asset: gas-cylinder-color-codes

asset_type: jurisdictional-variation

body: Color coding of compressed gas cylinders (shoulder and body colors) for medical, industrial and laboratory gases under different national and international standards. Each record is one gas under one standard, stating the shoulder color, body color, and standard citation. Covers ISO 32, US CGA C-9 / NFPA 99, EN 1089-3, BIS IS 3933 (India), and AS 4484 (Australia). Answers 'what color is an oxygen cylinder', 'ISO vs CGA gas cylinder colors', 'medical gas cylinder colour code UK', and 'nitrogen cylinder color India'. Oxygen is green (US) vs white (ISO) — a safety-critical difference that assistants routinely get wrong by stating one standard as universal.

key_field: gas

licence: Facts extracted from freely published reference pages. Color codes are regulatory/safety standards and not copyrightable. EIGA Doc 177 is a freely published industry standard document.

title: Gas cylinder color codes by standard and country

type: dataset


body:
**Gas:** Air

**Standard:** BIS IS 3933 (India)

**Shoulder color:** Grey

**Body color:** Grey

> S. No. | Gas Type | Shoulder Color | Body Color | 1 | Air | Grey | Grey

Source: <https://www.webofpharma.com/2025/12/gas-cylinder-color-coding.html>

body_color: Grey

gas: Air

shoulder_color: Grey

standard: BIS IS 3933 (India)

title: Air — Gas cylinder color codes by standard and country

type: jurisdictional-variation

unverified_fields: standard


body:
**Gas:** Air

**Standard:** BIS IS 3933 (India)

**Shoulder color:** Grey

**Body color:** Grey

> S. No. | Gas Cylinder | Color | Shoulder | Body | 1. | Air | Grey | Grey

Source: <https://www.pharmaguideline.com/2014/01/olor-codes-for-gas-cylinders-in-pharma.html>


body:
**Gas:** Ammonia

**Standard:** BIS IS 3933 (India)

**Shoulder color:** Red

**Body color:** Yellow & Black

> S. No. | Gas Type | Shoulder Color | Body Color | 1 | Air | Grey | Grey | 2 | Ammonia | Red | Yellow & Black

Source: <https://www.webofpharma.com/2025/12/gas-cylinder-color-coding.html>

body_color: Yellow & Black

gas: Ammonia

shoulder_color: Red

title: Ammonia — Gas cylinder color codes by standard and country


body:
**Gas:** Ammonia

**Standard:** BIS IS 3933 (India)

**Shoulder color:** Red

**Body color:** Yellow & Black

> S. No. | Gas Cylinder | Color | Shoulder | Body | 1. | Air | Grey | Grey | 2. | Ammonia | Red | Yellow & Black

Source: <https://www.pharmaguideline.com/2014/01/olor-codes-for-gas-cylinders-in-pharma.html>


body:
**Gas:** Carbon Dioxide

**Standard:** BIS IS 3933 (India)

**Shoulder color:** Silver

**Body color:** Black

> S. No. | Gas Type | Shoulder Color | Body Color | 1 | Air | Grey | Grey | 2 | Ammonia | Red | Yellow & Black | 3 | Carbon Dioxide | Silver | Black

Source: <https://www.webofpharma.com/2025/12/gas-cylinder-color-coding.html>

body_color: Black

gas: Carbon Dioxide

shoulder_color: Silver

title: Carbon Dioxide — Gas cylinder color codes by standard and country


body:
**Gas:** Carbon Dioxide

**Standard:** BIS IS 3933 (India)

**Shoulder color:** Silver

**Body color:** Black

> S. No. | Gas Cylinder | Color | Shoulder | Body | 1. | Air | Grey | Grey | 2. | Ammonia | Red | Yellow & Black | 3. | Carbon Dioxide | Silver | Black

Source: <https://www.pharmaguideline.com/2014/01/olor-codes-for-gas-cylinders-in-pharma.html>


body:
**Gas:** Chlorine

**Standard:** BIS IS 3933 (India)

**Shoulder color:** Yellow

**Body color:** Yellow

> S. No. | Gas Type | Shoulder Color | Body Color | 1 | Air | Grey | Grey | 2 | Ammonia | Red | Yellow & Black | 3 | Carbon Dioxide | Silver | Black | 4 | Chlorine | Yellow | Yellow

Source: <https://www.webofpharma.com/2025/12/gas-cylinder-color-coding.html>

body_color: Yellow

gas: Chlorine

shoulder_color: Yellow

title: Chlorine — Gas cylinder color codes by standard and country


body:
**Gas:** Chlorine

**Standard:** BIS IS 3933 (India)

**Shoulder color:** Yellow

**Body color:** Yellow

> S. No. | Gas Cylinder | Color | Shoulder | Body | 1. | Air | Grey | Grey | 2. | Ammonia | Red | Yellow & Black | 3. | Carbon Dioxide | Silver | Black | 4. | Chlorine | Yellow | Yellow

