GMC Integrated Grounding Heating Film Series – Structure, Performance, and Installation Explained

Hello, this is Jay Lee from Hi Heat.

Today, I would like to introduce the GMC integrated grounding heating film series,
a product completed after nearly five years of development, patent registration,
and extensive testing.

In this article, we will walk through the structural limitations of conventional heating films,
how GMC overcomes those limitations,
and the key connection methods and precautions you must understand before installation.

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What Is Grounding, and Why Is It Important?

Grounding is a safety mechanism that connects an electrical circuit to the earth
to prevent electric shock and equipment malfunction.

It safely discharges minute leakage currents generated within a product,
preventing situations where a person may experience electric shock
or static electricity when touching the equipment.

Grounding also plays a critical role in protecting both devices and users
by safely releasing current to the ground when abnormal voltage occurs.

Although the probability of an accident may be low,
grounding exists to protect against that remaining
1% or even 0.1% of potential risk.

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Structural Limitations of Conventional Heating Films

The greatest limitation of conventional heating films
is that grounding cannot be implemented within the product itself.

Their basic structure consists of heating layers and electrodes
arranged in a flat form between two PET layers,
leaving no physical space or structure for integrated grounding.

As a result, an additional grounding sheet has traditionally been installed
on top of the heating film and connected to the building’s grounding system.

However, this method often leads to inconsistent contact between the heating film
and the grounding sheet, resulting in uneven leakage current,
loop phenomena, and frequent circuit breaker trips.

For these reasons, grounding sheets have been used only by a small number
of highly experienced installers,
while most heating films in real-world installations
have been used without grounding.

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The GMC Series – Integrating Grounding into the Structure

The GMC series was developed to fundamentally solve these structural limitations.

While the basic heating structure is similar to conventional heating films,
GMC adds a mesh-type grounding layer above the heating layer,
which is then fully laminated with PET.

Because this grounding layer is fully integrated inside the film,
leakage current is immediately absorbed and dispersed,
and electromagnetic fields are effectively reduced.

In other words, GMC is a heating film that
manages electrical safety by its own internal structure.

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GMC Grounding Performance – Verified by Data

The most reliable way to evaluate grounding performance
is through comparison under identical conditions.

When tested alongside household appliances such as refrigerators and microwave ovens,
as well as heating cables, across various current levels,
GMC demonstrated stable leakage current behavior
even as electrical current increased.

The leakage ratio refers to the amount of leakage current per 1 ampere of current,
and GMC consistently maintained a stable range of
approximately 0.05 to 0.12.

This level of performance is comparable to that of everyday household appliances
and indicates a very stable leakage current profile.

Most importantly, the leakage ratio does not increase sharply
under high-current conditions,
which is a key advantage of GMC’s distributed grounding structure.

▶ Watch the GMC grounding performance test video

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Important Installation and Connection Guidelines

The basic installation method for GMC
is almost identical to that of conventional heating films.

The heating film is installed over insulation,
connected in a parallel power configuration,
and controlled using a thermostat.

The key difference is the
“Hi Heat” marked line located on one side of the film,
which indicates the grounding line.

On the side opposite the power connection,
a grounding wire must be connected to this grounding line
and directly linked to the building’s grounding system.

If the heating area is divided into two or more zones,
the grounding must not be combined into one point.
Each zone must be grounded separately.

Combining grounding lines can create potential differences between zones,
leading to leakage current loops and circuit breaker trips.

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Terminal Connection and Cutting Precautions

Unlike conventional heating films,
GMC has a three-layer structure
consisting of the heating layer and integrated grounding layer.

When connecting the power supply,
the terminal must be inserted toward the lower side
where the copper busbar is located,
so that only the copper busbar is clamped.

When connecting the grounding wire, however,
the terminal should clamp the entire heating film.

On the back side of the film,
there are conductive lines connecting the grounding mesh
to the grounding output line.
If these lines overlap with a cutting line,
the film must be cut above or below the marked line,
not directly along it.

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Conclusion

We have reviewed the grounding limitations of conventional heating films,
how the GMC series structurally resolves those issues,
and the key precautions required during installation.

Grounding is not optional. It is essential.

In the past, integrated grounding heating films did not exist.
Today, they do.

IR-Technika will continue to research and improve
safer, more reliable heating films
and develop products that set new industry standards.

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GMC Product Introduction Video

In the video below, you can visually confirm
the structure of the GMC series,
its integrated grounding function,
and the differences compared to conventional heating films.

▶ Watch the GMC product introduction video