A Buyer’s Field Note on Phenyl Dichlorophosphate

If you work in specialty chemicals, you’ve probably noticed the quiet resurgence of phosphorus reagents. And Phenyl Dichlorophosphate—CAS 770-12-7—keeps popping up in project briefs from pharma process teams to flame-retardant R&D. To be honest, demand is lumpy, but consistency and dryness are everything.

At a glance: technical profile

Origin: Jinling Mansions No.106-1 East Yuhua Rd., Shijiazhuang, Hebei, China. Short description: Name: Phenyl Dichlorophosphate; Molecular Formula: C6H5Cl2O2P; Molecular Weight: 210.98.

Parameter	Typical spec (≈ / real-world use may vary)
Appearance	Colorless to pale-yellow liquid
Assay (GC)	≥ 99.0%
Water (Karl Fischer)	≤ 0.03% (≤ 300 ppm)
Density (25°C)	≈ 1.36–1.42 g/cm³
Boiling range	≈ 230–240°C at 1 atm
Acidity (as HCl)	≤ 0.05%

Compliance: typically supported with ISO 9001 QMS, REACH-ready documentation (where applicable), and TSCA listing checks; always verify with the current SDS and CoA.

Where it’s used (and why it matters)

• Pharmaceutical process development: chlorophosphorylation reagent for forming phosphate esters in API route scouting.
• Specialty polymers and coatings: intermediate toward flame-retardant and plasticizer chemistries.
• Electronics resins: tailored phosphate esters for thermal stability and adhesion tuning.
• Fine chemicals R&D: selective activation of alcohols/phenols under controlled moisture.

Many customers say moisture control is the make-or-break variable. I guess that’s unsurprising—hydrolysis generates HCl and can skew downstream selectivity.

Process flow we see working in practice

1. Raw material verification: identity (GC/FTIR), appearance, water (ASTM E203 KF).
2. Inert handling: nitrogen-blanketed transfers; dry, lined drums or fluoropolymer jerrycans.
3. Batch release tests: assay by GC, chloride/acidity, color index, water.
4. Packaging & labeling: UN-rated corrosive labeling per SDS; tamper-evident seals.
5. Logistics: temperature-moderated transport; keep sealed and dry.
6. Service life: ≈ 12–24 months unopened; after opening, plan use within 2–3 months with nitrogen headspace.

Testing standards: KF water (ASTM E203), GC purity with ISO/IEC 17025-calibrated methods, routine color/appearance per internal SOPs; third-party confirmation on request.

Vendor snapshot (quick comparison)

Vendor	Purity (GC)	Water (ppm)	Packaging	Compliance	Lead time
Sincere Chemicals	≥ 99.0%	≤ 300	1 kg, 20 kg, 200 kg	ISO 9001, SDS/CoA	≈ 2–4 weeks
Vendor A	≥ 98.5%	≤ 500	5 kg, 25 kg	ISO 9001	≈ 3–6 weeks
Vendor B	≥ 99.0%	≤ 350	10 kg, 200 kg	REACH-ready	Stock/rolling

Note: figures are indicative. Always confirm the current CoA and SDS, especially for moisture limits.

Customization & feedback from the field

• Packaging: fluoropolymer-lined drums; nitrogen pad; sample kits for method development.
• Spec tightening: water ≤ 200 ppm for moisture-sensitive routes—available upon request.
• Documentation: lot-specific GC/KF chromatograms, stability letters, and transport guidance.

Customer voice: “Surprisingly stable in our climate-controlled store—no drift in acidity after 60 days,” one coatings buyer told me. Another pharma CRO said, “The dryness control saved a couple of reworks.”

Mini case notes

Specialty resin maker cut batch variability by 38% after switching to tighter KF limits and nitrogen-blanketed deliveries of Phenyl Dichlorophosphate. Meanwhile, a pharma process team hit target impurity specs by revising storage to dry rooms (≤ 30% RH) and using single-use 20 kg packs to avoid repeated exposure.

Safety and handling (short take)

Treat as corrosive/reactive toward moisture. Use closed systems, nitrile gloves, splash goggles, and local exhaust. Follow the SDS; dispose via licensed waste partners in line with local regulations.

Authoritative citations

1. PubChem Compound Summary: Phenyl dichlorophosphate (CAS 770-12-7). https://pubchem.ncbi.nlm.nih.gov/compound/Phenyl-dichlorophosphate
2. ECHA (European Chemicals Agency) – Information on Chemicals. https://echa.europa.eu/information-on-chemicals
3. eChemPortal (OECD) Global Portal to Information on Chemical Substances. https://www.echemportal.org/
4. ASTM E203 – Standard Test Method for Water Using Volumetric Karl Fischer Titration. https://www.astm.org/e0203
5. ISO/IEC 17025 – General requirements for the competence of testing and calibration laboratories. https://www.iso.org/standard/66912.html