---
title: "Gas cylinder colours: the shoulder shows the hazard"
description: "Gas cylinder colours for technical gases (EN 1089-3:2011): red shoulder means flammable, light blue oxidising, light green inert, yellow toxic or corrosive."
canonical_url: "https://www.renggli.pl/en/blog/gas-cylinder-colours"
language: "en"
published: "2026-10-19"
last_updated: "2026-10-19"
alternates:
  pl: "https://www.renggli.pl/pl/blog/kolory-butli-gazowych.md"
  de: "https://www.renggli.pl/de/blog/gasflaschen-farben.md"
  uk: "https://www.renggli.pl/uk/blog/kolory-hazovykh-balioniv.md"
  lt: "https://www.renggli.pl/lt/blog/duju-balionu-spalvos.md"
---

# Gas cylinder colours: the shoulder shows the hazard

> Gas cylinder colours for technical gases (EN 1089-3:2011): red shoulder means flammable, light blue oxidising, light green inert, yellow toxic or corrosive.

Published 2026-10-19 · Category: [Utilities and installations](https://www.renggli.pl/en/blog/category/utilities-and-installations) · Author: [Renggli Team](https://www.renggli.pl/en/blog/author/zespol-renggli) · 12 min read

Post tags: [Technical gases](https://www.renggli.pl/en/blog/tag/technical-gases), [EN 1089-3](https://www.renggli.pl/en/blog/tag/en-1089-3), [EN 13792](https://www.renggli.pl/en/blog/tag/en-13792), [CLP Regulation](https://www.renggli.pl/en/blog/tag/clp-regulation)

Gas cylinder colours hint at the hazard a gas carries, but they do not tell you what is inside. The [occupational health and safety instruction of Maria Curie-Skłodowska University](https://phavi.umcs.pl/at/attachments/2026/0413/092640-zalacznik-nr-1-do-instrukcji-i-08-bhp-2026.pdf) (UMCS) from April 2026 recommends treating the colours of technical gas cylinders as an additional source of information. Besides the colours of 4 hazard groups, the instruction gives, in a separate table, its own shoulder colour for seven gases, including oxygen, argon and acetylene. At the workstation, the choice of [laboratory taps and valves](https://www.renggli.pl/en/offer/laboratory-armature-and-valves) also depends on the gas group, because valves for flammable and non-flammable gases are separate products.

**Key points**

- Of the gases with an individual marking, 4 have a second permitted shoulder colour, so a nitrogen cylinder may be black or light green.
- In the EN 1089-3:2011 table quoted in the UMCS instruction, oxygen has a white shoulder, while the cylindrical part of a technical oxygen cylinder is blue, a colour set by gas companies in Poland.
- The valve card for flammable gases lists 3 media: hydrogen, methane and propane. The CLP Annex VI entry of each of these three gases carries hazard statement H220.
- A 2024 Air Liquide Polska brochure points out that the standard does not cover LPG cylinders or fire extinguishers.

## What do gas cylinder colours mean? {#what-do-gas-cylinder-colours-mean}

The colour of the shoulder, the rounded top part of the cylinder, shows the hazard group of the gas. The UMCS instruction quotes the table from EN 1089-3:2011 as a recommendation for university laboratories: a flammable gas has a red shoulder and an oxidising gas a light blue one. Inert gases have a light green shoulder, and toxic and corrosive gases a yellow one.

