{
 "license": "CC BY 4.0 — Tremon Solutions, https://www.tremon.nl/gases/r125",
 "generated": "2026-09-17",
 "key": "r125",
 "name": "HFC-125 (Pentafluoroethane)",
 "formula": "C₂HF₅",
 "formula_plain": "C2HF5",
 "iupac": "1,1,1,2,2-pentafluoroethane",
 "synonyms": [],
 "cas": "354-33-6",
 "ec_number": "206-557-8",
 "un_number": "3220",
 "un_shipping_name": "Pentafluoroethane",
 "transport_class": "2.2 (Non-flammable, non-toxic gases)",
 "pubchem_cid": 9633,
 "molar_mass_g_mol": 120.02,
 "mg_m3_per_ppm_20c": 4.99,
 "boiling_point_c": -48.1,
 "sublimation_point_c": null,
 "melting_point_c": -103.0,
 "critical_temp_c": 66.2,
 "critical_pressure_bar": 36.3,
 "vapour_pressure_bar": 12.7,
 "vapour_pressure_at_c": 25.0,
 "density_gas_kg_m3": 4.99,
 "density_condition": "20 °C, 1 bar (ideal gas, M/24.04)",
 "relative_density_air": 1.21,
 "solubility_water": "430 mg/l at 25 °C",
 "appearance": "compressed gas, colourless, faint ethereal odour",
 "odour": "faint ethereal odour",
 "chemical_character": [
  "Non-combustible gas.",
  "Only slightly soluble in water.",
  "Gas is heavier than air."
 ],
 "hazard_class": "asphyxiant; greenhouse gas (F-gas Annex I)",
 "ghs_classification": [
  "Gases under pressure, compressed gas; H280"
 ],
 "ghs_signal_word": "Warning",
 "ghs_hazard_statements": [
  "H280: Contains gas under pressure; may explode if heated."
 ],
 "euh_statements": [],
 "nfpa704": {
  "health": 1,
  "flammability": 0,
  "instability": 0,
  "special": null
 },
 "lel_vol_pct": null,
 "uel_vol_pct": null,
 "autoignition_c": null,
 "temperature_class": null,
 "explosion_group": null,
 "eu_ioelv": {
  "twa_8h_ppm": null,
  "twa_8h_mg_m3": null,
  "stel_15min_ppm": null,
  "stel_15min_mg_m3": null,
  "directive": null
 },
 "de_agw": {
  "twa_ppm": null,
  "twa_mg_m3": null,
  "source": "TRGS 900 via GESTIS"
 },
 "nl_grenswaarde": {
  "note": "Netherlands: wettelijke grenswaarden (Arboregeling, bijlage XIII) — check the SER grenswaarden database (https://www.ser.nl/nl/thema/arbeidsomstandigheden/grenswaarden) for the current legal value; EU IOELVs are transposed into it."
 },
 "niosh_rel": {
  "twa_ppm": null,
  "stel_or_ceiling_ppm": null,
  "raw": null
 },
 "osha_pel": null,
 "idlh_ppm": null,
 "idlh_raw": null,
 "gwp100": {
  "ar4": 3500,
  "ar6": 3740,
  "eu_fgas_2024_573_annex": 3500
 },
 "atmospheric_lifetime_years": 30,
 "odp": 0,
 "gwp_note": null,
 "seveso_named": false,
 "health_effects": "Low toxicity, asphyxiant; cardiac sensitisation at high %. Decomposes in flames to HF/COF₂. Heavier than air.",
 "main_toxic_effects_gestis": null,
 "routes_of_exposure": null,
 "ir_absorption_band_um": "8.5–9.0 µm (C–F stretch); 7.0–9.5 µm region",
 "monitoring": [
  "NDIR (8.5–9 µm) refrigerant leak monitoring; component of R-410A/R-404A/R-407C blends — F-gas leak-check obligations apply per Reg. 2024/573 Art. 4/5.",
  "Alarm 500–1000 ppm in machine rooms; floor-level sampling."
 ],
 "regulation_windows": [
  "F-gas 2024/573 Annex I (GWP 3500) — component of R-410A/R-404A; leak-check and leak-detection obligations",
  "EN 378"
 ],
 "tremon_products": [
  "IR·SF₆/refrigerant transmitter (R-125 range)",
  "IR·OEM channel"
 ],
 "sources": [
  "https://gestis-database.dguv.de/data?name=103348",
  "https://pubchem.ncbi.nlm.nih.gov/compound/9633",
  "IPCC AR6 WG1 Ch.7 Supplementary Material, Table 7.SM.7 (https://www.ipcc.ch/report/ar6/wg1/downloads/report/IPCC_AR6_WGI_Chapter07_SM.pdf)",
  "IPCC AR4 WG1 Ch.2, Table 2.14 (https://www.ipcc.ch/site/assets/uploads/2018/02/ar4-wg1-chapter2-1.pdf)",
  "Regulation (EU) 2024/573, Annex I/III (https://eur-lex.europa.eu/eli/reg/2024/573/oj)",
  "HITRAN/NIST IR band positions (approximate centre of the strongest band used for NDIR; https://hitran.org, https://webbook.nist.gov)",
  "PubChem CID 9633 (HSDB: vapour pressure 9501 mmHg at 25 °C); critical point 66.1 °C / 36.29 bar per NIST Chemistry WebBook (https://webbook.nist.gov/cgi/cbook.cgi?ID=C354336&Mask=4)"
 ]
}