Optically clear silicone compositions

In an optically clear silicone composition which can be cured to an elastomer comprising

• a) an organopolysiloxane with two or more vinyl groups in the molecule,
• b) optionally an organopolysiloxane without reactive groups,
• c) an organopolysiloxane with two or more SiH groups in the molecule,
• d) a catalyst containing Pt metal or Pt metal complexes, and
• e) an inhibitor,
• wherein the improvement comprises
• the silicone composition additionally contains a low molecular weight tetrafunctional SiO.sub.4/2 --and monofunctional R.sub.3 SiO.sub.1/2 --containing resin which contains vinyl and ethoxy groups and is homogeneously soluble in a) and which resin, firstly, has a vinyl group content of 0.5-8 mmol/g, secondly, consists of SiO.sub.4/2, RO.sub.1/2 and R.sub.3 SiO.sub.1/2 units, where R represents a methyl, vinyl, phenyl or ethyl group, and has an ethoxy group content of less than 4 mmol/g and, thirdly, is present in the silicone composition to the extent of 1-10% by weight,
• the catalyst content--calculated as metal--is less than 5 ppm based on the total mixture,
• the SiH group content is from 0.05 to 0.8 mmol/g based on the total mixture,
• the inhibitor is an organopolysiloxane containing 0.5 to 11.6 mmol vinyl/g,
• the specific gravity of the curable silicone composition is less than 1.0, and
• the silicone composition optionally additionally contains branched saturated hydrocarbons with 15-50 C atoms.