**Full list: cylinder shoulder colour by gas property, n = 4 groups; colours of technical gas cylinders according to EN 1089-3:2011 as transcribed in the UMCS occupational health and safety instruction (p. 14), document status on 19 October 2026, dataset version 2026-10-19**

| Gas group | Shoulder colour | Colour name in the RAL register |
| --- | --- | --- |
| toxic and/or corrosive gases | yellow | zinc yellow |
| flammable gases | red | flame red |
| oxidising gases | light blue | light blue |
| inert gases | light green | yellow green |

Source: UMCS occupational health and safety instruction Z-01/I-08/BHP/2026, Renggli analysis. Data: https://mom5efytyj47lt9h.public.blob.vercel-storage.com/kolory-butli-gazowych-2026-10-19-hazard_colours.csv

The instruction also gives examples for three of the groups: flammable gases, inert gases, and toxic and corrosive gases; there is no example of an oxidising gas. Hydrogen and methane are flammable gases, xenon and krypton are inert, and ammonia, chlorine and sulphur dioxide are toxic or corrosive. According to the [Air Liquide Polska brochure](https://pl.airliquide.com/statics/2024-07/oznakowanie_barwne_butli_gazowych_pl_2024.pdf?VersionId=zHM9jeX688kRiBlIL8iEHkmndnf3jqB1), air and mixtures of inert gases also have a light green shoulder.

## What colour is an oxygen, nitrogen, argon or acetylene cylinder? {#what-colour-is-an-oxygen-nitrogen-argon-or-acetylene-cylinder}

In the standard these gases have a colour of their own, independent of the group. The table of individual markings in the UMCS instruction covers seven gases, of which 4 have a second permitted colour.

Acetylene has a chestnut shoulder, oxygen a white one and nitrous oxide a blue one. Argon, nitrogen, helium and carbon dioxide have a colour of their own or the light green of inert gases. An argon cylinder may therefore have a dark green or a light green shoulder, and both comply with the table.

**List of individual markings: gases with their own shoulder colour and a second permitted colour where the table gives one; colours of technical gas cylinders according to EN 1089-3:2011 as transcribed in the UMCS occupational health and safety instruction (p. 14), document status on 19 October 2026, dataset version 2026-10-19**

| Gas or mixture | Shoulder colour | Second permitted colour |
| --- | --- | --- |
| acetylene | chestnut | none |
| argon | dark green | light green |
| nitrogen | black | light green |
| helium | brown | light green |
| oxygen | white | none |
| nitrous oxide | blue | none |
| carbon dioxide | grey | light green |

Source: UMCS occupational health and safety instruction Z-01/I-08/BHP/2026, Renggli analysis. Data: https://mom5efytyj47lt9h.public.blob.vercel-storage.com/kolory-butli-gazowych-2026-10-19-gas_colours.csv

Two nitrogen cylinders can therefore stand side by side in a laboratory, one with a black shoulder and the other with a light green one, and both are marked correctly. The shoulder colour narrows the choice but does not settle the name of the gas.

## Shoulder or cylindrical part: why is oxygen both white and blue? {#shoulder-or-cylindrical-part-why-is-oxygen-both-white-and-blue}

Because the standard colours only the shoulder. The Air Liquide Polska brochure says so outright: “Colour marking has been regulated only for the cylinder shoulder”. The UMCS instruction adds that the standard does not strictly define the colour of the cylindrical part of technical gas cylinders.

The colour of the cylindrical part was set by gas companies in Poland. Technical oxygen has a blue cylindrical part and a white shoulder, hence two descriptions of the same cylinder.

**Selected groups: colour of the cylindrical part of the cylinder set by gas companies in Poland, n = 4 groups; the standard does not strictly define it; colours of technical gas cylinders as transcribed in the UMCS occupational health and safety instruction (p. 13), document status on 19 October 2026, dataset version 2026-10-19**

| Type of gas | Colour of the cylindrical part | RAL colour |
| --- | --- | --- |
| medical gases and breathing mixtures | white | alpine white |
| gases for the food industry | light green | pale green |
| acetylene | chestnut | oxide red |
| technical oxygen | blue | medium blue |

Source: UMCS occupational health and safety instruction Z-01/I-08/BHP/2026, Renggli analysis. Data: https://mom5efytyj47lt9h.public.blob.vercel-storage.com/kolory-butli-gazowych-2026-10-19-body_colours.csv

> **Warning: Colour does not replace the label**
>
> The UMCS instruction stresses that the colour is not used to identify the gas. It is only an additional source of information about its dangerous properties. The Air Liquide Polska brochure adds that “the only binding marking of the cylinder contents is the label together with the warning stickers”.

