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  OUR PRODUCTS
STRIP HEATERS:
MATRUSREE ELECTRO HEATS STRIP HEATERS have proven to be extremely efficient and dependable as a heat source for surface heating in hundreds of industrial and commercial applications.
Mica Insulated Strip Heaters:
Matrusree mica insulated strip heaters are economical heat sources, suitable for providing heat to flat surfaces. The sheath temperature limitation is 900 F. These heaters can be made to include pressure plates that improve uniformity and heat transfer. Matrusree heaters are available in many electrical termination styles, and can accommodate holes and cut-outs.

Matrusree strip heaters were developed to provide longer life at higher watt densities and operating temperatures than the standard Mica Strip heater. Its ceramic insulation provides for minimal air gaps and superior heat transfer efficiency. Better Strips can withstand sheath temperatures of up to 1400 F(760 C) while providing high heat transfer rates and fast heat-up.

The Matrusree strip heater's ability to withstand extremely high temperatures makes it the best choice for many applications, including compression molding, heating of extrusion dies, sealing bars and food processing. In addition, Better Strips can be modified to meet the demands of virtually any special application. Our engineers can utilize a variety of alternative features and options to customize the heater to your specific needs
Design features:
  • Economical
  • Uniform heat distribution
  • Various termination styles
  • Holes and cutouts
  • CSA and CE certified
  • Maximum watt densities; far in excess of other style strips.
  • Highest application temperatures available.
  • Longest life available and the resulting reduction of equipment downtime.
  • High heat transfer rates and fast heat-up.
  • Reduced number and physical size of heaters for many applications
  • Construction:
    Matrusree mica insulated strip heaters utilize the finest quality muscovite and phlogobite mica, different high-grade alloys of resistance wire, and stainless steel sheathes. The proper components are selected and the heater is designed according to the requirements of each application. One critical issue with flat heaters is that they tend to detach from the surface they are mounted on due to thermal expansion. To prevent this, an adequate number of mounting screws should be used at the ends as well as the middle of the heater. Incorporated pressure plates could be used to give rigidity to the top sheet, improve heat transfer, and maintain a uniform heat distribution. The maximum allowable watt density with respect to the application temperature is shown in the diagram. However, 20 watts/in2 is a standard safe value. Matrusree heaters are available in different termination styles, and could accommodate holes and cutouts.
    Sheath :
    Specially treated rust-resistant steel sheath casing provides the best combination of physical strength, high emissivity and good thermal conductivity for sheath temperatures up to 900F (480C). For sheath temperatures up to 1200F (650C), stainless steel sheath is available.
    Screw terminals:
    For maximum connecting surface, the specially designed stainless steel screw terminals are securely fastened to a connecting jumper, assuring positive contact with the windings, providing maximum current carrying capacity
    Mica Insulation:
    Specially selected mica grade and thickness is used to insulate the windings, providing excellent thermal conductivity and dielectric strength.
    Resistance Wire:
    A specific nickelchrome resistance ribbon wire size is properly engineered to achieve the best combination of wire gauge and spacing between turns, thereby providing the lowest winding temperature possible. The ribbon wire is wound on a specially selected Mica Strip, providing even heat distribution for maximum heater life.
    Typical Applications:
  • Packaging and sealing machines
  • Food tables and warming equipment
  • Plastic extruders
  • Blow-molding machines
  • Ovens, hot plates, incubators
  • Food Warming Equipment
  • Packaging Equipment
  • Blow Molding Equipment
  • Testing Equipment
  • Vulcanizing Presses
  • Vending Machines
  • Hot Plates
  • Ovens
  • Molds
  • Kettles
  • Other process
  • ELECTRICAL SPECIFICATIONS:
    Maximum Voltage: 240 Volts
    Maximum Amperage: 25 Amps
    Resistance Tolerance: 10%, 5%
    Wattage Tolerance:5%, 10%
    PERFORMANCE SPECIFICATIONS:
    Maximum Sheath Temperature
    Rust resistant steel: 900F (480C)
    Stainless Steel: 1200F (650C) 
    Nominal Watt Density: 5-45 W/in2 (0.8-7.0 W/cm2)
    Maximum Watt Density: Depends on operating temperature and heater size.
    Screw terminals:
    Screws are the most commonly used terminals on strip heaters. Care should be taken not to tighten these screws excessively; otherwise, the connection between the resistance wire and the screw could be damaged
    Type T1:
    Screw terminals at opposite ends.
    Type T2:
    Screw terminals tandem at one end.
    Type T3:
