Buying flotation reagents is not like buying commodity chemicals. The specification sheet, the quality consistency and the supplier’s documentation all directly affect your flotation performance — and your recovery rate is money. This guide walks through everything a procurement or mill manager should check when buying SIBX (sodium isobutyl xanthate, CAS 25306-75-6).
1. Understanding the SIBX Specification Sheet
A standard SIBX specification for flotation use typically includes the following key parameters:
| Parameter | Typical value | What it means |
|---|---|---|
| Activity (active xanthate content) | 90% min | Higher activity = more collecting power per kilo; the key value parameter. |
| Free alkali | 0.2% max | Excess alkali can affect pulp pH control; low free alkali is preferred. |
| Appearance | Light yellow to yellowish-green powder or granular | Color and form consistency indicate quality control. |
| Solubility | Soluble in water | Must dissolve readily for effective conditioning. |
Always ask the supplier for the exact activity value on each batch, not just “90% min”. Batch-to-batch consistency is what protects your dosage control.
2. What a Reliable COA Should Contain
A complete Certificate of Analysis (COA) for SIBX should include:
- Product name and CAS number (25306-75-6)
- Batch number and production date
- Assay/activity (measured value, not only minimum)
- Free alkali (measured value)
- Moisture content
- Physical state and appearance
- Test methods used (standard analytical methods)
- Signature and date of the quality department
3. Packaging, Storage and Shelf Life
- Packaging: SIBX is normally supplied in sealed bags or drums (e.g. 25 kg bags or 50 kg drums; confirm exact packaging with the supplier).
- Storage: Keep containers tightly sealed in a cool, dry, well-ventilated area, away from acids, oxidizers and sources of ignition. Xanthates decompose on contact with moisture and acids.
- Shelf life: Use within the manufacturer’s stated shelf life (typically 6-12 months for xanthates); buy in quantities that match your consumption rate.
4. MOQ, Lead Time and Logistics
Before ordering, confirm with the supplier:
- MOQ: Typical MOQs for SIBX range from small trial lots to full container loads — ask for the MOQ that fits your trial and production plan.
- Lead time: Confirm production lead time plus shipping time to your port.
- Documentation: For international shipments you will need commercial invoice, packing list, COA, MSDS and, where applicable, a certificate of origin. Check the applicable HS code (organo-sulfur compounds) with your forwarder.
- Shipping: Xanthates are regulated as dangerous goods in some transport modes — your freight forwarder must be advised of the UN classification and proper shipping name in advance.
5. How to Verify Quality on Arrival
- Inspect packaging integrity — damaged or wet bags indicate possible decomposition.
- Check that the COA batch number matches the label batch number.
- Take a representative sample and compare color, odor and solubility against your standard.
- If possible, run a small flotation test with the new batch before using it in production.
- Keep a retained sample for each received batch for at least one production cycle.
6. Choosing a Supplier: Checklist
- Manufacturer vs trader — manufacturers can control quality and price better.
- Stable supply — can they guarantee consistent monthly volume?
- Documentation quality — COA, MSDS and export documents issued reliably.
- Responsiveness — how fast do they answer technical and logistical questions?
- References — have they supplied mining companies or reagent distributors before?
7. FAQ
What is the difference between activity and purity for SIBX?
For xanthates, “activity” refers to the active xanthate salt content (the effective collector), which is the parameter that matters for flotation performance. Purity is related but the activity value is what you should compare between suppliers.
What MOQ does a new buyer usually need?
That depends on your trial scale. Many suppliers offer trial quantities for lab or pilot testing before committing to bulk orders — ask PolyblueChem for a trial-sized quotation.
Is SIBX cheaper than other xanthates?
SIBX typically costs slightly more than SIPX but less than PAX. Its better selectivity and stability can reduce total reagent cost per ton of concentrate.
Can you supply SIBX with custom packaging?
Custom packaging is generally possible on bulk orders; discuss your packaging requirements with the supplier before ordering.
For the technical background on SIBX mechanism and applications, see our in-depth guide: SIBX in Mining: Mechanism, Application Methods and Case Studies.
PolyblueChem is a China-based supplier of SIBX (sodium isobutyl xanthate, CAS 25306-75-6), supplying activity ≥ 90%, free alkali ≤ 0.2%, with COA and MSDS for every shipment. Request a quote through our contact page.