{
  "name": "Gas cylinder color codes by standard and country",
  "description": "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) \u2014 a safety-critical difference that assistants routinely get wrong by stating one standard as universal.",
  "url": "https://referencesource.org/gas-cylinder-color-codes/",
  "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.",
  "last_verified": "2026-08-05",
  "stale_after": "2028-08-04",
  "sources": [
    "https://www.webofpharma.com/2025/12/gas-cylinder-color-coding.html",
    "https://www.pharmaguideline.com/2014/01/olor-codes-for-gas-cylinders-in-pharma.html",
    "https://actisshealthcare.com/medical-gas-pipeline-colour-code"
  ],
  "records": [
    {
      "gas": "Air",
      "standard": "BIS IS 3933 (India)",
      "shoulder_color": "Grey",
      "body_color": "Grey",
      "id": "bis-is-3933-india-air",
      "url": "https://referencesource.org/gas-cylinder-color-codes/bis-is-3933-india-air/",
      "source": "https://www.pharmaguideline.com/2014/01/olor-codes-for-gas-cylinders-in-pharma.html",
      "source_quote": "S. No. | Gas Cylinder | Color | Shoulder | Body | 1. | Air | Grey | Grey"
    },
    {
      "gas": "Ammonia",
      "standard": "BIS IS 3933 (India)",
      "shoulder_color": "Red",
      "body_color": "Yellow & Black",
      "id": "bis-is-3933-india-ammonia",
      "url": "https://referencesource.org/gas-cylinder-color-codes/bis-is-3933-india-ammonia/",
      "source": "https://www.pharmaguideline.com/2014/01/olor-codes-for-gas-cylinders-in-pharma.html",
      "source_quote": "S. No. | Gas Cylinder | Color | Shoulder | Body | 1. | Air | Grey | Grey | 2. | Ammonia | Red | Yellow & Black"
    },
    {
      "gas": "Carbon Dioxide",
      "standard": "BIS IS 3933 (India)",
      "shoulder_color": "Silver",
      "body_color": "Black",
      "id": "bis-is-3933-india-carbon-dioxide",
      "url": "https://referencesource.org/gas-cylinder-color-codes/bis-is-3933-india-carbon-dioxide/",
      "source": "https://www.pharmaguideline.com/2014/01/olor-codes-for-gas-cylinders-in-pharma.html",
      "source_quote": "S. No. | Gas Cylinder | Color | Shoulder | Body | 1. | Air | Grey | Grey | 2. | Ammonia | Red | Yellow & Black | 3. | Carbon Dioxide | Silver | Black"
    },
    {
      "gas": "Chlorine",
      "standard": "BIS IS 3933 (India)",
      "shoulder_color": "Yellow",
      "body_color": "Yellow",
      "id": "bis-is-3933-india-chlorine",
      "url": "https://referencesource.org/gas-cylinder-color-codes/bis-is-3933-india-chlorine/",
      "source": "https://www.pharmaguideline.com/2014/01/olor-codes-for-gas-cylinders-in-pharma.html",
      "source_quote": "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"
    },
    {
      "gas": "Helium",
      "standard": "BIS IS 3933 (India)",
      "shoulder_color": "Brown",
      "body_color": "Brown",
      "id": "bis-is-3933-india-helium",
      "url": "https://referencesource.org/gas-cylinder-color-codes/bis-is-3933-india-helium/",
      "source": "https://www.pharmaguideline.com/2014/01/olor-codes-for-gas-cylinders-in-pharma.html",
      "source_quote": "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"
    },
    {
      "gas": "Hydrogen",
      "standard": "BIS IS 3933 (India)",
      "shoulder_color": "Red",
      "body_color": "Red",
      "id": "bis-is-3933-india-hydrogen",
      "url": "https://referencesource.org/gas-cylinder-color-codes/bis-is-3933-india-hydrogen/",
      "source": "https://www.pharmaguideline.com/2014/01/olor-codes-for-gas-cylinders-in-pharma.html",
      "source_quote": "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"
    },
    {
      "gas": "Nitrogen",
      "standard": "BIS IS 3933 (India)",
      "shoulder_color": "Black",
      "body_color": "Grey",
      "id": "bis-is-3933-india-nitrogen",
      "url": "https://referencesource.org/gas-cylinder-color-codes/bis-is-3933-india-nitrogen/",
      "source": "https://www.pharmaguideline.com/2014/01/olor-codes-for-gas-cylinders-in-pharma.html",
      "source_quote": "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"
    },
    {
      "gas": "Oxygen",
      "standard": "BIS IS 3933 (India)",
      "shoulder_color": "White",
      "body_color": "Black",
      "id": "bis-is-3933-india-oxygen",
