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Jasco Methylene Chloride
- Product Name: Jasco Methylene Chloride
- Factroy Site: Binhai New Area, Tianjin, China
- Price Inquiry: sales4@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- In terms of specification, Jasco Methylene Chloride is supplied with high active methylene chloride concentration and a non-drip gel viscosity, making it suitable for heavy-duty removal of paint, varnish, and epoxy from wood and metal surfaces.
| HS Code | 501630 |
| Chemical Name | Methylene Chloride |
| Cas Number | 75-09-2 |
| Molecular Formula | CH2Cl2 |
| Molecular Weight | 84.93 g/mol |
| Appearance | Clear, colorless liquid |
| Odor | Sweet, chloroform-like |
| Purity | ≥99.5% |
| Density | 1.33 g/cm³ at 20°C |
| Boiling Point | 39.6°C |
| Melting Point | -96.7°C |
| Solubility In Water | 20 g/L at 20°C |
| Vapor Pressure | 47.4 kPa at 20°C |
| Flash Point | None |
As an accredited Jasco Methylene Chloride factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Jasco Methylene Chloride is packaged in a 1-gallon metal can with a resealable lid, featuring prominent safety warnings and usage instructions. |
| Container Loading (20′ FCL) | Loading a 20′ FCL of Jasco Methylene Chloride involves securing drums upright, bracing cargo, ensuring ventilation, and following hazardous material transport regulations. |
| Shipping | Jasco Methylene Chloride ships as a hazardous material (UN1593, Class 6.1) in tightly sealed, approved containers with proper labels and documentation. Transport requires secure, upright packaging, adequate ventilation, and compliance with DOT/IATA/IMDG regulations to prevent leaks, vapor exposure, and environmental contamination. Ship via ground freight unless expedited air transport is specifically authorized. |
| Storage | Store Jasco Methylene Chloride in a tightly sealed, original container in a cool, dry, well-ventilated area. Keep away from heat, sparks, open flames, and direct sunlight. Separate from incompatible substances like strong oxidizers. Ensure the storage area is properly grounded and accessible, and always follow manufacturer and safety datasheet instructions. |
| Shelf Life | Shelf life is approximately 3–5 years if stored tightly sealed, away from heat, moisture, and sunlight in original container. |
Continuous flexible slabstock lines using Jasco methylene chloride as an auxiliary physical blowing agent meter the solvent into the polyol premix, never into the isocyanate stream, because the water-isocyanate reaction exotherm supplies the latent heat required for vaporization at 39.8°C. The loading window lies between 3 pphp and 8 pphp (parts per hundred polyol by mass), replacing a portion of water to achieve target densities in the 14–22 kg/m³ range for mattress and carpet underlay grades. Regulatory controls include 40 CFR Part 63 Subpart III for flexible polyurethane foam production and 29 CFR 1910.1052 for methylene chloride exposure, with an 8-hour time-weighted average of 25 ppm and a short-term exposure limit of 125 ppm; EU downstream users must also document risk management measures under REACH exposure scenarios for dichloromethane.
Production-scale Maxfoam or trough lines running at 2.5–5.0 m/min conveyor speed and block heights up to 1.0 m control the internal block exotherm within 150–170°C; excessive DCM loading produces delayed exotherm and core splitting, while insufficient loading yields density gradients and surface collapse. Batch-to-batch variance occurs when the bulk solvent exceeds 25°C and vapor pressure rises to 58 kPa, causing metering pump cavitation and density drift of ±1.5 kg/m³ across a two-ton block; storage at 15–20°C under 0.15–0.25 bar nitrogen blanket prevents this. Terminal finished product types include flexible polyurethane foam blocks converted into mattress cores, furniture seat cushions, and carpet underlay, with subsequent slitting, convoluting, and lamination.
What Governs Stabilizer Selection in Immersion Paint-Stripping Formulations?
