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Claim 1

THE PROCESS FOR OBTAINING A COVERTIBLE HYDROCARBONSUBSTITUTED POLYSILOXANE WHICH IN THE CURED, SOLID, ELASTIC STATE HAS IMPROVED COMPRESSION SET CHARACTERISTICS, THE SAID POLYSILOXANE HAVING AN AVERAGE OF FROM 1.98 TO 2.01 HYDROCARBON GROUPS PER SILICON ATOM, WHICH PROCESS COMPRISES ADDING A COMPRESSION SET ADDITIVE TO THE SAID HYDROCARBON-SUBSTITUTED POLYSILOXANE FROM WHICH POLYSILOXANE THERE HAS BEEN REMVOED, IN THE ABSENCE OF ANY FINELY DIVIDED INORGANIC FILLER, LOW MOLECULAR WEIGHT VOLATILE HYDROCARBON-SUBSTITUTED POLYSIOXANES OF SIMILAR STRUCTURE PRESENT IN THE AFORESAID HYDROCARBON-SUBSTITUTED POLYSILOXANE AND BOILING BELOW 25/*C. WHEN MEASURED AT 760 MM. TO A POINT WHERE LESS THAN 2%, BY WEIGHT, OF THE CONVERTIBLE HYDROCARBON-SUBSTITUTED POLYSILOXANE COMPRISES THE AFORESAID LOW MOLECULAR WEIGHT HYDROCARBONSUBSTITUTED PLYSILOXIANE, THE COMPRESSION SET ADDITIVE BEING SELECTED FROM THE CLASS CONSISTING OF MERCURY, OXIDES OF MERCURY, SALTS OF MERCURY, CADMIUM SALTS OF ORGANIC ACIDS, QUINONES, NAPHTHOQUINONES, ALKYLATED QUINONES, HALOGENATED QUINONES, ALKYLATED NAPHTHOQUINONES, HALOGENTED NAPHTHOQUINONES, AND HYDROCARBON MONOETHERS OF HYDROQUINONE.