1. What are restoration glasses and how do they compare to normal window glass?
SCHOTT restoration glasses are specifically designed to offer accurate glazing solutions for historical buildings according to their date of origin. They offer the typical surface characteristics of different historical eras that can be integrated into the modern day requirements for insulated and laminated safety glasses.
Compared to normal window glass, SCHOTT Restoration Glass offers state of the art technology in a historically correct design.
2. What colour are SCHOTT Restoration Glasses?
SCHOTT Restoration Glasses are colourless and particularly low in iron oxide. They are therefore highly pure and do not have the "green tint" typically found in conventional float glass. SCHOTT restoration glass has a high transmission of visible light making it ideal for glazing buildings where naturally bright internal conditions are important.
3. What are the differences between the different SCHOTT restoration glasses?
SCHOTT restoration glass has the typical tensile strength of the manufacturing process. In addition, they are - depending on the product - more or less distorted.
- RESTOVER® light: slightly uneven surface
- RESTOVER®: irregular surface, wavy and expressive
- RESTOVER® plus: strongly structured surface with distinct waviness
- GOETHEGLAS: full of character and irregular
- TIKANA®: slight tearing stripes
SCHOTT recommends a sample of at least 500 mm x 500 mm sample glass for the correct glass selection. Please evaluate the optics in the reflection (external view) and in the transmission (internal view).
SCHOTT Restoration Glass in use
Thanks to their moving surfaces, SCHOTT restoration glass is the right choice for the true-to-original restoration of windows and doors in historical buildings and monuments of different eras. In contrast to modern float glass with its very flat surfaces and hard reflections, machine-drawn glass gives old buildings an authentic, historical appearance:
In addition, SCHOTT restoration glass is suitable for the glazing of historical showcases and furniture as well as for the production of historical mirrors.
1. What must be considered when cutting the glasses? Machine-drawn glass has a higher residual cooling stress and greater distortion than float glass due to the manufacturing process. The cutting must therefore be carried out with an expansion cut and under consideration of certain cutting wheel angles and cutting pressures.
2. Is thermal tempering possible?
SCHOTT Restoration Glasses can be thermally tempered. Our application technology department will be happy to assist you with detailed questions. Click here
to open our contact form. 3. Is it possible to produce laminated glass? Processing to laminated glass using conventional PVB films is possible. A thicker film is required to compensate for thickness variations. If a counter pane of float glass is used, the optical impression of the restoration glass diminishes when viewed through. We recommend sampling. If special UV or IR filter films are used for lamination, SCHOTT restoration glass is ideal for glazing museums or sacral buildings with increased lighting requirements in connection with monument protection. Soundproofing foils contribute to the reduction of noise pollution in buildings.
4. Can restoration glass be used for insulating glass?
Insulating glass can be produced using restoration glass. As a rule, the outer pane of the insulating glass is designed as a restoration glass, the inner pane is made of white glass or float glass, if necessary with a thermal insulation coating. Selected restoration glass can also be provided with direct sun protection layers to improve thermal insulation in summer. If 4 mm wide spacers are used in insulating glass, insulating glass with a total thickness of approx. 10 mm can be built. 5. Are there specifications and structural approvals for SCHOTT restoration glass?
The physical, chemical and technical properties of all SCHOTT restoration glass are described in the specifications.
In addition, all SCHOTT restoration glass has the European Technical Approval ETA-12/0159 of the German Institute for Construction Technology, i.e. depending on the thickness of the glass, it can be easily processed into standard construction products such as ESG, laminated safety glass and insulating glass and placed on the market without bureaucracy.