Specialising in rotomoulding
for nearly 40 years

For almost 40 years, GROUPE MAILLARD INDUSTRIE (GMI) has been specialising in processing plastic materials using rotomoulding techniques.

From the initial product idea to its series life, the GROUPE MAILLARD INDUSTRIE has the human and technical skills to deliver the most suitable solutions to meet the needs of manufacturers.

GMI supports its customers over the project life cycle: preliminary surveys, research, design, modelling, prototypes, tools; pre series and series.

A finishing workshop completes installations and oversees assembly and controls: gluing, ultrasonic welding; marking – screen-printing- painting, riveting, assembly of accessories and insets…

More than just a rotomoulding sub-contractor, GMI is a genuine project manager able to support its customers in achieving their projects both in France and internationally.

Our skills
at a glance

Integrated design office

Tool creation


Part up to 6000 mm
spherical diameter

PSE PEE foaming

Welding – Assembly


Stages of your bespoke rotomoulding project

Specialists in shaping plastic materials by rotomoulding techniques, GMI has acquired extensive experience and provides its customers with specific support from the consultancy phase right through delivery of the final product.

Les étapes de votre projet en rotomoulage sur-mesure

  • 1

    Eco-design – Industrialisation

  • 2

    Prototype – Tools – Certification

  • 3

    Series production – Assembly – Quality control

  • 4

    Delivery – Stock management

A few examples of our work

Extensive production scope thanks to the experience of our teams and of our production divisions.

Unique skill in the design and production of technical plastic parts from small to large series.

Bureau étude

Design office

With an extensive integrated design office and engineers specialising in rotomoulding, we will support you and carry out a complete project management.

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Conception et réalisation des moules

Mould design and production

In order to ensure the very best results for you, we manage the production of all tools, whether they are produced using boiler making, machining or aluminium foundry techniques.

Centrale de micronisation Unité de coloration

Micronisation centre Colouration unit

Equipped with several micronisation centres and raw material storage silos, we are able to provide our customers with a diverse range of materials to quickly meet the demands of multiple markets.

Rotomoulded parts can be manufactured in different colours by dry colouring or colour matching.

Machines de rotomoulage

Rotomoulding machines

We can meet all your small, medium or large series project needs with 12 rotomoulding lines, the spherical diameters of which vary from 2200 mm to 6000 mm.

Installation de moussage

Foaming facility

To meet the needs of specific markets requiring buoyancy, insulation or other applications, we have a polystyrene foaming facility, as well as a polyurethane foaming facility.

Laboratoire qualité

Quality laboratory

To guarantee our customers consistently high quality manufactured products, we carry out daily raw material analyses (granularity, castability…) as well as ageing tests and chemical and mechanical resistance tests in our laboratory.

Finition, montage

Finishing, assembly

Finishing operations (robotised profiling, machining, drilling…) and assembly (gluing, welding, assembling of accessories) are carried out in dedicated workshops.


Storage and logistics

Finished products are stored in secure warehouses before shipping. We oversee delivery for our customers from these storage platforms for a range of logistics options (B2B, B2C…).



As part of our commitment to the environment, we are committed to recycling rotomoulded parts at end of life thanks to a high-capacity processing and recovery plant.

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The principle and benefits of rotomoulding

  • The principle of rotomoulding

    Rotomoulding is a plastics processing and shaping technique that meets the needs of all markets.

    One of the particular benefits of rotomoulding is that it makes the creation of technical plastic parts of complex, varied and aesthetic shapes possible without gluing or welding (without any risk of leakage).

    It is possible to produce plastic parts in a range of shapes, sizes, colours, appearances, volumes… They can vary in complexity, can be hollow or with sides, with metal inserts…

    The shapes can be simple (spheres, containers) or complex (fuel tanks, automotive parts).

    Rotomoulding is a technique that meets the needs of manufacturers in a wide variety of sectors such as automotive, industry, agriculture, road safety, boating or design …

    Principe du rotomoulage

    From powder to the rotomoulded part

    Rotomoulding is a plastics processing technique whereby a metal mould (aluminium or steel) is filled with plastic (polymer) in powder form. The mould is then subjected to rotation whilst being heated. This causes the plastic to coat the inside of the mould and to take on the shape of the mould. After a cooling phase, the plastic solidifies and can be removed from the mould. The rotomoulded part is ready for use!

    A 4-stage process

    Un process en 4 étapes

    Rotomoulding makes it possible to create a wide range of plastic objects without joins or welding. The production of hollow parts is also possible. These can then be filled with another material (foam, polystyrene…). GMI has a foaming facility which means that we are able to offer you a complete product range.

  • Economical benefits of rotomoulding

    • Flexibility and speed of entering into production
    • Low cost of tools and modifications are possible
    • Competitive procedure for small and medium series.
    • Flexible timing for large series (multi-cavity moulds)


  • Technical benefits of rotomoulding

    • Thickness from 0.5 to more than 20 mm
    • Overmoulding of metal inserts
    • Any colour is possible (bulk colouration and colour change easy to achieve in a single series)
    • Large scale open or closed hollow parts Freedom of shape and design
    • Impermeability of one-piece parts
    • Production of parts in small, medium or large series
    • High mechanical resistance PE (polyethylene) foaming option Multi-layer option
    • Various appearances / finishes: grained or textured…
    • Standard or advertising marking options 100%
    • Recyclable


    Avantages techniques du rotomoulage


  • Plastics used in rotomoulding

    Whilst polyethylene is the most commonly used material, other thermoplastics can also be
    Rotomoulded, including bio-sourced materials.

    The GROUPE MAILLARD INDUSTRIE supports and guides you in choosing the right plastic depending on the characteristics you expect from your finished parts or plastic objects.

    – Shock resistance
    – Anti-fire standards
    – Chemical impermeability
    – Defence standards
    – Scratch resistance
    – Ageing (oxidation, UV, …)
    – Etc…

    Our R&D department develops, in partnership with plastics processing laboratories and research centres, special materials to meet the specific criteria of its customers.

    LDPE (Low density polyethylene)
    MDPE (Medium density polyethylene)
    HDPE (High density polyethylene)
    Polyamide: PA 12, PA 6, PA 6-6 / PA11

    The main characteristics of PE in rotomoulding:

    Shock resistance over a large temperature range
    Chemical inertia
    Electric insulation

    The main characteristics of Polypropylene (PP) in rotomoulding:

    Similar properties to PE with increased rigidity Good
    impact resistance
    Temperature resistance (100°C), up to 140°C at peak Good
    Chemical resistance

    The main characteristics of Polyamide (PA) in rotomoulding:

    Good mechanical behaviour at high temperatures
    Good chemical resistance to solvents, oils, hydrocarbons…

Find out more about our other areas of expertise in plastics processing