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    Oxalic acid
    CAS No.: 144-62-7 Formula: C2H2O4 Molecular Weight: 90.03490
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    Oxalic acid

    CAS No.: 144-62-7 Formula: C2H2O4 Molecular Weight: 90.03490
    Suppliers: All (317) China Suppliers (237) Price Available (37) Contractor (51)


    Oxalic acid is an organic compound with the formula C2H2O4. It is a colorless crystalline solid that forms a colorless solution in water. Its condensed formula is HOOCCOOH, reflecting its classification as the simplest dicarboxylic acid. Its acid strength is much greater than that of acetic acid. Oxalic acid is a reducing agent and its conjugate base, known as oxalate (C 2O2? 4), is a chelating agent for metal cations. Typically, oxalic acid occurs as the dihydrate with the formula C2H2O4·2H2O. Excessive ingestion of oxalic acid or prolonged skin contact can be dangerous.

    Basic Info

    Chemical Name Oxalic acid

    Wood bleach; oxalic; Ethanedioic acid; BETZ 0295; DeerClean; Aktisal; Aquisal; Oxaalzuur; HOOCCOOH; Expand

    CAS No. 144-62-7
    Molecular Formula C2H2O4
    Molecular Weight 90.03490
    PSA 74.60000
    LogP -0.84440

    Numbering system

    EINECS number 205-634-3
    MDL number MFCD00002573
    RTECS number RO2450000
    BRN number 385686
    PubChem number 24886864


    Appearance & Physical State Odorless white solid
    Density 1.9
    Melting Point 189-191oC
    Flash Point 101-157oC
    Water Solubility 90 g/L (20 oC)
    Stability Stable, but moisture sensitive. Incompatible with metals.
    Vapor Density 4.4 (vs air)
    Vapor Pressure <0.01 mm Hg ( 20 °C)

    Safety Info

    RTECS RO2450000
    Hazard Class 8
    Safety Statements S24/25
    HS Code 2917111000
    Packing Group III
    WGK Germany 1
    RIDADR UN 3261
    Risk Statements R21/22
    Hazard Codes Xn
    Symbol GHS05, GHS07
    Signal Word Danger
    Hazard Declaration H302 + H312; H318
    Caution Statement P280; P301 + P312 + P330; P305 + P351 + P338 + P310
    SDS 1.0 Expand

    SDS 1.0

    Download/Modify | Technical supported by XiXisys.com. For US version, EU version (23 languages) and more, please refer to xixisys.com/en/sds/search


    According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

    Version: 1.0

    Creation Date: Aug 12, 2017

    Revision Date: Aug 12, 2017


    1.1 GHS Product identifier

    Product name oxalic acid

    1.2 Other means of identification

    Product number -
    Other names Aktisal

    1.3 Recommended use of the chemical and restrictions on use

    Identified uses For industry use only. Paint additives and coating additives not described by other categories,Photosensitive chemicals,Surface active agents
    Uses advised against no data available

    1.4 Supplier's details

    Company MOLBASE (Shanghai) Biotechnology Co., Ltd.
    Address Floor 4 & 5, Building 12, No. 1001 North Qinzhou Road,
    Xuhui District, Shanghai, China
    Telephone +86(21)64956998
    Fax +86(21)54365166

    1.5 Emergency phone number

    Emergency phone number +86-400-6021-666
    Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

    2.Hazard identification

    2.1 Classification of the substance or mixture

    Acute toxicity - Oral, Category 4

    Acute toxicity - Dermal, Category 4

    2.2 GHS label elements, including precautionary statements

    Signal word


    Hazard statement(s)

    H302 Harmful if swallowed

    H312 Harmful in contact with skin

    Precautionary statement(s)

    P264 Wash ... thoroughly after handling.

    P270 Do not eat, drink or smoke when using this product.

    P280 Wear protective gloves/protective clothing/eye protection/face protection.


    P301+P312 IF SWALLOWED: Call a POISON CENTER/doctor/…if you feel unwell.

    P330 Rinse mouth.

    P302+P352 IF ON SKIN: Wash with plenty of water/...

    P312 Call a POISON CENTER/doctor/…if you feel unwell.

    P321 Specific treatment (see ... on this label).

    P362+P364 Take off contaminated clothing and wash it before reuse.




    P501 Dispose of contents/container to ...

