Method for sealing natural stones

A natural cut stone according to at least one of claims 1 to 10, characterized in that,

• the natural cut stone is obtainable by a method according to at least one of claims 12 to 22.

A method for sealing a natural cut stone, characterized in that,

• for sealing the natural cut stone, a flowable, fluid composition which is introduced into the pores accessible from the surface and solidified there is prepared, this composition being prepared by first preparing a mixture of a silane of the formula (Z1)1Si(OR)3, where Z1=OR or Gly (=3-glycidyloxypropyl) and R=identical or different alkyl radicals having 1 to 6 carbon atoms, an alcohol and a water-containing initiator, selected from an aqueous acid or base, and mixing this mixture with a second silane of the formula (Z2)zSi(OR)4-z, where R=an alkyl radical having 1 to 6 carbon atoms, where Z2=HaFbCn where a and b=integers, a+b=1+2n, z=1 or 2, n=1 to 16 or, where Z1=Gly, Z2=Am (=3-aminopropyl) and z=1 or 2, z being 1 when Z2 is Am.

A natural stone seal, characterized in that,

• the seal has a matrix material which has a network for red by silicon-oxygen bonds, and the silicon atoms present in the network have organic radicals bonded partly via carbon atoms to the silicon.