Source: <https://www.pharmaguideline.com/2014/01/olor-codes-for-gas-cylinders-in-pharma.html>


body:
**Gas:** Helium

**Standard:** BIS IS 3933 (India)

**Shoulder color:** Brown

**Body color:** Brown

> S. No. | Gas Type | Shoulder Color | Body Color | 1 | Air | Grey | Grey | 2 | Ammonia | Red | Yellow & Black | 3 | Carbon Dioxide | Silver | Black | 4 | Chlorine | Yellow | Yellow | 5 | Helium | Brown | Brown

Source: <https://www.webofpharma.com/2025/12/gas-cylinder-color-coding.html>

body_color: Brown

gas: Helium

shoulder_color: Brown

title: Helium — Gas cylinder color codes by standard and country


body:
**Gas:** Helium

**Standard:** BIS IS 3933 (India)

**Shoulder color:** Brown

**Body color:** Brown

> S. No. | Gas Cylinder | Color | Shoulder | Body | 1. | Air | Grey | Grey | 2. | Ammonia | Red | Yellow & Black | 3. | Carbon Dioxide | Silver | Black | 4. | Chlorine | Yellow | Yellow | 5. | Helium | Brown | Brown

Source: <https://www.pharmaguideline.com/2014/01/olor-codes-for-gas-cylinders-in-pharma.html>


body:
**Gas:** Hydrogen

**Standard:** BIS IS 3933 (India)

**Shoulder color:** Red

**Body color:** Red

> S. No. | Gas Type | Shoulder Color | Body Color | 1 | Air | Grey | Grey | 2 | Ammonia | Red | Yellow & Black | 3 | Carbon Dioxide | Silver | Black | 4 | Chlorine | Yellow | Yellow | 5 | Helium | Brown | Brown | 6 | Hydrogen | Red | Red

Source: <https://www.webofpharma.com/2025/12/gas-cylinder-color-coding.html>

body_color: Red

gas: Hydrogen

title: Hydrogen — Gas cylinder color codes by standard and country


body:
**Gas:** Hydrogen

**Standard:** BIS IS 3933 (India)

**Shoulder color:** Red

**Body color:** Red

> S. No. | Gas Cylinder | Color | Shoulder | Body | 1. | Air | Grey | Grey | 2. | Ammonia | Red | Yellow & Black | 3. | Carbon Dioxide | Silver | Black | 4. | Chlorine | Yellow | Yellow | 5. | Helium | Brown | Brown | 6. | Hydrogen | Red | Red

Source: <https://www.pharmaguideline.com/2014/01/olor-codes-for-gas-cylinders-in-pharma.html>


body:
**Gas:** Nitrogen

**Standard:** BIS IS 3933 (India)

**Shoulder color:** Black

**Body color:** Grey

> S. No. | Gas Type | Shoulder Color | Body Color | 1 | Air | Grey | Grey | 2 | Ammonia | Red | Yellow & Black | 3 | Carbon Dioxide | Silver | Black | 4 | Chlorine | Yellow | Yellow | 5 | Helium | Brown | Brown | 6 | Hydrogen | Red | Red | 7 | Nitrogen | Black | Grey

Source: <https://www.webofpharma.com/2025/12/gas-cylinder-color-coding.html>

gas: Nitrogen

shoulder_color: Black

title: Nitrogen — Gas cylinder color codes by standard and country


body:
**Gas:** Nitrogen

**Standard:** BIS IS 3933 (India)

**Shoulder color:** Black

**Body color:** Grey

> S. No. | Gas Cylinder | Color | Shoulder | Body | 1. | Air | Grey | Grey | 2. | Ammonia | Red | Yellow & Black | 3. | Carbon Dioxide | Silver | Black | 4. | Chlorine | Yellow | Yellow | 5. | Helium | Brown | Brown | 6. | Hydrogen | Red | Red | 7. | Nitrogen | Black | Grey

Source: <https://www.pharmaguideline.com/2014/01/olor-codes-for-gas-cylinders-in-pharma.html>


body:
**Gas:** Oxygen

**Standard:** BIS IS 3933 (India)

**Shoulder color:** White

**Body color:** Black

> S. No. | Gas Type | Shoulder Color | Body Color | 1 | Air | Grey | Grey | 2 | Ammonia | Red | Yellow & Black | 3 | Carbon Dioxide | Silver | Black | 4 | Chlorine | Yellow | Yellow | 5 | Helium | Brown | Brown | 6 | Hydrogen | Red | Red | 7 | Nitrogen | Black | Grey | 8 | Oxygen | White | Black