## Does EN 1089-3 cover propane cylinders and fire extinguishers? {#does-en-1089-3-cover-propane-cylinders-and-fire-extinguishers}

No. According to the Air Liquide Polska brochure, the standard does not apply to cylinders with liquefied petroleum gas (LPG) or to gases used for cooling. Portable and stationary extinguisher cylinders are also excluded. A red extinguisher therefore says nothing about a flammable gas.

The exclusion of LPG is also visible in the title of the standard on the [SS-EN 1089-3:2011 card in the SIS catalogue](https://www.sis.se/en/produkter/standardization/colour-coding/ssen108932011/): “Gas cylinder identification (excluding LPG)”. The card for this Swedish edition shows the status “Valid” and indicates that it replaced SS-EN 1089-3:2004. The European standard EN 1089-3 itself appeared in 1997, as the UMCS instruction recalls, and that instruction describes the colour marking of LPG cylinders separately.

## Which valves suit flammable gases and which non-flammable ones? {#which-valves-suit-flammable-gases-and-which-non-flammable-ones}

Flammable gases are connected to valves for flammable gases, and oxygen, nitrogen, argon, helium and carbon dioxide to valves for non-flammable gases. The valve card for flammable gases lists 3 media: hydrogen, methane and propane.

The CLP Annex VI entry for each of these three gases carries hazard statement H220, extremely flammable gas, as can be seen, for example, in the [first of these entries read in PubChem](https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/data/compound/783/JSON?heading=GHS%20Classification). In the UMCS table, hydrogen and methane have the red shoulder of flammable gases. Propane in a cylinder is one of the liquefied LPG gases that EN 1089-3 does not cover, so the standard's table gives no colour for it.

- [Valves for Flammable Gases](https://www.renggli.pl/en/offer/laboratory-armature-and-valves/gaseus-gases)

The valve card for non-flammable gases lists oxygen, nitrogen, carbon dioxide, argon, helium, compressed air and vacuum among the media. Non-flammable does not mean inert, however. The Annex VI entry for oxygen as a gas carries hazard statement H270, may cause or intensify fire; oxidiser, and its [PubChem entry](https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/data/compound/977/JSON?heading=GHS%20Classification) shows the same.

Nitrogen, carbon dioxide, argon and helium as gases have no harmonised entry in Annex VI, so there is no flammable gas statement for them. Vacuum has no cylinder, and according to the Air Liquide brochure compressed air has a light green shoulder.

- [Valves for Non-Flammable Gases](https://www.renggli.pl/en/offer/laboratory-armature-and-valves/non-flammable-gases)

**Media from the Renggli valve cards for flammable and non-flammable gases (status on 19 October 2026) with the shoulder colour from the colours of technical gas cylinders and the CLP Annex VI entry read through PubChem; dataset version 2026-10-19**

| Medium | Renggli valve card | Cylinder shoulder colour | Annex VI entry for the gas |
| --- | --- | --- | --- |
| hydrogen | Valves for flammable gases | red (example of flammable gases) | H220, extremely flammable gas |
| methane | Valves for flammable gases | red (example of flammable gases) | H220, extremely flammable gas |
| propane | Valves for flammable gases | LPG, outside EN 1089-3 | H220, extremely flammable gas |
| oxygen | Valves for non-flammable gases | white (individual marking) | H270, oxidising gas |
| nitrogen | Valves for non-flammable gases | black or light green | no harmonised entry |
| carbon dioxide | Valves for non-flammable gases | grey or light green | no harmonised entry |
| argon | Valves for non-flammable gases | dark green or light green | no harmonised entry |
| helium | Valves for non-flammable gases | brown or light green | no harmonised entry |
| compressed air | Valves for non-flammable gases | light green (supplier example) | not applicable |
| vacuum | Valves for non-flammable gases | no cylinder | not applicable |

