- Chemical identity: Ammonia solution (liquor ammonia / ammonium hydroxide) is anhydrous ammonia gas dissolved in water — typically at 10–28% NH3 concentration.
- Indian standard: IS 6099 governs ammonia solution quality in India, defining Grade 1 (28% minimum) and Grade 2 (25% minimum) for industrial supply.
- pH range: At 25% concentration, ammonia solution has a pH of approximately 13 — strongly alkaline, making it effective for grease dissolution and pH adjustment in process chemistry.
- Key uses: Textiles, cleaning products, water treatment, rubber processing, wood composites, analytical chemistry, and food processing all rely on ammonia solution.
- Storage: HDPE or stainless steel tanks in ventilated areas — not carbon steel or copper containers. PESO licence required above threshold storage quantities.
- Ammoniagas supply: Liquor ammonia from Ammoniagas is IS 6099-compliant, supplied in tankers, IBCs, and drums with full batch certificate of analysis.
- What Is Ammonia Solution?
- How Ammonia Solution Is Made
- Chemical and Physical Properties
- Grades, Concentrations, and IS Standards
- Industrial Applications and Uses
- Textiles and Cleaning Applications
- Water Treatment and Environmental Uses
- Chemical and Manufacturing Uses
- Safety, Handling, and Storage
- How to Choose the Right Grade
- Who Uses Ammonia Solution in India?
- Related Reading
- Frequently Asked Questions
Ammonia solution is one of the most versatile industrial chemicals in existence. Known variously as liquor ammonia, aqueous ammonia, ammonium hydroxide, or simply ammonia water, it is consumed by industries ranging from textiles and cleaning products to water treatment, rubber processing, and analytical chemistry. Yet despite its ubiquity, it is often misunderstood — confused with anhydrous ammonia, mislabelled in procurement, or used at the wrong concentration for the application at hand.
This guide provides a definitive, practically grounded explanation of what ammonia solution is, how it is made, what its key properties mean for different applications, how IS 6099 governs its quality in India, and how to source the right grade from a reliable supplier. Ammoniagas supplies IS 6099-compliant liquor ammonia to industrial customers across India in bulk tankers, intermediate bulk containers, and drums.
1. What Is Ammonia Solution?
Ammonia solution is a liquid formed by dissolving anhydrous ammonia gas (NH3) in water. The resulting solution is characterised by a strong, pungent ammonia odour, clear colourless appearance, and strongly alkaline pH. When ammonia dissolves in water, the following equilibrium is established:
NH3 (g) + H2O (l) ⇌ NH4OH (aq) ⇌ NH4+ (aq) + OH- (aq)
The solution contains dissolved ammonia molecules (NH3), ammonium ions (NH4+), and hydroxide ions (OH-) in equilibrium. The species traditionally called ammonium hydroxide (NH4OH) exists in the solution but cannot be isolated as a pure compound — it immediately dissociates to NH3 and water. This is why the product is more accurately described as ammonia solution or aqueous ammonia rather than ammonium hydroxide, though all three names are used in practice.
The equilibrium between dissolved NH3 and NH4+ ions is temperature-dependent. As temperature increases, the equilibrium shifts toward dissolved NH3 molecules, which have a higher vapour pressure — this is why ammonia solution loses concentration over time at elevated temperatures and why storage in cool conditions is important for maintaining specification. A 25% ammonia solution stored at 40°C will lose a measurable fraction of its ammonia content to vapour within days if the container is not sealed.
2. How Ammonia Solution Is Made
Industrial ammonia solution is produced by absorbing anhydrous ammonia gas into purified water in a counter-current absorption column or absorption tower. The process is highly exothermic — dissolving ammonia releases significant heat — so the absorption system is cooled to maintain the target concentration and prevent excessive vapour loss during production.
The raw material is anhydrous ammonia produced by the Haber-Bosch process (the synthesis of NH3 from atmospheric nitrogen and hydrogen at high temperature and pressure over an iron catalyst). After synthesis and purification, the anhydrous ammonia is either stored as liquid under pressure for direct industrial use, or absorbed into water to produce ammonia solution for applications where the aqueous form is more convenient.
