Krypton Gas: What It’s Used For and Why It Costs So Much

Krypton is a noble gas pulled out of cryogenic air separation in very small volumes, present in air at about 1.1 ppm. Most of it ends up in lighting, insulating glass units, lasers, gas-insulated switchgear and superconducting magnet cooling. It costs several times what argon costs because there is almost none of it to recover. The same column that fills argon cylinders by the tonne gives you krypton by the litre.

Where krypton actually goes

Lighting is the old, steady outlet. A krypton fill slows tungsten evaporation off the filament, so the lamp runs hotter and lasts longer than an argon-filled tube of the same wattage.

Insulating glass is the outlet that surprises buyers. Krypton is heavy and a poor heat conductor, so it holds a window’s U-value better than air does, and it keeps that advantage in narrow cavities where argon starts to struggle. Thin triple glazing and slim frames are where it earns its price. The catch is cost per cubic metre of fill, which is why most IG units still run argon.

Lasers take a smaller, fussier share. Krypton-fluoride excimer sources and krypton-ion tubes both want clean gas, and the impurity limits matter more there than the purity headline does.

Gas-insulated switchgear uses krypton in insulating mixtures, and superconducting magnet systems draw it into cryogenic cooling circuits. Both are project-driven: demand arrives in blocks, not on a smooth curve.

Why the price moves

Krypton is not made, only separated, as a side stream of a plant whose business is oxygen and nitrogen. At 1.1 ppm by volume, you process roughly a million cubic metres of air to collect one cubic metre. That ratio sets the cost floor.

So output follows the air-separation plants, not the krypton market. When a steel mill cuts its oxygen offtake and the cold box throttles back, krypton supply falls with it.

Four research houses publish krypton numbers, and none of them agree.

The first two differ by a factor of six. Both are published, both are paid for, and neither is a price list.

The gap is scope, not arithmetic. Some houses count only merchant krypton that moves in cylinders; others fold in captive volume that never reaches a market. Future Market Insights frames it a third way, as a 44% share of product mix. Both can be true at once.

Anyone quoting a market figure without a scope line is guessing.

What the spec sheet really says

Krypton (CAS 7439-90-9, UN1950) ships between 99.99% and 99.9999%. The rows below are what buyers test against.

Oxygen and argon share one row, O2+Ar ≤1.5 ppm, because splitting them at that level costs more than most applications justify. For lamps and lasers, that combined figure decides whether a lot passes.

CF4 ≤1.0 ppm is the row electronics buyers read first, since fluorocarbons ride through the cold box with the rare gases and do not come out in a simple purge. Water is the quiet one: H2O ≤2.0 ppm looks generous until the gas sits in a sealed cavity or behind laser optics for a year.

Read the water and CF4 rows first.

Cylinders and fittings

Two packages, 40 L and 50 L. The 40 L holds 6 m³ of gas, the 50 L holds 10 m³, and tare weight runs 50 kg and 55 kg. Valve choice is PX-32A or CGA 580.

The 50 L cylinder does not contain 50 litres of krypton. It contains about 10 cubic metres, and that is the figure to divide your price by.

Ten cubic metres, which is the number to put beside the unit price before you compare two quotes.

Cylinder deposit and return freight sit outside the price and can swing the invoice. Ask who owns the steel and who pays the next test.

What to put on the PO

A krypton order goes wrong in predictable places.

• Gas and grade spelled out, as in “krypton 99.999%”, not “high purity krypton”.
• The impurity table attached, with the limits you will test against at goods-in.
• Package size, gas content in m³ and valve type, PX-32A or CGA 580, matched to your regulator.
• A CoA per batch, tied to cylinder numbers, with the analytical method named.
• Destination and end use, so the export documents fit the right jurisdiction.

We have filled specialty gases since 2007, with three production sites, 32 analysers and export to more than 40 countries. Ten years of dangerous goods work sits behind the documents.

The full datasheet sits on the krypton product page at nrdgas.com.

FAQ

Why is krypton so much more expensive than argon?
Argon is a bulk product of air separation; krypton is a trace one. At 1.1 ppm, recovering it means pushing an enormous volume of air through a cold box for a small yield. Thin supply, high cost per cubic metre.

How much gas is in a 50 L krypton cylinder?
About 10 cubic metres. The 40 L cylinder holds 6 m³. Use that figure when you compare quotes, because cylinder counts hide the difference between a full 50 L and a partly filled one. Ask for gas content in m³ on every offer.

Can I use krypton in insulating glass instead of argon?
Yes, and it works better in narrow cavities, which is why thin triple glazing and slim retrofit frames specify it. Cost is the constraint: krypton runs far higher per cubic metre of fill. Most IG producers keep it for units where argon cannot reach the target U-value.

What purity grades of krypton can you supply?
From 99.99% to 99.9999%, with impurity limits quoted per grade. Water, CF4, oxygen plus argon and xenon are the rows that decide fitness. Tell us the application and we will quote the grade that fits it, not the highest one on the list.

Why do krypton market reports disagree so much?
Scope. Growth Market Reports shows USD 405 million for 2025, SkyQuest shows USD 61.21 million for 2024, and Expert Market Research shows USD 66.56 million for 2025. Merchant-only versus captive volume, and whether equipment is included, explains most of the gap. Treat them as direction, not pricing.

Do you ship krypton cylinders for export?
Yes. We have filled specialty gases since 2007 and export to more than 40 countries, with ten years of dangerous goods export experience behind the documents. Send the destination and the end use with the inquiry, and confirm the import requirements on your side too.

Sources

• Growth Market Reports — krypton market, 2025 to 2034, CAGR 5.4%
• SkyQuest — krypton market, 2024 to 2033
• Expert Market Research — note dated 10 September 2026, 2025 base, CAGR 2.38% to 2035
• Future Market Insights — product mix note dated 13 June 2026
• Newradar product page — nrdgas.com/kr-krypton-gas-product/ (retrieved 23 October 2026)