Methyl acetate (CAS 79-20-9) is a saturated acyclic monocarboxylic acid ester imported into the United States as a low-boiling, non-HAP solvent and chemical intermediate. The phrase “Methyl Acetate in the US Market: Tariff, TSCA and Import Compliance” defines the operational boundary across three regimes: classification and duty assessment under the Harmonized Tariff Schedule of the United States, inventory and reporting obligations under the Toxic Substances Control Act, and cargo clearance under U.S. Customs and Border Protection and the Environmental Protection Agency. The substance is listed on the TSCA Inventory, assigned to HTSUS 2915.39.10 as the named subheading, and moves in bulk transport under UN 1231, Class 3, Packing Group II. Importers must reconcile CBP entry requirements with EPA certification and CDR reporting thresholds before release from the destination terminal.

When Methyl Acetate Is Cleared Under HTSUS 2915.39.10

Classification for methyl acetate follows Chapter 29, Section VI of the Harmonized Tariff Schedule of the United States. The named subheading HTSUS 2915.39.10 covers methyl acetate; residual other esters of acetic acid fall to 2915.39.90. The column 1 general rate of duty shown in the USITC HTS is 5.5% ad valorem, with column 1 special rates varying by trade preference program. Column 2 applies to non-normal-trade-relations countries and is substantially higher. Importers should verify the current chapter 29 editorial notes because methyl acetate may also be subject to Section 301 or IEEPA duties stacked in Chapter 99. The CBP entry summary is filed on Form 7501, and tariff classification must be declared with sufficient specificity to satisfy 19 CFR 141.61. Under 19 CFR 102.11, country of origin for methyl acetate produced by esterification of methanol and acetic acid is generally the country where the esterification reaction occurs; packaging or blending in another country does not confer origin. A cargo of Chinese-origin methyl acetate moved through a Canadian terminal without substantial transformation therefore does not lose its Section 301 origin for tariff purposes. Preferential claims under USMCA require a valid certificate of origin and compliance with the product-specific rule requiring a change in tariff classification or regional value content.

Tariff treatment is not limited to the general rate. Methyl acetate from a country subject to Section 301 may carry an additional Chapter 99 duty that must be transmitted at entry line level. In the automated commercial environment, a missing Chapter 99 code is a common entry reject at cargo release. Valuation follows transaction value under 19 CFR 152.103; related-party imports may draw CBP Form 28 or 29 requests for documentation. The importer of record must maintain technical records supporting classification, origin, and value for 5 years under 19 CFR 163. As of the most recent public USITC AD/CVD database query, no separate antidumping or countervailing duty order is specifically identified for methyl acetate under HTSUS 2915.39.10; however, this status must be checked immediately before each entry because petitions can be filed. Country-of-origin misclassification remains the principal tariff enforcement risk. When methyl acetate is produced in a single reaction train from methanol and acetic acid, the reactor location defines origin. If an import involves a third-country storage terminal that only performs inhibitor addition at less than 0.1 wt%, that step is generally not a substantial transformation under 19 CFR 102.11; origin remains the esterification country. Published data for this specific configuration is limited, and each entry should be reviewed against current CBP origin rulings.

What TSCA Section 13 Certification Must Appear on a Methyl Acetate Entry?

Because methyl acetate is a chemical substance under TSCA section 3(2), imports are subject to TSCA section 13 import certification. The EPA regulation at 40 CFR 707.20(b)(1)(i) requires the importer of record to provide a positive certification statement when the shipment contains chemical substances subject to TSCA. For methyl acetate, which is listed on the TSCA Inventory under CAS 79-20-9, the positive statement is used: “I certify that all chemical substances in this shipment comply with all applicable rules or orders under TSCA and that I am not offering a chemical substance for entry in violation of TSCA or any applicable rule or order under TSCA.” The negative statement under 40 CFR 707.20(b)(2)(i) is reserved for shipments in which all substances are not subject to TSCA. The certification is not submitted directly to EPA; it is provided to CBP as part of the entry documentation or commercial invoice. A copy must be retained for 3 years from the date of import under 40 CFR 707.20(c). If the shipment contains a new chemical or an unlisted impurity, section 5 of TSCA may require a PMN before import; standard methyl acetate with minor methanol and acetic acid residuals does not alter the inventory status of the primary substance. Importers must also comply with TSCA section 6 restrictions if any are published for the specific use. TSCA inventory status is verified through the EPA Substance Registry Services.

