Composition of crosslinkable elastomer silicone oils for treatment by impregnation of fibrous materials

A silicone composition for the treatment of fibrous material, which composition can be crosslinked into an elastomer, comprising:

• (a) at least one polyorganosiloxane (POS) having, per molecule, at least two alkenyl, preferably C2-C6, groups linked to the silicon;
• (b) at least one polyorganosiloxane having, per molecule, at least three hydrogen atoms linked to the silicon;
• (c) a catalytically effective quantity of at least one catalyst, preferably composed of at least one metal belonging to the platinum group;
• (d) optionally, at least one adhesion promoter;
• (e) optionally, a mineral filler;
• (f) optionally, at least one crosslinking inhibitor;
• (g) optionally, at least one polyorganosiloxane resin;
• and
• (h) optionally, functional additives in order to impart specific properties;
• wherein:
• it has a dynamic viscosity of between 1000 and 7000 mPa·s at 25° C. and more preferably between 2000 and 5000 mPa·s at 25° C. before crosslinking;
• and
• it has, after complete crosslinking by curing in a fan oven for 30 minutes at 150° C., at least one of the following mechanical properties:
• a Shore A hardness of at least two, preferably between 5 and 65,
• a tensile strength of at least 0.5 N·mm−1, preferably at least 1.0 N·mm−1 and more preferably at least 2 N·mm−1 and
• an elongation at break of at least 50%, preferably at least 100% and more preferably at least 200%.