    2.3 Other hazards which do not result in classification


    3.Composition/information on ingredients

    3.1 Substances

    Chemical name Common names and synonyms CAS number EC number Concentration
    oxalic acid oxalic acid 144-62-7 none 100%

    4.First-aid measures

    4.1 Description of necessary first-aid measures

    General advice

    Consult a physician. Show this safety data sheet to the doctor in attendance.

    If inhaled

    Fresh air, rest. Half-upright position. Refer immediately for medical attention.

    In case of skin contact

    Remove contaminated clothes. Rinse skin with plenty of water or shower for at least 15 minutes. Refer for medical attention .

    In case of eye contact

    Rinse with plenty of water (remove contact lenses if easily possible). Refer immediately for medical attention.

    If swallowed

    Rinse mouth. Do NOT induce vomiting. Refer immediately for medical attention.

    4.2 Most important symptoms/effects, acute and delayed

    As dust or as a solution, can cause severe burns of eyes, skin, or mucous membranes. Ingestion of 5 grams has caused death with symptoms of nausea, shock, collapse, and convulsions coming on rapidly. Repeated or prolonged skin exposure can cause dermatitis and slow-healing ulcers. (USCG, 1999)

    4.3 Indication of immediate medical attention and special treatment needed, if necessary

    Treatment should be rapidly instituted by giving a dilute solution of calcium lactate, lime water, finely pulverized chalk, plaster, and/or milk to supply large amounts of calcium to inactivate oxalate by forming an insoluble calcium salt in the stomach. Gastric lavage is controversial, since this may compound an already severe corrosive lesion in the esophagus or stomach. However, if used, gastric lavage should be done with limewater (calcium hydroxide). Intravenous gluconate or calcium chloride solutions should be given to prevent hypocalcemic tetany; in severe cases parathyroid extract also has been given. ... Additionally, acute renal failure should be anticipated, and careful fluid management is necessary. /Oxalates/

    5.Fire-fighting measures

    5.1 Extinguishing media

    Suitable extinguishing media


    5.2 Specific hazards arising from the chemical

    Special Hazards of Combustion Products: Generates poisonous gases (USCG, 1999)

    5.3 Special protective actions for fire-fighters

    Wear self-contained breathing apparatus for firefighting if necessary.

    6.Accidental release measures

    6.1 Personal precautions, protective equipment and emergency procedures

    Use personal protective equipment. Avoid dust formation. Avoid breathing vapours, mist or gas. Ensure adequate ventilation. Evacuate personnel to safe areas. Avoid breathing dust. For personal protection see section 8.

    6.2 Environmental precautions

    Personal protection: particulate filter respirator adapted to the airborne concentration of the substance, protective gloves and safety goggles. Sweep spilled substance into covered plastic containers. If appropriate, moisten first to prevent dusting. Wash away remainder with plenty of water.

    6.3 Methods and materials for containment and cleaning up

    Cover with soda ash or sodium bicarbonate. Mix and add water. Neutralize and drain into a drain with sufficient water.

    7.Handling and storage

    7.1 Precautions for safe handling

    Avoid contact with skin and eyes. Avoid formation of dust and aerosols. Avoid exposure - obtain special instructions before use.Provide appropriate exhaust ventilation at places where dust is formed. For precautions see section 2.2.

    7.2 Conditions for safe storage, including any incompatibilities

    Separated from strong oxidants and food and feedstuffs. Dry. Well closed.STORE IN COOL, DRY, WELL-VENTILATED LOCATION. /OXALIC ACID DIHYDRATE/

    8.Exposure controls/personal protection

    8.1 Control parameters

    Occupational Exposure limit values

    Recommended Exposure Limit: 10 Hr Time-Weighted Avg: 1 mg/cu m.

    Recommended Exposure Limit: 15 Min Short-Term Exposure Limit: 2 mg/cu m.

    Biological limit values

    no data available

    8.2 Appropriate engineering controls

    Handle in accordance with good industrial hygiene and safety practice. Wash hands before breaks and at the end of workday.

    8.3 Individual protection measures, such as personal protective equipment (PPE)

    Eye/face protection

    Safety glasses with side-shields conforming to EN166. Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).

    Skin protection

    Wear impervious clothing. The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace. Handle with gloves. Gloves must be inspected prior to use. Use proper glove removal technique(without touching glove's outer surface) to avoid skin contact with this product. Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices. Wash and dry hands. The selected protective gloves have to satisfy the specifications of EU Directive 89/686/EEC and the standard EN 374 derived from it.

    Respiratory protection

    Wear dust mask when handling large quantities.