CDR reporting for methyl acetate operates on a quadrennial cycle. Under 40 CFR 711.15(b)(1), methyl acetate imported at a site in quantities of 25,000 lb or more in any calendar year triggers reporting. The site must report total volume, categories of processing and use, and concentration ranges. If annual site volume reaches 100,000 lb, Part II processing and use information is submitted in addition to Part I manufacturing/import data. Methyl acetate is not subject to the reduced 2,500 lb threshold that applies to chemicals covered by certain TSCA section 4, section 5, or section 6 actions, unless EPA issues a specific rule. Importers must designate the importer of record as the manufacturer for CDR. If methyl acetate is imported as part of a mixture, the reporting threshold applies to the methyl acetate component, not the total mixture weight. A 55-gallon drum of a 50 wt% methyl acetate formulation therefore contains only the active substance volume relevant to threshold calculation. Small manufacturers may qualify for the CDR reporting exemption under 40 CFR 711.9; eligibility is based on 40 CFR 704.3 size standards and must be documented before reliance on the exemption.

Under TSCA as amended by the Frank R. Lautenberg Chemical Safety for the 21st Century Act, importers continue to be treated as manufacturers. If methyl acetate were designated as a high-priority substance, import compliance could include section 6 risk management obligations and workplace controls. As of the date of this document, no final TSCA section 6 rule specific to methyl acetate is known; published data for this specific configuration is limited. Importers must monitor Federal Register notices because a final rule restricting a use or requiring exposure controls would become an importable set of conditions. The TSCA certification statement does not waive CBP classification, valuation, or origin requirements, nor does it replace state permit conditions for storage and vapor control.

Bulk import compliance extends beyond tariff and TSCA documentation. Methyl acetate is a flammable liquid under 49 CFR 172.101 with the proper shipping name “Methyl acetate,” UN 1231, Class 3, Packing Group II. The closed-cup flash point is approximately −10 °C, and the boiling point is 56.9 °C at 101.3 kPa. Vapor pressure is approximately 21.7 kPa at 20 °C, creating a continuous fire and vapor-exposure boundary at unloading stations. Tank containers and railcars must meet the portable tank and cargo tank requirements of 49 CFR Part 173 and 49 CFR Part 177. Under 29 CFR 1910.1000 Table Z-1, the OSHA permissible exposure limit is 200 ppm as an 8-hour TWA. The lower explosive limit is approximately 3.1 vol% and the upper explosive limit is approximately 16.0 vol%. Unloading areas therefore require Class I Division 1 electrical classification under NFPA 70 Article 500 at the point of vapor release and continuous flammable gas detection. Methyl acetate is a VOC under 40 CFR 51.100(s) and is not exempt under the EPA VOC list for ozone compliance. Published data for specific terminal ventilation configurations is limited; operators should use site-specific calculations for venting capacity and vapor dispersion.

Storage and receiving operations for imported methyl acetate introduce post-import compliance obligations. At solvent distribution terminals, methyl acetate is transferred into stainless steel or carbon steel storage with nitrogen blanketing. Pressure/vacuum venting is designed to API 2000 or the applicable local fire code. Nitrogen padding avoids moisture uptake and maintains an inert vapor space, but pad pressure must remain below the tank maximum allowable working pressure and above atmospheric pressure. Grounding and bonding are required because of the low conductivity typical of ester solvents. Sampling for import quality verification is performed at the cargo manifold before breaking containment, using a closed-loop sampler to limit vapor release. Certificates of analysis for methyl acetate typically report assay by gas chromatography, methanol content, water content, and acidity as acetic acid; importers must retain these records with the TSCA certification because they support the inventory composition if CBP raises a classification or valuation inquiry.

Under EPCRA section 312, a facility holding imported methyl acetate in quantities of 10,000 lb or greater must file a Tier II hazard report because methyl acetate is an OSHA-defined hazardous chemical with a flammable liquid hazard. Reporting is made annually by March 1 under 40 CFR 370.40. SARA 313 toxic chemical release reporting may not be triggered solely by methyl acetate; importers should verify current 40 CFR 372.65 listing because methanol and acetic acid residues may be separately listed and may cross threshold quantities if bulk storage is large. These EPCRA duties do not replace tariff classification or TSCA certification, but they establish the post-import compliance boundary at distribution terminals.

At the import operations level, the critical control point is aligning the CBP entry summary with the TSCA certificate. A methyl acetate shipment of 20,000 kg in an ISO tank requires the CBP entry line to report HTSUS 2915.39.10, the applicable Chapter 99 duty if country-of-origin-based, and the TSCA positive certification. A single 20,000 kg shipment equals approximately 44,092 lb, exceeding the CDR threshold of 25,000 lb if the importer site is not otherwise exempt. The TSCA certificate is retained for 3 years; CDR records are retained through the applicable reporting cycle. For the US market, imported methyl acetate also enters downstream solvent blending, where the importer must verify that product specification meets the customer’s VOC and residual methanol limits before filing entry. Misclassification, missing certification, or incomplete CDR documentation can delay cargo release and create enforcement exposure under CBP and EPA authority.