{ "license": "CC BY 4.0 — Tremon Solutions, https://www.tremon.nl/gases/so2f2", "generated": "2026-09-17", "key": "so2f2", "name": "Sulfuryl fluoride", "formula": "SO₂F₂", "formula_plain": "F2O2S", "iupac": "sulfuryl difluoride", "synonyms": [ "Sulfur difluoride dioxide", "Vikane®" ], "cas": "2699-79-8", "ec_number": "220-281-5", "un_number": "2191", "un_shipping_name": "Sulphuryl fluoride", "transport_class": "2.3 (Toxic gases)", "pubchem_cid": 17607, "molar_mass_g_mol": 102.06, "mg_m3_per_ppm_20c": 4.24, "boiling_point_c": -55.4, "sublimation_point_c": null, "melting_point_c": -135.8, "critical_temp_c": 91.8, "critical_pressure_bar": null, "vapour_pressure_bar": 17.0, "vapour_pressure_at_c": 21.1, "density_gas_kg_m3": 4.6261, "density_condition": "0 °C, 1013 mbar", "relative_density_air": 3.47, "solubility_water": "Concentration: 2 g/l", "appearance": "gas liquefied under pressure, colourless, odourless", "odour": "odourless", "chemical_character": [ "Non-combustible gas.", "Moderately soluble in water.", "Gas is heavier than air.", "Acute or chronic health hazards result from the substance.", "The substance is hazardous to the aquatic environment.", "(see: chapter REGULATIONS)." ], "hazard_class": "toxic (fumigant; delayed CNS/respiratory effects)", "ghs_classification": [ "Gases under pressure, liquefied gas; H280", "Acute toxicity, Category 3, inhalation; H331", "Specific Target Organ Toxicity (repeated exposure), Category 2; H373", "Hazardous to the aquatic environment, Acute Category 1; H400" ], "ghs_signal_word": "Danger", "ghs_hazard_statements": [ "H280: Contains gas under pressure; may explode if heated.", "H331: Toxic if inhaled.", "H373: May cause damage to organs through prolonged or repeated exposure.", "H400: Very toxic to aquatic life." ], "euh_statements": [], "nfpa704": { "health": 3, "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": 5.0, "stel_or_ceiling_ppm": 10.0, "raw": "TWA 5 ppm (20 mg/m3) ST 10 ppm (40 mg/m3)" }, "osha_pel": "TWA 5 ppm (20 mg/m3) See Appendix G", "idlh_ppm": 200.0, "idlh_raw": "200 ppm", "gwp100": { "ar4": null, "ar6": 4630, "eu_fgas_2024_573_annex": null }, "atmospheric_lifetime_years": 36, "odp": 0, "gwp_note": "Not an F-gas under 2024/573 despite high GWP; it is a fumigant regulated under biocides/plant-protection law.", "seveso_named": true, "health_effects": "Fumigant with no odour warning. Acute exposure irritates lungs (delayed pulmonary oedema); high doses cause CNS effects — nausea, seizures, coma. Chronic exposure risk to kidneys. NIOSH REL 5 ppm TWA, IDLH 200 ppm.", "main_toxic_effects_gestis": "Acute effects: \nDisorders of the general well-being, effects on the CNS, possibly lung damage;\nChronic effects: \nInformation relevant to humans is not available.", "routes_of_exposure": "Main routes of exposure\nThe main route of exposure for sulphuryl fluoride (SF) is via the respiratory tract.\nRespiratory tract\nExposure to the gases (certainly less to the liquefied substance) can occur during chemical reactions and in special cases during the application of the substance as a pesticide.\nDue to the high stability of the molecule normal conditions are hardly expected to involve a combined exposure to SF and sulphur oxides as well as to hydrogen fluoride, whose formation would be expected in theory.\nKinetic studies on the resorbability are not available.\nHowever, systemic effects observed in animal experiments and experiences with one toxicity case indicate that the substance is resorbed via the respiratory tract, probably as an intact molecule.\nSkin\nAbsorption of the gas via the skin is considered to be possible.\nHowever, the portions absorbed by the skin for anyone spending a period of time in a contaminated atmosphere would be quite minor in comparison to the amount assimilated by inhalation.\nThe contact with liquefied SF was implied to involve a risk of frostbite, but no resorption of dermally toxic amounts.\nGastrointestinal tract\nInformation relevant to humans is not available.\nConsidering the physical-chemical characteristics of SF this route of exposure is hardly relevant to practice.\nHowever, relatively low LD50 values (no information on the mode of application) point to rapid resorption via the gastrointestinal tract of test animals.", "ir_absorption_band_um": "7.2 µm (S=O stretch, ≈1390 cm⁻¹); 8.8 µm; 11.4 µm (S–F)", "monitoring": [ "NDIR (≈7.2/8.8 µm) is the method of choice for fumigation clearance and structural fumigation monitoring; PID cannot see it; EC cells are not selective.", "Limits: 5 ppm 8-h TWA (NIOSH/OSHA), 10 ppm STEL; re-entry clearance typically ≤1 ppm." ], "regulation_windows": [ "Biocidal Products Regulation 528/2012 / fumigation permits — clearance measurement before re-entry", "Workplace: NIOSH/OSHA 5 ppm TWA, 10 ppm STEL; GWP 4630 (AR6)" ], "tremon_products": [ "IR·OEM SO₂F₂ channel", "TRM-PGA" ], "sources": [ "https://gestis-database.dguv.de/data?name=500105", "https://www.cdc.gov/niosh/npg/npgd0581.html", "https://pubchem.ncbi.nlm.nih.gov/compound/17607", "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)", "HITRAN/NIST IR band positions (approximate centre of the strongest band used for NDIR; https://hitran.org, https://webbook.nist.gov)", "PubChem CID 17607 (ICSC: 1700 kPa at 21.1 °C); critical pressure not verified — left null" ] }