Polyester Heater

Polyester allows heated elements to have superior heat transfer and exceptionally uniform heat output, which results in a faster warm-up cycle and longer life. Also known as Mylar heater, this can be used to cover large areas with even heat on flat or gently curved surfaces. Polyester can be used with an etched foil or with one of our popular printed polymers.

Etched foil polyester heaters can be designed and fabricated in many types of configurations to fit the size and shape required in your application.

One of our printed polymers is a constant wattage circuit based on low resistance printed silver as the current distributor. The heat is generated by a number of parallel-connected polymer resistors and is therefore very robust and insensitive to small damages. The resistance is virtually constant up 100°C. The constant wattage polymer heaters or mylar heaters are mostly used in low power applications at moderate to high voltage, and can be less costly than metal foil to get the same low power required. The resistance in the polymer can be adjusted in the range from 50 ohm/sq to 50 000 ohm/sq and is therefore suitable for many different applications.

The other printed polymer functions as a PTC circuit also based on low resistance printed silver as a current distributor. The heat is generated by a number of parallel connected polymer resistors with PTC characteristics (Positive Temperature Coefficient). In most cases the polymer resistor is covering the polyester heater completely and hence gives a very even temperature distribution. The PTC effect makes the heater self-limiting and hence hot and cold spots are avoided as the power is generated were you need it.

The printed polymer heaters are also more corrosion resistance than metal heaters.

Etched foil

Heater benefits
- Low wattage
- Distributed wattage
- Edge loss compensation
- Very small sizes of heaters can be precisely
- Economical mass production
- Accurate reproduction of complex circuits

Typical applications of the mylar heater
- Bathroom mirror heater
- De-icing equipment
- Rear view mirror
- Hand grip heater
- Cabinet heater


Constant Wattage Printed Polymer

Heater benefits
- Possible to use on many different substrates
- Robust design insensitive to small damages
- Corrosion resistant
- Large span of resistivity

Typical applications
- Floor heating
- IR targets
- Waterbed heaters
- High Voltage, small area applications


PTC Printed Polymer

Heater benefits
- Self regulation
- Robust design insensitive to small damages
- Corrosion resistant
- Cost effective at low power and high voltage
- More Info

Typical applications
- Rear view mirrors
- Floor heating
- Waterbed heaters
- Low temperature applications, de-icing


Technical Specifications

Max. element temp. °C,(°F)

130 (266)

Min. element temp.°C,(°F)

-60 (-76)

Dielectric strength at 20°C as per ASTM KV/mm


Thermal conductivity at 100°C W/m °K


Moisture absorption as per ASTM D-57063.
(24 hour immersion at 23°C) %


Waterproof as per IEC 335-1 sect. 15-16


Constant of dielectricity at 25°C, 50 Hz


Bending radius, min. mm


Max. element width mm


Power density W/cm2


Resistance tolerance

As standard, ± 10% of nominal. Tolerance down to ± 2%, available

Rated voltage

Up to 690 V AC/DC single or 3-phase