Pôle d'activité

Foundry Division

Activity & Expertise

We specialize in precision foundry of light alloys, using gravity sand casting or permanent mold casting

Our expertise, accumulated over 80 years of experience, enables us to handle the most ambitious and urgent projects.

We are recognized for our flexibility, which allows us to effectively manage late changes and modifications. Our mastery of foundry work is also demonstrated through rigorous monitoring at every stage of production, ensuring that we meet our clients’ specific requirements and guarantee the quality of our deliveries.

Our production capabilities are well-suited for casting light alloy parts, prototypes, and aerospace series. We primarily supply the aerospace industry, the defense sector, as well as automotive competition specialists (WRC). Of course, this list is not exhaustive.

With a surface area of 3,500 square meters, our site in Saint-Ouen-l’Aumône features a modern and fully equipped infrastructure to meet all the challenges of foundry work. We have advanced tuning and inspection equipment, including casting simulation software, a spectrometer, a densimetric balance, Porotec, Thermatest, mechanical testing machines, CMM, Faro arm, and more.

At GUILLET Technologies, we produce components ranging from a few grams to over a hundred kilograms, with outstanding characteristics in terms of metallurgy, geometry, mass, and visual appearance. We take pride in offering high-quality foundry solutions that meet the strictest requirements of our clients.

Production & Realization

Foundry molding study is essential for project management and realization.

Upon receiving client data, a feasibility evaluation is conducted to determine technical viability, quality levels, and associated risks. This study allows for close collaboration with the client’s design office, facilitating personalized support in their development. With specialized expertise since 1946, GUILLET Technologies offers responsiveness and know-how while adopting modern tools such as casting simulation, CAD and CAM to improve the design and manufacturing of foundry molds.

Based on a digital design created during our molding study, we have control over every step of our production chain. Once on-site, our challenge is to manufacture “ready-to-pour” molds while managing time and space. The sand, once mixed and prepared, undergoes its transformation until it hardens once manipulated and shaped.


During this time, we primarily visualize the desired part, determining the material flow path that will influence the gating system, risers, and cooling points. The half-molds, once filled and equipped with cores and thermal reaction elements, undergo a series of treatment, bonding, and re-molding with the help of a mold handler.

The furnaces, true sanctuaries of the foundry, receive special attention. They are turned on automatically at night so that the metal is at the right temperature in the morning. They successively benefit operations of purification, degassing, control, and material analysis on multiple test samples. The appropriate temperature for a given melting is ultimately the decisive criterion for successful casting.


When all metallurgical criteria are met and molds of the same aluminum grade are gathered, we can proceed with the casting according to a predetermined order that determines the internal thermal evolution and material flow. The casting temperature is carefully controlled for each mold to guarantee the homogeneity of the batch of parts manufactured.

The demolding of the molds is a moment of truth, a sort of emergence that reveals the true reality, technicality, and new existence of the raw part. The resulting product must then be separated from the casting artifacts (cutting off the risers and gating system), followed by finishing, heat treatments aimed at improving and controlling the mechanical characteristics, and then sandblasting or shot blasting. Finally, meticulous inspections are carried out, to which we pay the utmost attention: mechanical tests, dimensional checks, liquid penetrant testing, radiography, according to our clients’ requirements.



Materials and delivery conditions

The main alloys that we use are:
AS7G03 (Al Si7Mg0,3),
AS7G06 (Al Si7Mg0,6),
AS7U3G Al Si7Cu3Mg),
AS9U3 (Al Si9Cu3),
AS10G (Al Si10Mg),
AU5GT (Al Cu4MgTi).

Delivery statuses can be Y20-Y30 (SF-KF) – Y24 (ST4) – Y23-Y33 (ST6-KT6).


We design and manufacture all our products tailored to our clients.

Here are some examples of our achievements: 

To enhance our development, reduce manufacturing costs, and contribute to environmental protection, we have a thermal sand regeneration unit.

Our sand processing capacity is 0.5 ton/hour, suitable for the considered activity and allowing the combustion of organic components incorporated into the sand during the making of the molds. This reduces our ecological footprint from 150 tons of sand per month to 50 tons per year.

Our laboratories enable us to perform the following controls:

  • Spectrometry
  • Micrography
  • Mechanical Testing
  • Hardness Testing
  • Penetrant Testing
  • Radiography
  • Traditional metrology tools.
  • Ultrasonic Testing
  • 3D Inspection
  • Pressure Testing