Direct procurement of epichlorohydrin (ECH, CAS 106-89-8) requires alignment between product quality, dangerous-goods logistics, and commercial transfer points that differ substantially from standard chemical distribution. With a molecular weight of 92.52 g/mol, a closed-cup flash point of approximately 31 °C, vapour pressure of 1.7 kPa at 20 °C, and density near 1.18 g/cm³ at 20 °C, ECH is simultaneously flammable, toxic, and corrosive. Its harmonised CLP classification includes Flam. Liq. 3, Acute Tox. 3, Skin Corr. 1B, Carc. 1B and Muta. 1B. The product is transported as UN 2023, packing group II, with primary hazard classes 6.1 and 3. Direct supply contracts therefore allocate not only cargo value but also responsibility for vapour exposure, polymerisation exotherms, and environmental release at the loading, transit, and discharge interfaces.

Why Does Direct Epichlorohydrin Supply Require Contractual Incoterm Precision?

Epichlorohydrin is produced through two principal industrial routes. The propylene-based route proceeds through allyl chloride chlorohydrination to dichloropropanols, followed by dehydrochlorination with calcium hydroxide or sodium hydroxide. The glycerin-based route converts renewable glycerin with hydrogen chloride in a carboxylic-acid-catalysed reaction to dichloropropanol, which is then dehydrochlorinated under continuous steam stripping. Direct supply typically originates from a production site storage tank, a terminal tank, or an ISO tank container delivered to a downstream epoxy resin, epichlorohydrin rubber, wet-strength resin, or water-treatment chemical facility. The commercial terms must identify exactly where the producer’s tank-pump discharge stops and the buyer’s transport risk begins, because ECH is not a fungible bulk petrochemical that can tolerate indifferent custody transfer.

Bulk storage of ECH is normally maintained in austenitic stainless steel 316L or 304L tanks with nitrogen blanketing and closed-loop vapour return. Carbon steel is generally avoided because trace water and chloride species can generate hydrochloric acid and cause pitting. Storage temperature should be maintained below 30 °C to limit acid-catalysed ring-opening and oligomer formation. Pump transfer equipment should use sealless magnetic-drive centrifugal pumps or air-operated double-diaphragm pumps with polytetrafluoroethylene diaphragms and secondary containment. Elastomer seals made from EPDM or nitrile are unsuitable because ECH causes swelling and loss of sealing force. Moisture ingress above 60% relative humidity during storage or transfer accelerates hydrolysis and off-spec acidity build-up. Tank containers used for direct ECH distribution should be inspected against ISO 1496-3:2019 for structural integrity and pressure test certification before loading.

Incoterms 2020 Risk Allocation for Bulk and ISO Tank ECH Shipments

Payment instruments for direct ECH supply are structured around cargo documentation and dangerous-goods release. Irrevocable letters of credit issued subject to UCP 600 remain common for cross-border bulk shipments. A confirmed L/C at sight shifts non-payment risk from the buyer’s bank to the confirming bank; a usance L/C payable after a fixed tenor of 30 days or 60 days introduces interest and political risk. Cash against documents through a collecting bank under URC 522 is used for moderate transaction sizes, but exposes the seller to refusal of documents and the cost of returning a loaded ISO tank. Open account terms are reserved for buyers with audited financial statements and a parent company guarantee or bank standby letter of credit issued under ISP98. Documentary presentations for ECH typically include commercial invoice, bill of lading or CMR consignment note, packing list, certificate of analysis, REACH registration documentation, safety data sheet, and insurance certificate when the incoterms rule requires seller-provided cargo insurance.

When Suppliers Bear Transport Risk Beyond the Named Place of Delivery

Under CIP, DAP, and DDP rules, the seller’s risk exposure extends beyond the initial loading terminal. Maritime bulk ECH shipments carried in IMO Type 2 chemical tankers are subject to the IBC Code, while packaged or ISO tank shipments follow the IMDG Code. Cargo insurance under Institute Cargo Clauses (A) covers physical loss or damage but excludes inherent vice, delay, and unseaworthiness. For ECH, the insurer may require evidence that the tank container was pressure-tested, moisture-free, and nitrogen-inerted before loading. Off-spec cargo from water ingress can be detected by Karl Fischer titration per ASTM E203-16 and by gas chromatographic purity analysis. Retain samples at load and discharge ports should be drawn from the same manifold under nitrogen to preserve evidentiary chain for insurance or contractual claims.

Direct ECH supply contracts should specify which party pays for tank container temperature monitoring, inert gas refills, and emergency response. In practice, nitrogen blanket pressure is maintained at 0.2–0.5 bar gauge in ISO tanks; relief pressure setting for safety valves is typically 4.5 bar. The product must not be stored near amines, strong acids, peroxides, or oxidising agents because acid-catalysed ring-opening can generate heat and chlorinated oligomers. Preloading inspection should verify tank trailer pressure test certification per ISO 1496-3 and cleanliness to water-white appearance. When the receiving facility is located in a high-humidity coastal region, moisture exclusion through closed-loop vapour return and nitrogen padding is critical above 70% relative humidity.