    Thermal hazards

    no data available

    9.Physical and chemical properties

    Physical state Odorless white solid
    Odour Odorless.
    Melting point/ freezing point 189-191oC
    Boiling point or initial boiling point and boiling range Sublimes (NIOSH, 2016)
    Flammability Combustible SolidCombustible. Gives off irritating or toxic fumes (or gases) in a fire.
    Lower and upper explosion limit / flammability limit no data available
    Flash point 101-157oC
    Auto-ignition temperature Not flammable (USCG, 1999)
    Decomposition temperature no data available
    pH no data available
    Kinematic viscosity no data available
    Solubility In water:90 g/L (20 oC)
    Partition coefficient n-octanol/water (log value) -0.81
    Vapour pressure <0.01 mm Hg ( 20 °C)
    Density and/or relative density 1.9
    Relative vapour density 4.4 (vs air)
    Particle characteristics no data available

    10.Stability and reactivity

    10.1 Reactivity

    no data available

    10.2 Chemical stability


    10.3 Possibility of hazardous reactions

    OXALIC ACID is hygroscopic and sensitive to heat. This compound may react violently with furfuryl alcohol, silver, sodium, perchlorate, sodium hypochlorite, strong oxidizers, sodium chlorite, acid chlorides, metals and alkali metals. . The heating of mixtures of Oxalic acid and urea has lead to explosions. This is due to the rapid generation of the gases CO2, CO, and NH3 [Praxis Naturwiss. Chem., 1987, 36(8), 41-42]. Oxalic acid and urea react at high temperatures to form toxic and flammable ammonia and carbon monoxide gases, and inert CO2 gas [Von Bentzinger, R. et al., Praxis Naturwiss. Chem., 1987, 36(8), 41-42].

    10.4 Conditions to avoid

    no data available

    10.5 Incompatible materials

    Reacts with strong alkalies, strong oxidizing materials, chlorites, and hypochlorites. /Oxalic acid dihydrate/

    10.6 Hazardous decomposition products


    11.Toxicological information

    Acute toxicity

    • Oral: LDLo Dog oral 1000 mg/kg
    • Inhalation: no data available
    • Dermal: no data available

    Skin corrosion/irritation

    no data available

    Serious eye damage/irritation

    no data available

    Respiratory or skin sensitization

    no data available

    Germ cell mutagenicity

    no data available


    no data available

    Reproductive toxicity

    no data available

    STOT-single exposure

    no data available

    STOT-repeated exposure

    no data available

    Aspiration hazard

    no data available

    12.Ecological information

    12.1 Toxicity

    • Toxicity to fish: no data available
    • Toxicity to daphnia and other aquatic invertebrates: no data available
    • Toxicity to algae: no data available
    • Toxicity to microorganisms: no data available

    12.2 Persistence and degradability

    Six tests at oxalic acid initial concns of 3.3 to 10 ppm exhibited 75 to 202 %BODT over an incubation period of 5 days in an aerobic screening study using sewage inoculum(1). A 78 and 55.5 %BODT for oxalic acid was measured under aerobic conditions over a period of 5 days in screening tests at 20°C using sewage inoculum(2). Oxalic acid at initial concns of 0.00375, 0.0375, and 0.375 ppm exhibited 95, 99, and 100% degradation, respectively, in an aerobic screening study at 25°C using sewage inoculum(3). In another screening study using sewage inoculum, 68 and 64 %BODT were measured for oxalic acid at initial concns of 10 and 20 ppm, respectively, over a 5 day incubation period(4). An 89 %BODT was measured for oxalic acid (10 ppm initial concn) in an aerobic screening study using sewage inoculum at 19.5-20.5°C over an incubation period of 5 days(5).

    12.3 Bioaccumulative potential

    Based on an average experimental water solubility of 220,000 mg/L at 25°C(1) and a regression derived equation(2), the BCF for oxalic acid can be estimated to be approximately 0.6(SRC) and therefore should not be expected to bioconcentrate in aquatic organisms(SRC).

    12.4 Mobility in soil

    Based on an average experimental water solubility of 220,000 mg/L at 25°C(1) and a regression derived equation(2), the Koc for undissociated oxalic acid can be estimated to be approximately 5. This Koc value indicates that oxalic acid will have very high mobility in soil(3); therefore, adsorption to soil and sediment may not be an important fate process. Based on pKa1 and pKa2 values of 1.25 and 4.28(4) respectively, oxalic acid will exist primarily as the oxalate ion under environmental conditions (pH 5-9). No experimental data are available to determine whether the oxalate ion will adsorb to sediment or soil more strongly than its estimated Koc value indicates(SRC).

