Phosphorus Pentasulfide | High Purity, Reliable Supply
Market notes, specs, and real-world use of phosphorus pentasulfide
If you’ve worked in lubricants, mining reagents, or next‑gen batteries, you’ve almost certainly crossed paths with phosphorus pentasulfide. It’s that yellow to greenish-yellow crystalline solid with a faint H2S-like odor—temperamental, yes, but indispensable. DF Chem Pest ships from Room 511, Zelong Building, No.195 Guanghua Road, Shijiazhuang, China 050000, and—speaking candidly—the company’s consistency has improved a lot in the last two years, judging from buyer chatter.
What it’s used for (and why it still matters)
- Lubricant additives: precursor to ZDDP antiwear packages; sulfurization of base oils.
- Mining chemicals: xanthate and dithiophosphate collectors for sulfide ore flotation.
- Agrochemical synthesis: organophosphorus intermediates (tight specs matter here).
- Solid-state batteries: Li–P–S glasses/electrolytes based on Li2S–phosphorus pentasulfide blends.
- Rubber/industrial chemicals: specialty sulfurization reactions.
Product specifications (typical, lot-to-lot may vary)
| Property | Typical Value | Method/Standard |
|---|---|---|
| Assay (P4S10) | ≥ 99.0% (≈) | Titrimetric/gravimetric, ISO 17025 lab |
| Free sulfur | ≤ 2.0% | GC or DSC screening |
| Moisture | ≤ 0.10% | Karl Fischer (ASTM E203) |
| Melting point | ≈ 280–290 °C | Thermal analysis (ASTM E794) |
| Density | ≈ 2.0–2.1 g/cm³ | Pycnometry |
Packaging: nitrogen-blanketed 25 kg or 50 kg steel drums, or 500–1,000 kg IBCs; shelf life ≈ 18–24 months unopened, cool/dry. Note: phosphorus pentasulfide reacts with moisture to release H2S—store accordingly.
How it’s made (quick process flow)
Raw materials: purified white phosphorus and sulfur. Method: controlled fusion/synthesis under inert gas, followed by refining (vacuum treatment or recrystallization), flaking/granulation, and anti-caking conditioning. QC: assay, free S, moisture (KF), trace metals (ICP‑OES), sieve analysis, and simulated hydrolysis test. Lots are released per internal specs aligned with ISO 9001; testing in accredited (ISO 17025) labs where applicable.
Vendor comparison (indicative)
| Vendor | Origin | Purity (≈) | Certs | Lead Time | Customization |
|---|---|---|---|---|---|
| DF Chem Pest | Shijiazhuang, China | 99.0–99.5% | ISO 9001, SDS (GHS) | 7–15 days | Particle size, low‑moisture |
| Regional Producer | EU | 98.5–99.0% | ISO 14001 | 2–4 weeks | Eco-pack, REACH |
| Global Trader | Multiple | 98–99% | CoA on request | Stock-dependent | Basic options |
To be honest, pricing has tightened with sulfur volatility and battery-materials demand; still, many customers say stable QC beats shaving a few dollars per drum.
Case snapshots and data
Lubricants: A gearbox-oil maker switched to tighter-moisture phosphorus pentasulfide and saw 12% lower wear scar (ASTM D4172, 40 kg, 75 °C) and better TAN stability over 168 h oxidation—small numbers, big field impact.
Battery R&D: University lab prepared Li2S–phosphorus pentasulfide glass (75:25 mol%) via ball milling; ionic conductivity reached ≈ 10−4 S·cm−1 at 25 °C (room conditions vary). They emphasized low free S to limit interfacial side reactions.
Customer feedback: “Moisture control is the make-or-break. DF’s drums arrive dry, nitrogen-sealed,” a procurement manager told me—informal, sure, but consistent with our inbox.
Specifications, handling, and compliance
- Standards/labels: GHS-compliant SDS; many buyers require ISO 9001 supplier status.
- Testing: KF moisture (ASTM E203), ICP‑OES metals, sieve cuts for processability.
- Service life: 18–24 months sealed; after opening, use quickly under dry nitrogen.
- Safety note: phosphorus pentasulfide is water-reactive; hydrolysis releases toxic/flammable H2S—use closed, dry systems and appropriate PPE and gas detection.
Citations
- NIH PubChem Compound Summary: Phosphorus pentasulfide. https://pubchem.ncbi.nlm.nih.gov/compound/Phosphorus-pentasulfide
- NIOSH Pocket Guide to Chemical Hazards: Hydrogen sulfide (for hydrolysis hazard context). https://www.cdc.gov/niosh/npg/npgd0337.html
- UNECE GHS (Rev. 9): Globally Harmonized System of Classification and Labelling of Chemicals. https://unece.org/ghs-rev9-2021
