Hydrostatically damping and shock absorbing non-vulcanizable polysiloxane and boron compound for mechanical energy absorption

A hydrostatically damping and shock absorbing, non-vulcanizable polysiloxane and boron-containing composition for mechanical energy absorption which is capable of flowing in a cylinder in which the plunger thereof is to be displaced, consisting of:

• (a) 100 parts by weight of polysiloxane polymer which is made by heating a mixture of 3 mols of alkyl-aryl-polysiloxane diol, where alkyl contains 1 to 10 carbon atoms and aryl from 6 to 10 carbon atoms and which has a freezing temperature of less than -50.degree. C., with from 1 to 50 moles of boron compounds selected from the group consisting of boric acid and ethyl borate added in the form of a solution in glycerine, which is partially evaporated during the reaction;
• (b) from 01 to 200 parts by weight of fillers with a specific surface area of 10 to 400 m.sup.2 /g by BET method;
• (c) from 0.01 to 300 parts by weight of pigment with a specific surface area not exceeding 200 m.sup.2 /g/BET/;
• and
• (d) from 01 to 100 parts by weight of alkyl-alkyl-aryl-siloxane oils, where the alkyl contains 1 to 10 carbon atoms and the aryl 6 to 10 carbon atoms and having a viscosity of 1.times.10.sup.4 to 2.times.10.sup.6 cP at 25.degree. C.