FRIEDR. FREEK GMBH - Electric Heating Elements

The Nomex heating band is an inexpensive solution for applications where a flexible heating element with low power (max. 1 W/cm²) and for max. temperatures of 150 °C is required. A well-established application is it's utilization as standstill heater to prevent condensation and frost damage when motors stand idle in cold environments. Standstill heaters reliably keep motors or electrical machines above the dew point and ensure safe operation even in harsh ambient conditions. The minimum width of the heating element is 12 mm with a maximum length of 1000 mm, bending radii of at least 15 mm are possible.

Flexible Polyester Heaters consist of a conductive ink between two insulation layers of polyester. The heater can be pressed on or fixed with a self-adhesive foil. Wrapped in PVC the use in liquids is possible as well. Typical standard applications are e.g. mirror heaters, water bed heaters, or low temperature room heaters. For terrarium and aquarium heaters we offer standard elements as well.

We offer an extensive range of drum and barrel heaters and container heaters: Heating jackets, silicone drum heaters, base drum heaters and insulating but unheated drum jackets and lids for heating and insulating plastic and metal drums respectively containers. According to the destined application we use polyester, silicone, teflon and glass fibre for our drum heaters and container heaters. Some of the materials are coated and multi-layered resp. combined. Our drum heaters can be used individually and in combination and can be ordered and delivered online (shop.freek.de) for all standard drum sizes (25 / 50 / 105 / 200 litres). Of course, we also manufacture our heating jackets, heating sleeves, base heaters and insulating bonnets individually to fit your container and your special application. HC - Heating cabinets If you heat several drums or containers together or need a container heater for the ATEX area, the heating cabinets from our partner Amarc are the right choice.

Silicone heaters and Kapton heaters are preferred surface heating elements for laboratory equipment and medical technology due to their easy handling and variety of shapes. Like Kapton polyimide heating foils, silicone heaters are resistant to continuous temperatures of up to 200 °C, with self-adhesive foil up to 180 °C. When designing silicone heaters and Kapton foil heaters, the designer has almost unlimited degrees of freedom. This applies to the minimum and maximum dimensions, which are set within wide limits, as well as to contours and recesses, holes and feed-throughs of any kind. The good shape flexibility of silicone heating mats and foils as well as Kapton polyimide heaters also enables the heating of cylindrical, conical or rounded surfaces. The resistance of polyimides to fungi, bacteria, ozone, weather, ageing and most chemicals, acids and solvents is very good, making polyimide (Kapton) heaters an ideal solution for many critical applications.

We can offer flexible heating elements manufactured from three different insulation materials: silicone, polyimide (Kapton) or polyester. Each of these materials possess different properties which make them suitable for diverse applications. Silicone heaters can also be produced in very large sizes, whereas polyimide is significantly thinner and polyester unbeatable in price when it comes to high quantities. All three of them are bespoke products made according to your needs, so within the bounds of what is technically feasible you as the customer can determine almost every feature of your heater. This can include; voltage, wattage, dimensions, shape, sensors, leads, plus much more. Due to their low thermal mass flexible polymer insulated heaters distinguish themselves by a very short response time and excellent controllability.

In linguistic usage occasionally the terms coil heaters, nozzle heating elements, hot runner heating elements, cable nozzle heaters are used. Our HotMicroCoil heating elements can be used in a wide variety of applications. Their high level of plasticity ideally suits them to the heating of hot runner nozzles and for accurately heating the contours of three-dimensional surfaces. Many of our customers order HotMicroCoil elements in their unformed state of mineral insualted cable heaters and perform the subsequent shaping work themselves, while others commission us to shape and fit the heating cable elements. A large number of ready-to-fit heating solutions are available for plastic injection nozzles with clamping mechanisms, housing bezel, reflection tube or heat conduction sleeve.

Freek pump and gas line heaters for trace heating are designed to regulate temperatures in order to prevent freezing or condensation in the line. As with all our heaters, these can be designed and produced to your bespoke specifications. A most frequent application for gas & pump line heaters the semi-conductor process in which gases such as Tetraethyl Orthosilicate (TEOS), Boron Trichloride (BCl3), Aluminium Chloride (AlCl3), Chlorine Triuoride (ClF3) and Dichlorosilane (DCS) condense at low temperatures. Should this occur, it could result in wafer defect. Gas and pump line heaters consistently heat the lines and provide a simple heating solution and prevent condensation build up. The optimum line temperature will vary depending on the process.

Preformed silicone heaters are useful for diamters as small as 12 mm and up to 100 mm. Rounded silicone heaters are not possible with self-adhesive foil. Spiral Wrap Pre-Formed Silicone Rubber Heaters are suitable for tubes and flexible pipes and hoses with Ø 6,35 mm (1/4"). Spiral formed flex heaters can be used up to Ø 12 mm (the length of the stretchable silicone spiral wrap heater is reduced accordingly). The thickness of our spiral-wrapped silicone strip heaters is 2,2 mm. Also our gas and pump line heaters, most frequently used in the semi-conductor process, are shaped and pre-formed according to the object geometry to be heated. They are designed to regulate temperatures in order to prevent condensation in the line. Current applications here are Semi Conductors, Vacuum Chambers, Wafer Chucks, Valves, Exhaust & Pump Systems.

The Freek heat transfer nozzle heater type especially addresses manufacturers and users who operated their hotrunner nozzles with cast-in heaters in the past and would like to stick to their engineering know-how without paying the high price of this former heater design. The standard material of our patent pending Freek heat transfer alternative is brass, with or without coating, basically with a slit. Characteristics of our HotMicroCoil nozzle heaters sheathed by a reflection tube are easy mounting and variable heat distribution. Because of its direct touch and toleranced fit, the heater allows a very good heat transmission to the nozzle. In all our HotMicroCoils with reflection tube the assembly of a thermocouple is possible and recommended for bigger diameters and power. Also most common nozzle heater solutions are HotMicrocoil heating elements with clamp bands with diverse locking mechanisms.

Advantages of Heating Plates with Square Cartridge Heaters: -> Simple plate manufacture due to rectangular groove geometry, no deep-hole boring -> Simple heater installation by bending and pressing along the plate surface -> Complex plate geometries with bores and openings -> Optimal heat transfer due to 75% surface contact -> No casting with heat conductive compound -> Uniform temperature profiles due to thermally optimized groove layouts/power distribution and utilization of insulation plates -> high process temperatures (up to 450°C in aluminium, up to 700°C in stainless steel) Example "Heated Stamp": D=100 mm out of tempered tool steel up to max. 700°C continuous temperature. Fitted with 2 Square Cartridge Heaters 1500 W/ 230 V, 4,5 x 4,5 mm x 600 mm, with 50 mm unheated at the termination end. Annealed and formable with a nickel sheath, resistant up to 850°C surface temperature. Connection by fibreglass insulated pure nickel high-temperature leads (max. 500°C)