SIBX (sodium isobutyl xanthate), CAS 25306-75-6, is a strong, general-purpose sulphide collector for copper, lead, zinc, nickel and gold flotation. PolyBlueChem supplies SIBX with per-batch COA and SDS and competitive pricing on bulk and scheduled volumes.
Specifications
| Property | Specification |
|---|---|
| Appearance | Pale-yellow to yellow solid / granules |
| Activity (assay) | 90% min |
| Free alkali | 0.2% max |
A full specification sheet and per-batch certificate of analysis are available on request. Activity and free alkali are the two parameters that matter most for xanthates.
Basic Information
| CAS number | 25306-75-6 |
| Chemical name | Sodium isobutyl xanthate (sodium O-isobutyl dithiocarbonate) |
| Chain length | C4 (isobutyl) |
| Type | Sulphide flotation collector |
Applications
- Copper – collector for chalcopyrite and copper sulphide ores.
- Lead-zinc – lead flotation with zinc depression; zinc flotation after activation.
- Gold – flotation of gold-bearing sulphides.
- Nickel – bulk nickel sulphide flotation.
- Polymetallic ores – collector within staged reagent schemes.
Packaging, storage and documentation
- Moisture-barrier PP/PE bags with inner liner, drums, or jumbo bags.
- Per-batch certificate of analysis (COA) and safety data sheet (SDS).
- Store sealed, cool and dry – xanthates decompose with moisture, heat and time, so buy to consumption and rotate stock.
PolyBlueChem supplies SIBX (CAS 25306-75-6) and the full xanthate range (SIPX, PAX, SEX) with per-batch COA and SDS and FOB/CIF delivery to African mines and worldwide. Contact us with your ore, consumption and delivery port for a quotation.