    12.5 Other adverse effects

    no data available

    13.Disposal considerations

    13.1 Disposal methods


    The material can be disposed of by removal to a licensed chemical destruction plant or by controlled incineration with flue gas scrubbing. Do not contaminate water, foodstuffs, feed or seed by storage or disposal. Do not discharge to sewer systems.

    Contaminated packaging

    Containers can be triply rinsed (or equivalent) and offered for recycling or reconditioning. Alternatively, the packaging can be punctured to make it unusable for other purposes and then be disposed of in a sanitary landfill. Controlled incineration with flue gas scrubbing is possible for combustible packaging materials.

    14.Transport information

    14.1 UN Number

    ADR/RID: Not dangerous goods. IMDG: Not dangerous goods. IATA: Not dangerous goods.

    14.2 UN Proper Shipping Name

    ADR/RID: unknown
    IMDG: unknown
    IATA: unknown

    14.3 Transport hazard class(es)

    ADR/RID: Not dangerous goods. IMDG: Not dangerous goods. IATA: Not dangerous goods.

    14.4 Packing group, if applicable

    ADR/RID: Not dangerous goods. IMDG: Not dangerous goods. IATA: Not dangerous goods.

    14.5 Environmental hazards

    ADR/RID: no IMDG: no IATA: no

    14.6 Special precautions for user

    no data available

    14.7 Transport in bulk according to Annex II of MARPOL 73/78 and the IBC Code

    no data available

    15.Regulatory information

    15.1 Safety, health and environmental regulations specific for the product in question

    Chemical name Common names and synonyms CAS number EC number
    oxalic acid oxalic acid 144-62-7 none
    European Inventory of Existing Commercial Chemical Substances (EINECS) Listed.
    EC Inventory Listed.
    United States Toxic Substances Control Act (TSCA) Inventory Listed.
    China Catalog of Hazardous chemicals 2015 Not Listed.
    New Zealand Inventory of Chemicals (NZIoC) Listed.
    Philippines Inventory of Chemicals and Chemical Substances (PICCS) Listed.
    Vietnam National Chemical Inventory Listed.
    Chinese Chemical Inventory of Existing Chemical Substances (China IECSC) Listed.

    16.Other information

    Information on revision

    Creation Date Aug 12, 2017
    Revision Date Aug 12, 2017

    Abbreviations and acronyms

    • CAS: Chemical Abstracts Service
    • ADR: European Agreement concerning the International Carriage of Dangerous Goods by Road
    • RID: Regulation concerning the International Carriage of Dangerous Goods by Rail
    • IMDG: International Maritime Dangerous Goods
    • IATA: International Air Transportation Association
    • TWA: Time Weighted Average
    • STEL: Short term exposure limit
    • LC50: Lethal Concentration 50%
    • LD50: Lethal Dose 50%
    • EC50: Effective Concentration 50%


    • IPCS - The International Chemical Safety Cards (ICSC), website: http://www.ilo.org/dyn/icsc/showcard.home
    • HSDB - Hazardous Substances Data Bank, website: https://toxnet.nlm.nih.gov/newtoxnet/hsdb.htm
    • IARC - International Agency for Research on Cancer, website: http://www.iarc.fr/
    • eChemPortal - The Global Portal to Information on Chemical Substances by OECD, website: http://www.echemportal.org/echemportal/index?pageID=0&request_locale=en
    • CAMEO Chemicals, website: http://cameochemicals.noaa.gov/search/simple
    • ChemIDplus, website: http://chem.sis.nlm.nih.gov/chemidplus/chemidlite.jsp
    • ERG - Emergency Response Guidebook by U.S. Department of Transportation, website: http://www.phmsa.dot.gov/hazmat/library/erg
    • Germany GESTIS-database on hazard substance, website: http://www.dguv.de/ifa/gestis/gestis-stoffdatenbank/index-2.jsp
    • ECHA - European Chemicals Agency, website: https://echa.europa.eu/

    Disclaimer: The above information is believed to be correct but does not purport to be all inclusive and shall be used only as a guide. The information in this document is based on the present state of our knowledge and is applicable to the product with regard to appropriate safety precautions. It does not represent any guarantee of the properties of the product. We as supplier shall not be held liable for any damage resulting from handling or from contact with the above product.
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    Column type Active phase Temperature (°C) Retention Index (I) Temperature Control Method
    Capillary RTX-5 - 748. temperature ramp
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