Citric Acid 50% Solution Technical Grade

Product Identifier

Citric Acid 50% Solution Technical Grade

Grade

Technical

Concentration

50%

CAS Number

77-92-9

Chemical Formula

C6H8O7

Molecular Weight

192.12 g/mol

Manufacturer

Alliance Chemical
204 South Edmond Street, Taylor, TX 76574

Emergency Phone

Chemtel 1-800-255-3924 (24/7)

Synonyms

Citric acid solution; 2-hydroxypropane-1,2,3-tricarboxylic acid (aqueous)

Recommended Use

Descaling and cleaning; pH adjustment; chelating agent in water treatment and formulations.

Restrictions on Use

Do not mix with bleach (hypochlorite) or other chlorine products. For industrial and professional use.

Classification

• Serious eye damage/eye irritation, Category 2A
• Specific target organ toxicity, single exposure, Category 3 (respiratory tract irritation)

Signal Word

Warning

Hazard Statements

• H319Causes serious eye irritation
• H335May cause respiratory irritation

Precautionary Statements

• P261Avoid breathing dust, fume, gas, mist, vapors or spray.
• P264Wash hands and face thoroughly after handling.
• P271Use only outdoors or in a well-ventilated area.
• P280Wear protective gloves, protective clothing, and eye/face protection.
• P304+P340IF INHALED: Remove person to fresh air and keep comfortable for breathing.
• P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
• P312Call a POISON CENTER or doctor if you feel unwell.
• P337+P313If eye irritation persists: Get medical advice or attention.
• P403+P233Store in a well-ventilated place. Keep container tightly closed.
• P405Store locked up.
• P501Dispose of contents and container in accordance with local, regional, national, and international regulations.

Classification, hazard (H) and precautionary (P) statements and pictograms per OSHA HCS 2024 (29 CFR 1910.1200, Appendices A–C), aligned with GHS Rev. 7.

Concentrations are nominal; lot-specific values appear on the Certificate of Analysis. Components not contributing to classification are omitted.

Eyes

Rinse with plenty of water for at least 15 minutes. Remove contact lenses if present and easy to do. Continue rinsing. Seek medical attention immediately.

Skin

Immediately flush with plenty of water for at least 15 minutes while removing contaminated clothing. Wash with soap. Get medical attention immediately.

Inhalation

Move person to fresh air and keep comfortable for breathing. If breathing is difficult, give oxygen. If not breathing, give artificial respiration. Get medical attention immediately.

Ingestion

Do Not Induce Vomiting! Never give anything by mouth to an unconscious person. If conscious, wash out mouth with water. Get medical attention immediately.

Most Important Symptoms and Effects

• Eye contact causes irritation: redness, pain and tearing.
• Inhalation may irritate the nose, throat and respiratory tract (coughing, sore throat).

Immediate Medical Attention and Special Treatment

• Treat symptomatically. Get medical attention if symptoms develop or persist.

Suitable Extinguishing Media

Use water spray, alcohol-resistant foam, dry chemical, or CO2. Use measures appropriate to local circumstances.

Unsuitable Extinguishing Media

Do not use a solid water stream as it may scatter and spread fire.

Specific Hazards Arising from the Chemical

Containers may rupture when heated.

Protective Equipment

Wear self-contained breathing apparatus and full protective clothing.

Hazardous Combustion Products

Carbon monoxide and carbon dioxide when the dried residue is heated strongly; hydrogen from contact with metals.

Personal Precautions

Use PPE as described in Section 8. Ensure adequate ventilation. Evacuate personnel to safe areas.

Environmental Precautions

Prevent leakage or spillage from entering drains, sewers, or waterways.

Containment & Cleanup

Absorb with inert material. Collect in appropriate waste container. Dispose per applicable regulations.

Safe Handling

Use with adequate ventilation. Avoid contact with skin, eyes, and clothing. Wash thoroughly after handling. Keep container closed when not in use.

Safe Storage

Store in a cool, dry, well-ventilated area. Keep away from incompatible materials (see Section 10). Keep containers tightly closed.

