Calcium Nitrite

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Calcium Nitrite is an inorganic compound commonly supplied as a white crystalline powder or granules. It serves primarily as a corrosion inhibitor in reinforced concrete structures, protecting steel reinforcement from rust and prolonging structural lifespan. Calcium nitrite is also used in various industrial processes as an oxidizing agent and preservative. Due to its high solubility in water and strong oxidizing properties, it effectively prevents chloride-induced corrosion and improves concrete durability.

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Categories: Corrosion Inhibitors, Anti-Corrosion Agents Tags: Calcium nitrite, Cement accelerator, Concrete admixture, Construction chemical, Corrosion inhibitor for steel reinforcement, Grey or yellowish powder

Description

Table of Contents

Calcium Nitrite

Primary Uses

Construction & Civil Engineering
- Used as a corrosion inhibitor in reinforced concrete to protect steel rebars from chloride-induced corrosion.
- Added to concrete mixes to enhance durability and prevent premature deterioration, especially in marine and industrial environments.
- Helps in extending the service life of concrete structures such as bridges, tunnels, and parking garages.
Industrial Applications
- Employed as an oxidizing agent in various chemical manufacturing processes.
- Acts as a nitrosating agent and preservative in some industrial and food applications (subject to regulatory approval).

Secondary Uses

Water Treatment
- Used occasionally as a biocide and corrosion inhibitor in cooling water systems and boilers.
Agriculture
- Sometimes incorporated in fertilizers to provide nitrogen in nitrite form and improve nitrogen efficiency (limited use).

KEY PRODUCT FEATURES

1. Basic Identification Attributes

Chemical Name (IUPAC): Calcium dinitrite
Common/Trade Name: Calcium Nitrite
CAS Number: 13780-06-8
HS Code: 2834.29.00
Molecular Formula: Ca(NO₂)₂
Synonyms:
- Calcium dinitrite
- Calcium nitrite salt
- Calcium(II) nitrite

2. Physical & Chemical Properties

Physical State: Crystalline powder or granules
Color & Odor: White to off-white; odorless
Melting Point: Decomposes at ~400°C
Boiling Point: Not applicable (decomposes)
Density: Approx. 2.18 g/cm³ (anhydrous)
Solubility: Highly soluble in water (~81 g/100 mL at 20°C); insoluble in alcohol
pH: Slightly alkaline in aqueous solution (pH ~9–10)
Stability: Stable when dry; sensitive to moisture and heat

3. Safety & Hazard Attributes

Hazard Class (GHS): Oxidizing solid (Category 3); harmful if swallowed or inhaled
NFPA Ratings:
- Health: 2
- Flammability: 0
- Reactivity: 1
Exposure Limits: Avoid inhalation of dust; no specific OSHA PEL but general dust limits apply
Toxicity: Moderate toxicity; ingestion or inhalation may cause irritation to respiratory and digestive tracts
Reactivity: Strong oxidizer; reacts with reducing agents and combustible materials

4. Storage & Handling Attributes

Storage Conditions: Store in a cool, dry, well-ventilated area away from organic materials and acids
Container Type: Sealed polyethylene bags, drums, or bulk containers
Shelf Life: Typically 1–2 years under proper storage conditions
Special Handling: Use PPE; avoid dust formation and contact with incompatible substances

5. Regulatory & Compliance Attributes

FDA Status: Not approved as a food additive; used primarily in industrial applications
Transportation: Classified as an oxidizer (UN number 1446)
Waste Disposal: Follow local regulations for oxidizing chemical disposal

6. Environmental & Health Impact

Ecotoxicity: Potentially harmful to aquatic organisms in high concentrations
Persistence: Water-soluble and mobile in the environment; does not bioaccumulate
Carcinogenicity/Mutagenicity: Not classified as carcinogenic or mutagenic
Biodegradability: Inorganic compound; not biodegradable

SAFETY HANDLING PRECAUTIONS

Safety Handling Precautions

Personal Protective Equipment (PPE):

Gloves
Safety goggles
Dust mask or respirator (when handling powder)
Protective clothing

Handling Measures:

Avoid inhalation and ingestion
Work in well-ventilated areas
Avoid contact with incompatible materials (organic substances, acids)

Storage Measures:

Keep containers tightly sealed
Store away from moisture, heat, and reducing agents

Hygiene Practices:

Wash hands thoroughly after handling
Do not eat, drink, or smoke in handling areas

First Aid Measures

Inhalation: Move to fresh air; seek medical attention if respiratory irritation or difficulty occurs
Skin Contact: Wash affected area with soap and water; seek medical advice if irritation persists
Eye Contact: Rinse eyes with plenty of water for at least 15 minutes; seek medical attention if irritation continues
Ingestion: Do not induce vomiting; rinse mouth and seek immediate medical attention

Firefighting Measures

Fire Hazards: Supports combustion; strong oxidizer
Extinguishing Media: Use water spray, foam, or dry chemical extinguishers
Special Precautions: Firefighters should wear full protective gear and self-contained breathing apparatus (SCBA)
Decomposition Products: May release toxic nitrogen oxides and calcium oxides upon heating