100 years for the Charles Costa mirror shop




For 100 years, each of the 4 generations has seen their father invest in the Charles Costa business, without counting his time, deploying a lot of effort and always with passion


We are happy to celebrate this year the extraordinary anniversary of our centenary.


Be sure that the satisfaction of our customers will always remain at the heart of our priorities as well as the respect of commitments with our partners.


I join with all my colleagues in presenting to you our best wishes for health, success and serenity for this new year 2020.



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Sarthe. L’entreprise Grav’Or ce week-end à l’Élysée

L’entreprise mancelle de gravure sur verre, fait partie des 100 entreprises sélectionnées pour l’exposition « Fabriqué en France » qui se déroule les 18 et 19 janvier 2020 à l’Elysée.

Les samedi 18 et dimanche 19 janvier 2020, 100 entreprises françaises – sélectionnées parmi 1 750 dossiers – présenteront le savoir-faire « Fabriqué en France » de 100 départements français, à l’Élysée. L’entreprise mancelle Grav’Or a été retenue pour représenter la Sarthe.

Nommée aux Talents de la Sarthe 2018 dans la catégorie « entreprise », la société de miroiterie et décoration sur verre présentera ce week-end un paravent avec gravure à la main, feuille d’or et laquage en églomisé précise le site de l’Élysée.


Convergence of machines for stone and glass

The arrival of industrial synthetic materials on the stone market has surprising consequences on the machinery market. In fact, we see appearing from certain suppliers who are both on the glass and stone market on the stone machinery market, machines that were once exclusively used on the glass market.


Mainly for two reasons.


1 / These new materials are calibrated in thickness.

So we see machines appearing for polishing the edge (Bavelloni, Intermac, Bovone) similar to those used for glass (rectilinear, double edger).


The gain is much better productivity for running in and polishing the edge.


2 / Some materials are based on glass


We are witnessing the arrival of cutting systems from glass much more productive and easy to use (cutting tables, at Bavelloni, Intermac ...)

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Miroiterie en vente


Perspective départ en retraite une miroiterie de façonnage avec activité menuiserie aluminium et PVC est disponible à la vente.

L'entreprise dont le dirigeant est très connu et présent  sur le marché depuis de nombreuses années  possède un parc machines diversifié et est située dans une ville importante du Sud-Ouest.

Parc machines avec table de coupe, rectiligne, perceuse, machine à bandes...

Equipes de poseurs indépendants.


Pour plus d'informations glass@comascotec.com ou 06 64 73 63 77. Merci


Tools and wheels for glass processing


The tools, mainly the wheels are very important to have a good machine working ( quality, productivity, speed..).

They are several different wheels for differents using and goals

1/Diamond wheels

This wheel must remove the glass to reach the final dimension required and give good surface conditions to prepare the polishing.

There are 2 diiferent types:

-The cup wheels ( wheels with a bowl shape) working with the top flat part

Cup diamond wheels from Lanzetta.

-The peripheral wheels working with the throat

Peripheral wheels from Bavelloni.

With cup wheels you can only obtain flat edge with arises. With peripheral wheels you can obtain all kind of edges, the shape of the throat wheels giving the shape for the glass edge.

There are segmented wheels to process laminating glass or when an important removal is required and wheels with continuous crown in other cases


The efficient part of the wheels is a bond where are located the diamond pieces (artificial diamond) which are able to remove glass. When a wheel needs to remove important glass quantities (from 0.2 mm up to 5 mm) a metallic bond is the best solution. To remove small glass quantities (and clean the surface after diamond wheels with metallic bonds) a bakelite bond is the right choice (from 0.01 mm and more up to 0.2 mm). These bonds are mainly used on beveling machines where the quality of the glass surface before polishing with felt and cerium oxide is very important.

Industrial diamond

A bakelite wheels is always a diamond wheels.

For the diamond the main parameters are the geometry, the grit size and the concentration inside the bond.

The secret to manufacture good diamond wheel is the right balance between the bond and the diamond parameters.

-Polishing wheels for glass and stone processing.

With these wheels you need to:

-remove from the glass surface or edge the lines let by the diamond wheels.

-polish the glass surface or edge to have a beautiful appearance

Polishing wheels from Italmole

The polishing wheels are also constituted with a bond and an abrasive material (generally aluminium oxide). The references for the grit size start with 40 (coarse grit size) and go up to 180 (very fine grit size) for the more important market suppliers.


-Stone wheels

There are wheels which have to remove a minimum glass quantity (in case of seams for example, or with the CNC machines) and to give in the same time a good polishing. They are done with synthetic stone.

Stone wheels from Italmole

-White wheels or Cerium wheels

These wheels are not able to remove glass but only to give a bright polishing to the glass surface or edge.

Cerium wheels from Italmole