natural polymers, e.g. hardened proteins, chemical derivatives of natural rubber, n.e.s., in primary forms (excl. alginic acid and its salts and esters) ton cyprus united kingdom - - nucleic acids and their salts, whether or notchemically defined; heterocyclic compounds (excl. those with oxygen or...
and simplest surfactant is soap, already known and used by the ancient egyptians. soap is of course still widely used as a detergent and cleaning product, though during the course of the th century more effective and multi-functional surfactants have been developed, based on both mineral and plant oils...
improving the viscosity and lubricity of the oil. additionally, they are used to protect engines from corrosion, extend the service life of the oil, and dissolve and disperse harmful sludge. the need to reduce vehicular emissions and to increase fuel economy has led to the development of lubricating oils...
chemically defined; preparations as specified in note to this chapter based on synthetic organic colouring matter; synthetic organic products of a kind used as fluorescent brightening agents or as lumin ₹ ₹ ₹ ₹ footwear with outer soles of rubber, plastics, leather or composition leather and uppers...