Description The C3400 Series Kapton® Insulated Flexible Heaters contain etched, resistive foil encased between two layers of Kapton. The Kapton Insulated Heaters use an acrylic, thermoset bonding adhesive, while the High Temperature Kapton Insulated Heaters use a Teflon® bonding adhesive. Heater trace patterns are specific to customer requirements. The C3400 Series may also be bonded to other system parts or combined with other Honeywell thermal products such as thermostats, RTDs (Resistive Temperature Devices) or thermistors. These heaters are often used in applications where thin profile and/or low material outgassing are important considerations.