CAS 7664-39-3 · K-REACH · Republic of Korea

Hydrofluoric acid (HF) under K-REACH

HF · 氢氟酸

Status: Registered. Hydrofluoric acid is registered under K-REACH. **On Korea TCCA Toxic Chemicals list** (verify against the current TCCA Toxic Chemicals list at https://www.nics.go.kr/ and NICS toxic-chemical database before relying; HF's Acute Tox. 1 + Skin Corr. 1A profile triggers TCCA scheduling). NOT on Korean Drug Management Act precursor list. NO active Korean AD/CVD case on Chinese-origin HF currently (verify against https://www.kita.org/ or Korea Trade Commission filings before invoicing). Korea has substantial domestic HF demand for **semiconductor etching + photoresist developer at Samsung + SK Hynix + LG semiconductor fabs** plus fluorochem refrigerant manufacturing; structurally net-importer with significant Chinese-origin import dependency. KCFTA preferential zero-duty applies for Chinese-origin imports. **Note: 2012 Hube Global HF leak in Gumi (5 deaths, 18 hospitalised) is the iconic Korean industrial-safety incident driving heightened HF regulatory scrutiny since (verify historical context against Korean Ministry of Environment + Korea Industrial Health Association archives before relying on specifics)**.

K-REACH treats HF as a **TCCA Toxic Chemicals scheduled substance** (TCCA Handling Permit at destination facility). Korea structurally net-importer with significant Chinese-origin dependency for semiconductor etching at Samsung + SK Hynix + LG. NO active Korean AD/CVD case. **Heightened Korean HF regulatory scrutiny since 2012 Hube Global Gumi HF leak (verify casualty figures and date against Korean Ministry of Environment + Korea Industrial Health Association archives before relying on specifics)**. **HF distinguishing pattern across all 5 regimes**: Production via fluorspar (CaF2) + H2SO4 batch 2 yielding HF + CaSO4 gypsum at ~250 C + fluorochem chain feedstock for aluminium-smelter cryolite (Na3AlF6) + AlF3 + HCFC / HFC / HFO refrigerants + PTFE / PVDF / FEP fluoropolymers + UF6 + semiconductor etching + oil-refining HF alkylation + pharmaceutical fluorinated APIs downstream chains + extreme hazard profile across regimes (Acute Tox. 1 oral / dermal / inhalation + Skin Corr. 1A; deep tissue penetration via Ca chelation; Ca-gluconate antidote at use sites) + IARC not classified + US OSHA PEL 3 ppm 8-hr TWA Table Z-2 + NIOSH REL 3 ppm TWA + 6 ppm ceiling + EPA RMP 1,000 lb + EPA CAA Section 112 HAP + HF itself NOT on Cal Prop 65 (certain fluoride salts NaF, SnF2 listed for developmental, verify against OEHHA) + historical US AD/CVD lane on Chinese aluminium fluoride flows into HF chain (verify current case number, scope and status against access.trade.gov before invoicing) + EU historical AD measures on Chinese AlF3 (verify current status against EUR-Lex) + China Catalog of Hazardous Chemicals AND Highly Toxic Chemicals + seasonal fluorspar export-quota + export-licensing + Australian SUSMP Schedule 7 + Korean TCCA Toxic Chemicals + 2012 Hube Global Gumi historical incident (verify casualty figures).