Abstract: A radiation-resistant grease that is stable under elevated temperatures is disclosed. The grease is prepared by mixing a bentonite-based thickening agent with a base oil composed of m-(m-phenoxyphenoxy)diphenyl, pentaphenyl ether, a monoalkyltriphenyl ether or a monoalkyltetraphenyl ether (provided that the alkyl group contains 6-20 carbon atoms). To the mixture is added, if necessary, a gelling aid composed of an aliphatic alcohol, an aliphatic ketone and/or an aliphatic carbonate ester.

Abstract: A fluoroalkoxy cyclic phosphonitrile ester represented by the formula (1)[H(CF.sub.2 CF.sub.2)mCH.sub.2 O].sub.2 n-l[CF.sub.3 CF.sub.2 CH.sub.2 O]lPnNn (1)wherein (CF.sub.2 CF.sub.2)m is a single segment of the unit (CF.sub.2 CF.sub.2) multiplied by an integer or indicates conjoint presence of segments having different chain lengths and each comprising the unit (CF.sub.2 CF.sub.2) multiplied by an integer, m is 2 in the case of the single segment or, in the case of the presence of segments of different chain lengths, represents the average of the chain lengths, means the average number of repeating units (CF.sub.2 CF.sub.2) and is in the range of 1.3.ltoreq.m.ltoreq.2.8, l is in the range of 2n-1.gtoreq.l.gtoreq.1, and n is the number of repeating PN units of the phosphonitrile cyclic skeleton, or represents the average number of repeating PN units and is a real number in the range of 3.ltoreq.n.ltoreq.4.3 when rings of different numbers of repeating units are conjointly present.

Abstract: A radiation-resistant grease employed in various machines at nuclear facilities, based on (A) an oil principally composed of a phenoxyphenoxydiphenyl and a mono- and/or dialkyldiphenyl ether and (B) a bentonite based thickening agent, if necessary, together with (C) a gelling aid of alcohol, ketone, or carbonate ester.

Abstract: An oil blend having resistance to ionizing radiation comprising the following components is herein disclosed:A. 25 to 75 wt % of 0-70 wt % of o-(m-phenoxyphenoxy)diphenyl and 100-30 wt % of m-(m-phenoxyphenoxy)diphenyl; andB. 75 to 25 wt % of a monoalkyldiphenyl ether or dialkyldiphenyl ether.This oil blend has a pour point of 0.degree. C. or below and has a G-value of 0.1 or lower for the evolution of decomposition gases under irradiation with ionizing radiation. Said ethers have 10 to 20 carbon atoms in the alkyl moiety.

Abstract: A hydraulic fluid comprising an oil and at least one butadine derivative selected from the group consisting of .alpha.,.omega.-polybutadienedicarboxylic acid, maleinized polybutadiene, hydrogenated .alpha.,.omega.-polybutadienedicarboxylic acid, and hydrogenated and maleinized polybutadiene.