Backer Hotwatt Standard Cartridge Heaters

U.L. Recognized – E56973
C.S.A. Certified – 016386-0-000

Compressor Crankcase Heating, Copiers, Dies, Food Processing, Glue Pots, Heat Sealing, Hot Melt Adhesive, Labeling, Medical Equipment, Packaging, Photographic Processing, Plastic Molding, Platens, Wax Pots.

• Backer Hotwatt Precision Cartridge Heaters provide localized heat to restricted work areas requiring close thermal control. Dies, Platens, and a variety of other types of processing equipment are efficiently heated. Closely controlled work temperatures up to 1250°F are obtained by a combination of heater location and proper wattage output.
• Basic designs are readily adaptable to a wide variety of special requirements, sizes, or ratings.
• Maximum surface temperatures up to 1250°F.
• Designations are etched on the sheath to preserve accurate shape.
• Heating elements arranged just beneath outside surface for maximum heat transfer, minimum core temperature and faster heating.
• Made in U.S.A.
• Where specified, units can be supplied liquid tight.
• Long, trouble free service.

1. Mica.
2. Series 300 stainless steel sheath of precision dimensions and tolerances for intimate,stable, non-oxidizing contact with cavities machined for them.
3. Element wire situated in close proximity to outside surface for maximum heat transfer and minimum internal temperature while preserving good dielectric qualities.
4. Magnesium oxide packing.
5. Ceramic element support.
6. Ceramic cap.
7. Teflon insulated leads: 1/4″ diameter.
   Fiberglass leads: 5/16″ – 3/4″ diameter.
   Post terminals: 15/16″ – 2 3/8″

Lengths between or longer than those listed may be ordered..

Minimum Wattage –The following table should be used to determine the allowable voltage for low wattage miniature elements:

NA – Not Available

The maximum wattage’s listed are computed at 60 watts per square inch of heated surface. With proper fit in a heat sink, long life may be expected at this watt density. Consult factory for higher watt density applications. Lower watt density will result in longer life. Any wattage within standard limits may be ordered without affecting price.

Standard voltages are either 120V or 240V (subject to limits above). Lower voltages are available.

 All units up to 15/16″ diameter, within published amperage limits, are manufactured with 6″ (type SF1) leads, longer length leads are available. Standard insulation on 1/4″ units is Teflon (200°C); Fiberglass (250°C) is standard on units 5/16″ diameter and larger. All units 15/16″ and larger are manufactured with post terminals (type SF-3). Optional Type SF1 leads are available. Stock units supplied with 12″ leads.

Wattage tolerances are held to +5%, -10% at rated voltage. Diameter is always .001″ less, but not more than .009″ less, than the nominal (fractional) heater diameter except for 1.90″ and 2 3/8″ diameters. This sizing is maintained so that all units are a slide fit into a standard reamed hole of the size ordered. Thermal action will expand the unit to a snug fit for best heat conduction. If close hole tolerances are not maintained, operating life may be drastically reduced. See specific heater size for exact tolerances. Length tolerances are ± 2% with a 1/16″ minimum. Consult factory for closer tolerances.