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Chelating Agents

Citric acid

CAS: 77-92-9

Overview

Citric acid (CAS 77-92-9 ), also designated E330 in food and beverage applications, is a multi-functional organic acid used across food, pharmaceutical, personal care, and industrial sectors.

It controls pH, chelates metal ions, and acts as an acidulant and preservative in a broad range of formulations. In food and beverage manufacturing, it acidifies soft drinks, confectionery, and preserved foods.

This ingredient extends shelf life by inhibiting oxidation. Pharmaceutical formulators rely on it to buffer effervescent tablets, oral solutions, and topical preparations where precise pH stability is critical to performance.

In personal care, it adjusts pH in shampoos, creams, and rinse-off products. Its chelating action neutralizes hard water minerals that would otherwise destabilize emulsions or affect the clarity of the final product.

Water treatment operations use it to sequester calcium and heavy metal ions. This prevents scale formation in industrial systems and cleaning-in-place circuits, ensuring efficient maintenance of high-value equipment.

The product is supplied as a white crystalline powder or granules in both anhydrous and monohydrate forms. Standard grades include FCC , USP , BP , Ph.Eur. , and technical grade options.

These grades cover food, pharmaceutical, and industrial procurement requirements. Bulk quantities are typically available in 25 kg bags or big bags, with food-grade and pharma-grade material supplied under full documentation.

Every shipment includes a CoA and origin certification to ensure compliance with global safety regulations. This ensures that the material meets the rigorous demands of modern manufacturing and supply chain standards.

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Physical Properties

Melting Point153 °C
Boiling Point310 °C (decomp)
Density1.665 g/cm³ @ Temp: 20 °C
Flash Point100 °C
AppearanceWhite crystalline powder
ColorWhite
OdorOdorless
Formgrit
Water Solubility750 g/L (20 ºC)
Vapor Pressure<0.1 hPa (20 °C)
Refractive Index1.493~1.509
pH1.0-2.0 (25℃, 1M in H2O)
Log P-1.64

Safety & Handling

Warning GHS07 Hazard Statements H315 Causes skin irritation H319 Causes serious eye irritation H335 May cause respiratory irritation Precautionary Statements P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P271 Use only outdoors or in a well-ventilated area. P280 Wear protective gloves/protective clothing/eye protection/face protection. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P332+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code2918 14 00
UN Number1789
ADR Class8
Packing GroupIII
Storage Class11 - Combustible Solids
WGK (Germany)1

Other Names

H3cit | E 330 | beta-hydroxytricarballylic acid | 3-carboxy-3-hydroxypentane-15-dioic acid | 2-hydroxytricarballylic acid | 2-hydroxypropane-123-tricarboxylic acid | anhydrous citric acid | Citric acidanhydrous | E330

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Chemical Properties

CAS Number
77-92-9
EC Number
201-069-1
Mol. Weight
192.12
HS Code
2918 14 00

Industries

Documentation