Industrial coating removal with Jasco methylene chloride is restricted to qualified professional use under EU REACH Annex XVII Entry 59 as amended by Regulation (EU) 2019/1148 and US EPA 40 CFR 751.105; consumer and retail distribution is prohibited in both jurisdictions. Formulation ratios place the dichloromethane concentration between 60 wt% and 80 wt%, with 0.5–2.0 wt% paraffin wax as a vapor-suppressing film, 0.5–2.0 wt% hydroxypropyl methylcellulose or ethyl cellulose as thixotropic thickener, 2–10 wt% methanol as co-solvent, and 0.1–0.5 wt% corrosion inhibitor. The stabilizer package is formulation-critical because dichloromethane hydrolyzes in the presence of free water to form trace hydrochloric acid, which accelerates substrate corrosion and destabilizes the wax layer. In immersion tanks fabricated from 316L stainless steel or polypropylene, the working temperature is maintained at 20–25°C, not elevated, to keep the DCM partial pressure low and extend phase-contacting time. High-pressure airless spray application on vertical aerospace and structural steel surfaces uses a 45:1 or 60:1 pump ratio with a fan tip of 0.015–0.021 inch, yielding a wet film thickness of 250–500 µm that must remain undisturbed for 15–60 min until coating failure occurs by solvent diffusion, film swelling, and mechanical delamination. Production lines handling steel bridge modules or aircraft components operate with forced-air extraction of 80–120 m³/min per booth and require air monitoring at the workplace boundary to remain below the 25 ppm 8-hour TWA. Terminal finished product types include stripped steel bridge panels, aircraft fuselage skins, automotive body-in-white components, and cast aluminum engine parts, with subsequent surface profiling before repainting.
Pharmaceutical Extraction Solvent and Residue Control Under ICH Q3C
Jasco methylene chloride enters pharmaceutical process development as a water-immiscible extraction solvent for alkaloid, corticosteroid, and antibiotic isolation streams. The binding compliance documents are ICH Q3C(R8) for residual solvents, under which dichloromethane is a Class 2 solvent with a permitted daily exposure of 6.0 mg/day and a concentration limit of 600 ppm in the final drug substance; 21 CFR 211.170 and EU GMP Annex 8 govern solvent handling and batch documentation. The extraction charge is not a fixed formula ratio but a process-derived ratio; typical liquid-liquid extraction operations use 5–10 L of methylene chloride per kg of crude aqueous alkaloid solution, while multistage countercurrent trains reduce specific consumption to 2–4 L/kg crude isolate. In a standard cGMP suite, the extraction is run in a glass-lined or Hastelloy C-22 reactor at 15–30°C, with phase separation time of 20–45 min after agitation at 150–250 rpm. The rich DCM phase is then concentrated in a wiped-film or climbing-film evaporator with jacket temperature not exceeding 50°C and vacuum set to 450–550 mbar; higher jacket temperatures in the presence of primary amines lead to carbamate formation and elevated total related substances. Residual DCM in the final API is driven below the 600 ppm limit by vacuum drying at 35–40°C for 12–24 h or by nitrogen stripping in an agitated filter dryer. Production-scale failure modes observed on contract manufacturing lines include emulsion formation in alkaline conditions, carryover of DCM into crystallizers causing amorphous contamination, and batch-to-batch residual solvent drift when the dryer vacuum pump condensate return fails. Terminal finished product types include opioid alkaloids, steroid APIs, macrolide antibiotics, and synthetic intermediates that are crystallized from DCM-containing solvent systems after extraction and solvent exchange.
In open-top and vacuum vapor degreasing lines, stabilized Jasco methylene chloride is maintained at 99.5 wt% minimum with a stabilizer package of 0.2–0.5 wt%, water below 100 ppm, and acid acceptance above 0.05 wt% NaOH equivalent to prevent hydrochloric acid formation. The degreaser operates with a boil sump at 39.8°C, a freeboard ratio of 0.75:1 or greater, and cooling coils at –5°C to 5°C; parts are held in the vapor for 1–5 min after an optional ultrasonic immersion stage at 35–38°C with 20–40 kHz excitation. Compliance under 40 CFR Part 63 Subpart T and 29 CFR 1910.1052 requires idling-mode cover closure, working-mode ventilation control, and air monitoring below the 25 ppm 8-hour TWA. Terminal finished product types include stainless steel surgical instruments, aerospace fasteners, precision ball bearings, hydraulic valve bodies, and oxygen-service brass components. The process boundary is narrow: stabilizer depletion or water ingress above 200 ppm drops acid acceptance below 0.02 wt% and initiates corrosion of steel and aluminum parts.
