l, 40 l, 50 l and monoblocks ( DIN 9 (G 3/4)) DIN 9 (G 3/4)
Recommended reducer

Specs

Electronegative gas 4.0 Electronegative gas 4.7 Electronegative gas 5.0
Composition
SF6 % ≥99.99% ≥99.997% ≥99.999%
Admixture
Air ppmv <500
H2O ppmv <5 <2 <1
O2 + N2 % - <5 <5
CF4 ppmv <500 <15 <5
HF % <0,0 <0,5 <0,1
Description
Attributes
Suits for
Transport
Papers

Electronegative gas, sulfur hexafluoride (sulfur hexafluoride, SF6, sulfur fluoride (VI)), is a heavy gas (5 times heavier than air), color- and odor-free. The gas is stable under normal conditions. Not reactive.

It does not react with hydrogen, oxygen, alkalis and acids. It is supplied mostly in cylinders. It is a non-toxic and non-flammable chemical compound that is five to six times heavier than air. It was called electronegative gas because of its key characteristics, i.e. higher electrical insulating and arc extinguishing abilities. Its degree of inertia is slightly less than that of helium, and its sparking voltage level is elevated.

  • retains properties during long-term storage in cylinders
  • quickly recombines under electrical discharge
  • has high electrical strength
  • reduces heating of current-carrying parts due to good cooling properties of sulfur hexafluoride
  • chemically inactive and non-aggressive to metals at temperatures up to +500⁰C

In energy, it is used as an insulator and coolant in high-voltage sulfur hexafluoride circuit breakers, at substations and power transmission lines with sulfur hexafluoride insulation. In the chemical industry: in plasma-chemical etching processes of silicon, for filling glass units for heat and sound insulation, as a source of fluorine, as a cushion in open baths with molten metals due to its inertness and very high density, as a carrier gas in laboratories in supercritical chromatography (SFC). Petrochemistry: in supercritical fluid extraction (SFE).

In medicine, as a contrast agent in ultrasound studies. In retinal surgery.

As an indicator in leak detection. To check the efficiency of ventilation systems.

иконка Suits for Oil and Gas Oil and Gas
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иконка Suits for Metallurgy Metallurgy

Sulfur hexafluoride is very fluid, seeping through the shells of metal containers and sealing joints. Therefore, special cylinders are needed for its storage and transportation.

Transportation of cylinders must be carried out in a horizontal position with spacers between the cylinders or in a vertical position with mandatory protection against possible falls. Transportation in packaged form in special containers is allowed.

Joint transportation with oxygen cylinders is not allowed.

Pure nitrogen is dangerous when transporting

Can be transported by

  • train
  • truck
  • ship

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