Source: Renggli product cards, UMCS occupational health and safety instruction, Air Liquide Polska brochure, CLP Annex VI (read through PubChem), Renggli analysis. Data: https://mom5efytyj47lt9h.public.blob.vercel-storage.com/kolory-butli-gazowych-2026-10-19-valve_media.csv

## Gas cylinder colours at the workstation: a checklist {#gas-cylinder-colours-at-the-workstation-a-checklist}

Before a cylinder goes to the workstation, the shoulder colour and the label tell you which valve to connect it to. The list is based on the documents cited above and on the valve cards.

1. **Read the cylinder label**

    The name of the gas and the warning stickers decide what the cylinder contains. The Air Liquide Polska brochure calls the label the only binding marking.
2. **Check the shoulder colour**

    The shoulder shows the group: flammable, oxidising, inert, or toxic and corrosive. For nitrogen, argon, helium and carbon dioxide, two colours are correct.
3. **Do not judge the gas by the cylindrical part**

    Its colour was set by gas companies, and the standard does not strictly define it. A blue cylindrical part with a white shoulder is technical oxygen.
4. **Match the valve to the gas group**

    Hydrogen, methane and propane go to valves for flammable gases. Oxygen, nitrogen, argon, helium, carbon dioxide and compressed air go to valves for non-flammable gases, remembering that oxygen is an oxidiser.
5. **For an LPG cylinder, ask the supplier about the marking**

    EN 1089-3 does not cover LPG, so the colour of such a cylinder cannot be read from the standard's table.

Where to keep cylinders near the laboratory is described in the article on the [cabinet for technical gas cylinders](https://www.renggli.pl/en/blog/gas-cylinder-cabinet-safety-ventilation-requirements), and the design of the whole network in the article on [technical gas installations](https://www.renggli.pl/en/blog/technical-gas-installations-design-installation-and-standards).

## Technical gas cylinder colours: method and data {#technical-gas-cylinder-colours-method-and-data}

We did not read the text of EN 1089-3:2011, because it is paid. We transcribed the colour tables from two open documents that summarise it: the UMCS occupational health and safety instruction from April 2026 (pages 13 to 16) and the Air Liquide Polska brochure from 2024. Both documents were read on 19 October 2026.

The table below covers 16 different gases. It has more rows, because a gas with two permitted colours takes two, and a gas from a group example has the colour of that group. Propane as LPG stands in the table without a colour, because the standard does not cover it.

**Full transcription list: n = 16 gases (a gas with two colours has two rows); colours of technical gas cylinders according to EN 1089-3:2011 from the UMCS occupational health and safety instruction and the Air Liquide Polska brochure, document status on 19 October 2026, dataset version 2026-10-19**

| Gas or mixture | Basis of the colour | Shoulder colour | Source and page |
| --- | --- | --- | --- |
| acetylene | individual | chestnut | UMCS, p. 14 |
| argon | individual, colour 1 | dark green | UMCS, p. 14 |
| argon | individual, colour 2 | light green | UMCS, p. 14 |
| nitrogen | individual, colour 1 | black | UMCS, p. 14 |
| nitrogen | individual, colour 2 | light green | UMCS, p. 14 |
| helium | individual, colour 1 | brown | UMCS, p. 14 |
| helium | individual, colour 2 | light green | UMCS, p. 14 |
| oxygen | individual | white | UMCS, p. 14 |
| nitrous oxide | individual | blue | UMCS, p. 14 |
| carbon dioxide | individual, colour 1 | grey | UMCS, p. 14 |
| carbon dioxide | individual, colour 2 | light green | UMCS, p. 14 |
| ammonia | example of toxic and corrosive gases | yellow | UMCS, p. 15 |
| chlorine | example of toxic and corrosive gases | yellow | UMCS, p. 15 |
| sulphur dioxide | example of toxic and corrosive gases | yellow | UMCS, p. 15 |
| hydrogen | example of flammable gases | red | UMCS, p. 15 |
| methane | example of flammable gases | red | UMCS, p. 15 |
| xenon | example of inert gases | light green | UMCS, p. 15 |
| krypton | example of inert gases | light green | UMCS, p. 15 |
| air | supplier example | light green | Air Liquide Polska, p. 2 |
| propane (LPG) | outside the standard | none in the standard's table | UMCS, p. 16 |

