restauro® - Handmade Window Restoration Glass / Mouthblown Cylinderglass

Genuine Lamberts Restoration Glass (cylinder glass) is specially crafted traditional window glass to meet the requirements for renovation of old buildings, the preservation of historical monuments and restoration of antique furniture.

Until the early 20th century, all window-glass used to be  manufactured by gaffers with blowpipes. Glashütte Lamberts has preserved these production techniques and provides the authentic charakter of historic window-glasses until today.

Mouthblown original Lamberts Restoration Glass is an indispensable part of every glazing restoration, that requires the original air of historic windows.

The special features of our restauro®-window glass:The mouth-blown Lamberts Original Restoration Glass (so-called cylindrical glass / cylinder stretch glass) is an indispensable component of any restoration project which needs to satisfy the requirements for this classic type of glazing.

There are a multitude of further processing options for our mouth-blown window glass. Is can be used as a hardened (pre-stressed) single pane, as an outer pane in insulating glass or as laminated glass.

The result is a perfect symbiosis between contemporary thermal insulation and historically correct appearance.

Handcrafted window glass is used whenever the sharp and hard reflections of machine-made glass are to be avoided in order to preserve or regain the original appearance of historical buildings.

Our handmade and mouthblown restoration glasses restauro® are used in listed and period buildings where the glass must look authentic.  With movement and the occasional bubbles, restoration glass has much more life to it than modern float glass. It is just perfect for sash windows, leaded lights and Orangery windows.

Depending on the period and architectural style (Romanesque / Baroque / Rococo / Classicism / Historicism / Art Nouveau / Bauhaus Style / New Building and Modernism), we offer you the appropriate glass.

Please contact us, we will be happy to assist you with your selection!

Ludwigsburg Castle
Ludwigsburg Castle

Varieties of LambertsGlas restauro®

restauro® Light 2 mm

Without any mold our craftsmen form the glass cylinder by blowing in the blow pit. This gives restauro® Light its smooth surface. Slight distortions and subtle, occasional reams are its prominent feature. Beside the use as window-glass, we recommend restauro® Light 2 mm for furniture-restoration and -glazing.Sizes: ca. 85 x 100 cmThickness: ca. 2 mm 

restauro® Light 3 mm

restauro® Light 3 mm has similar optical properties to restauro® Light 2 mm. Its thickness of 3 mm is suitable for insulation glasses with sizes up to 80 x 85 cm.
Thickness: ca. 3 mm

restauro® Classic 3 mm

Manufactured in old tradition, restauro® Classic 3 mm resembles the authentic look of window glasses from the 17th and 18th century. The distortions in its appearance are pronounced and especially suited for glazings of colonial-style windows and as part of insulation glass for better thermal insulation.
Sizes: ca. 60 x 90 cm
Thickness: ca. 3 mm

restauro® Waldglas

Waldglas is the German term for mouthblown window-glass with a slight greenish coloring that is typically found in original, ancient window glass. restauro® Waldglass can be produced on request as both, restauro® Light and restauro® Classic.

restauro® Extra

For customers that set a stronger value on authenticity we ask our glass-blowers to pay special attention to creating that special look that is typical for original glazings. Distortions are stronger and reams more frequent. Features that mimic glass being produced under much harder conditions, as it was a 100 years ago.
Sizes: ca. 85 x 100 cm
Thickness: ca. 2 - 3 mm

restauro® UV

restauro® UV is the only UV-protection glass where the filter is directly integrated. There is no film, no coating, no lamination. restauro® UV filters daylight and protects against UV-rays below 400nm. It can be used for traditional lead glazing as well as double glazing and laminated glass.
Various dimensions are available on request.

restauro® IR

restauro®IR is a mouth-blown protective glass against infrared radiation in which the protective effect is part of the glass structure. This means that there is no need for additional coating or laminated films.

"quality check restauro(R) ". Here you can see the texture of genuine mouthblown and handcrafted window glass

"Definition of Goetheglass"

The former name of "restauro® - Restorationglass® is Goetheglass"
'Goetheglass' is a mouth blown window glass. It has a light movement and occasional bubbles. The name comes from its use in the 'Goethehaus'
(birth house of Johann Wolfgang von Goethe) in Frankfurt.

Information about the term "Goethe Glass":

Our restauro®-Glass is often also referred to as "real Goethe Glass".

Important note: "Restauration glass" and "restauro®" are our protected trademarks.The term “Goethe Glass” is not trademark protected - therefore please look out for the additional term “mouth-blown” (!) if you want to ensure that you are getting the authentic character of handcrafted glass! Real Goethe Glass is handcrafted and mouth-blown."Goethe Glass is an old, mouth-blown type of window glass (so-called cylindrical glass / cylinder stretch glass). It can have an irregular surface and occasional bubbles. Ideal for use in the restoration of historical glass objects. The name originates from the old window glass in the Goethehaus in Frankfurt."(Source: Hofmann Publishing, Alfons W. Fröhler)

Historical window glass and monument protection

Frauenkirche Dresden, Germany
Frauenkirche Dresden, Germany
Restaurant "Glanzers Michl", Schesslitz, Germany
Restaurant "Glanzers Michl", Schesslitz, Germany
Orangery Schloss Hof, Austria
Orangery Schloss Hof, Austria

The preservation of historically valuable buildings is of great importance today. The window and its effect have a considerable bearing on the appearance of a building facade.

In terms of monument preservation, restoration with preservation glass manufactured according to original procedures is the only safe and correct way!

Alternative, machine-made, historicizing products on the other hand, often clearly disfigure an old building facade!

Glass produced according to the original mouth-blowing procedure fits into the facade easily and unobtrusively. Replacement products from industrial production, on the other hand, are immediately obvious and irritating to the eye, due to the regularity of their appearance and reflection!

The repair and maintenance of historic window constructions requires a high level of craftsmanship and knowledge.

Simply contact us, we will be happy to assist you with your selection!

Gold medal for highest quality


At the Denkmal 2008 - European Fair for Historic Preservation and Restoration, Lamberts Restoration Glasses were awarded the gold medal for achievement of excellence in European Historic Preservation.


Are you interested in our glasses and/or do you need any further information?
Please do not hesitate to contact us:
E-Mail: info(at) / Phone: +49 (0) 9632 - 92510

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