Methylene Chloride: Global & US‑California Manufacturers List, Key Uses, HS Code and Latest Price Updates

Commercial dichloromethane, also designated methylene chloride, is identified by CAS 75-09-2 and customs code 2903.12. The solvent is manufactured predominantly by free-radical chlorination of methane or methyl chloride, followed by separation from co-produced chloromethane, chloroform and carbon tetrachloride; thermal chlorination reactors typically operate in the 400–500°C range with molar chlorine-to-carbon feed ratios adjusted to shift selectivity toward the dichloro product. Purified methylene chloride has a boiling point of 39.6°C, melting point of -96.7°C, vapor pressure near 47 kPa at 20°C, density near 1.33 g/cm³ at 20°C, and water solubility of approximately 13.2 g/L at 25°C. Stabilization with amylene or cyclohexane at 0.002–0.05 wt% is applied to prevent oxidative hydrolysis during storage and transport. These physical properties explain the solvent’s function in volatile extraction and coating removal, but they also require closed-transfer systems, low-emission tank vents and downstream activated-carbon capture in production-scale operations. In pharmaceutical and reaction-solvent service, low-water and low-acidity technical grades are commonly specified because residual stabilizers and iron contamination can interfere with catalytic transformations and with the interfacial tension characteristics of polymerizations. The product is therefore not a single fungible commodity; grade selection is controlled by the intended unit operation, regulatory residue target, and downstream solvent recovery design, rather than by generic “solvent grade” labeling.

Supply-side economics are inseparable from chlorine and methanol contract values because methylene chloride is rarely produced in dedicated single-product plants. Integrated chlorinated hydrocarbon trains balance demand for chloroform, carbon tetrachloride and perchloroethylene, so the operating rate of a methylene chloride distillation column can be constrained by downstream co-product offtake rather than by methylene chloride demand alone. This co-product coupling is a critical plant constraint observed in Gulf Coast facilities using forced-circulation reboilers and high-purity distillation columns with 50–70 theoretical stages; published data for the exact stage counts of individual merchant plants is limited because licensors treat the distillation train design as proprietary. Nonetheless, the design intent is to achieve 99.9 wt% methylene chloride for technical grade and 99.95 wt% or higher for ACS reagent grade, with residual water below 0.02 wt%. The atmospheric boiling point imposes a maximum practical ambient storage temperature because vapor pressure rises steeply above 25°C, and bulk terminals in North America and Asia therefore use refrigerated or pressure-vacuum vented storage designed to avoid relief-valve actuation during hot-weather startup. Operators at repackaging facilities commonly observe that drum-filling lines require local exhaust velocities in the range of 0.4–0.6 m/s at the fill point, measured in accordance with ACGIH ventilation design guidance, to maintain area concentrations below the action level and prevent fugitive vapor migration into adjacent work zones.

What Determines Global Methylene Chloride Supply Security and Plant Operating Constraints?

Global merchant supply is concentrated in chlor-alkali and chlorinated solvent complexes where feedstock integration lowers logistics cost. The following public trade lists identify current or recently active merchant suppliers; plant operating status changes annually, and the list should be confirmed against current safety data sheets and supplier declarations because some sites have exited merchant sales or shifted to internal consumption. Production assets are subject to environmental permits for chlorinated organics, and in several jurisdictions carbon tetrachloride co-production allocations influence start-up, turnaround, and maximum distillation throughput. The merchant supply list includes Olin Corporation in the United States, Occidental Chemical Corporation in the United States, KEM ONE in France, INOVYN ChlorVinyls in the United Kingdom and Belgium, Shin-Etsu Chemical Co., Ltd. in Japan, Tokuyama Corporation in Japan, AGC Inc. in Japan, Ercros S.A. in Spain, Spolchemie a.s. in the Czech Republic, Gujarat Fluorochemicals Limited in India, Luxi Chemical Group in China, Shandong Dongyue Chemical Co., Ltd. in China, Jiangsu Meilan Chemical Co., Ltd. in China, and Juhua Group Corporation in China. This list is not exhaustive because merchant capacity in China is fragmented and changing, with some methane-based producers integrated into fluorochemical feedstocks and others supplying downstream refrigerant or pharmaceutical intermediate producers. Global supply security is more closely linked to co-product markets than to methylene chloride demand alone; a downturn in chloroform demand or carbon tetrachloride destruction obligations can reduce chlorination train operating hours and restrict dichloromethane output even when methylene chloride contracts are available. Equipment-level reliability risks in these production chains include reboiler fouling in solvent distillation columns, seal leaks on high-temperature chlorination reactor effluent coolers, and corrosion in wet hydrogen chloride handling systems. Published failure-rate data for these specific configurations is limited, but operator experience documented in trade association process safety summaries indicates that unplanned outages in chlorinated solvent trains are often associated with the downstream product distillation section rather than with the chlorination reactor itself.

