A surfactant is a molecule with one end that likes water and one end that likes oil. It lowers surface tension, so liquids spread, wet, clean, foam or hold oil and water together.
India makes all four main classes: anionic, non-ionic, cationic and amphoteric. Gujarat holds a large share of the capacity, from large sulphonation and ethoxylation plants to small blenders.
What surfactants do
- Wetting agents help water penetrate fabric, powder or soil quickly.
- Detergents lift oil and dirt from a surface and keep it suspended in the wash water.
- Emulsifiers hold oil droplets in water, or water droplets in oil, in a stable mixture.
- Dispersants keep solid particles, such as pigments or pesticide powders, from clumping.
- Foaming agents and defoamers raise or lower foam, depending on the process.
Types commonly made in India
Indian plants make the high-volume detergent surfactants, such as linear alkylbenzene sulphonic acid (LABSA), sodium lauryl ether sulphate (SLES) and sodium lauryl sulphate (SLS). They also make a wide range of ethoxylates, such as fatty alcohol ethoxylates, nonylphenol and other alkylphenol ethoxylates, castor oil ethoxylates and polyethylene glycols.
Cationic products include quaternary ammonium compounds used in fabric softeners, hair conditioners and disinfectants. Amphoterics such as cocamidopropyl betaine go mainly into personal care. Many plants also sell blends made for one use, such as an agrochemical emulsifier pack or a textile scouring agent.
The differences between the classes are covered in anionic, non-ionic and cationic surfactants.
Points to check before you buy
Active matter is the first number to agree. A paste sold at 70% active and one sold at 28% are very different products, even under the same name. Ask for active content, free oil, pH and colour on every certificate of analysis.
For ethoxylates, agree the degree of ethoxylation and the test for it, usually hydroxyl value or cloud point. Ask where the base alcohol or oil comes from, since this affects odour, colour and any natural or palm-free claim.
Some markets restrict certain surfactants. Alkylphenol ethoxylates, for example, face limits in the EU and in many textile restricted-substance lists. Check your market's rules, and confirm with your regulator or compliance adviser before you order.
Form, packing and handling
Surfactants come as liquids, pastes, flakes, needles or powders. Pastes such as concentrated SLES can gel if diluted wrongly, so agree the form that suits your plant. LABSA is acidic and corrosive, so it needs suitable drums, IBCs or lined tanks, and it may be classed as dangerous goods.
Many surfactants are not dangerous goods for transport, but some are classed as harmful to the aquatic environment. Read the safety data sheet before you book freight, and let your forwarder confirm the classification.
Viscosity also matters at the receiving end. A thick paste in winter may not pump out of an IBC without warming. Ask the supplier for viscosity data at low temperatures, and plan your unloading around it.
Next step
We shortlist plants that run their own sulphonation or ethoxylation, check samples against your specification, and have lots tested before loading. To discuss your grade, book a free sourcing review.