If you've ever wondered how silicon wafers get their phosphorus doping, or how certain flame-retardant plastics get their fire resistance, the answer very often traces back to a single liquid: phosphorus oxychloride. It's a compound most people outside industrial chemistry have never heard of, yet it sits quietly behind electronics manufacturing, agrochemical synthesis, and specialty plastics. This guide covers what phosphorus oxychloride (POCl3) is, where it's used, and how bulk sourcing actually works.
Check current stock and request pricing on the Phosphorus Oxychloride product page.
What Is Phosphorus Oxychloride?
Phosphorus oxychloride (POCl₃), also known by its IUPAC name phosphoryl trichloride, is a colorless to pale yellow fuming liquid with a sharp, pungent odor. It's made industrially by reacting phosphorus trichloride with oxygen or by oxidizing PCl3 with other oxidants, and it reacts violently with water — a fact that shapes almost every handling decision around it.
Chemical Identity at a Glance
| Property | Value |
|---|---|
| Chemical formula | POCl₃ |
| CAS number | 10025-87-3 |
| IUPAC name | Phosphoryl trichloride |
| Appearance | Colorless to pale yellow fuming liquid |
| Boiling point | 105.8°C |
| Melting point | 1.25°C |
| Density | ~1.675 g/cm³ at 20°C |
| Water reactivity | Reacts violently — must be kept moisture-free |
Industrial Uses and Applications
POCl3's usefulness comes down to one core property: it's an excellent phosphorylating agent, meaning it readily introduces a phosphate-type group into other molecules. That single trait fans out into a surprising number of end industries.
Flame Retardants
A significant share of global POCl3 demand goes into producing organophosphate flame retardants, used in everything from electronics casings to foam insulation and textiles. As fire-safety regulations tighten across sectors, this remains one of the steadier demand drivers for the chemical.
- Key intermediate for organophosphate flame-retardant compounds
- Used in flame-retardant treatments for plastics, foams and textiles
- Demand tracks closely with fire-safety regulatory standards
Semiconductor Manufacturing
Here's a use most people wouldn't guess: POCl3 is a standard dopant source in silicon wafer processing, used to introduce phosphorus into silicon during diffusion doping. It's a specialised, high-purity application — semiconductor buyers are typically the most demanding on assay and trace-metal content of any POCl3 customer segment.
Pharmaceutical and Agrochemical Intermediates
In pharma synthesis, POCl3 is a reagent for building phosphate-based intermediates and for certain chlorination and dehydration steps. In agrochemicals, it's a precursor in the synthesis of several organophosphorus pesticides and herbicides — a chemistry family that's been a mainstay of crop protection for decades.
Plasticizers
POCl3 also feeds into the production of certain phosphate-ester plasticizers, used to improve flexibility and fire resistance in PVC and other polymer formulations.
Handling, Storage and Safety
POCl3 is classified as acutely toxic (Category 3) and corrosive (Category 1B) — this isn't a chemical you want sitting around in improvised packaging. The good news: with the right storage discipline, it's manageable at industrial scale without drama.
- Store at ambient temperature in a well-ventilated area
- Keep strictly away from moisture — it reacts violently with water
- Use sealed, corrosion-resistant containers only
- Typical shelf life is around 1 year in a properly sealed container
- Always request the SDS before your first delivery and brief your handling team on it
Grades and Documentation
BulkFineChem supplies phosphorus oxychloride in industrial grade — check current packaging, MOQ and assay on the product page. Every order comes with a GST tax invoice and batch-wise Certificate of Analysis; SDS/TDS are available on request, and large consignments are covered by an e-way bill.
POCl3 vs. PCl3 and PCl5
These three phosphorus chlorides get confused constantly, and mixing them up in a purchase order is an expensive mistake.
| Chemical | Form | Typical Role |
|---|---|---|
| Phosphorus Trichloride (PCl3) | Liquid | Precursor to both PCl5 and POCl3; milder chlorinating agent |
| Phosphorus Oxychloride (POCl3) | Liquid | Phosphorylating agent — flame retardants, semiconductors, agrochemicals |
| Phosphorus Pentachloride (PCl5) | Solid | Strong chlorinating agent for acids/alcohols |
If your process sheet specifies POCl3, don't let anyone talk you into substituting PCl3 "because it's cheaper" — the chemistry they enable is genuinely different, and a substitution will show up as a failed reaction, not a cost saving.
How to Source Phosphorus Oxychloride in Bulk
- Send an enquiry — share quantity and delivery city via the product page or Quick Order
- Receive a quotation — priced per kg/MT/L based on quantity and location
- Confirm with advance payment — typically 50–100% advance
- Dispatch with documentation — GST invoice and CoA travel with every shipment; SDS/TDS on request
- Pan-India delivery, e-way billing handled for larger loads
Frequently Asked Questions
What is phosphorus oxychloride used for?
It's mainly used as a phosphorylating agent — a key intermediate for flame retardants, a dopant source in semiconductor manufacturing, and a precursor in pharmaceutical and agrochemical synthesis.
Is POCl3 the same as phosphorus pentachloride?
No. POCl3 is a liquid used mainly for phosphorylation reactions, while PCl5 is a solid used as a stronger chlorinating agent. They're related but not interchangeable in most processes.
Why does POCl3 need to be kept away from moisture?
It reacts violently with water, generating heat and corrosive byproducts. Moisture-free, sealed, corrosion-resistant packaging is essential for safe storage and transport.
What industries buy phosphorus oxychloride in bulk?
Flame-retardant manufacturers, semiconductor fabs, pharmaceutical and agrochemical intermediate producers, and plasticizer manufacturers are the main buyer segments.
Does every order come with a Certificate of Analysis?
Yes — every BulkFineChem order ships with a GST invoice and batch-wise CoA, with SDS/TDS provided on request.
What's the shelf life of phosphorus oxychloride?
Roughly one year when stored correctly in a sealed, moisture-free, corrosion-resistant container — actual shelf life depends on your storage conditions.
How do I get a price for a specific quantity?
Submit your quantity and delivery location through Quick Order, and you'll receive a quotation based on current pricing slabs.
The Bottom Line
Phosphorus oxychloride is a demanding chemical to handle, but an easy one to source correctly if your supplier takes documentation and packaging as seriously as the chemistry does. See current availability here, or head to Quick Order for a quote on your quantity and city.