Specific Storage Precautions

Keep closed in plastic or stainless-steel containers, not mild steel. Protect from freezing; store away from bases and bleach.

Occupational Exposure Limits

No established occupational exposure limits.

Engineering Controls

Use adequate ventilation. Provide eyewash stations and quick-drench showers accessible to areas of use.

Eye/Face Protection

Wear chemical safety goggles or face shield.

Skin Protection

Wear chemical-resistant gloves and protective clothing.

Respiratory Protection

Use a NIOSH-approved respirator (N95/P100 for particulate, organic vapor or acid gas cartridge as appropriate to the substance) when exposure limits may be exceeded or visible mist or dust is generated.

Appearance

Transparent pale liquid, slightly viscous

Odor

Odorless to faint characteristic odor

Odor Threshold

No data available

pH

About 0.5–1.5

Melting Point / Freezing Point

Not characterized for the 50% solution

Boiling Point

100 to 105 °C (212 to 221 °F) (aqueous solution)

Flash Point

Not applicable

Evaporation Rate

No data available

Flammability (solid, gas)

No data available

Upper/Lower Flammability or Explosive Limits

No data available

Vapor Pressure

No data available

Vapor Density

No data available

Relative Density

No data available

Solubility

Completely miscible with water

Partition Coefficient (n-octanol/water)

log Kow -1.72 (citric acid)

Auto-ignition Temperature

No data available

Decomposition Temperature

About 175 °C (citric acid, after the water evaporates)

Viscosity

10–12 mPa·s (cP)

Particle Characteristics

Not applicable

Form

Liquid

Density

1.24 (50% w/w aqueous solution, 20 °C)

Values shown reflect product-specific canonical data. Lot-specific ranges may vary; see the Certificate of Analysis for the shipped lot.

Reactivity

Not reactive under normal conditions of use and storage.

Chemical Stability

Stable under recommended storage conditions.

Possibility of Hazardous Reactions

None under normal processing conditions.

Conditions to Avoid

Contact with incompatible materials; storage in mild-steel containers.

Incompatible Materials

Strong bases (heat); strong oxidizers and metal nitrates; bleach and other hypochlorites (release chlorine); reactive metals (release hydrogen). Slowly corrodes mild steel.

Hazardous Decomposition Products

Carbon monoxide and carbon dioxide when the dried residue is heated strongly; hydrogen from contact with metals.

See below for route-specific acute toxicity data.

Likely Routes of Exposure

Inhalation, skin contact, eye contact, ingestion.

Symptoms

• Eye contact causes irritation: redness, pain and tearing.
• Inhalation may irritate the nose, throat and respiratory tract (coughing, sore throat).

Delayed and Chronic Effects

• No delayed or chronic effects identified beyond the classification in Section 2.

Carcinogen Classification

Ecotoxicity

Daphnia EC50: 160 mg/L (48 h, Carcinus maenas (shore crab; crustacean, not Daphnia))

Persistence & Degradability

Not persistent — Readily biodegradable (66–67% ThBOD in 5 d)

Bioaccumulative Potential

log Kow −1.64, BCF 3 (estimated; low)

Mobility in Soil

Very high soil mobility (estimated Koc 10)

Dispose of contents/container in accordance with applicable federal, state, and local regulations. Do not dispose of into drains or waterways.

EPA RCRA Waste Codes

D002 (corrosive) when discarded: the solution has a pH of 2 or less (40 CFR 261.22). Not a P- or U-listed waste. Neutralize before disposal where permitted.

Not regulated for transport under US DOT 49 CFR Subchapter C, IMDG, or IATA DGR.

SARA 311/312 hazard categories correspond to the GHS classification in Section 2. Data retrieved as of: California Proposition 65 2026-10-02; US EPA TSCA Active Inventory 2026-10-02; EPCRA SARA 313 (TRI) 2026-10-02.

Revision Date

2026-10-08

Format

16-section format per OSHA HCS 2024 (29 CFR 1910.1200, Appendix D), aligned with GHS Rev. 7.