Source: UMCS occupational health and safety instruction Z-01/I-08/BHP/2026 and Air Liquide Polska brochure 2024, Renggli analysis. Data: https://mom5efytyj47lt9h.public.blob.vercel-storage.com/kolory-butli-gazowych-2026-10-19-gas_colours.csv

The media from the valve cards are recognised by a closed vocabulary of names in the text of the product cards in the CMS. The classification of the gases was read from PubChem as CLP Annex VI entries, without company notifications to ECHA. Nitrogen, carbon dioxide, argon and helium have no such entry.

**About the data: Colour coding of technical gas cylinders and laboratory valves for flammable and non-flammable gases**

- Sample: 18
- Observation period: 19 October 2026 to 19 October 2026
- Collected: 19 October 2026
- Version: 2026-10-19
- Licence: CC BY 4.0

This dataset covers the colours of technical gas cylinders according to EN 1089-3:2011, transcribed from two open documents, and the media from two Renggli valve cards with the CLP classification of those gases. The creator of the dataset is Renggli, licence CC BY 4.0.

Observation period: the state of the source documents and product cards on 19 October 2026, dataset version 2026-10-19. The date of research does not apply, because the dataset contains no measurements. The transcription was carried out by the Renggli editorial team.

The source documents are the occupational health and safety instruction of Maria Curie-Skłodowska University, annex Z-01/I-08/BHP/2026 from April 2026, and the Air Liquide Polska brochure “Oznakowanie barwne butli gazowych” (Colour marking of gas cylinders) from 2024. They are two independent documents, but both summarise the same standard, so the agreement of the colours confirms the transcription and not the content of the standard. The media come from the cards “Zawory do gazów palnych” (Valves for flammable gases) and “Zawory do gazów niepalnych” (Valves for non-flammable gases) in the Renggli CMS, and the CLP Annex VI entries from PubChem (NCBI).

Scope: 16 gases, 4 hazard groups and 4 colours of the cylindrical part. For the 2 valve cards, the table in the text gives 10 media. For the gases from the cards, the dataset has 4 Annex VI entries. The figures are counts of closed lists, not shares.

Verification status: transcription of colour code tables from 2 open documents, each row checked with anchors in the text of the PDF copy from the day of reading; media from 2 Renggli product cards; harmonised CLP classification read through PubChem.

Method: each row of the table has a source and a page, and during collection the gas name and the RAL number must appear in the text of the PDF copy from the day of reading. A source cell with two colours gives two rows. A flammable gas is an entry with hazard statement H220 or H221, an oxidising gas an entry with hazard statement H270.

Limitations: the content of the standard is paid and was not read, so the colours come from documents that summarise it; the university instruction is a recommendation, and the brochure is a document from a gas supplier. The dataset does not cover the colours of medical and food gases beyond the cylindrical part, the marking of LPG cylinders, or the marking of valves according to EN 13792. The media vocabulary recognises only the names on the list. PubChem is a place of reading, not the text of the regulation.

CSV files: hazard\_colours.csv (shoulder colour by group), gas\_colours.csv (gas colours), body\_colours.csv (cylindrical part), valve\_media.csv (media from the cards), clp\_entries.csv (Annex VI entries) and chem\_candidates.csv (CLP candidate rows).

Suggested citation: Renggli (2026). Colour code of technical gas cylinders and laboratory valves for flammable and non-flammable gases. Version 2026-10-19. Licence CC BY 4.0.

