Abstract: A solvent mixture for use in vapor cleaning degreasing systems. Dibromomethane is used as the principal component instead of such high ozone depleting chlorofluorocarbons as Freon and 1,1,1 Trichloroethane. Dibromomethane is mixed with other solvents including a number of low boiling solvents which prevent the mixture from becoming acidic on the release of bromine into the atmosphere.

Abstract: Refrigerant leakage in heating, ventilating and air conditioning systems employing hydrofluorocarbon refrigerants is determined by adding a mixture of predetermined amounts of a naphthalamide optical brightener with an appropriate lubricant to the system. Inspection of the system under ultraviolet light provides an indication of any leakage occurring in the system of liquid and/or gas.

Abstract: A blend of terpene hydrocarbons and aliphatic or cyclic ketones are used for the effective cleaning of electrical contacts. Such terpenes blended with ketone solvents have high dielectric strength, fast evaporation rate, and biodegradability making the proposed mixture an ideal substitute for the cleaning of electrical contacts in the electrical utility industry and for the cleaning of printed circuit boards in the electronics industry.

Abstract: A solvent selected from the terpene hydrocarbon group and terpene alcohol group as a cleaning agent can provide effective cleaning of heating, ventilating and air conditioning systems which use hydrofluorocarbon or hydrochlorofluorocarbon or Freon refrigerants by using a solvent as described. Flushing through the refrigerant system condenser coils and evaporation coils removes any trace of excessive compressor lubricant which will be carried out with the solvent. The flushed materials carried out are biodegradable, thus are desirable from an environmental standpoint.

Abstract: A new process is provided which when used will shield occupants of any dwelling from EMF radiation. The conditions specify the use of a conductive material which resists the passage of electric charge in a very narrow range, from 0.2-400 ohms/square with 377 ohms/square as best. This number has a special significance: it is the resistance of a perfect absorber of electromagnetic radiation. The coating will be used as a primer paint and will provide an excellent shield from EMF radiation, especially that which occurs with high voltage lines at 60 Hz but also for microwave radiation at a frequency of 10 kilohertz to 100 gigahertz.