    Screw terminals parallel at one end.
    Lead Termination:
    Type W1:
    Simple straight leads designed for applications where lead access is only possible from one side on top.
    Type W2:
    Flexible stainless steel braided lead wires exiting at same end. Simple lead arrangement designed for applications where lead access is only possible from one side.
    Type W3:
    Flexible stainless steel braided lead wires exiting at opposite ends. Simple lead arrangement to accommodate applications where lead access is available on both ends.
    Type R1:
    Armor cable provides far superior protection to lead wires where abrasion is a constant problem.
    Type R2:
    SS armor leads exiting 90 with copper elbow Right angle armor cable can be positioned in any direction.
    Terminal boxes:
    Terminal boxes eliminate the risk of electrical shock and electrical short by enclosing the terminal in a heavy duty stainless steel box.
    European plugs:
    European plugs eliminate all possible exposure to live connectors. They facilitate quick replacement
    SPECIAL DESIGNS:
    Mica Strip Heaters can be made into any practical shape and electrical rating. We welcome your inquires.
    INSTALLATION INSTRUCTIONS:
  • Matrusree Mica Insulated Strip Heaters are available with mounting slots at each end for surface mounting applications or without mounting slots for insertion into milled slots.
  • For surface mounting installations, Mica Strip heaters must be clamped securely along their entire length to a smooth metal surface by using metal clamps 3" to 5" apart.
  • Holes along the body of the strip heater for mounting purposes are not recommended and should only be used when there is no other means of clamping the strip heater down. These holes take up valuable winding space, increasing watt density, resulting in poor heater life. When supported by mounting slots, the terminal end should be secured firmly. Opposite end should be slightly loosened to allow for linear expansion.
  • The surface being heated must be clean and smooth for efficient heat transfer. Small air gaps caused by imperfections can cause hot spots, resulting in heater failure.
  • Contaminants such as oil, plastics, and dirt should not be allowed to collect on heaters, as they will find their way into the heater windings, eventually carbonizing and causing electrical shorts.
  • CHANNEL STRIP HEATERS:
    Matrusree's channel Strip heater provides the ability to withstand higher temperatures (typically limited to 40 to 45 watts per square inch, depending on the application). The heater consists of a stainless steel sheath containing high-temperature ceramic insulating a nickel chrome wire coil. The terminals are also constructed of stainless steel and are securely anchored to prevent twisting out under normal conditions. Several terminations are available, including water-resistance.
    Design Features:
  • Low expansion characteristics minimize movement away from block on applications not utilizing full clamping plate.
  • Long life and the resulting reduction of equipment downtime.
  • High heat transfer rates and rapid heat-up.
  • Reduces number and physical size of heaters for many applications.
  • 3-Phase available.
  • Distributed wattage available
  • Electrical ratings:
  • Maximum Voltage: 480VAC (dependent on design parameters)
  • Maximum Recommended Voltage w/Leads: 240VAC
  • Maximum Amperage: lead wire termination: 10 amp
  • Performance Ratings:
  • Maximum Sheath Temperature: 1200F (650C)
  • Nominal Watt Density: 20 W/in2 (3.1 W/cm2)
  • Applications:
    Our Ceramic Strip heaters provide a dependable, versatile and efficient heat source for a wide range of applications, such as heating air, injection and extrusion dies, food tables and platens.some of the typical applications are as follows:
  • Ovens
  • Hot Plates
  • Dies
  • Molds
  • Drying
  • Melting
  • Baking
  • Incubators
  • Platens
  • Food Warmers
  • Welding Preheating
  • Air Heating
  • Sealing Bars
  • Thermoforming
  • Tank Heating
  • Construction Details:
    Sheath: Type 304 Stainless Steel Sheath provides the best combination of physical strength and resistance to high temperatures and chemical corrosion. Dependable at sheath temperatures of up to 1200F (650C).

    Terminal screws: Stainless Steel threaded screws are Standard and are securely fastened (twist proof). Various termination configurations and options are available.

    Porcelain insulator houses: Specially selected and designed porcelain insulator houses the resistance wire coil, insulating it from the outer sheath.

    Resistance wire/coil: Helically wound resistance wire coil made from nickelchrome wire is evenly stretched and precisely strung through the porcelain insulator, providing uniform heat. Resistance wire is then mechanically connected to screw terminals or lead wires for a strong positive joint.

    Mounting Tabs: Channel Strip Heaters are available with or without mounting tabs. If without, the ends are welded shut to prevent moisture and contaminants from entering the heater.

