{
  "slug": "r-744",
  "displayName": "R-744",
  "altSpellings": [
    "R744",
    "CO2",
    "Carbon Dioxide"
  ],
  "chemicalName": "Carbon dioxide",
  "chemicalFormula": "CO2",
  "ashraeNumber": "R-744",
  "type": "natural",
  "safetyClass": "A1",
  "tradeNames": [],
  "composition": [],
  "physical": {
    "boilingPointC": null,
    "boilingPointF": null,
    "critical": {
      "tempC": 30.98,
      "tempF": 87.76,
      "pressurePsia": 1070,
      "pressurePsig": 1055.3,
      "pressureKpaA": 7377.3,
      "pressureKpaG": 7276
    },
    "molarMassGPerMol": 44.01,
    "liquidDensityKgPerM3At25C": null,
    "temperatureGlideF": 0,
    "hasSignificantGlide": false
  },
  "environmental": {
    "odp": 0,
    "gwp100Ar5": 1,
    "gwp100Ar6": 1,
    "atmosphericLifetimeYears": null,
    "snapStatus": "Listed acceptable broadly; the GWP=1 reference refrigerant"
  },
  "lubricants": {
    "compatible": [
      "POE",
      "PAG"
    ],
    "incompatible": [
      "MO"
    ],
    "notes": "Critical point at 31.0°C (87.8°F) — most commercial systems operate transcritically. Very high operating pressures (typically 60-130 bar). Specialty equipment, POE oil (specific CO2-rated formulations), and high-pressure components required."
  },
  "applications": [
    "Commercial refrigeration (supermarket booster and transcritical CO2 systems, expanding rapidly)",
    "Cascade refrigeration (CO2 low-stage)",
    "Heat pumps (water heating, with high COP at moderate ambient)",
    "Mobile AC (heat pumps, EU/Japan adoption)"
  ],
  "replacementOptions": [],
  "replaces": [
    "r-404a",
    "r-22"
  ],
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    "epaPhaseoutDate": null,
    "aimActAffected": false,
    "snapApproved": true
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