pre-compliance lab

technology in the service of compliance

Compliance assurance,
generation of competitive advantage

Gamma offers state-of-the-art technology and highly qualified personnel to meet the needs of the initial idea and to help the Customer enter the market. The in-house testing laboratory performs accurate and reliable testing on all types of heaters, mounted in household appliances or parts of industrial plants, to ensure compliance with current regulations. With a customized approach, Gamma offers high-quality services to manufacturers with a view to ensuring product safety and gaining a competitive advantage.

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one step ahead

Resistive wire heating bodies for Joule effect

This technology is a reliable and versatile solution for heating air, surfaces, and liquids. Using iron, chromium, nickel, and aluminum alloys, these heating bodies generate heat through thermal dissipation of the resistive wire as the electric current passes through it.

Resistive-wire Joule effect heating bodies are objects composed of an insulating substrate (e.g., mica, steatite, alumina) on which a resistive wire (or strip) is wound and energized in the voltage range up to 600V; they generate heat by means of thermal dissipation obtained by heating the resistive wire during the passage of electric current. Heating bodies turn out to be a semi-assembled component used within another device, and their operation depends on the total operation of the fully assembled device. The heat generated in the final device is typically used for heating air, surfaces, or liquids, and depending on the application for which the device and heating body were designed, the heat is distributed by conduction, convection, or radiation.


- Hair dryers
- Curling and straightening plates (stylers)
- Hair dryer helmets

- Towels

- Irons
- Popcorn machines
- IR heaters
- Fan heaters
- Boilers

- Ironers
- Boilers
- Tin melting pits
- Incubators
- Paint strippers
- Hot Air Guns
- Plastic melting guns

- Sterilizers

types of heating bodies

Historical technology of manufacturing air-exposed bare wire heating bodies, now outdated and obsolete due to low efficiency, difficult miniaturization, poor flexibility, reliability and safety.

Straight wire resistance

The first technology for manufacturing bare-wire resistors exposed to air that enabled the first miniaturization of resistors and the consequent increase in power.

The ease of finding coil-making machines on the market has meant that this technology has become affordable for heater manufacturers worldwide. The difficulty of industrialization of the finished heating body has led to shifting the production of these elements (especially for the consumer market) to countries where labor is less expensive.

Many professional applications still make extensive use of this technology as a result of its flexibility, robustness and proven track record.

The cons of this technology are to be found in the difficulty of industrialization and automation, of the pushed miniaturization, weight reduction, and quality constancy constrained by labor.

Current modern technology for manufacturing bare wire resistors exposed to air.

There are many methods to give the wavy shape to the wire, and there is no common technology among resistor manufacturers.

An established and well-known technique (traditional wave technology) allows a very limited shape ratio h/p=0.6÷0.8 resulting in miniaturization difficulties.

form ratio

Comparison of waves with different shape ratios

Gamma's proprietary high wave technology makes it possible to widen the working range by achieving shape ratios up to h/p(max)=2.5 currently, universally considered, the highest and most unique shape ratio.
In addition to the aforementioned feature, a resistor with high wave technology turns out to be, compared to a similar spiral and traditional wave resistor, lighter, safer and more difficult to counterfeit.

Wave technology lends itself very well to industrialization and automation, thus ensuring consistency in product quality freed from labor.

More and more professional applications are converging on this technology when factors such as innovation, quality, quantity and diversification are crucial to make the product exclusive.

For some applications, the resistive wire is wrapped on an insulating backing:

• micanite plates, when heat exchange occurs by contact
• glass or silicon support, when heat exchange occurs by convection.

The winding on the micanite lamellae is then covered with layers of mica insulating material whose thickness provides adequate electrical insulation while ensuring proper heat transfer. Very important during this assembly is the verification of dielectric strength and the quality of the materials used that maintain this characteristic stable over time.

added value

unique features

Half a century of know-how,
prestigious international partners,
a long tradition of research & development

Gamma differentiates itself through know-how established over 50 years of collaboration with major international brands and a portfolio of 50 proprietary patents.

On the strength of producing more than 2,300 customized heating bodies and finalizing nearly 1,000 specific projects, Gamma is vertically integrated through a well-organized structure.

Collaboration and coordination among departments, such as R&D, Quality Assurance, Production, Purchasing, Sales, Warehouse, Logistics, enable active support service to be provided to the Customer.


commercial information
safety datasheet

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