DOUBLE-FIRED CERAMICS: CHROMATIC AND DECORATIVE CLARITY
Double baking, the first time for the body and the second for the glaze, is used for the tiles, obtained using this special technological process.
This type of ceramic boasts particular chromatic clarity and makes creative decoration possible, by applying undertones on the surface and thus even obtaining complex aesthetic effects. This ceramic is used mainly for indoor wall covering.
It embellishes spaces like kitchens, bathrooms and other rooms, giving these areas a personal touch and integrating with the architectural elements present.
DOUBLE-FIRING AND TECHNICAL FEATURES
“UNI EN 14411 (ISO 13006) – BIII (Appendix L) GL”
Double-fired tiles are obtained using the purest clays and other fine raw materials, opportunely mixed, atomized using the best technologies and pressed through high-pressure hydraulic presses.
The baking of the substrate takes place in a rapid cycle through roller kilns at a temperature of approximately 1150/1170° C.
After the glazing of the biscuit, the next step is the baking of the glaze in a single-layer roller kiln at approximately 1050°C.
Coating materials are obtained, with a bending tensile strength on average higher than 15N/mm2 according to UNI EN ISO 10545-4 and with water absorption greater than 10%, classified in the BIII (GL) group according to the UNI EN 14411 regulation.
This type has practically no shrinkage during baking and this dimensional consistency translates into considerable ease of laying, as there is only one size.
HOW DO YOU LAY THE DOUBLE-FIRED MATERIAL?
The double-fired tiles can be laid with either adhesives or cement-based mortars indifferently.
Wetting before laying should absolutely be avoided when using acrylic or vinyl resin-based adhesives and when using two-component organic solvent-based adhesives.
With big sizes, it is best to work with a double-spreading laying system and, for large surfaces, plan to use suitable expansion joints that should not be positioned more than 4-5 metres from each other.