The text was prepared by the Renggli editorial team; every number comes from this dataset or from the source cited in the sentence.

Sources:

- [https://phavi.umcs.pl/at/attachments/2026/0413/092640-zalacznik-nr-1-do-instrukcji-i-08-bhp-2026.pdf](https://phavi.umcs.pl/at/attachments/2026/0413/092640-zalacznik-nr-1-do-instrukcji-i-08-bhp-2026.pdf)
- [https://pl.airliquide.com/statics/2024-07/oznakowanie\_barwne\_butli\_gazowych\_pl\_2024.pdf?VersionId=zHM9jeX688kRiBlIL8iEHkmndnf3jqB1](https://pl.airliquide.com/statics/2024-07/oznakowanie_barwne_butli_gazowych_pl_2024.pdf?VersionId=zHM9jeX688kRiBlIL8iEHkmndnf3jqB1)
- [https://renggli-cms.vercel.app/api/products?where\[slug\]\[in\]=do-gazow-palnych,do-gazow-niepalnych&locale=pl](https://renggli-cms.vercel.app/api/products?where[slug][in]=do-gazow-palnych,do-gazow-niepalnych&locale=pl)
- [https://pubchem.ncbi.nlm.nih.gov/compound/977#section=GHS-Classification](https://pubchem.ncbi.nlm.nih.gov/compound/977#section=GHS-Classification)
- [https://pubchem.ncbi.nlm.nih.gov/compound/947](https://pubchem.ncbi.nlm.nih.gov/compound/947)
- [https://pubchem.ncbi.nlm.nih.gov/compound/280](https://pubchem.ncbi.nlm.nih.gov/compound/280)
- [https://pubchem.ncbi.nlm.nih.gov/compound/23968](https://pubchem.ncbi.nlm.nih.gov/compound/23968)
- [https://pubchem.ncbi.nlm.nih.gov/compound/23987](https://pubchem.ncbi.nlm.nih.gov/compound/23987)
- [https://pubchem.ncbi.nlm.nih.gov/compound/783#section=GHS-Classification](https://pubchem.ncbi.nlm.nih.gov/compound/783#section=GHS-Classification)
- [https://pubchem.ncbi.nlm.nih.gov/compound/297#section=GHS-Classification](https://pubchem.ncbi.nlm.nih.gov/compound/297#section=GHS-Classification)
- [https://pubchem.ncbi.nlm.nih.gov/compound/6334#section=GHS-Classification](https://pubchem.ncbi.nlm.nih.gov/compound/6334#section=GHS-Classification)

Files:

- [kolory-butli-gazowych-2026-10-19-hazard\_colours.csv](https://mom5efytyj47lt9h.public.blob.vercel-storage.com/kolory-butli-gazowych-2026-10-19-hazard_colours.csv) (4 rows · 0 kB)
- [kolory-butli-gazowych-2026-10-19-gas\_colours.csv](https://mom5efytyj47lt9h.public.blob.vercel-storage.com/kolory-butli-gazowych-2026-10-19-gas_colours.csv) (23 rows · 2 kB)
- [kolory-butli-gazowych-2026-10-19-body\_colours.csv](https://mom5efytyj47lt9h.public.blob.vercel-storage.com/kolory-butli-gazowych-2026-10-19-body_colours.csv) (5 rows · 1 kB)
- [kolory-butli-gazowych-2026-10-19-valve\_media.csv](https://mom5efytyj47lt9h.public.blob.vercel-storage.com/kolory-butli-gazowych-2026-10-19-valve_media.csv) (11 rows · 2 kB)
- [kolory-butli-gazowych-2026-10-19-clp\_entries.csv](https://mom5efytyj47lt9h.public.blob.vercel-storage.com/kolory-butli-gazowych-2026-10-19-clp_entries.csv) (4 rows · 1 kB)
- [kolory-butli-gazowych-2026-10-19-chem\_candidates.csv](https://mom5efytyj47lt9h.public.blob.vercel-storage.com/kolory-butli-gazowych-2026-10-19-chem_candidates.csv) (8 rows · 5 kB)
- [kolory-butli-gazowych-2026-10-19-summary.json](https://mom5efytyj47lt9h.public.blob.vercel-storage.com/kolory-butli-gazowych-2026-10-19-summary.json) (31 kB)
- [kolory-butli-gazowych-2026-10-19-feasibility.json](https://mom5efytyj47lt9h.public.blob.vercel-storage.com/kolory-butli-gazowych-2026-10-19-feasibility.json) (3 kB)
- [kolory-butli-gazowych-2026-10-19-datapackage.json](https://mom5efytyj47lt9h.public.blob.vercel-storage.com/kolory-butli-gazowych-2026-10-19-datapackage.json) (35 kB)

