… used for lining electric ovens or for the manufacture of crucibles. Silicon nitride (Si 3 N 4 ) is a greyish‑white … and sodium hydroxide; colourless crystalline flakes. Soluble in water, deteriorates slightly in humid atmosphere. …
… parts of turbo-jet engines (stator rings, with or without blades, rotor discs or wheels, with or without fins, blades and fins), fuel feed regulators, fuel nozzles). ° ° …
… be replaced by rosin acids. The heading covers only soap soluble in water, that is to say true soap. Soaps form a … ( heading 15.22 ). (b) Products and preparations insoluble in water, which are “soaps” only in the chemical …