When Polycarbonate and Acrylic Fabricators Require Cold-Welding Solvent Cement
For transparent acrylic and polycarbonate assemblies, Jasco methylene chloride acts as the primary active solvent in air-drying solvent cement formulations because it dissolves the amorphous polymer surface and permits interdiffusion of polymer chains without a separate adhesive film. In acrylic cement, the methylene chloride content is held between 70 wt% and 85 wt%, with 10–20 wt% methyl methacrylate monomer for gap filling, 3–8 wt% acrylic polymer resin for viscosity build to 2500–8000 cP, and 50–100 ppm hydroquinone monomethyl ether to prevent premature monomer polymerization in storage. Polycarbonate cements operate with 60–75 wt% dichloromethane, 15–25 wt% ethylene dichloride, and 2–6 wt% polycarbonate resin; the ethylene dichloride slows evaporation to reduce stress crazing around holes and notches. Bonding equipment consists of pneumatic dispensers running at 0.1–0.5 MPa and jigs applying 0.05–0.2 MPa closure pressure; capillary action draws cement into a joint gap of 0.2–0.5 mm, and the solvent is allowed to evaporate for 24–72 h at 20–25°C and 35–50% RH. Medical device fabricators subject bonded polycarbonate components to ISO 10993-1 biocompatibility evaluation and ISO 10993-18 chemical characterization to establish that residual dichloromethane and ethylene dichloride fall below device-specific allowable limits; occupational exposure remains under 29 CFR 1910.1052 and EU occupational exposure limits. On production lines, the main failure mode is moisture-induced blushing when relative humidity exceeds 60% during cure, causing local opacity at the joint; another is stress cracking when aromatic solvents or amine-bearing cleaning agents contact the bonded polycarbonate during post-processing. Terminal finished product types include acrylic display cases, orthotic splints, polycarbonate medical device housings, clear laboratory manifolds, and edge-polished acrylic signage.
R-32 Fluorination Output Depends on Chloride Balance Control at the Vapor-Phase Chromium Oxyfluoride Catalyst
Jasco methylene chloride serves as the C1 feedstock for catalytic fluorination to difluoromethane (HFC-32), in which the stoichiometric hydrofluoric acid-to-dichloromethane molar ratio is 2.0:1.0 and the plant operates with an HF excess of 2.05:1 to 2.20:1 to maintain single-pass conversion above 98%. The feedstock ratio is managed by mass-flow controllers with a DCM moisture specification of <10 ppm and a sulfur content below <5 ppm; higher moisture deactivates the chromium oxyfluoride catalyst and increases corrosion in downstream HCl recovery. The reaction is run in a fixed-bed reactor charged with chromium oxyfluoride on fluorinated alumina, at 200–350°C and 0.8–1.2 MPa, followed by water scrubbing, alkaline neutralization, drying, and fractional distillation to produce refrigerant-grade HFC-32 at 99.99 wt%. Process equipment in the HCl-recovery loop is specified in Hastelloy C-276 or PTFE-lined carbon steel because the mixed acid stream contains hydrofluoric, hydrochloric, and trace fluorinated organic species. Compliance for the plant includes 40 CFR Part 98 Subpart O greenhouse gas reporting for HFC production, ASME B31.3 process piping, 29 CFR 1910.1052 for DCM handling, and EU F-gas Regulation (EU) No 517/2014 for downstream refrigerant phase-down. Terminal finished product types include pure R-32, plus blends such as R-410A containing 50 wt% R-32 and 50 wt% R-125, and R-454B containing 68.9 wt% R-32 and 31.1 wt% R-1234yf. Operational boundaries include avoiding aqueous contamination in the DCM feed, because liquid water entering a mixed HF reactor can create a runaway exotherm and rapid pressure rise.