For the highest-purity analytical and reagent-grade ammonia solutions, the absorption water is ultra-purified deionised water, and the anhydrous ammonia feedstock is high-purity grade. Industrial-grade ammonia solutions use industrial-quality process water, producing a product suitable for most industrial applications while meeting IS 6099 specifications. The ammonia gas manufacturing process is detailed in our dedicated article.
3. Chemical and Physical Properties
| Property | Value (25% NH3 Solution) | Significance |
|---|---|---|
| NH3 Content | 25% by weight | Defines cleaning power and reactivity |
| Density | ~0.91 g/mL at 20°C | Lighter than water — important for tank sizing |
| pH | ~13.0 | Strongly alkaline — effective for degreasing and pH adjustment |
| Boiling point | ~38°C (varies with concentration) | Volatile at ambient temperatures — requires sealed storage |
| Flash point | None (non-flammable as solution) | Lower fire hazard than anhydrous ammonia |
| Colour | Clear, colourless | Colour development indicates contamination |
| Odour | Strong pungent ammonia smell | Detectable at very low concentrations — olfactory warning |
| Solubility | Miscible with water in all proportions | Easy dilution to working concentration |
4. Grades, Concentrations, and IS Standards
IS 6099 is the Bureau of Indian Standards specification governing ammonia solution quality for industrial use in India. It defines two commercial grades and specifies the quality parameters that each grade must meet.
| Grade | Min NH3 Content | Max Residue on Evaporation | Colour | Typical Application |
|---|---|---|---|---|
| IS 6099 Grade 1 | 28.0% by weight | 0.05% | Colourless | High-strength industrial applications, textile, chemical manufacture |
| IS 6099 Grade 2 | 25.0% by weight | 0.1% | Colourless | General industrial applications, water treatment, cleaning |
| Analytical Reagent (AR) Grade | 25–30% by weight | 0.001% | Colourless | Laboratory analysis, pharmaceutical manufacturing |
| Light Commercial Grade | 10% by weight | Varies | Colourless | Household cleaning products, dilute process applications |
5. Industrial Applications and Uses
Ammonia solution’s combination of strong alkalinity, water solubility, and complete volatility on evaporation makes it valuable across an exceptionally wide range of industrial applications. The following sections cover the major application categories in detail.
6. Textiles and Cleaning Applications
Textile Processing
The textile industry is one of the largest consumers of ammonia solution in India. Ammonia in textile and dyeing industries is used for scouring (removing natural waxes and impurities from raw cotton), dye-bath pH adjustment (creating the alkaline conditions needed for reactive dye fixation), anti-felting treatment for wool, and as a mordant modifier in natural dyeing processes. The reversible alkalinity of ammonia — it washes out completely without damaging fibre chemistry — makes it uniquely suited for use on delicate natural fibres where caustic soda would cause damage.
Cleaning Product Manufacturing
Cleaning product manufacturers purchase IS 6099 liquor ammonia as the active alkaline ingredient for formulation into glass cleaners, all-purpose cleaners, oven cleaners, and floor stripping products. The manufacturers typically purchase at 25–28% concentration and dilute to the final product concentration (typically 1–10%) during formulation, adding surfactants, fragrances, and other functional ingredients.
Industrial Cleaning and Degreasing
As detailed in our guide to cleaning products containing ammonia, industrial applications include CIP systems, metal degreasing, and commercial laundry operations. Industrial users typically receive liquor ammonia in bulk tankers and dose it into their cleaning circuits using metering pumps at controlled working concentrations.
7. Water Treatment and Environmental Uses
Chloramination for Drinking Water Disinfection
Chloramination is the combination of chlorine and ammonia in treated drinking water to form monochloramine (NH2Cl), which provides longer-lasting residual disinfection than free chlorine alone and produces fewer disinfection byproducts (DBPs). Water treatment plants serving populations above a certain scale frequently use this process. Ammonia solution (or anhydrous ammonia in larger facilities) is dosed precisely into the water stream immediately after chlorine dosing. Liquor ammonia in water treatment processes is covered in detail in our dedicated article.
pH Adjustment in Wastewater Treatment
Ammonia solution is used to raise the pH of acidic industrial wastewater to the acceptable range before biological treatment or discharge. It is preferred over caustic soda in some applications because its moderate alkalinity provides better pH control without the risk of overshooting to highly caustic conditions that can damage biological treatment processes.
