Before You Order THF: 14 Answers on MOQ, Lead Time & Documents

Tetrahydrofuran (THF, CAS 109-99-9, UN 2056) is a water-miscible cyclic ether with a normal boiling point of 65–66 °C at 101.325 kPa and a closed-cup flash point of −14 °C. The primary industrial derivative is polytetramethylene ether glycol (PTMEG) for segmented polyurethanes; THF is also consumed as a reaction solvent in organolithium and Grignard chemistry, in pharmaceutical crystallization, and in solvent welding of PVC. Procurement files for THF must reconcile hazardous-cargo classification, stabilizer control, analytical release data, and destination-specific regulatory documents before a purchase order is approved.

For drum-level procurement, the minimum order quantity is commonly one pallet of 4 200 L drums, equivalent to approximately 720 kg net at 180 kg per drum. Single-drum releases are available from some distributors but carry higher freight cost per kilogram because the UN-rated 1A1 or 1A2 carbon steel drum must be moved as a hazardous material irrespective of volume. Drum specifications typically include an internal epoxy-phenolic lining and 3/4-inch/2-inch bungs. The minimum order may be waived for laboratory quantities only if the consignee accepts the full dangerous goods documentation burden.

What minimum order quantity applies to intermediate bulk containers?

The 1000 L composite IBC is normally sold as a one-unit minimum, with a net fill of approximately 890 kg. The IBC is configured with a blow-molded high-density polyethylene inner bottle, a galvanized or painted steel cage, and a bottom discharge valve. Loading is performed through a closed-loop nitrogen sweep to limit atmospheric exposure; the sweep gas is shut off when the IBC is sealed. For BHT-stabilized material, the supplier may require a minimum of 1 IBC per shipment because a partially emptied IBC presents peroxide formation risk at the liquid–vapour interface. The IBC is not considered suitable for BHT-free THF unless the inner bottle has been nitrogen-purged and the valve is fitted with a dry-break coupling.

Bulk tank orders are normally quoted on a per-tank basis; a 20 ft ISO tank carries approximately 18,000 kg of THF at 20 °C. Spot buyers may order a single tank from a terminal in Rotterdam, Houston, or Ulsan, but contract allocations of 3–6 tanks per quarter are typically required for guaranteed berth space and stabilizer re-test sequencing. The tank is a T11 stainless steel liquid container with top or bottom discharge; THF loaded for export is blanketed with nitrogen to a positive gauge pressure and sealed with numbered cable seals. The fill ratio is limited by the transport code for a Class 3 liquid with a boiling point above 35 °C, so the maximum loaded volume remains below the full water capacity of the tank.

Domestic Drum Lead Time Determinants

Stocked drum shipments from regional terminal networks are generally released within 3–7 working days after order acceptance. The lead time includes document review, drum re-test if batch age exceeds the supplier’s internal peroxide retest interval, and hazardous-materials carrier scheduling. A batch with a peroxide result above the release limit may be diverted to re-stabilization or downgraded for internal use. Same-day or next-day loading of a single pallet is technically possible but requires pre-booked DG truck capacity. The actual lead time is confirmed only after the certificate of analysis is matched to the lot number on the drum label.

Imported bulk lead time is determined by marine transit, terminal nomination, and customs clearance. A spot ISO tank from Northwest Europe to the U.S. Gulf typically requires 30–45 days from loading to arrival at the final tank farm; Northeast Asia origins may extend the window to 45–60 days. The lead time is not linear because terminal nomination must be confirmed before the vessel cutoff, and THF cargoes cannot be consolidated with Class 1 or Class 5.1 materials on the same ocean bill. Demurrage is charged per day after the free time at the destination terminal, so the receiving tank must be free of water and oxygen before hook-up.

When a Cross-Border Drum Shipment Requires Additional Transport Documents

A cross-border drum order requires a dangerous goods declaration under ADR, IMDG, or 49 CFR 172.202, depending on the transport mode. The proper shipping name is “Tetrahydrofuran,” Class 3, Packing Group II, UN 2056. The declaration must show the closed-cup flash point of −14 °C, the net mass per drum, and the number of packages. For sea freight, the shipper must also provide a signed container/vehicle packing certificate. A missing or inconsistent UN number on the invoice is a common customs hold risk. The shipping paper must be signed by a trained hazardous materials employee; training documentation is retained according to 49 CFR 172.704.

The certificate of analysis for stabilized industrial THF typically reports purity by gas chromatography with flame ionization detection as area percent, water by Karl Fischer titration per ASTM E203, density at 20 °C by ASTM D4052, APHA color by ASTM D1209, and BHT stabilizer content by a calibrated GC or UV method. Common acceptance values are purity ≥99.9 area%, water ≤0.03 wt%, density 0.885–0.892 g/cm³, APHA ≤10, and BHT 50–250 mg/kg. For polymerization-grade THF used in PTMEG production, water is often controlled below 0.01 wt% because excess water can alter the number-average molecular weight of the polyether diol and destabilize spandex-grade process viscosity. A COA that does not state the batch number, production date, and retest date is not sufficient for most ISO 9001 or chemical distribution audit programs.

