Abstract: There is disclosed a highly densified, sintered aluminum nitride body having a thermal conductivity in excess of 200 W/m.degree.K. and a strong resistance to attack by hot HC1. There is also disclosed a method of sintering aluminum nitride bodies which employs a variable thermal cycle whereby the body is either heated slowly through a pre-sintering temperature range of 1300.degree. to 1750.degree. C., or held at a temperature within that range for at least a half hour. Optionally, a green aluminum nitride body may be provided with up to 10% by weight of at least one metal fluoride dopant, and may be provided with a sufficient weight to maintain flatness during firing.

Abstract: Composition containing(a) at least one lubricant, hydraulic oil or metal-working fluid based on mineral oil or synthetic oils and(b) 0.05-5% by weight, based on the total weight of the lubricant, hydraulic oil or metal-working fluid composition, of at least one compound of the formula II ##STR1## where R.sup.1 and R.sup.2 are independently alkyl, aryl, subsituted aryl or benzyl, R.sup.3 is hydrogen or methyl, R.sup.4 and R.sup.5 are independently hydrogen, methyl, methoxy, chloro or nitro, R.sup.7 is hydrogen or methyl, R.sup.8 is hydrogen, alkyl, alkylthiomethyl or alkylene, R.sup.9 is hydrogen or methyl and n is 1 to 4.