Kr
Noble Gas  ·  CAS 7439-90-9  ·  Atomic No. 36

Molecular Weight — 83.80

Kr

Krypton

Mol. Weight

83.80

Purity

99.999%

Specific Vol.

4.61 ft³/lb

UN Number

UN1056

UN NumberUN1056
Hazard ClassClass 2.2
Subsidiary RiskNone
Hazard LabelNon-Flammable Gas
AppearanceColorless, Odorless Gas
CAS Number7439-90-9
Molecular Weight83.80 g/mol
Boiling Point−153.4 °C (−244.1 °F)
Specific Volume4.61 ft³/lb
PhaseCompressed Gas

Krypton

Krypton is an inert noble gas present in Earth's atmosphere at approximately 1.1 parts per million. First isolated in 1898 by Sir William Ramsay and Morris Travers through fractional distillation of liquid air, its name derives from the Greek word for "hidden." Its remarkable chemical stability makes it indispensable in applications requiring precise environmental control.

In the lighting industry, krypton-filled incandescent lamps operate at higher filament temperatures than argon-filled counterparts, delivering superior luminous efficacy and longer operational lifetimes. High-intensity discharge (HID) krypton arc lamps are standard in high-speed photography, stroboscopic measurement instruments, and cinema projection systems.

In semiconductor manufacturing, high-purity krypton serves as a carrier and shield gas in plasma etch processes, where its mass and ionization characteristics enable controlled material removal at the sub-nanometer scale. Airocean Gases supplies Grade 5.0 krypton (99.999% min. purity) to meet the rigorous demands of semiconductor fabrication, laser development, and precision scientific research.

Product Specifications

Grade

Grade 5.0

Purity

99.999% min.

Application Type

Research (RES)

Product Code Prefix

SG KRRES-

Cylinder & Packaging Options

Type

T High-Pressure Cylinder

Water Capacity

~49 L

Fill Pressure

150 bar (2,175 psi)

Valve Outlet

CGA 677

Net Gas Weight

~1.8 kg (~4.0 lb)

SKU Suffix

-T

Type

K High-Pressure Cylinder

Water Capacity

~49 L

Fill Pressure

204 bar (2,960 psi)

Valve Outlet

CGA 677

Net Gas Weight

~2.4 kg (~5.3 lb)

SKU Suffix

-K

Type

Q High-Pressure Cylinder

Water Capacity

~49 L

Fill Pressure

300 bar (4,350 psi)

Valve Outlet

CGA 677

Net Gas Weight

~3.5 kg (~7.7 lb)

SKU Suffix

-Q

Type

Size 55 Cylinder

Water Capacity

~10 L

Fill Pressure

150 bar (2,175 psi)

Valve Outlet

CGA 677

Net Gas Weight

~0.35 kg (~0.77 lb)

SKU Suffix

-55

Type

R Cylinder

Water Capacity

~16 L

Fill Pressure

150 bar (2,175 psi)

Valve Outlet

CGA 677

Net Gas Weight

~0.55 kg (~1.2 lb)

SKU Suffix

-R

* Specifications are nominal. Actual fill weights may vary. Contact our technical sales team for bulk supply, custom cylinder configurations, or on-site delivery programs.

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