{"cas":"1310-73-2","name":"sodium hydroxide","synonyms":["SODIUM HYDROXIDE","1310-73-2","Caustic soda","Sodium hydrate","Aetznatron","Soda lye","White caustic","Soda, caustic","Natriumhydroxid","Rohrputz","Plung","Collo-Grillrein","Collo-Tapetta","Sodium hydroxide (Na(OH))","Fuers Rohr","Rohrreiniger Rofix","Hydroxyde de sodium","Natriumhydroxyde","Soda, hydrate","Sodium hydroxide dimer"],"cid":14798,"ghs":{"pictograms":["GHS05","GHS07","GHS08"],"signal":null,"classes":["Met. Corr. 1 (47.5%)","Skin Corr. 1A (> 99.9%)","Eye Dam. 1 (44.1%)","Eye Irrit. 2 (36.6%)","Met. Corr. 1 (100%)","Skin Corr. 1B (100%)","Eye Dam. 1 (100%)","Specific target organ toxicity (single exposure) - category 3","Skin corrosion - category 1A","Skin corrosion/irritation - Category 1","Serious eye damage/eye irritation - Category 1","Specific target organ toxicity - Single exposure - Category 1 (respiratory system)","Hazardous to the aquatic environment (Acute) - Category 3","Skin corrosion/irritation - Category 1A-1C","Corrosives, Reactive agents - 1st degree","Skin Corr. 1A"],"h_statements":["H314 Causes severe skin burns and eye damage","H290 (47.5%): May be corrosive to metals","H314 (> 99.9%): Causes severe skin burns and eye damage","H315 (36.5%): Causes skin irritation","H318 (44.1%): Causes serious eye damage","H319 (36.6%): Causes serious eye irritation","H290 (100%): May be corrosive to metals","H314 (100%): Causes severe skin burns and eye damage","H318 (100%): Causes serious eye damage","H318 Causes serious eye damage","H370 Causes damage to organs","H335 May cause respiratory irritation"],"p_statements":{}},"physical":{"appearance":"Sodium hydroxide solution appears as a colorless liquid. More dense than water. Contact may severely irritate skin, eyes, and mucous membranes. Toxic by ingestion. Corrosive to metals and tissue.","odour":"... Odorless ...","boiling_point":"greater than 266 °F at 760 mmHg (USCG, 1999)","melting_point":"604 °F (USCG, 1999)","water_solubility":"111 % (NIOSH, 2024)","density":"1.5 at 68 °F (USCG, 1999) - Denser than water; will sink","vapour_pressure":"0 mmHg (approx) (NIOSH, 2024)","autoignition_temperature":"Not flammable (USCG, 1999)"},"transport":{"un_number":null,"un_psn":null,"hazard_class":null,"packing_group":null},"exposure":{"osha_pel":"Vacated 1989 OSHA PEL Ceiling limit 2 mg/cu m is still enforced in some states.","niosh_rel":"Recommended Exposure Limit: 15 Minute Ceiling Value: 2 mg/cu m.","note":"Auto-sourced from PubChem. NZ WES must be confirmed against MBIE Workplace Exposure Standards table before use."},"first_aid":{"inhalation":"· Effects of exposure (inhalation, ingestion, or skin contact) to substance may be delayed.","skin":"SKIN: flush with water, then rinse with dilute vinegar (acetic acid).","eye":"EYES: flush with water at once for at least 15 min.","ingestion":"INGESTION: give water and milk. Do NOT induce vomiting. Call physician at once, even when injury seems to be slight. (USCG, 1999)"},"data_source":"pubchem","source_url":"https://pubchem.ncbi.nlm.nih.gov/compound/14798","fetched_at":"2026-06-06T08:31:29.644227+00:00","updated_at":"2026-06-06T08:31:29.644227+00:00","content_hash":"64aecbd412e3682d","ttl_days":180,"confidence":"medium","verified_by":""}