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ECCOSORB® MF Lossy, Magnetically Loaded, Machinable Stock Material Characteristics Related E&C Products • • • • • • Rigid magnetically loaded epoxide stock For increased temperature handling to 260 °C, refer to the electrically equivalent ECCOSORB® MF500F With products such as these, it is necessary to be conversant with the dielectric and magnetic properties of the materials, which are therefore listed in this technical bulletin and are in values normalized with respect to free space, see Typical Properties table Can be machined via many operations, see Machining Recommendations below Does not support fungal growth per MIL-STD-810E • • Applications • • • • • For assistance in termination design, see Termination Design Considerations below ECCOSORB® MF is widely used as absorbers, attenuators, and terminations in waveguides and coaxial lines It has also been successfully used as a high-Q inductor-core material in such devices as slug tuners. It is also useful in many other magnetic components. Simple RF filters can be formed by passing filament leads through small blocks of ECCOSORB® MF, or by casting appropriate sections of the material around such leads by using one of the electrically equivalent castable absorbers. There are also applications in antenna elements and in certain free-space absorbers Availability • • • • • • • • ECCOSORB® MF500F - Electrically similar MF product line but with increased service temperature capability to 500°F ECCOSORB® MF-UHF - Identical physical properties to that of the ECCOSORB® MF product line with altered electrical characteristics for use in the upper UHF band. ECCOSORB® MFS - Silicone rubber sheet, bar and rod stock with electrical properties of ECCOSORB® MF-117 and MF-124 only in the listed stock sizes. Temperature capability to 160°C. Slight flexibility of the material makes it useable in impact applications or where differential expansion between material and metal would normally break the bond to the conventional ECCOSORB® MF ECCOSORB® CR - Epoxy casting-resin version for rigid shapes with electrical properties of ECCOSORB® MF. Good to 180°C. Works well for intricate shapes or cavity filling. ECCOSORB® CRS - Castable RTV silicone rubber like ECCOSORB® CR. Electrical properties of ECCOSORB® MF-117 and MF-124 only. Flexible and tough. Good at high temperature to 260°C Typical Properties Frequency Range 1-18 GHz Color Dark Gray Service Temperature, °F (°C) ® ECCOSORB MF is available in the following standard stock sizes: Sheets 12” x 12” (30.5cm x 30.5cm) in thicknesses of 1/8, 1/4, 3/8, 1/2, 5/8, 3/4, 1.0, 1.5, 2.0, 2.5 & 3.0” (0.32, 0.64, 0.95, 1.27, 1.59, 1.91, 2.54, 3.81, 5.08, 6.35, 7.62 cm). Rods 12” long (30.5cm) in diameters of 1/8, 1/4, 3/8, 1/2, 5/8, 3/4, 1.0, 1.5, 2.0, 2.5 & 3.0” (0.32, 0.64, 0.95, 1.27, 1.59, 1.91, 2.54, 3.81, 5.08, 6.35, 7.62 cm). Bars 12” long (30.5cm) in squares of 1/4, 3/8, 1/2, 5/8, 3/4, 1.0, 1.5 & 2.0” (0.64, 0.95, 1.27, 1.59, 1.91, 2.54, 3.81, 5.08 cm). Other sizes, shapes, thicknesses, and configurations are available on special order. In some cases, depending on which ECCOSORB® MF series is being used, casting of certain configurations can be done during manufacturing. Density, g/cc Durometer, Shore D Tensile Strength, psi (kg/cm2) Thermal Expansion per °C Water Absorption, % 24 hours Thermal Conductivity (cal)(cm)/(sec)(cm2)(°C) (BTU)(in)/(hr)(ft2)(°F)