GamaKim | Chemistry & Textile Solutions

🧪 Caustic Soda Flake – Technical Specification Sheet

Chemical Name: Sodium Hydroxide
Molecular Formula: NaOH
Molecular Weight: 39.997 g/mol
CAS Number: 1310-73-2
EC Number: 215-185-5
UN Number: UN1823 – Sodium Hydroxide, Solid
Appearance: White orthorhombic flakes
Odor: Odorless
Purity: ≥ 99% (Technical Grade)

🔁 Synonyms / Alternative Names

Sodium Hydroxide
Caustic Soda
Sodium Hydrate
Caustic Soda Flake
Caustic Soda Solution
NaOH
E524 (Food Additive Code)
CAS No: 1310-73-2

⚙️ Physical and Chemical Properties

Property	Value
Appearance	White flaky solid
Density	2.13 g/cm³ at 25 °C
Boiling Point	1388 °C
Solubility in Water	Freely soluble; ~109 g/100 mL at 20 °C
Solubility in Ethanol	Freely soluble
Hygroscopicity	Strongly hygroscopic; absorbs CO₂ from air forming sodium carbonate
Corrosiveness	Highly corrosive to skin and metals
Flammability	Non-flammable
Decomposition	Emits toxic fumes when heated

⚠️ Safety Notes

Irritant: Causes severe burns upon contact with skin or eyes.
Toxicity: Classified as a hazardous chemical; handle with appropriate PPE.
ADR Classification:

Caustic soda (sodium hydroxide) is available in various grades, each suited for different applications. Here are the main types:

Technical Grade: Used in industrial applications such as chemical manufacturing, water treatment, and petroleum refining.
Food Grade: Meets the purity standards required for use in food processing and preparation.
Pharmaceutical Grade: Meets the stringent purity standards required for use in pharmaceutical manufacturing.
Reagent Grade: High purity, used in laboratory settings for analytical and research purposes.

🧪 Sodium Hydroxide – Alternative Names and Forms (English)

Category	Name / Term	Description
Chemical Name	Sodium Hydroxide	Official IUPAC name; used in COA, SDS, and regulatory documents.
Abbreviation	NaOH	Common chemical shorthand; appears on packaging and technical sheets.
CAS Number	CAS No: 1310-73-2	Globally recognized identifier for sodium hydroxide.
UN Code	UN1823 – Sodium Hydroxide, Solid	Used in ADR transport and hazardous goods classification.
General Trade Name	Caustic Soda	Widely used commercial name across industries.
Pearl Form Names	Caustic Soda Pearls<br>Pearl Caustic Soda<br>Sodium Hydroxide Pearls<br>NaOH Pearls	Refers to spherical granules; used in detergents, textiles, food, and chemicals.
Flake Form Names	Caustic Soda Flakes<br>Flake Caustic Soda<br>Sodium Hydroxide Flakes<br>NaOH Flakes	Refers to flat crystalline form; common in industrial cleaning, pulp & paper, and water treatment.
Liquid Form Names	Caustic Soda Solution<br>Liquid Caustic Soda<br>Sodium Hydroxide Solution	Aqueous form; typically 30–50% concentration.
Food Grade Name	E524 – Sodium Hydroxide	EU food additive code; used for pH regulation and peeling in food processing.
Pharma Grade Name	Sodium Hydroxide – Pharma Grade	High purity form for pharmaceutical applications; GMP-compliant.
Low Iron Grade	Sodium Hydroxide – Low Iron	Used in electronics and high-purity chemical processes.
Micro Pearl / Fine Grade	Sodium Hydroxide Micro Pearls	Smaller granule size; faster dissolution in sensitive processes.

🧪 Caustic Soda Pearls – Applications

Industry	Application Details
Textile	pH adjustment before dyeing, mercerization, cellulose dissolution
Detergents & Cleaning	Industrial degreasers, soap production, surface cleaners
Food Processing	As additive E524; olive curing, starch modification, pH control
Pulp & Paper	Kraft pulping, lignin removal, fiber separation
Water Treatment	pH elevation, heavy metal precipitation, flocculation aid
Petrochemicals	Acid neutralization, catalyst preparation, refining processes
Pharmaceuticals & Cosmetics	pH regulator, active ingredient solubilizer, GMP-compliant production
Metallurgy	Aluminum extraction, surface cleaning, pre-treatment for plating
Electronics & Semiconductors	Ultra-pure grade for wafer cleaning, surface preparation