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


Cutting oils for flat glass processing


Why to use cutting oil?


The glass cutting is generally done in 2 steps


1/Achievement of a crack on the glass surface

2/Breaking with a mechanical action, moves the crack up to the other side of the glass.

For glass under 10 mm, the breaking is not necessary because the glass is completely cut (open cut).

The cutting is done by a diamond tool (mini disk).

The parameter to adjust to have a good cutting

-The tool angle with the glass surface

-The cutting speed

-The cutting pressure

-The tool diameter


The crack must be perpendicular to the glass surface, and without  (no other crack starting from the main crack)

The tool cuts the chemical links between the silica atoms. But the glass is a viscous material. So depending the temperature, the time before cutting and breaking some links can be created again, doing the breaking more difficult.

Moreover during the cutting some very small glass pieces can link with the surface or create scratches on the glass.


Glass oil cutting action

-Improves the crack quality (direction, less alternative cracks)

-Prevents the new silica links

-The glass surface lubrication decreases the scratches number and improves the life duration for the cutting tool.

-The small glass pieces created during cutting remain next to the cutting area.



Glass cutting oils different types

At the beginning were only used mineral cutting oils. But they were difficult to remove and let marks on the glass during the following processing (tempering, laminated glass cutting, fusing…)

After washable cutting oils were proposed.

But if these cutting oils were not removed before the following processing they let also marks on the glass during heat treatments or polluted other processing.

Then evaporable cutting oils were designed.

With variable time before the evaporation to have the best efficiency

The cutting oils must not affect the material where they are used (wood, plastic, cutting table carpet…), Low e glass, mirrors….And more important the operators.


There are a lot of different cutting oils depending the glasses thickness, the cutting type (straight or shaped..).