## Frequently asked questions {#frequently-asked-questions}

**What colour is a technical oxygen cylinder?**

The shoulder is white and the cylindrical part is blue. The white shoulder of oxygen is given by the table of individual markings, and the blue cylindrical part was set by gas companies in Poland.

**What colour is a carbon dioxide cylinder?**

The shoulder is grey or light green, because the table permits both colours.

**Is a red cylinder always a flammable gas?**

No. A red shoulder means a flammable gas only on a cylinder covered by EN 1089-3, and the standard does not cover extinguishers or LPG cylinders.

**Do gas cylinder colours apply to propane-butane?**

No. Propane-butane is liquefied LPG gas, and EN 1089-3 does not apply to LPG cylinders, so the supplier and the label tell you how such a cylinder is marked.

**Is the cylinder colour enough to identify the gas?**

No. The shoulder colour is additional information about the hazard, and the contents of the cylinder are settled by the label with its warning stickers.

**Enquiry about valves for technical gases** You can attach to the enquiry a list of the gases at your workstation, with the names from the cylinder labels. [Send an enquiry](https://www.renggli.pl/en/contact)

## Sources

- [Uniwersytet Marii Curie-Skłodowskiej w Lublinie, Ogólna instrukcja bezpieczeństwa i higieny pracy dotycząca użytkowania gazów technicznych, załącznik Z-01/I-08/BHP/2026: Zasady cechowania, oznaczania barwnego oraz etykietowania zbiorników przenośnych z gazami technicznymi, wydanie I, kwiecień 2026](https://phavi.umcs.pl/at/attachments/2026/0413/092640-zalacznik-nr-1-do-instrukcji-i-08-bhp-2026.pdf), Inspektor ds. BHP
- [Air Liquide Polska Sp. z o.o., Oznakowanie barwne butli gazowych, broszura, 2024](https://pl.airliquide.com/statics/2024-07/oznakowanie_barwne_butli_gazowych_pl_2024.pdf?VersionId=zHM9jeX688kRiBlIL8iEHkmndnf3jqB1), Air Liquide Polska Sp. z o.o.
- [SIS, SS-EN 1089-3:2011 Transportable gas cylinders - Gas cylinder identification (excluding LPG) - Part 3: Colour coding](https://www.sis.se/en/produkter/standardization/colour-coding/ssen108932011/), Swedish Institute for Standards (SIS)
- [SIS, SS-EN 13792 Colour coding of taps and valves for use in laboratories](https://www.sis.se/en/produkter/standardization/colour-coding/ssen13792/), Swedish Institute for Standards (SIS)
- [PubChem, Hydrogen (CID 783), GHS Classification](https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/data/compound/783/JSON?heading=GHS%20Classification), National Center for Biotechnology Information, PubChem
- [PubChem, Methane (CID 297), GHS Classification](https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/data/compound/297/JSON?heading=GHS%20Classification), National Center for Biotechnology Information, PubChem
- [PubChem, Propane (CID 6334), GHS Classification](https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/data/compound/6334/JSON?heading=GHS%20Classification), National Center for Biotechnology Information, PubChem
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