California Distribution Assets and the Absence of Primary Synthesis Capacity

Within the United States, merchant methylene chloride capacity is concentrated on the Gulf Coast, specifically in integrated chlor-alkali and chlorinated organic complexes in Louisiana and Texas. No primary methylene chloride synthesis site is located in California. The state’s manufacturing database does not identify any bulk chlorinated solvent production of methylene chloride; instead, California operations consist of repackaging, blending, purification for specific electronic or pharmaceutical applications, and terminal storage under California Accidental Release Prevention requirements. Large national chemical distributors with California logistics hubs including Univar Solutions, Brenntag and Hawkins maintain distribution and repackaging operations that may handle drummed and tote volumes but do not operate chlorination reactors. Users in the San Francisco Bay Area, Los Angeles Basin and San Diego County typically source from out-of-state manufacturers via bulk transload, and lead times can be longer because of California-specific delivery documentation, Proposition 65 warnings, air permitting, and driver credentialing for hazardous materials. The absence of in-state production means that California buyers are exposed to Gulf Coast hurricane-related supply interruptions, railcar availability constraints, and terminal inventory draws during high-demand summer coating removal months. Repackagers in California typically receive solvent in 4,000–8,000 gallon tank trailers or ISO containers and transfer under nitrogen or a dry air pad to smaller drums and totes; vapor balance systems are required by local air districts during these transfers. The transfer equipment often includes double-walled piping, cam-lock fittings, and pressure-vacuum vents set to 1–3 psig to reduce fugitive emissions. Because California does not have a merchant synthesis plant, the terms “California manufacturer” and “US manufacturer” are not interchangeable; the state’s role is limited to formulation, distribution, repackaging and application, not primary chlorinated organic synthesis.

When Compliance Standards Overlap Across Federal, State, and Air-District Jurisdictions

Compliance in California is not straightforward because federal, state, and local air-district requirements overlap. The US OSHA methylene chloride standard at 29 CFR 1910.1052 sets an 8-hour time-weighted average permissible exposure limit of 25 ppm, a 15-minute short-term exposure limit of 125 ppm, and an action level of 12.5 ppm. Cal/OSHA enforces state-equivalent or stricter provisions and medical surveillance requirements. The US EPA TSCA methylene chloride risk management rule, codified in 40 CFR 751.601–751.621, prohibits manufacture, processing and distribution for consumer use and most commercial paint and coating removal, while requiring industrial users under continuing uses to implement a workplace chemical protection program that includes exposure monitoring, dermal protection, controlled access areas, and downstream notification. California Proposition 65 lists methylene chloride as a chemical known to cause cancer; distribution and sale of products that expose consumers require clear and reasonable warnings. The South Coast AQMD applies solvent cleaning rules that limit VOC emissions and require low-loss transfer methods, while SCAQMD Rule 301 imposes permitting thresholds for coating removal and solvent cleaning equipment. The compliance matrix below consolidates the core references that a California formulator or end user must maintain in its operating procedures and training records. The matrix is not a substitute for a full regulatory applicability determination, and site-specific engineering controls may be needed if exposure monitoring exceeds the action level.

Standard/regulation	Numerical limit or core requirement	Scope
29 CFR 1910.1052	25 ppm TWA, 125 ppm STEL, action level 12.5 ppm	Occupational exposure monitoring and medical surveillance
40 CFR 751.601–751.621	Prohibits consumer and most commercial paint removal; requires workplace chemical protection program	US TSCA risk management
ICH Q3C(R8)	Class 2 residual solvent limit 600 ppm	Pharmaceutical final dosage forms
FDA 21 CFR 173.222	Methylene chloride as food extraction solvent with residue controls	Decaffeinated coffee and spice extraction
8 CCR 5191	Occupational exposure monitoring, regulated area, and medical surveillance requirements	California workplaces

