RawSource

Key takeaways Seventeen grades across 11 chemistries carry an RS code, INCI, stated content, pH with its basis and a TDS download, with CAS and packaging wherever the TDS states them: sulfates, ether sulfates, a sulfosuccinate and a soap (anionic), a betaine, a sultaine and an amine oxide (amphoteric), a C9-11 alcohol ethoxylate (nonionic) and cocamide DEA (alkanolamide). Sodi...

Key takeaways At 49%, hydrofluoric acid falls under the not-more-than-60-percent entries of 49 CFR 172.101 and RID Table A, the only band in either rule set that carries an IBC instruction (IB2 in the US, IBC02 in RID, covering the same metal, rigid plastic and composite IBC types). Special provision B15 requires bulk packagings to have a non-metallic lining impervious to the ...

Key takeaways SEMI C28, the Specification and Guide for Hydrofluoric Acid, is listed at revision C28-0618 as Inactive yet valid for use, so a SEMI grade claim on 49% HF should name the document and the edition. SEMI C10 says every relevant trace contaminant in a SEMI process-chemical standard should have a method detection limit equal to or less than its specification. A parts...

Key takeaways EPA’s 1993 Hydrogen Fluoride Study found that the ultra-high-purity hydrofluoric acid used in chip making is typically bought at 49 percent and used at 1 to 10 percent, so the real choice is the diluent: water alone, or water plus ammonium fluoride. Diluted HF handles oxide strips and HF dips, and once diluted past 3:1 it no longer lifts photoresist; 49% acid ten...

Key takeaways Copper in hydrofluoric acid deposits on bare silicon. A 1994 Materials Research Society study found copper deposition linear with concentration up to 500 ppb and absent on oxide, with tin, silver and molybdenum interacting in mixtures; a 1998 study found illumination raised copper deposition by nearly an order of magnitude. EPA’s 1993 hydrogen fluoride study says...