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| Category | Details |
|---|---|
| Composition | – Nitrogen (N₂): Balance gas (typically 70–95% by volume) |
| – Carbon Dioxide (CO₂): 1–20% (inert, greenhouse gas) | |
| – Helium (He): 1–10% (non-flammable, cryogenic cooling agent) | |
| Key Applications | – Food & Beverage: Modified atmosphere packaging (MAP) and carbonation |
| – Fire Suppression: Inerting hazardous environments (CO₂ displaces oxygen) | |
| – Cryogenics: Cooling superconducting magnets (He) and freezing biological samples | |
| – Welding: Shielding gas mixtures (He for aluminum, CO₂ for steel) | |
| – Plant Growth: Elevated CO₂ levels in greenhouses | |
| Physical Properties | – CO₂: Liquifies at 5.2 bar (31°C); dense, odorless gas |
| – He: Lightest gas (0.1785 g/L); remains gaseous at -269°C | |
| – N₂: Inert buffer; prevents oxidation | |
| Safety Precautions | – Asphyxiation: High CO₂/N₂ levels displace oxygen; monitor O₂ sensors |
| – Cryogenic Risk: Liquid He requires insulated gloves and goggles | |
| – Pressure Hazards: Cylinders store gas at 150–200 bar; use regulators | |
| – Confined Spaces: Ventilate areas to prevent CO₂ buildup | |
| Storage & Handling | – High-pressure cylinders (e.g., 50L, 100L) with CGA/DIN valves |
| – Store upright in cool, well-ventilated areas away from flammables | |
| – Liquid CO₂/He in Dewar flasks (vacuum-insulated) | |
| Certifications | Compliance with ISO 7291 (gaseous CO₂), ASTM D7673 (He purity), and FDA/USDA regulations for food use |
| Environmental Impact | – CO₂: Major greenhouse gas (GWP 1); contributes to climate change |
| – He: Non-renewable resource; prioritize recycling in MRI/NMR systems | |
| Shelf Life | 12–24 months when stored at 15–25°C (avoid temperature fluctuations) |
| Special Notes | – Mixture Stability: CO₂ may adsorb on cylinder walls; purging required for accuracy |
| – Leak Detection: Use soapy water or electronic sniffers (avoid open flames) |
Declaration: The products displayed on this website are intended exclusively for industrial applications or scientific research. They are not intended for medical, pharmaceutical, or food use. In accordance with applicable laws and regulations, purchasing organizations must hold valid qualifications and approvals.
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