      "url": "https://referencesource.org/gas-cylinder-color-codes/bis-is-3933-india-oxygen/",
      "source": "https://www.pharmaguideline.com/2014/01/olor-codes-for-gas-cylinders-in-pharma.html",
      "source_quote": "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"
    },
    {
      "gas": "Carbon Dioxide",
      "standard": "ISO 32",
      "body_color": "Grey",
      "id": "iso-32-carbon-dioxide",
      "url": "https://referencesource.org/gas-cylinder-color-codes/iso-32-carbon-dioxide/",
      "source": "https://actisshealthcare.com/medical-gas-pipeline-colour-code",
      "source_quote": "Gas | Cylinder Body Colour (ISO 32) | Oxygen | White | Nitrous Oxide | Blue | Medical Air | Black and white shoulder | Carbon Dioxide | Grey"
    },
    {
      "gas": "Helium",
      "standard": "ISO 32",
      "body_color": "Brown",
      "id": "iso-32-helium",
      "url": "https://referencesource.org/gas-cylinder-color-codes/iso-32-helium/",
      "source": "https://actisshealthcare.com/medical-gas-pipeline-colour-code",
      "source_quote": "Gas | Cylinder Body Colour (ISO 32) | Oxygen | White | Nitrous Oxide | Blue | Medical Air | Black and white shoulder | Carbon Dioxide | Grey | Helium | Brown"
    },
    {
      "gas": "Medical Air",
      "standard": "ISO 32",
      "shoulder_color": "Black and white shoulder",
      "id": "iso-32-medical-air",
      "url": "https://referencesource.org/gas-cylinder-color-codes/iso-32-medical-air/",
      "source": "https://actisshealthcare.com/medical-gas-pipeline-colour-code",
      "source_quote": "Gas | Cylinder Body Colour (ISO 32) | Oxygen | White | Nitrous Oxide | Blue | Medical Air | Black and white shoulder"
    },
    {
      "gas": "Nitrous Oxide",
      "standard": "ISO 32",
      "body_color": "Blue",
      "id": "iso-32-nitrous-oxide",
      "url": "https://referencesource.org/gas-cylinder-color-codes/iso-32-nitrous-oxide/",
      "source": "https://actisshealthcare.com/medical-gas-pipeline-colour-code",
      "source_quote": "Gas | Cylinder Body Colour (ISO 32) | Oxygen | White | Nitrous Oxide | Blue"
    },
    {
      "gas": "Oxygen",
      "standard": "ISO 32",
      "body_color": "White",
      "id": "iso-32-oxygen",
      "url": "https://referencesource.org/gas-cylinder-color-codes/iso-32-oxygen/",
      "source": "https://actisshealthcare.com/medical-gas-pipeline-colour-code",
      "source_quote": "Gas | Cylinder Body Colour (ISO 32) | Oxygen | White"
    },
    {
      "gas": "Oxygen/Helium Mixture",
      "standard": "ISO 32",
      "body_color": "White and brown",
      "id": "iso-32-oxygen-helium-mixture",
      "url": "https://referencesource.org/gas-cylinder-color-codes/iso-32-oxygen-helium-mixture/",
      "source": "https://actisshealthcare.com/medical-gas-pipeline-colour-code",
      "source_quote": "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"
    },
    {
      "gas": "Oxygen/Nitrous Oxide Mixture",
      "standard": "ISO 32",
      "body_color": "White and blue",
      "id": "iso-32-oxygen-nitrous-oxide-mixture",
      "url": "https://referencesource.org/gas-cylinder-color-codes/iso-32-oxygen-nitrous-oxide-mixture/",
      "source": "https://actisshealthcare.com/medical-gas-pipeline-colour-code",
      "source_quote": "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"
    },
    {
      "gas": "Oxygen",
      "standard": "Thailand",
      "body_color": "emerald green",
      "id": "thailand-oxygen",
      "url": "https://referencesource.org/gas-cylinder-color-codes/thailand-oxygen/",
      "source": "https://actisshealthcare.com/medical-gas-pipeline-colour-code",
      "source_quote": "Thailand, for example, uses emerald green for oxygen cylinders"
    },
    {
      "gas": "Oxygen",
      "standard": "UK older convention (pre BS EN 1089-3)",
      "shoulder_color": "white",
      "body_color": "black",
      "id": "uk-older-convention-pre-bs-en-1089-3-oxygen",
      "url": "https://referencesource.org/gas-cylinder-color-codes/uk-older-convention-pre-bs-en-1089-3-oxygen/",
      "source": "https://actisshealthcare.com/medical-gas-pipeline-colour-code",
      "source_quote": "the older UK convention used black bodies with white shoulders for oxygen before shifting fully to white bodies under BS EN 1089-3"
    }
  ]
}