8. Chemical and Manufacturing Uses
Rubber Latex Stabilisation
Natural rubber latex — the milky sap harvested from rubber trees — tends to coagulate rapidly after collection. Ammonia solution is added to freshly harvested latex at 0.5–1.5% concentration to create alkaline conditions that preserve the latex in liquid form during transport and processing. This is one of the oldest industrial applications of ammonia solution, practiced wherever natural rubber is grown and processed, including in India’s Kerala rubber plantation sector.
Urea-Formaldehyde Resin Production
Urea-formaldehyde (UF) resins — used as adhesives in plywood, particleboard, and medium-density fibreboard (MDF) — are manufactured using ammonia solution as a pH catalyst. The ammonia controls the reaction pH during resin condensation, influencing the molecular weight distribution and cure behaviour of the final resin. The wood composite manufacturing sector is a significant consumer of liquor ammonia in India.
Mining and Flotation
Ammonia solution is used in mineral flotation processes to adjust the pH of the flotation slurry to conditions that optimise the selectivity of the flotation reagents. In copper, gold, and nickel processing plants, pH control using ammonia solution improves recovery rates and concentrate grade.
Analytical Chemistry and Pharmaceuticals
Analytical-reagent-grade ammonia solution (25–30%, ultra-low impurity) is used in chemical analysis, pH buffer preparation, and pharmaceutical manufacturing as a reagent and pH adjustment agent. This grade commands a premium price and is available from specialist suppliers in small quantities.
IS 6099 Liquor Ammonia Supplied Across India
Ammoniagas supplies high-purity liquor ammonia at 20–28% concentration in bulk tankers, IBC containers, and drums — with IS 6099 compliance documentation and batch certificate of analysis for every delivery.
9. Safety, Handling, and Storage
Hazards of Ammonia Solution
Ammonia solution at 20–28% concentration releases ammonia vapour continuously, particularly at elevated temperatures. The vapour is toxic at concentrations above 25 ppm (TLV-TWA) and immediately dangerous at 300 ppm (IDLH). In contact with skin and eyes, concentrated ammonia solution causes chemical irritation and potential burn injury. The solution itself is strongly alkaline (pH 13) and can cause chemical burns with prolonged skin contact.
Compatible Storage Materials
Ammonia solution is compatible with: HDPE (high-density polyethylene) tanks, stainless steel (304 or 316 grade), mild steel above 20% concentration (where the ammonia inhibits corrosion), and fibre-reinforced plastic (FRP) tanks. It is incompatible with: copper, copper alloys (brass, bronze), zinc, galvanised steel, aluminium (at high concentrations), and natural rubber (causes swelling and degradation).
Storage Best Practices
Store ammonia solution in sealed tanks in a cool, ventilated area. Hot conditions cause loss of ammonia to vapour, reducing concentration and creating hazardous vapour accumulation in the storage area. Tanks should be fitted with a vent to a scrubber or activated carbon filter to prevent uncontrolled vapour release. Secondary bunding capable of containing 110% of the largest tank volume is required. Full storage procedures are detailed in our guide to storage procedures for liquor ammonia.
10. How to Choose the Right Grade
Selecting the correct grade of ammonia solution for your application prevents process failures, equipment damage, and compliance issues. Use this decision framework when specifying your procurement.
For Textile Processing
IS 6099 Grade 1 or Grade 2 (25–28%) is appropriate for most textile applications. Key quality concerns are low iron content (below 2 ppm) to avoid metallic contamination of light fabric shades, and consistent concentration across batches for reproducible process results.
For Cleaning Product Formulation
IS 6099 Grade 2 (25%) is the standard starting material for cleaning product formulation. Colour-free, low-residue product is essential — any yellowish tint in the starting material will appear in the final formulated product.
For Water Treatment
For chloramination applications, pharmaceutical-quality or food-grade ammonia solution may be specified by the water utility’s process engineer. Standard IS 6099 Grade 2 is acceptable for non-potable water treatment pH adjustment. Confirm the specification with your process engineer before procurement.
