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FREEZE-SAFE
Classified Location
Flexible Heated Mats
for Low Temperature
Applications          

Based on its patented THERMOPOLYMER

®

technology,

Watlow has embedded a safe, low watt density heating
element into a thermoplastic elastomer mat.

Watlow’s FREEZE-SAFE hazardous location Thermo Plastic
Elastomer (TPE) heated mats are custom designed for 
your application in sizes or shapes up to 20 x 25 inch 
(508 x 635 mm). Consult the factory for larger sizes.

FREEZE-SAFE heated mats are designed for use in
classified locations. (Class 1, Div. II, Group A, B, C, D).
Class 1, Div. II are locations where explosive vapor conditions
could exist in the event of abnormal operation, an accident,
or component failure. Flammable gases and liquid groups
(such as acetylene, hydrogen, ethylene, gasoline and
propane) are included in this classification. Refer to articles
500 through 505 of the National Electric Code for more
information on the use of electrical devices in classified
locations.

The hazardous location heated mat can be used in a variety
of ways. These flexible panels provide spot supplemental
heat-tracing while simplifying installation and maintenance.
Nearly any curved 3-D shape can be wrapped with a Watlow
FREEZE-SAFE flexible heated mat. Multiple heaters can be
used to cover the entire surface.

F R E E Z E - S A F E  

© 2007 Watlow Electric Manufacturing Company

Features and Benefits

THERMOPOLYMER heated mats are free from seams 
and joints 

Safe for use in classified and outdoor environments

Mats are hermetically sealed against liquids and
explosive vapors

Prevents nuisance faults

Prevents heater damage due to dangerous leaks

Excellent resistance to UV, non-aromatic fuels, abrasion
and tearing

Provides toughness and durability

Reduced maintenance cost

Allows for easy removal and installation for valve and
pipeline maintenance

Long heater life

Low watt density

Made to fit unusual shapes

Custom designed and molded by the factory to
accommodate curved or other odd shapes

Performance Capabilities

Watt densities from 0.1 to 1 watt per square inch 

Operating wattage from 5 to 350W

Operating voltages from 12 to 48V, 120 or 240V

Ambient operating temperatures from -40 to 24°C 
(-40 to 75°F)

Maximum heater surface temperature 50°C (122°F)

Supplied with 18 gauge, three conductor STOW cord, 
maximum length is 18 inches

UL

®

515 listed

Tested to meet a 5VA flammability rating

Applications

Electrical box heating

Liquid line, cylinder, tube and pipe freeze protection

Petrochemical refining

Power generation water injection

Warming applications

Low temperature processing

Availability

Hazardous location heater panels are custom designed for
your application. Consult factory for details and pricing.

2101 Pennsylvania Drive
Columbia, Missouri 65202  USA
Phone: +1 (573) 474-9402 
FAX: +1 (573) 474-5859
Internet: www.watlow.com
E-mail:  [email protected] 

COL-FRZS-0407

UL

®

is a registered trademark of Underwriter’s Laboratories, Inc.

To be automatically connected to the nearest North American Technical and Sales Office call:

1-800-WATLOW2

International Technical and Sales Offices:

Australia,

+61-3-9335-6449 • 

China,

+86-21-3950-9510 • 

France,

+33 (0) 3073-2425 • 

Germany,

+49 (0) 7253-9400-0 • 

Italy,

+39 (0) 2 458-8841 • 

Japan,

+81-3-3518-6630 • 

Korea,

+82-2-575-9804 • 

Malaysia,

+60-3-7980-7741 • 

Mexico,

+52 (442) 217-6235 • 

Shanghai,

+86-21-3950-9504 • 

Singapore,

+65-6773-9469 • 

Spain,

+34 91 675 1292 • 

Sweden,

+46 35-27-11-66 •

Taiwan,

+886-7-288-5168 • 

United Kingdom,

+44 (0) 115-964-0777

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