Source: <https://www.webofpharma.com/2025/12/gas-cylinder-color-coding.html>

gas: Oxygen

shoulder_color: White

title: Oxygen — Gas cylinder color codes by standard and country


body:
**Gas:** Oxygen

**Standard:** BIS IS 3933 (India)

**Shoulder color:** White

**Body color:** Black

> S. No. | Gas Cylinder | Color | Shoulder | Body | 1. | Air | Grey | Grey | 2. | Ammonia | Red | Yellow & Black | 3. | Carbon Dioxide | Silver | Black | 4. | Chlorine | Yellow | Yellow | 5. | Helium | Brown | Brown | 6. | Hydrogen | Red | Red | 7. | Nitrogen | Black | Grey | 8. | Oxygen | White | Black

Source: <https://www.pharmaguideline.com/2014/01/olor-codes-for-gas-cylinders-in-pharma.html>


body:
**Gas:** Carbon Dioxide

**Standard:** ISO 32

**Body color:** Grey

> Gas | Cylinder Body Colour (ISO 32) | Oxygen | White | Nitrous Oxide | Blue | Medical Air | Black and white shoulder | Carbon Dioxide | Grey

Source: <https://actisshealthcare.com/medical-gas-pipeline-colour-code>

standard: ISO 32


body:
**Gas:** Helium

**Standard:** ISO 32

**Body color:** Brown

> Gas | Cylinder Body Colour (ISO 32) | Oxygen | White | Nitrous Oxide | Blue | Medical Air | Black and white shoulder | Carbon Dioxide | Grey | Helium | Brown

Source: <https://actisshealthcare.com/medical-gas-pipeline-colour-code>


body:
**Gas:** Medical Air

**Standard:** ISO 32

**Shoulder color:** Black and white shoulder

> Gas | Cylinder Body Colour (ISO 32) | Oxygen | White | Nitrous Oxide | Blue | Medical Air | Black and white shoulder

Source: <https://actisshealthcare.com/medical-gas-pipeline-colour-code>

gas: Medical Air

shoulder_color: Black and white shoulder

title: Medical Air — Gas cylinder color codes by standard and country


body:
**Gas:** Nitrous Oxide

**Standard:** ISO 32

**Body color:** Blue

> Gas | Cylinder Body Colour (ISO 32) | Oxygen | White | Nitrous Oxide | Blue

Source: <https://actisshealthcare.com/medical-gas-pipeline-colour-code>

body_color: Blue

gas: Nitrous Oxide

title: Nitrous Oxide — Gas cylinder color codes by standard and country


body:
**Gas:** Oxygen/Helium Mixture

**Standard:** ISO 32

**Body color:** White and brown

> Gas | Cylinder Body Colour (ISO 32) | Oxygen | White | Nitrous Oxide | Blue | Medical Air | Black and white shoulder | Carbon Dioxide | Grey | Helium | Brown | Oxygen/Helium Mixture | White and brown

Source: <https://actisshealthcare.com/medical-gas-pipeline-colour-code>

body_color: White and brown

gas: Oxygen/Helium Mixture

title: Oxygen/Helium Mixture — Gas cylinder color codes by standard and country


body:
**Gas:** Oxygen/Nitrous Oxide Mixture

**Standard:** ISO 32

**Body color:** White and blue

> Gas | Cylinder Body Colour (ISO 32) | Oxygen | White | Nitrous Oxide | Blue | Medical Air | Black and white shoulder | Carbon Dioxide | Grey | Helium | Brown | Oxygen/Helium Mixture | White and brown | Oxygen/Nitrous Oxide Mixture | White and blue

Source: <https://actisshealthcare.com/medical-gas-pipeline-colour-code>

body_color: White and blue

gas: Oxygen/Nitrous Oxide Mixture

title: Oxygen/Nitrous Oxide Mixture — Gas cylinder color codes by standard and country


body:
**Gas:** Oxygen

**Standard:** ISO 32

**Body color:** White

> Gas | Cylinder Body Colour (ISO 32) | Oxygen | White

Source: <https://actisshealthcare.com/medical-gas-pipeline-colour-code>

body_color: White


body:
**Gas:** Oxygen

**Standard:** Thailand

**Body color:** emerald green

> Thailand, for example, uses emerald green for oxygen cylinders

Source: <https://actisshealthcare.com/medical-gas-pipeline-colour-code>

body_color: emerald green

standard: Thailand


body:
**Gas:** Oxygen

**Standard:** UK older convention (pre BS EN 1089-3)

**Shoulder color:** white

**Body color:** black

> the older UK convention used black bodies with white shoulders for oxygen before shifting fully to white bodies under BS EN 1089-3

Source: <https://actisshealthcare.com/medical-gas-pipeline-colour-code>

body_color: black

shoulder_color: white

standard: UK older convention (pre BS EN 1089-3)