Litholite and Hermetique conservans

Does any one on the list have information about a German stone
conservation product used in the 1950-60's  called "Litholite" or
"Litholite rot" distributed by a German Firm "Mueller". (It should
be hydroflouric acid or a fluate) Further, does somebody happen to
know what the product called "Hermetique conservans" could have
been--we suspect it to be either a silicic acid ester or a water
glass product, it was used in Germany 1963 and after.

Dr. Christine Blaeuer Boehm
BCD GmbH
Wankdorffeldstr. 102, PF 261, CH-3000 Bern 22
+41 31 335 62 12 or
+41 81 252 59 84
Fax: +41 81 253 69 48

                                  ***
                  Conservation DistList Instance 13:26
                Distributed: Wednesday, October 20, 1999
                       Message Id: cdl-13-26-011
                                  ***