For Laboratory and Pharmaceutical Use
Analytical reagent (AR) grade or pharmaceutical-grade (USP/BP specification) ammonia solution is required. These grades have extremely low heavy metal and organic impurity limits and must be sourced from specialist laboratory chemical suppliers with appropriate quality certifications.
11. Who Uses Ammonia Solution in India?
- Textile and Dyeing Industry — scouring, pH control, dyeing
- Cleaning Products Manufacturing — glass cleaners, degreasers, industrial cleaners
- Water Treatment Plants — chloramination, pH adjustment
- Metal Fabrication and Surface Finishing — degreasing, surface preparation
- Chemical and Resin Manufacturing — UF resins, specialty chemicals
- Export and Trading — India exports ammonia solution to South and Southeast Asia
- Gujarat — textiles, chemicals, water treatment
- Maharashtra — food processing, cleaning, industrial
- Tamil Nadu — textiles, garments, water treatment
- Karnataka — food manufacturing, engineering
- Rajasthan — textile and mining sectors
- Andhra Pradesh — aquaculture, water treatment
- Uttar Pradesh — industrial cleaning, food processing
12. Related Reading
Frequently Asked Questions
What is ammonia solution and how is it made?
Ammonia solution — also called ammonium hydroxide, aqueous ammonia, or liquor ammonia — is produced by dissolving anhydrous ammonia gas (NH3) in water. The dissolution is exothermic and produces an alkaline solution because dissolved ammonia partially ionises to form ammonium ions and hydroxide ions. Industrial production involves absorbing anhydrous ammonia gas into purified water at controlled temperature and pressure to achieve the target concentration.
What are the standard concentration grades of ammonia solution in India?
In India, ammonia solution is commercially available at 10% (light industrial), 20% (general industrial), 25% (IS 6099 Grade 2), and 28% (IS 6099 Grade 1). Analytical and laboratory-grade at 25–30% is also available for scientific applications. The 20–28% range is the most commercially significant for industrial procurement.
What is the difference between liquor ammonia and anhydrous ammonia?
Liquor ammonia is an aqueous solution of ammonia gas — typically 20–28% NH3 dissolved in water. It is liquid at room temperature and atmospheric pressure and does not require pressure containment. Anhydrous ammonia is pure NH3 — it is a gas at atmospheric pressure and must be stored as a liquid under its own vapour pressure (approximately 8–10 bar at ambient temperature) in certified pressure vessels.
Is ammonia solution the same as ammonium hydroxide?
The terms are used interchangeably in practice. When ammonia gas dissolves in water, the solution contains dissolved NH3 molecules alongside ammonium ions (NH4+) and hydroxide ions (OH-). Industrial suppliers and product labels use ammonia solution, aqueous ammonia, ammonium hydroxide, and liquor ammonia interchangeably to describe the same product at various concentrations.
What IS standard covers ammonia solution quality in India?
IS 6099 is the Bureau of Indian Standards specification for ammonia solution in India. It defines Grade 1 (28% minimum NH3) and Grade 2 (25% minimum NH3) with specifications for colour, residue on evaporation, and freedom from specific impurities. All liquor ammonia supplied by Ammoniagas meets IS 6099 specifications.
What is the pH of ammonia solution at typical industrial concentrations?
At 25% concentration, ammonia solution has a pH of approximately 13.0. At 10% concentration, pH is approximately 12.0. At 1% concentration (typical household glass cleaner level), pH is approximately 11.0. At all these concentrations, ammonia solution is strongly alkaline — more so than sodium carbonate but less than sodium hydroxide at equivalent concentrations.
What industries use ammonia solution in India?
Ammonia solution is used across: textiles (scouring, dyeing pH adjustment), cleaning products manufacturing, water treatment (chloramination), rubber processing (latex stabilisation), wood composite manufacturing (UF resin production), analytical chemistry, mining (flotation), and food processing. It is one of the most widely used industrial alkalis in India.
How should ammonia solution be stored safely?
Store in HDPE or stainless steel tanks in a ventilated area away from acids, oxidisers, and heat sources. Tanks should have sealed fittings to minimise vapour loss. Storage areas require ammonia gas detectors, emergency shower and eyewash, and secondary containment bunding. PESO licensing is required for storage above threshold quantities. Do not store in carbon steel, galvanised steel, copper, or aluminium containers.