Green coffee beans destined for solvent decaffeination with Jasco methylene chloride are premoistened to a water content of 30–40 wt% before being loaded into 316L stainless steel countercurrent extraction columns, where the solvent is circulated at 2–4 bed volumes per hour for 8–12 h and the solvent-to-bean mass ratio is held at 0.8–1.5:1 per batch. The extraction temperature is maintained at 30–40°C, below the normal boiling point to limit vapor emissions, and the miscella is drained from the column base before dichloromethane recovery by steam distillation at 90–100°C and activated-carbon adsorption of exhaust vapors. Regulatory compliance in this application hinges on 21 CFR 173.222, which sets a residual dichloromethane limit of 10 ppm in decaffeinated roasted coffee, and EU Directive 2009/32/EC Annex I Part II, which likewise applies a 10 mg/kg maximum residue in the final coffee product. Users of the solvent must also maintain food-grade lot identity under ISO 22000 food safety management and prevent cross-contact with non-food-grade DCM. The primary processing failure mode on decaffeination lines is incomplete solvent stripping from the bean matrix when steam pressure fluctuates below 2.5 bar or when the coffee bed packs to an excessive pressure drop above 0.5 bar; this is corrected by maintaining a uniform bean size distribution of 5.5–7.0 mm through screening before extraction. Terminal finished product types include decaffeinated green coffee for roasting, decaffeinated roasted whole bean and ground coffee, and solvent-extracted tea leaves where the same equipment train is qualified for tea decaffeination.
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- Jasco Methylene Chloride is manufactured under an ISO 9001 quality system and complies with relevant regulatory requirements.
- COA, SDS/MSDS, and related certificates are available upon request. For certificate requests or inquiries, contact: sales4@ascent-chem.com.
Jasco Methylene Chloride is a methylene chloride-based coating removal solvent distributed by W.M. Barr & Company for professional and industrial surface preparation. The product is identified on the safety data sheet as a liquid mixture in which methylene chloride, CAS 75-09-2, is the primary volatile component; current SDS documents list the methylene chloride concentration in the 80–100% by weight range. It is supplied as a clear, colorless, low-viscosity fluid rather than as a thickened paste remover, and is packaged in metal cans and drums to avoid the permeation and solvent attack encountered with many polymer containers. Physical properties used for process design include a boiling point of 39.8°C at 101.3 kPa, a specific gravity of 1.32 at 20°C, and a vapor pressure of 46.5 kPa at 20°C, which produces a vapor density approximately 2.93 times that of air. The product is not classified as flammable under ASTM D56 closed-cup conditions; however, the high vapor density and low boiling point create a pronounced vapor-accumulation hazard in low-lying process areas. As a result, the product is used primarily in controlled industrial settings, not in consumer paint removal.
Neat methylene chloride has a water solubility of 13 g/L at 20°C, so phase separation in wet dip tanks can lead to a water-rich layer under the solvent. The autoignition temperature of methylene chloride is 556°C, and flammable vapor mixtures are reported in the range of 14–22% v/v in air at 25°C. Although the product is nonflammable under ordinary room conditions, welding or open flames should be kept away from closed containers. Technical-grade methylene chloride may contain an oxidation stabilizer; the Jasco product SDS does not list a resin or wax package, but users should verify lot-specific stabilizer identity before using it as a chemical intermediate or analytical solvent.
The product line is not divided into separate resin grades; it is a single methylene chloride solvent grade with the SDS product code as the batch identifier. Commercial packaging in 1 gal (3.79 L) and 5 gal (18.9 L) metal cans is common, with 55 gal (208 L) drums for continuous immersion lines. Because methylene chloride permeates polyethylene and can stress-crack many plastics, metal or fluoropolymer-lined containers are required. The product differs from Jasco paste-type paint removers in both viscosity and evaporation rate; the low-viscosity form is suited to dip-tank recirculation but not to consumer open-brush use unless ventilation and worker protection measures are in place.
What Solvent Flux Is Achievable at Ambient Immersion Temperatures?
In immersion stripping of steel and stainless steel hardware carrying baked alkyd, epoxy-ester, or polyurethane films, the product is typically maintained at 18–25°C. Heating is generally not required because the solvent’s vapor pressure at 20°C is already 46.5 kPa, and external heating increases vapor emissions without proportionally accelerating film lift on partially cured thermoset networks. A covered steel dip tank with rim ventilation and a condensing freeboard is the usual production configuration. Low-turbulence recirculation of 0.3–0.5 m/min linear velocity across the part surface removes solvent boundary layers that become saturated with polymer degradation products. Under these conditions, a 200–400 µm dry-film alkyd coating typically lifts within 15–35 min, while a high-crosslink two-component epoxy film may require 45–90 min at the same temperature. These values are typical ranges for methylene chloride-based immersion strippers; published data for this specific Jasco formulation at all film thicknesses is limited, so adhesion tape testing according to ASTM D3359 or cross-cut testing according to ISO 2409 should be used to confirm complete removal.