What REACH and RoHS statements are relevant for THF procurement?

THF placed on the EU market must be covered by a registration under Regulation (EC) No 1907/2006 for the applicable tonnage band. The SDS must include an exposure scenario for workers and the environment in the Annex. A REACH statement is not a test report; it identifies the legal entity, registration number, substance identity, and use descriptor coverage. RoHS Directive 2011/65/EU does not directly regulate THF as a chemical preparation. A RoHS statement for THF can only state that the solvent is not a listed homogeneous material restriction under the directive. Buyers requiring a RoHS letter for a finished assembly should request a supplier statement limited to the ten restricted substances and their concentration thresholds.

Stabilizer documentation becomes operationally critical because THF is a Class B peroxide former. BHT-stabilized THF is normally released with a peroxide value below 10 mg/kg as H₂O₂ equivalent; an opened drum may exceed 50 mg/kg after extended air exposure depending on storage temperature and headspace oxygen. Suppliers issue a stabilizer certificate or include BHT concentration on the COA. For laboratories and pilot plants, the peroxide retest interval after first opening is commonly 6 months; material that fails the retest must be quenched or disposed as reactive waste under site-specific hazardous waste permits. The documentation should record the stabilizer addition on the batch sheet and confirm that no uninhibited THF was loaded into the same tank or filling line.

Pharmaceutical-Grade THF and Residual Solvent Documentation

Pharmaceutical reaction solvent users may require a grade produced under current good manufacturing practice with a USP or Ph. Eur. monograph reference. The analytical file must include residual solvent testing relevant to ICH Q3C, water content by ASTM E203, and a statement of absence of mutagenic impurities where relevant. Low-stabilizer or BHT-free THF used in organometallic chemistry may carry acceptance limits such as BHT 10 mg/kg, water 0.01 wt%, and peroxide 5 mg/kg; this grade is generally made to order under inert gas and filled into pre-purged stainless steel drums. The lead time for such BHT-free material is normally 10–15 working days longer than stock stabilized THF. Published data for this specific configuration is limited to supplier-specific specification sheets and audit documents.

Custom labeling, private-label documentation, or non-standard drum markings add 5–10 working days to a domestic order when the filling line must be cleared and segregated for the run. The documentation lead time is separate from transport; a buyer may receive the COA and SDS in electronic form 1–2 working days after dispatch, while the original hard-copy certificate of origin and dangerous goods declaration are attached to the driver’s pouch or couriered separately. For import shipments, original documents are often routed through the negotiating bank under a letter of credit, which can delay customs release if a malformed document is not corrected before vessel arrival.

Which tank container documents are required for bulk THF?

Bulk THF orders require the standard export documentation plus a tank container cleanliness certificate, a last cargo certificate, and an ullage report. The cleanliness certificate confirms that the T11 tank was cleaned to a hydrophobic solvent-free state and inspected before loading. The last cargo certificate is used to rule out prior carriage of foodstuffs, reactive monomers, or chlorinated solvents that could generate hydrogen chloride or contaminate tetrahydrofuran. The ullage report records the loaded volume, temperature, and remaining vapour space after top loading. For BHT-free THF, the supplier should also issue a nitrogen blanket certificate stating the initial oxygen content of the tank vapour phase was below the agreed limit, often 3 vol% before closing.

Import clearance for THF frequently stalls when the commercial invoice does not match the packing list or when the COA lot number does not match the drum labels. A compliant export file should include the shipper’s dangerous goods declaration, the carrier’s bill of lading or air waybill, a packing list with package type and net mass, a commercial invoice with HS classification, a certificate of origin where required by the destination free-trade agreement, the REACH statement for EU destinations, and a copy of the SDS with the correct GHS revision. The practical threshold for document pre-review is usually 72 h before vessel departure; after the carrier’s documentation cutoff, corrections may require a late-document fee or a delay to the next sailing.

Annual volume commitments change MOQ and stabilizer retesting

Procurement contracts above approximately 40,000 kg per year can shift the minimum order from a single drum pallet or IBC to scheduled truck-load releases of 8,000–10,000 kg. The commercial benefit is not limited to unit price; scheduled releases reduce the time a batch sits in terminal storage where repeated nitrogen blanketing is required. Quarterly contracts often specify peroxide retesting at a fixed interval, such as every 90 days, and allow the buyer to call off drums from a dedicated lot rather than from mixed terminal inventory. For spot buyers, the practical constraint is usually not production line capacity but the availability of a clean stainless steel or lined steel tank that has not previously carried a peroxide-sensitive monomer.