Tetrahydrofuran (THF) declared under HS code 2932110000 is a saturated five-membered heterocyclic ether with molecular formula C4H8O, CAS Registry Number 109-99-9, and EC Number 203-726-8. The tariff position is governed by Harmonized System heading 29.32, covering heterocyclic compounds with oxygen hetero-atom only, and subheading 2932.11 captures tetrahydrofuran. Classification under General Interpretative Rules 1 and 6 remains unchanged for solvent-grade, polymerisation-grade, and low-water battery-grade THF, provided the product is not formulated into a compounded cleaning preparation or a pharmaceutical preparation. A typical industrial specification for solvent-grade THF is THF content ≥99.95% by gas chromatography, water ≤0.005% by Karl Fischer coulometry, peroxide ≤0.005% as H2O2, and butylated hydroxytoluene stabiliser at 100–250 mg/kg. THF transport classification is UN 2056, Class 3, Packing Group II, with a closed-cup flash point of approximately -14 °C.

Industrial THF is obtained by acid-catalyzed cyclodehydration of 1,4-butanediol at 120–140 °C with a residence time of 20–40 min; by-product streams from Reppe-based 1,4-butanediol production may contain 0.01–0.2% 2-methyltetrahydrofuran, water, and low-boiling acetals. The declaration does not require the production route, but the composition element must report the named impurities that affect end-use or hazard classification. In a drumming line operating at 30 m³/h, nitrogen blanketing at 0.1–0.3 bar overpressure and conductive earthing below 10⁴ Ω are used to limit peroxide formation and electrostatic ignition; these process parameters are not declared separately, but they appear in the safety and quality documentation reviewed during customs audits.

Commercially available THF is stabilised with butylated hydroxytoluene because the ether undergoes autoxidation to hydroperoxide species; peroxide value is therefore a critical declaration element when the material is stored in warm climates or partially emptied drums. Long-term storage is recommended below 25 °C, and drum lots stored for more than 12 months after production should be re-tested. The Chinese customs declaration does not require storage history, but a high peroxide value may trigger hazardous chemical controls or a lower declared value due to off-spec classification.

What Does Chinese Customs Require for the Declaration Elements of THF Under 2932110000?

Chinese import and export declarations for commodity code 2932110000 require structured elements: product name, composition/content, use, packaging type, brand type, model, CAS number, GTIN where applicable, and dangerous goods package category. The product name is declared as Tetrahydrofuran in English, with the corresponding Chinese designation supplied in the Chinese-language declaration field. Composition is stated as a mass fraction against the nominal THF assay, expressed to two decimal places. The use element must align with the contract end-use and SDS Section 2; acceptable examples include solvent for polytetramethylene ether glycol (PTMEG) polymerisation, solvent for polyvinyl chloride solution polymerisation, or solvent for organolithium reaction systems. Packaging typical values are 200 L UN 1A1 steel drums containing 180 kg net weight, or ISO tank containers with pressure relief valves set at 0.4–0.6 MPa.

Customs declaration fields for composition should distinguish between the assay value and the nominal data sheet value. For THF with a certificate of analysis listing THF 99.98%, water 0.002%, peroxide 0.0005%, and butylated hydroxytoluene 150 mg/kg, the declaration must use the batch certificate data rather than the product data sheet range. The customs laboratory method for water is Karl Fischer coulometry under ASTM E203, and the moisture result is expressed in percent by mass. The peroxide result is expressed as hydrogen peroxide equivalent; iodometric titration uses sodium thiosulfate standardised to potassium hydrogen phthalate.

Declaration disputes for 2932110000 often arise when the trade description is “THF 99.9%” without the CAS number or when peroxide and water are omitted. The stabiliser mass fraction should be included when it exceeds 0.1%, because the customs laboratory may compare the declared composition with the actual butylated hydroxytoluene content by GC-MS or HPLC. For THF used in Grignard reactions or anionic polymerisation, water above 0.01–0.02% can deactivate the organometallic initiator; therefore the declared water maximum is commercially relevant. THF is not subject to import licensing, but it is a hazardous chemical and the declaration must carry the correct dangerous goods package category and emergency contact.

From a transport perspective, the declaration must classify the material under UN 2056, Class 3, Packing Group II, with limited quantities per ADR 3.2.5 if applicable. The closed-cup flash point is approximately -14 °C; explosive limits in air are 2.0–11.8 vol%. These data are obtained from SDS Section 9 and are cross-checked against the dangerous goods package category in the Integrated Customs Declaration Form. For shipments in 200 L drums, the net quantity per package must be declared as 180 kg or the actual filled mass, and the number of packages must match the packing list. ISO tank containers for THF require a UN portable tank code T4 or T11, a maximum allowable working pressure of at least 0.4 MPa, and pressure relief valves set at 0.4–0.6 MPa. The tank must be purged with nitrogen to an oxygen concentration below 5 vol% before loading.

