Pencycuron industry brief: specs, use-cases, and what buyers really ask

Sourced from No. 66 Xiangtai Road, Yuhua District, Shijiazhuang City, Hebei Province, China, Pencycuron sits in that practical sweet spot for seed treatment and soil-borne disease control. I’ve seen buyers return to it for Rhizoctonia management on potatoes and ornamentals—quietly effective, and honestly, less fussy in the warehouse than many newer actives.

What it is (and the real-world picture)

On paper, Pencycuron is a pure white crystalline fungicide (CAS 66063-05-6) with MW 328.84. In practice, buyers sometimes meet it as a reddish liquid—typically a formulated concentrate—so don’t be surprised by that. The technical grade’s hydrophobicity (LogP ≈ 5.39) explains the insolubility in water and the preference for organic solvents.

Parameter	Typical spec (tech grade)	Notes
CAS	66063-05-6	Identity
Appearance	White crystals (tech)	Formulations may appear reddish liquid
Density	≈ 1.22 g/cm³	Real-world use may vary
Melting point	129–134 °C	QC check
Boiling point	≈ 528.5 °C (760 mmHg)	Calculated
Flash point	≈ 273.4 °C	Safety data
Refractive index	n = 1.619	Formulation dependent
Solubility	Soluble in DCM; slightly in toluene; water insoluble	Process/handling note
Assay (HPLC)	≥ 98.0% a.i.	Per FAO/CIPAC method

Process flow, QC, and shelf life

• Materials: aromatic urea intermediates, chlorobenzyl reagents, cycloalkyl amines, high-purity solvents.
• Methods: controlled urea coupling, benzylation, purification via recrystallization; particle-size tuning for SC/FS.
• Testing standards: HPLC assay and impurity profiling (CIPAC/FAO), GC for residual solvents (OECD), KF water, mp range, IR identity.
• Service life: ≈ 2 years sealed; store cool, dry, ventilated; segregate from food/feed during transport.
• Industries: crop protection (seed treatment, soil drench), ornamental horticulture, turf management.

Application scenarios

Growers use Pencycuron for Rhizoctonia spp. on potatoes (seed tuber treatment), ornamentals, and some nursery crops. Typical rates: seed treatment 50–100 g a.i./100 kg seed; in-field sprays or drenches depend on formulation—always follow local labels, obviously.

Advantages people mention: good seed coverage, low phytotoxicity in labeled crops, and compatible tank-mix behavior with common polymer binders in FS formulations.

Vendor snapshot (buyer’s quick compare)

Vendor	Location	Purity (a.i.)	Lead time	Certs	Notes
Hebei supplier (origin)	Shijiazhuang, CN	≥98.0%	≈ 10–15 days	ISO 9001/14001 (typ.)	Flexible on FS/SC customizations
EU formulator	EU	Formulated	≈ 3–4 weeks	REACH (where applicable)	Regulatory support strong
APAC blender	SEA	SC/FS	≈ 2–3 weeks	ISO (varies)	Cost-effective, MOQs apply

Customization and packaging

Common options: Pencycuron tech powder with specified particle size; SC (suspension concentrate) 25–50% a.i.; FS (seed-treatment) 20–35% a.i. Packaging ranges from 25 kg fiber drums (tech) to 1–20 L jerrycans (formulations). SDS and COA supplied; third-party testing (per OECD GLP labs) on request.

Field notes and feedback

Many customers say Pencycuron plays nicely as a base seed treatment, with consistent suppression of Rhizoctonia scurf on potatoes. One northern EU packer reported a 12–18% reduction in tuber blemish scores after switching to an FS built on this a.i.—not a miracle, but real money saved at grading.

Authoritative references

1. FAO/WHO JMPR Evaluations: Pencycuron (active substance review). https://www.fao.org
2. EU Pesticides Database – Active substances: Pencycuron. https://food.ec.europa.eu/
3. PubChem Compound Summary: Pencycuron. https://pubchem.ncbi.nlm.nih.gov/compound/Pencycuron
4. CIPAC Handbook: Analytical methods for pesticide technicals and formulations. https://www.cipac.org/