On ferrous castings with blind holes and threaded recesses, air pockets can prevent contact; fixtures should be rotated or tanks agitated to release trapped air. On parts with brazed joints, pre-testing is required because residual flux can react with the solvent and cause staining. In high-production immersion lines, batch-to-batch variance in coating thickness can require dwell-time adjustments of 10–15 min; processors therefore monitor coating lift visually and with adhesion-test pulls rather than relying on a single fixed dwell time.
For brush application on vertical architectural millwork, solvent retention is more important than solvent flux. Because methylene chloride evaporates rapidly, exposed films cool below ambient and can condense moisture, reducing penetration. Users therefore apply the product as a wet film and cover the area with polyethylene sheeting to reduce vapor loss. The covering step raises the local solvent concentration and maintains swelling pressure against the coating. On latex, alkyd, and conventional varnish systems, lifting may occur within 5–15 min; on epoxy and catalyzed urethane films, dwell times extend to 30–60 min. The product is not advised for use over asbestos-containing floor tiles or over surfaces that cannot be neutralized and coated after stripping.
The action is governed by diffusion rather than simple dissolution. Methylene chloride has a small molar volume of approximately 64 cm³/mol and a dipole moment of 1.60 D, which favors penetration into polar and hydrogen-bonded coating layers. Once the solvent diffuses through the film, it swells the polymer, reduces internal stress, and promotes cleavage at the coating-substrate interface. Because the product is mostly solvent, reapplication is required if the surface is allowed to dry; thickened paste systems maintain wet contact for longer but do not penetrate as rapidly.
| Active solvent system | Vapor pressure at 20°C | Boiling point at 101.3 kPa | Primary regulatory boundary | Typical covered brush dwell on aged epoxy |
|---|---|---|---|---|
| Jasco Methylene Chloride | 46.5 kPa | 39.8°C | OSHA 29 CFR 1910.1052; EPA 40 CFR 751 | 30–60 min |
| Benzyl alcohol stripper | ~0.013 kPa | 205°C | No chlorinated solvent-specific OSHA exposure limit | 4–24 h |
| N-Methyl-2-pyrrolidone stripper | ~0.033 kPa | 202°C | REACH Annex XVII restrictions in certain applications; classified as reprotoxic | 2–12 h |
Table 1 refers to the active solvent properties, not a complete formulation equivalence. Formulation-specific adhesion tests remain necessary before selecting a stripper for production use.
Vapor-Phase Control and Worker Chemical Protection Boundaries
Because the product’s vapor pressure is high, airborne concentrations in a stripping room can exceed the OSHA permissible exposure limit of 25 ppm as an 8-hour time-weighted average and the short-term exposure limit of 125 ppm over 15 min unless engineering controls are installed. The action level is 12.5 ppm. Under OSHA 29 CFR 1910.1052, employers must implement exposure monitoring, medical surveillance, and respiratory protection when exposures exceed the action level. In dip-tank service, rim ventilation should be balanced to maintain inward airflow across the tank opening and prevent vapor spillage into the operator’s breathing zone. For enclosed brush benches and immersion enclosures, local exhaust ventilation is commonly designed to achieve a capture velocity of 0.5 m/s at the work surface. Users should not rely on odor thresholds as a control measure, because methylene chloride odor may not be detectable at safe concentrations.
Under the EPA methylene chloride regulation at 40 CFR 751, consumer paint and coating removal is restricted, and professional use is conditional on a Worker Chemical Protection Program. This program includes initial and periodic air monitoring, engineering controls, respiratory protection, and recordkeeping. In practical production settings, air sampling is performed with a charcoal tube and analyzed according to NIOSH 1005 or equivalent methods. The product is therefore not interchangeable with non-chlorinated consumer paint removers; the compliance burden is greater and the permissible use environments are more restricted.
