The Mica Insulated Element
This form of element has no definite forming limitations. Basically the element consist of two components - the element ribbon or wire - the mica former. For most applications an outer metal cover to protect the mica is supplied. Typical applications are:
a) without metal cover - toasters, hairdryers, iron elements.
b) with metal cover - in band and strip form for injection moulding nozzles and platens.
The mica insulated heater is the most versatile of our "special" surface heaters. This form offers a highly uniform heat distribution and can be manufactured to suit confined spaces.
Note: Maximum watts density of 4,6 W/cm2 on working (contact) surface.

Mica band heaters can be round, hexagonal, orrectangular.
Strip heaters can be square, rectangular, "L" shaped or "U" shaped as required

Band Heaters
Band heaters are designed for controlled heating of plastic extruders, injection, cylinder pipes, tanks, drums and other special heating applications. These products are available with:

o Post terminals
o Clamping taps
o Flexible leads
o Holes for control instruments
Size, winding configuration, voltage and wattage can arranged to suit appliance design


Flexible ceramic type
Usually these are in the form of a band heater. These heaters are suitable for uneven surfaces and can also operate at high temperatures. An outer clamp for installing the heater is supplied, this also acts as a guard to protect the ceramics.
Note: The maximum watts density is 6,2 W/cm2 on the contact surface.

Ceramic Insulated Band Heaters
Special Features:

Design Variations - Electrical: Screw terminals are standard
construction. Leads in armor may be specified in any length, with
straight or right angle (RA) strain relief.
Terminal protection box (see illustration) may be ordered.
Following variations are available.
(a) Slot opening
(b) hole (specify size)

Holes - Slots - Cutouts: Holes of any size may be located practically anywhere on heater surface. Thermocouple holes are a common specification on barrel heaters for plastic processing machinery. Slots or cutouts may be specified to clear obstructions.

Gap: Standard gap is 10 mm. A gap greater that 10mm may be specified for thermocuple
insertion or to clear obstruction on cylinder.

Construction: Open spirals of 80/20 nickel-chromium wire eveniy streched and threaded through an assembly of refractory bobbins
Advantages: Heaters can be easily withdrawn from the sheath for
repairs or replacement without disturbing the contents of the tank.
Applications: These heaters provide a large well distributed heating
surface. Different watts densities can be used to achieve rapid heating of water, safe heating of oils and other heat sensitive materials.

Ceramic withdrawable elements are typically found in applications such as hot water tanks, non corrosive chemical tanks and oil or pitch tanks. Available in a wide range of diameter and lengths.
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