Chloroiridic acid (hydrate)
CAS 110802-84-1
Chloroiridic acid is the primary soluble iridium source — the precursor from which PEM electrolyzer anode coatings, DSA-type mixed-metal-oxide electrodes and supported iridium catalysts are manufactured.
Typical specification
| Molecular formula | H₂IrCl₆ · xH₂O |
|---|---|
| Molecular weight | 406.93 (anhydrous basis) |
| Purity (metals basis) | ≥ 99.9% |
| Iridium content | ≥ 39% (certified per lot) |
| Forms | Crystals or solution at specified Ir g/L |
| Base metals | ICP report per lot |
| HS code (export) | 2843900099 |
Lot-specific COA issued with every shipment. SDS and ICP elemental impurity data available on request.
Where H₂IrCl₆·xH₂O is used
Electrolyzer and electrode coating manufacture
The standard precursor for thermally decomposed IrO₂-based coatings on titanium — PEM water-electrolysis anodes and mixed-oxide industrial electrodes — where solution assay consistency drives coating reproducibility.
Supported iridium catalyst preparation
Feeds Ir/C and Ir/Al₂O₃ impregnation for hydrogenation and specialty catalysis where an aqueous, fully chlorinated Ir(IV) species is required.
Storage and shipping
Storage. Store tightly sealed; strongly hygroscopic and corrosive.
Shipping. Corrosive (Class 8) classification applies; shipped in UN-approved packaging with DG documentation.
Packaging. 5 g · 25 g · 100 g · Solution grades by contained Ir weight
Synonyms
- Hexachloroiridic acid
- Dihydrogen hexachloroiridate
- H2IrCl6
- Iridium chloride acid solution
Frequently asked questions
How is pricing structured?
Iridium is among the scarcest PGMs with sharply moving prices, so the metal leg is quoted against the day's Ir price on assayed content and locked at order confirmation; conversion is a stated fabrication charge.
Crystals or solution for coating lines?
Coating plants take solution at certified Ir g/L for direct formulation; crystals store longer and suit intermittent users. Both settle on assayed contained iridium.
Do you take back iridium residues?
Yes — at iridium's price level recovery is almost always worthwhile. Residues, spent coatings and off-spec lots are assayed on receipt and the iridium credited against future supply.