| Requirement | Standard or code | Basis |
|---|---|---|
| Occupational exposure limit | OSHA 29 CFR 1910.1052 | 25 ppm 8-hr TWA; 125 ppm 15-min STEL; action level 12.5 ppm |
| Consumer paint removal restriction | EPA 40 CFR 751 Subpart B | Prohibits consumer sale; requires Worker Chemical Protection Program for commercial use |
| Flash point evaluation | ASTM D56 | No closed-cup flash point under standard test conditions; vapor decomposition at high temperature is a separate hazard |
| Coating removal verification | ASTM D3359; ISO 2409 | Cross-cut adhesion testing before recoating |
| Air sampling | NIOSH 1005 | Charcoal tube sampling and GC analysis for methylene chloride |
The principal difference between Jasco Methylene Chloride and non-chlorinated Jasco removers is process speed versus regulatory burden. Benzyl alcohol and dibasic ester formulations remain wet longer and are accepted in many consumer-accessible applications, but their dwell times on crosslinked epoxy films frequently exceed 4 h and may require heated enclosures or repeated scraping. In contrast, Jasco Methylene Chloride delivers ambient-temperature film lift but requires air monitoring, engineered ventilation, and operator training under 29 CFR 1910.1052. For high-volume metal refinishing lines, the faster dwell time can justify the extra environmental controls; for low-frequency building maintenance, a non-chlorinated alternative may be more practical.
Storage stability is evaluated by water content and acidity; methylene chloride can slowly hydrolyze in the presence of water and light, producing hydrochloric acid. Drums should remain closed below 30°C and away from direct sunlight. Carbon steel drums with phenolic or epoxy-phenolic linings are common; moisture ingress should be prevented because acid formation accelerates liner degradation and can raise chloride contamination on processed parts.
Jasco Methylene Chloride is not a universal substrate strip. Its compatibility with ferrous metal is good, but direct contact with aluminum, zinc, magnesium, and galvanized surfaces is not recommended when water or acidic byproducts are present because localized corrosion can develop. In one class of production failures observed on methylene chloride-based immersion lines, zinc-plated brackets developed white rust and pitting after prolonged contact at 26°C in a poorly dried tank; the failure was attributed to chlorinated solvent-water interaction rather than the coating itself. Published data for this specific Jasco product on zinc or aluminum substrates is limited, but the substitution of a non-chlorinated stripper or mechanical abrasion is standard practice in these cases. For gel-coated fiberglass, contact time should be limited to 15 min or less on an inconspicuous test area because methylene chloride can attack unsaturated polyester resin.
When Elastomeric Seals and Pump Components Are Specified for Continuous Duty
Continuous circulation of methylene chloride-based stripper in dip tanks exposes pump elastomers, impellers, and shaft seals to both solvent attack and vapor-lock. Centrifugal pumps with mechanical seals can lose prime when the solvent temperature rises above 25°C because the product begins to vaporize on the suction side. For this reason, air-operated double-diaphragm pumps with PTFE wetted bodies and PTFE diaphragms are used in many production installations. EPDM, nitrile, and natural rubber seals are generally unsuitable for prolonged contact; perfluoroelastomer or PTFE-encapsulated seals are specified after compatibility testing. In a continuous immersion line, a suction-side positive pressure is maintained by elevating the drum or using a flooded inlet, and a return line is routed below the liquid surface to reduce free fall and aerosol formation. Users should also avoid clear PVC sight glasses because methylene chloride can induce stress cracking in rigid PVC; borosilicate sight tubes or PTFE-lined flow meters are more appropriate.
Atomized spray is not recommended for open-shop use because the aerosolized droplets increase inhalation exposure and generate solvent mist that defeats standard vapor controls. If spray application is required, a fully enclosed spray cabinet with vapor capture and continuous monitoring is used. The product is not a general-purpose degreaser; its use should be restricted to coating removal on substrates whose dimensional and surface requirements are compatible with chlorinated solvent contact.
On steel that is to be powder coated or liquid coated after stripping, residual methylene chloride should be removed by forced air drying at 60–80°C for 20–30 min or by solvent wiping with a low-residue ketone. Because the product can leave trace chloride, water-soluble salt testing before coating is carried out according to ISO 8502-6 where service conditions require cleanliness. Waste from stripping operations should be evaluated under RCRA 40 CFR 261; discarded methylene chloride is identified as listed waste code U080 when it meets the listing criteria. Spent solvents, sludges, and contaminated wipes must be handled through a licensed hazardous waste program and not disposed of through sanitary drains or municipal trash.