Mica Band Information

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               MICA INSULATED
   Main Page                 BAND HEATERS                     Mica Insulated
                                                                                                Strip Heater

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Features
PHP's Mica Band is a unique design developed and is available with and without outer insulation covers in various sheathing materials, viz : S.S, Brass and Mild Steel depending upon applications which provides the best combination of physical strength, high emissivity and good thermal conductivity to heated cylindrical parts, good for sheath temperature up to 300�C.

For maximum connecting surface and protect exposed terminals, a specially designed steel box is affixed on the heater, where the terminal wires are securely fastened to an assuming positive contact with the windings, providing maximum amperage carrying capacity.
A specific gauge nickel-chrome resistance ribbon wire is properly engineered to achieve the lowest winding temperature possible, resulting in maximum heater life. The ribbon wire is evenly spaced wound on specially selected mica strip providing even heat distribution, thus eliminating hot spotting that can cause premature heater failure.
Specially selected mica grade and thickness is used to insulate windings providing excellent thermal conductivity and dielectric strength.
For minimum heat loss PHP Mica Band Heaters are specially made as per customers specification with INSULATED COVER on the outer surface of the Heater.

Available on any screw, lead termination or clamping variation. Used on large cylinders or where heaters cannot be supplied over end of cylinders. Two Piece Band heaters are normally rated at half total wattage and full line voltage. Limitations : Min. I.D. 3", Min. Width 1�"
Available on any screw, lead termination or clamping variation. Used where one piece band heater is desired but must be open for installation.SHOULD NOT BE OPEN AND CLOSED MORE THAN TWICE. Limitations : Min. I.D. 3", Min. Width 1�"
Normally required for clearance of the thermocouple probes or holding bolts. Oversize gaps can in many cases serve the same purpose, using the center of the gap as a starting point, Specify location in terms of degrees and size of the hole or the cut-out. Minimum of �" is required from the hole to the edge of the heater. For critical hole or cut-out locations, please supply detailed drawing.
Rectangular / Square Heaters Square or rectangular heaters, normally used for heating dies on plastic extruders, can be made in one or two piece construction. Two piece are normally rated at half total wattage and full line voltage. Minimum Width Required 1�"

General Information (Precautions)
Band heaters and strip heaters are designed for contact heating and therefore must be tightly clamped to the object to be heated to keep the heater from expanding away from thje surface. The reason for this is that as the heater heats up, it expands away from the surface to be heated causing air gaps and poor heat transfer. Care should be taken to see that the heaters are placed squarely against the surface to be heated. Air gaps between the heated surface and the heater will result in poor heat transfer and shortens the heaters life.

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