Temperature & Watt Density Graphs

 
Surface Temperature versus Time for Silicone Rubber Heaters
Illustrated is the surface temperature of a standard Silicone Rubber Heater, .055″ thick without insulation at several watt densities. The heater is suspended vertically in 70°F (20°C) still air.

Maximum Watt Density

Etched foil elements can be designed at higher watt densities based upon application considerations. Consult Big Chief.

Specifications

The area where leads are attached adds additional thickness depending upon gauge wire used and type. Consult BigChief. Type A Silicon Rubber Heaters.pdf

Dimension Tolerances:
Less than 6″ (150mm); ±.03″ (± .8mm);
6 – 12″ (150mm – 305mm); ±.06″ (±1.5mm);
12 – 36″ (305mm – 915mm); ±.12″ (±3.5mm);
Over 36″ (915mm); ±1%
12″ leads are standard. Gauge of wire to be determined based on amperage or other considerations.

Composite Bonding Processes and other applications may require special heat pattern or uniformity. Heat Mapping Certification is available as an option. Underwriter’s Laboratory and CSA recognition or listing apply to most configurations.

Thickness of Optional Silicone Sponge Insulation:
1/8″, 1/4″, or 1/2″
Thickness of Optional Foil Backing:
0.005″ (0.13mm).

Many applications require special designs and considerations. Big Chief will provide assistance to develop a flexible heater for a specific application.