Organic & Inorganic Solvents
Solvents are liquids that dissolve other substances without chemical reaction — used as process media, cleaning agents, extraction media, reaction diluents, coating carriers, and adhesive/coating vehicles. The category is large (hundreds of distinct solvent products across the aromatic, aliphatic, oxygenated, and chlorinated families), regulated (most are flammable or toxic, requiring specialised handling and transport), and important to many manufacturing processes downstream.
Primary families Himalay sources: aromatic hydrocarbons (toluene, xylene — mixed xylenes and individual o/m/p-xylene isomers, ethylbenzene, trimethylbenzenes, aromatic 100/150 Solvesso-type heavy aromatics — used in paints, coatings, adhesives, pharmaceutical synthesis); aliphatic hydrocarbons (hexane, heptane, octane, iso-octane, cyclohexane, mineral spirits/white spirit, petroleum ether — used in extraction, cleaning, rubber and polymer processing); oxygenated solvents — alcohols (methanol, ethanol absolute and denatured, isopropanol IPA, n-butanol, iso-butanol, glycols like ethylene glycol, propylene glycol, butanediol), ketones (acetone, methyl ethyl ketone MEK, methyl isobutyl ketone MIBK, cyclohexanone), esters (methyl acetate, ethyl acetate, n-butyl acetate, isobutyl acetate), glycol ethers (butyl cellosolve, butyl carbitol, methyl cellosolve, Dowanol family); chlorinated solvents (methylene chloride, chloroform, trichloroethylene, perchloroethylene — declining use due to environmental and health regulations); and specialty green solvents (ethyl lactate, dimethyl carbonate, d-limonene — for applications replacing traditional solvents on environmental grounds).
Key specifications: purity grade (industrial, technical, ACS/AR, HPLC, LC-MS — discussed in the laboratory-chemicals category); boiling point or boiling range (single-boiler solvents like acetone vs narrow-cut petroleum fractions like hexane isomers); flash point (defines UN transport class and fire-safety handling); water content (Karl Fischer value — critical for solvents used in reactions with water-sensitive materials); peroxide content (for ether-family solvents that form explosive peroxides on storage); and application-specific approvals (pharmaceutical, food-grade, electronic-grade).
Transport and safety: nearly all solvents are UN-classified hazardous materials, typically Class 3 (flammable liquids) with packing group II or III depending on flash point. Toxic or carcinogenic solvents (methanol, methylene chloride, benzene) carry additional Class 6.1 (toxic) or Class 9 (miscellaneous dangerous) markings. IMDG Code compliance for sea freight, IATA DGR for air. Specialised tankers for bulk (ISO tank containers, drummed, or IBC-totted) with all containers UN-spec. Antistatic packaging for flammable solvents in pharmaceutical and electronics applications.
Indian solvent production spans mainstream industrial grades from petrochemical complex producers (Reliance, IOC, HPCL, BPCL, Tamilnadu Petroproducts, GNFC) and specialty solvents from fine-chemical manufacturers. Quality at industrial grade is fully competitive with Chinese, Korean, and European producers; pharmaceutical-grade solvents (meeting USP/EP/BP/ICH Q3C residual-solvent specifications) are supplied by a subset of GMP-compliant Indian producers.
