BS 31
is an addition two-part cross-linking Methyl silicone resin (50% Toluene + 2% hardener TU 2)(1,5 : 1)
made by Wacker Chemie with good adhesion. BS 31 was used from 1970 to 1984 for paint layers and
surface consolidations in various windows at Cologne Cathedral.

Rhodia CAF 3 + 33 silicone
mixture of polydimethylsiloxanes, silicis and curing agents. During use acetic acid is released.

Cologne Cathedral, sXXII
(Germany)
 

Cologne Cathedral, NVI
(Germany)

Chartres, bay 50
(France)

BS 31 was used as a paint layer
and surface consolidation material
in the Bavarian cycle (19th century)

 

BS 31 was used as a paint layer
and consolidation material in the
cycle of kings in the choir
(14th century)

CAF 3 was used for silicone bonding and back plating

Chartres, bay 42
(France)
 

Canterbury Cathedral, SXXVIII
(United Kingdom)

CAF 3 was used for silicone
bonding and back plating

Rhodia CAF 3 was used for crack bondings