MFN Duty, VAT, and Import Cost Composition for 2932110000

The MFN import duty for HS 2932110000 under the Chinese Customs Tariff is 4.0%. The general rate for non-MFN origin is 20.0%. Value-added tax is 13.0%, calculated on the sum of CIF value plus import duty. Consumption tax is not applicable to tetrahydrofuran. The effective port-level fiscal multiplier for MFN-origin THF is therefore 1.04 × 1.13 = 1.1752. For a representative shipment with a declared CIF value of USD 32,000, the MFN duty is USD 1,280 and the VAT is USD 4,326.4. The total customs fiscal cost before port handling is USD 5,606.4.

The fiscal calculation must use the CIF value excluding VAT. Under Chinese customs valuation rules, the dutiable value is the transaction value adjusted for packing, commission, and assists such as catalysts or stabilisation aids supplied free of charge. For ISO tank shipments, separately identified demurrage is not part of the customs value. When the declared value is lower than the customs risk database threshold, the customs laboratory may issue an assay report for THF purity and moisture; a value correction is then processed under the Customs Valuation Agreement. Transfer pricing documentation should include the product technical grade because water content and peroxide content can explain price differences between off-spec and on-spec THF.

Provisional duty rates may apply in a particular year. The Chinese tariff schedule can issue a provisional import duty for THF below the MFN rate, but published data for such a provisional rate for 2932110000 is limited. Importers should not assume that the MFN rate is automatically the lowest available rate when an FTA or RCEP certificate of origin can be obtained.

If RCEP Preferential Access Is Claimed Without Satisfying the Direct Consignment and Origin Documentation Requirements

RCEP preferential tariff treatment for THF under 2932110000 is not a single global rate; it is defined by the importing and exporting parties and the implementation year. China’s RCEP schedule reduces the 4.0% MFN base for Japanese-origin THF in annual stages, with the final concessional rate at 0%. The importer must place the exact HS code 2932110000 on the certificate of origin and comply with the direct consignment rules in RCEP Chapter 3. For THF produced by dehydration of 1,4-butanediol, the origin criterion is usually change in tariff classification because the feedstock diol is classified in heading 2905 and the final cyclic ether is classified in heading 2932. When the change in tariff classification rule cannot be demonstrated, the regional value content threshold of 40% applies. Invalid origin documentation results in assessment at the MFN rate of 4.0% or the general rate of 20.0%.

Since China already has bilateral FTAs with most ASEAN members, Korea, Australia, and New Zealand, the practical RCEP margin for THF is most relevant for Japanese-origin product. Declarants should compare the China-ASEAN FTA Form E rate, the China-Korea FTA rate, and the RCEP rate for the same ten-digit code and select the lowest rate for which valid origin proof exists. The choice is an importer obligation. RCEP also permits approved exporter self-certification in some signatories after the transitional period; when the certificate is issued by a non-approved body or the HS code is annotated as 2932.11 instead of 2932110000, the Chinese system may reject the preferential claim until the certificate is re-issued.

The regional value content formula under RCEP is (FOB − VNM) / FOB × 100, where VNM is the value of non-originating materials. The build-up method is (VOM + direct labour + overhead + profit) / FOB × 100. The certificate of origin validity is 12 months from the date of issue. For Japanese-origin THF, the staging category requires yearly verification; importers should not assume that the current year’s rate equals the previous year’s rate minus a fixed arithmetic step. Published data for the exact year-specific applied rate for this ten-digit code is limited in secondary sources and must be obtained from the General Administration of Customs China FTA Service Platform.

RCEP Article 3.16 requires a valid certificate of origin to support preferential tariff treatment. The certificate must include the certificate number, exporter and importer details, origin criteria, and the HS code. For heading 2932, the product-specific rule may be expressed as a change to heading 2932 from any other heading, or as RVC 40%, depending on the exporting party and the negotiated schedule. A customs declaration showing RCEP preference without a matching certificate number will be rejected at the port and the importer may be required to post a duty deposit.

Declaration Elements and RCEP Rates Are Reviewed Against the Chinese Customs Laboratory Classification Decision

Customs officers may draw samples of THF from the declared consignment to verify the composition element. The sample is tested by Karl Fischer titration for water, iodometric titration for peroxide, and gas chromatography for THF purity. If the measured THF content deviates from the declared value by more than the method repeatability, the declaration element is deemed non-compliant and the importer must correct the composition field under the same HS code. The HS code itself remains 2932110000 for unformulated THF; however, a prepared solvent containing THF, acetone, and inhibitors is not classifiable in 2932.11 and may require a separate prepared product code. A security deposit may be required to release the goods during laboratory verification. The RCEP preferential rate is suspended if the certificate of origin contains a different ten-digit code or the goods are not directly consigned.

Storage of stabilised THF drums at ambient temperatures above 35 °C increases peroxide formation; drum lots stored for more than 12 months should be re-tested before customs declaration and before use in water-sensitive organometallic processes. Unstabilised THF kept under air at greater than 60% relative humidity can develop peroxide levels exceeding 0.015% within 30 days; this is a recognised operational boundary. The declaration elements must therefore reflect the stabiliser and moisture content at the time of import, not the original production certificate.