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[[File:Flex heaters.jpg|thumb|200px|right|Flex heaters]] | |||
'''Flex heaters''' are devices that can be molded to the shape of the heated object. Most flex heaters use a sheath or sleeve as a protective outer covering for the heater elements. | |||
==Features== | |||
Flex heaters differ in terms of features and options. Some products are corrosion resistant, explosion-proof, finned, or portable. Others are suitable for cryogenic use or provide dynamic power regulation. Underwriters Laboratories (UL) and other organizations rate these devices. Indirect fired heaters use a secondary heat exchanger to separate the breathable air stream from the combustion air stream. Features for flex heaters also include overheat protection, independent timing controls, and internal temperature detectors. Flex heaters are silicone rubber heaters with a bonded polyimide power flex-lead. These thin, sturdy and accurate units have the advantages of the etched foil silicone rubber heater; withstand temperature excursions, factory vulcanizing, etc. plus the added flexibility of the polyimide heater in the lead area – making them ideal for demanding applications. The heaters can be designed in the exact shape and size needed allowing the part to conform to a piece of equipment. They are moisture and chemical-resistant providing long heater life. | |||
==Typical Specifications== | |||
===Temperature Range=== | |||
*100°C to 200°C (FEP) | |||
*100°C to 350°C (Polyimide) | |||
===Insulation=== | |||
*FEP construction | |||
*Polyimide construction | |||
===Resistance Tolerance=== | |||
±10% | |||
===Watt Density=== | |||
up to 40 W/in2, typical | |||
===Thickness=== | |||
0.010" maximum over heater | |||
===Flexibility==== | |||
0.3" minimum bend radius | |||
==Common Types== | |||
===Silicone and Kapton Flexible Heaters=== | |||
Rugged, reliable, accurate, and moisture/chemical-resistant. Silicone and Kapton flex heaters can be easily bonded or adhered to other system parts. | |||
===Enclosure Heaters & Flexible Heating Blankets=== | |||
Prevent freeze and condensation, improve heat transfer, speed warm-ups and increase the capacity for higher watt density. Flex heaters offer superior tensile strength and tear resistance, with precision heat distribution. They are also ideal for applications with extreme temperature environments, -319°F to 392°F (-195°C to 200°C). | |||
===Silicone Flex Heaters=== | |||
Silicone Flex Heaters are rugged, reliable,accurate, and moisture and chemical-resistant. They can be easily bonded or adhered to other system parts. | |||
Silicone Rubber heaters permit composite bonding and curing, as well as repair and fabrication operations. Equal length circuits and a cool tab are provided, while a fiberglass reinforced heater cover means long service life and increased durability. Standard watt density is 5W/in2 (0.8W/cm2). | |||