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W A T L O W
Flexible Heaters
HT Foil
This high temperature etched foil
heater from Watlow is designed for
demanding applications requiring
operating temperatures up to1100°F
(595°C). The heater, only 0.030 inch
(0.76 mm) thick, is insulated with a
mica sheet. The heater is fairly rigid
and must be securely and uniformly
clamped from both sides for support
and good heat transfer during
operation.
Performance Capabilities
• Operating temperatures to 1100°F
(595°C)
• Watt densities to 110 W/in
(17 W/cm2) when operating at
500°F (260°C). Watt density
should decrease as temperature
increases.
Features and Benefits
• High temperatures and watt
densities for more demanding
applications.
• Fast heat-up due to thin
construction and low mass design.
• Easy to design in circular or
complex two-dimensional shapes.
• More uniform part temperatures
are possible with etched foil zoned
heating.
Applications
• Semiconductor industry: wafer
processing equipment
• High temperature platens for
laminating presses
2
0.014" (0.36 mm)
Thick Mica Insulation
Flexible Heaters
0.030" (0.76 mm) Thick Heater
with Etched Foil Element
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Flexible Heaters
HT Foil
Applications and
Technical Data
Installation and Mounting
The HT Foil heater is designed to be
permanently clamped. If the lead
connection points are within the
clamped area, a relief in one of the
clamped surfaces is required to
allow adequate clamping of the
active heater area.
For further details on mounting
methods, see Watlow technical
letter #6, flexible heaters.
General Specifications
Although Watlow doesn’t stock
HT Foil heaters, there are several
specifications common to most of
the custom designs. They include:
• Thickness over heated area:
0.030 inch (0.76 mm)
• Thickness over lead connection
area:
0.200 inch (5 mm)
• Dielectric strength—volts ac,
minimum:
1000VÅ(ac)
• Maximum operating temperature:
1100°F (593°C)
• Maximum allowable watt density
at various temperatures:
1000°F(540°C) 20 W/in2 (3.1 W/cm2)
900°F(480°C) 40 W/in2 (6.2 W/cm2)
800°F(425°C) 60 W/in2 (9.3 W/cm2)
700°F(370°C) 75 W/in2 (11.6 W/cm2)
600°F(315°C) 90 W/in2 (14 W/cm2)
500°F(260°C) 110 W/in2 (17 W/cm2)
• Lead wire —Type MGT 600 volt
with Nickel clad Cu conductor:
840°F (450°C)
Options
The following options are possible
with HT Foil heaters from Watlow:
• Holes, cutouts, and notches
• Zoned wattage
Detailed information on holes, cutouts and notches can be
found on page 166 in the Flexible Shapes and Geometries
section.
How to Order
All HT Foil heaters from Watlow are
made-to-order. Please provide the
following application information to
place an order or request a quote:
• Size (dimensions)
• Voltage
• Wattage/watt density
• Operating temperature
• Options (holes, zoned wattage)
• Quantity
F.O.B.: Columbia, Missouri
Availability
Consult factory
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