    The basic design consists of helically wound resistance coil evenly strung through specially designed porcelain insulators. Resistance coil is mechanically connected to screw terminals or lead wires for positive connection. Stainless steel rectangular tubing is used to house the heater assembly.The rectangular tube gives full surface contact when used in a milled slot to provide maximum heat transfer area. For surface mounting installations, Channel Strip heaters must be securely clamped along their entire length to a smooth metal surface. When supported by mounting tabs, the terminal end should be secured firmly. Opposite end should be loose to allow for thermal expansion.
    TERMINATIONS:
    Screw Terminations:
    Type T1:
    Each screw terminal is provided at the both ends of the heater.
    Type T2:
    Stainless Steel screw terminals on one end along the length
    Type T3:
    Simple-to-wire Stainless Steel screw terminals well suited for applications where lead access can only be arranged from one side along the width.
    Type T4:
    Simple-to-wire screw terminals designed to accommodate applications where lead access can only be available from one side.
    Lead Terminations:
    Type L:
    Simple lead arrangement designed for applications where lead access is only possible from one side.
    Maximum Amps: 10 at 240VAC. Maximum Volts: 240.
    Type L1:
    Simple straight leads designed for applications where lead access is only possible from one side on top.
    Type W1:
    Wire braid provides strength and protection to the lead wire insulation, offering sharp bending not possible with armor cable
    FINNED STRIP HEATERS:
    Matrusree Finned Strip Heaters are quite proficient and reliable as a heat source for hundreds of industrial and commercial applications. They are used for both forced (mounted in a duct) and natural convection air heating (mounted at the bottom of cabinet type ovens). The Finned Strip Heater's fundamental design consists of a helically wound resistance coil placed in a specially designed porcelain insulator. The resistance coil is mechanically connected to screw terminal for positive connection. Stainless steel rectangular tubing is used to house the heater assembly. Nickel plated steel fins (optional SS) are mounted to the rectangular tubing. The fins have been specially designed to provide maximum surface contact for good heat dissipation into the finned cross sections, thus resulting in rapid heat transfer to the air.

    MATRUSREE Finned Strip Heaters are manufactured in a full line of standard sizes, electrical ratings and terminations, or can be made to your specifications.
    Design Features:
  • Rugged Durable Construction
  • Stainless Steel Sheath
  • Nickel Plated Steel Fins (SS optional)
  • Various Terminations
  • Trouble Free Installation
  • Various Sizes in Stock
  • Constructional Details:
    Material and Dimensions:
    Sheath: 304 Stainless Steel
    Fins: Nickel Plated Steel (Stainless Steel Optional)
    Screw Terminals: Stainless Steel 10-32 UNF Threads
    Electrical Specifications:
    Maximum Voltage: 480VAC (when applicable)
    Maximum Amperage: 22 amps
    Performance Ratings:
    Maximum Sheath Temperature: 1200F (650C) Maximum Watt Density:

    Still AirMax: W/in2Max W/cm2
    Up to 300F (149C)203.1
    300 to 600F (149 to 316C)162.5
    600 to 800F (316 to 427C)101.6
    Moving AirMax: W/inMax W/cm
    At 600 ft./min., up to 200F (3 M/sec., up to 93C)406.2
    At 600 ft./min., up to 400F(3 M/sec., up to 204C)304.7
    At 600 ft./min., up to 600F(3 M/sec., up to 316C)203.1

    Applications:
  • Duct Heating
  • Space Heaters
  • Drying Ovens
  • Food Warmers
  • Shrinking Tunnels
  • Air Heating
  • Heat Curing
  • Dehumidifier
  • Shrink tunnels
  • Heat curing
  • Ink drying
  • Drying ovens
  • Moisture protection
  • Incubators
  • Process welding
  • Load bank resistors
  • Stress relieving ovens
  • Construction:
    The basic design consists of helically wound resistance coil evenly strung through specially designed porcelain insulators. Resistance coil is mechanically connected to screw terminals or lead wires for positive connection. Stainless steel rectangular tubing is used to house the heater assembly

    The rectangular tube gives full surface contact when used in a milled slot to provide maximum heat transfer area. For surface mounting installations, Channel Strip heaters must be securely clamped along their entire length to a smooth metal surface. When supported by mounting tabs, the terminal end should be secured firmly. Opposite end should be loose to allow for thermal expansion.

    The basic materials and method of construction are similar to that of channel strip heaters
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