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Identification of Contents

Cylinder identification should always follow local standards. BS EN ISO 7225: 2007 has replaced BS EN 1089-2, as the standard for cylinder labelling. This is an International Standard, therefore, all cylinders, used anywhere in the world, can be labelled to this standard.

“Precautionary labels” must contain an international hazard diamond together with the name and UN number of the gas or gas mixture. If this name is not a real name, e.g. Nitrox, then the chemical formula must be included e.g. N2/O2. If the mixture can vary, as with Nitrox, Heliox and Trimix, the percentages of the mixture must be included on this or on a separate label. The label must also contain the filling company’s name and contact details (for this reason ASSET does not sell contents labels). Additionally, in the UK, the HSE have asked the industry to include the Maximum Operating Depth on labels used for mixed gases on diving cylinders.
BS EN 1089-3 defines the colours that identify either the hazard or the specific gas. A combination of colours is used to identify a compound hazard or a gas mixture. In this Standard, only the shoulder colour is significant, therefore, the cylinder body colour could be used for visibility or personal identification. The shoulder colours of an Air or Nitrox cylinder are Black and White; Heliox are Brown and White and Trimix are Black, Brown and White.

Label Artwork

The above labels are designed in accordance with BS EN ISO 7225, for SCUBA cylinders labels and in line with HSE advice (Jan 06). The HSE advice reduces the number of labels required from a possible 6 to 3 i.e. breathing Air, Oxygen and a common label for Nitrox, Heliox and Trimix. The design incorporates a space to add company name and contact details.

The following artwork is available FREE OF CHARGE on request to ASSET Members:

  • Air compressed
  • Compressed Gas Oxidizing (Nitrox, Tri-mix, Heliox)
  • Oxygen
  • Oxygen Clean (ASSET Nitrox Technicians only)

The artwork is in JPEG format (other formats can be provided on request).

Cylinder Inspection and Test Marking

When a cylinder is inspected or tested BS EN 1802 and BS EN 1968 require it to be marked to show when the next test is due and stamp marked in accordance with BS EN ISO 13769 which in turn gives the positioning, content and layout of the stamp marking. The test station or “house” mark must be unique and difficult to copy. The layout should be: House mark YY/MM. The stamp markings must be above the shoulder not on the parallel (in certain circumstances, on a neck ring, where provided).

There is an anomaly in the standards which do not make provision for differentiating between a full inspection and test and a visual inspection only. In the UK it has been customary to add the letter “V” when a visual inspection only has been performed. ASSET and the HSE recommend that this practice continues for SCUBA cylinders.

In the UK, prior to 2002, the test date was stamped MM/YY which is the reverse of current practice. This could cause confusion; for example a date of 01/12 could be interpreted as tested in January 2012 but could in fact be an out of test cylinder from December 2001. Therefore, we recommend that until 2013 UK test stations stamp the year as four digits thus: YYYY/MM.

The required “next test due” can be marked in different ways, the simplest being an adhesive label on which the year and month are punched out to indicate the date.


The above “Next Test Due” labels are only available to ASSET approved test stations.

Contact scubatechnician@aol.com for current price and availability.


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