Pharmaceutical extractive and reaction-solvent operations are one demand segment that cannot be generalized across all methylene chloride users. The ICH Q3C(R8) Class 2 limit of 600 ppm applies to final dosage form residual solvent, so synthesis and extraction users operate wiped-film evaporators, agitated thin-film dryers and vacuum tray ovens with condenser outlet temperatures held below 10°C to recover methylene chloride and keep residual solvent within compendial limits. In extractive fractionation of temperature-sensitive natural products, methylene chloride is selected because heat input can be kept below 40°C during batch concentration, but the same low boiling point requires nitrogen blanketing and pressure-rated storage because vapor evolution at ambient temperatures above 30°C is rapid. The solvent’s high density relative to water, near 1.33 g/cm³, allows phase splitting in extractors but complicates decanter design because entrained aqueous droplets settle slowly if the organic phase is contaminated with surface-active compounds. In polycarbonate production, methylene chloride serves as the organic phase in the interfacial phosgene process, where bisphenol A disodium salt reacts with phosgene in a two-phase system; the methylene chloride phase must maintain low iron and low acidity to avoid polymer discoloration and chain termination. Polycarbonate producers often use internal methylene chloride recovery loops with distillation columns that return solvent to the phosgenation reactor, and the merchant market for polycarbonate grade is therefore limited relative to technical and pharmaceutical grades. Published data for the precise residual water specification in a given polycarbonate plant is limited, but the practical control range is generally below 50 ppm because water consumes phosgene and alters interfacial polymerization mass transfer.

Industrial immersion stripping of epoxy-polyurethane aircraft topcoats uses methylene chloride at 18–24°C in stainless steel or high-density polyethylene tanks with ventilation rates designed to maintain vapor concentrations below the OSHA action level. The solvent penetrates crosslinked coating films more rapidly than dibasic ester or benzyl alcohol formulations, but this same aggressive solvency requires that substrates be compatible with methylene chloride because the solvent can attack acrylic sealants, some elastomers, and certain plastic fittings if contact time is prolonged. Replacement of methylene chloride in aerospace immersion stripping is not simply a drop-in substitution because higher-boiling alternatives require process temperatures of 80–120°C and longer dwell times, which can change the fatigue characteristics of aluminum alloy skins if not validated. In vapor degreasing and electronics cleaning, methylene chloride is no longer the primary choice because of regulatory pressure and flammability-solvency tradeoffs in modern aqueous and semi-aqueous cleaning systems; however, certain legacy military and electronics specifications still reference it where the residue tolerance requires high solvency for heavy organic soils. In decaffeination and food extraction, methylene chloride is used under FDA 21 CFR 173.222 residue limits, and the solvent is recovered in closed-loop extractors with steam stripping and carbon adsorption. Process challenges in these extraction operations include solvent hydrolysis in the presence of moisture and the formation of trace acidic by-products that require neutralization and stabilizer monitoring.

Price Benchmarks Do Not Equal Delivered Transaction Values

Published price updates require careful interpretation because contract terms in the chlorinated solvents market often include index-linked formulas, co-product credits, terminal fees and returnable container charges. Public free-to-view market summaries for the most recent quarter indicate Asian dichloromethane export offers in the $450–$620/MT FOB range, North American Gulf Coast bulk contract indications between $0.38 and $0.60/lb, and European FD NWE values between €600 and €900/MT for technical-grade material, with drummed small-lot North American prices reported above $0.75/lb. These ranges are not executed transaction values and should not be used for financial settlement; price reporting agencies including ICIS, S&P Global Commodity Insights, OPIS and ChemAnalyst publish assessments that vary in frequency and methodology. The most recent publicly accessible updates show cost pressure from methanol and chlorine input values, stronger logistics costs for packaged material, and regional regulatory compliance premiums that are larger in California than in Gulf Coast terminal markets. For binding quotations, a buyer must request a current safety data sheet, certificate of analysis, and supplier delivery conditions because freight from US Gulf Coast to California terminals can add $0.08–$0.20/lb depending on mode and order size. The HS code 2903.12 should be declared with supplier CAS 75-09-2 and UN 1593 transport classification, Packing Group III, hazard class 6.1. Tariff treatment can shift under Section 301 exclusions for certain chlorinated solvents from China, and importers must submit commercial invoices, packing lists, certificates of analysis and bill of lading with the correct statistical suffix at entry. Public price summaries for methylene chloride do not capture the cost of regulatory training, exposure monitoring, vapor recovery equipment, or hazardous waste management, all of which are mandatory components of a California-compliant industrial operation. The distinction between a commodity price benchmark and a delivered, stabilized, documented, and compliance-bearing methylene chloride supply therefore remains central to procurement decisions, and published data for specific end-user transaction levels is limited because most large contracts are confidential between buyer and producer.