Reference tools

Gas charts, tables & calculators

Free reference tools for anyone working with industrial gases — built on published standards and physical constants, with every source stated.

Gas unit converter
Convert Nm³, kg, SCF, pounds and litres for any industrial gas — plus the density tables the conversion depends on.
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Cylinder colour code chart
Ground colours and neck bands to IS 4379, with the oxygen-vs-CO₂ black cylinder trap explained.
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Gas properties table
Molecular weight, density, boiling and critical points, vapour density and flammable limits for every common industrial gas.
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Free to use — and built from real plant data

Every chart and calculator here is drawn from the same dataset we use for our own plants. If you need the gas rather than the numbers, we supply that too.