About this product
Caustic Soda Lye is sodium hydroxide solution (NaOH, CAS 1310-73-2) at 47% minimum concentration — the liquid form of caustic soda, also called caustic lye or liquid caustic soda. We distribute IS 252:2013 Grade-1 material sourced from Tamilnadu Petroproducts Limited (TPL), the BIS-licensed membrane-cell plant at Manali, Chennai, backed by the manufacturer's Certificate of Analysis. We deliver by bulk road tanker from our Redhills, Chennai warehouse across South India for soap, textile, paper and water-treatment buyers.
Caustic Soda Lye at a glance
- Also known as
- Sodium hydroxide solution · Liquid caustic soda · Caustic lye
- CAS number
- 1310-73-2Same CAS as solid caustic soda, 1310-73-2: the lye is sodium hydroxide in water at 47% minimum concentration.
- Formula
- NaOH (47% min in water)
- HSN code
- 2815 12 00
- UN number
- UN 1824
CAS number and formula checked against PubChem on 8 October 2026. Full grade and property values are in the specifications below. More lookups: chemical abbreviations list · CAS number reference.
Applications & Uses
Safety & Technical Documents
MSDS / SDS
Technical data sheet (TDS) & Certificate of Analysis
Batch Certificate of Analysis (CoA) · supplied with every delivery
Need another sheet? Browse the full SDS & TDS library — safety and technical data sheets for every product we stock.
Product DataGrades & Technical Specifications
Grades & Technical Specifications
Physical Properties
- Purity
- 99.50% min NaOH on dry basis
- Assay
- 47% min NaOH (as NaOH, by mass)
- Density
- Specific gravity 1.492 min at 30°C
Supply & Packaging
- Packaging
- Bulk road tanker
- Grades Available
- IS 252:2013 Grade-1 (BIS CM/L-6100076189)
- Origin
- Domestic
Compliance & Storage
- HS Code
- 2815 12 00
- UN Number
- 1824
- Hazard Class
- Class 8 — Corrosive
These specs are indicative. Request a Certificate of Analysis (COA) for batch-specific values.
Source Manufacturers
Sourced directly from verified manufacturers for consistent quality and traceability.
Supplied across South IndiaCoimbatoreMaduraiHosurBangaloreHyderabadVisakhapatnamKochi
Frequently Asked Questions
What is caustic soda lye (sodium hydroxide solution)?
Caustic soda lye is the aqueous solution form of caustic soda — sodium hydroxide (NaOH), CAS 1310-73-2. Buyers also call it caustic lye, liquid caustic soda, lye solution or NaOH solution. We stock IS 252:2013 Grade-1 lye with 47% minimum NaOH content.
What is the difference between caustic soda lye and caustic soda flakes?
Lye is the liquid form: sodium hydroxide already in solution, 47% minimum NaOH in our case. Flakes, pearls and prills are solid forms of the same chemical that must be dissolved before use. Lye ships by bulk road tanker and goes straight into the process — no on-site dissolving.
What is the CAS number and HSN code for caustic soda lye?
The CAS number is 1310-73-2 and the HSN code is 2815 12 00. For transport it is classified UN 1824, Class 8 (corrosive).
What specification does your caustic soda lye meet?
IS 252:2013 Grade-1, backed by the manufacturer's Certificate of Analysis: 47% minimum NaOH, 99.50% minimum on dry basis, sodium carbonate 0.20% max, iron 10 ppm max and specific gravity 1.492 minimum at 30°C. The source plant holds BIS licence CM/L-6100076189.
Who supplies caustic soda lye in bulk in Chennai?
We do — trading from Chennai since 1997, with dispatch from our Redhills warehouse across South India. Our lye is sourced from Tamilnadu Petroproducts Limited (TPL), the BIS-licensed membrane-cell caustic plant at Manali, Chennai, and delivered by bulk road tanker. Call or WhatsApp +91 86087 80096 for a quote — order sizes depend on packaging and current stock.
What is caustic soda lye used for, and how should it be handled?
It is a workhorse industrial alkali: soap and detergent making, textile processing, pulp and paper, water and effluent treatment, and general pH neutralisation. It is corrosive (UN 1824, Class 8) and causes severe skin burns and eye damage — handle with chemical goggles, face shield and PVC or rubber gloves, and never add water to the lye.