DIELECTRIC MATERIALS CHART— ECCOSTOCK® Low Loss Dielectrics Other

DIELECTRIC MATERIALS CHART — ECCOSTOCK .0001 1.00 1.05 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 3 4 5 6 7 8 9 10 15 20 50 100 >100 .0001 .0002 .0003 .0004 .0005 .0006 .0007 .0008 .0009 Properties of common materials from Tables of Dielectric Materials, Vols. IV, V, and VI and Technical Reports AFML-TR-72-39 and 74-250 Laboratory for Insulation Research, Massachusetts Institute of Technology Measurements are 25°C and 1-10 GHz. Properties vary with frequency and temperature. Magnesium Oxide Aluminum Oxide Fused Quartz Polyethlylene TeflonTM ® Low Loss Dielectrics & Other Common Materials .001 .002 .005 .01 .05 .1 1.0 1.00 .0002 .0003 .0004 .0005 .0006 .0007 .0008 .0009 PP DEFINITIONS Dielectric A dielectric is a medium having the property that the energy required to establish an electric field within it is recoverable, in whole or in part, as electric energy. During energy transfer to and from the medium, there is some dissipation of energy in the form of heat. A non-magnetic dielectric material is defined by real and imaginary components of the Complex Permittivity ε* = ε’ – jε” [farads/meter] Normalization of ε* with respect to the Dielectric Permittivity of Free Space εo = 10 –9/36π [farads/meter] gives the Complex Relative Permittivity ε*/εo = k* = k’ – jk" k’ and tan δ indicate capability of storage of electricfield energy and dissipative characteristics for non-magnetic dielectrics. Magnetic dielectrics are additionally characterized by means of µ’ and tan _m which indicate capability of storage of magneticfield energy and of dissipation of energy via magnetic phenomena. Dielectric Constant- k’ is the relative permittivity or dielectric constant. It is the quantity generally referred to as Dielectric Constant in the literature. It is plotted vertically on this chart and is a dimensionless quantity since it is relative to free space. Dissipation Factor (D), Loss Tangent and tan δ are identical. This is the quantity usually reported to indicate the energy loss characteristic of a material. Plotted horizontally on this chart, it is dimensionless and defined as follows: D = tan δ = k"/k’ Loss Factor—k" is the relative loss factor. In the literature, it is usually given as Loss Factor. It should not be confused with Dissipation Factor or Loss Tangent. Note that the Loss Factor is the product of the Dielectric Constant and Dissipation Factor. Lossy Dielectric Lossy dielectrics are characterized by tan δ above 0.1 (approximately). They may or may not exhibit DC electrical conductivity. Dielectric properties usually vary with frequency; in general, the lower the specific DC resistivity, the greater the frequency sensitivity. A frequency response advantageous in many applications of lossy dielectrics is increasing k’ and k" with decreasing frequency. Low-Loss Dielectric Dielectrics with tan δ below 0.01 (approximately) are considered low-loss materials. They are electrical insulators. Dielectric properties show relatively little variation with frequency over microwave range. Natural Dielectric One-component homogeneous dielectric material. Solid natural dielectric types include plastics, metal oxides, glasses, semiconductors (silicon, etc.) and pure single crystals (diamond, sapphire, quartz). Adjusted Property Dielectrics Composite or mixture materials formulated to specific values of dielectric constant and loss tangent. A wide variety of dielectric properties is available to meet design requirements covering a k’ range of 1.02 to 35 in low-loss and lossy dielectrics. Artificial Dielectrics Adjusted property dielectrics containing relatively conductive particles. Artificial dielectrics are light in weight compared to natural or other adjusted property dielectrics at the same dielectric constant. Fillers Fine particle size powdered materials incorporated in a plastic dielectric to improve physical properties. Mica, silica, glass and wood flour are commonly used. 1.05 SH FPH FFP Magnesium Carbonate 1.1 1.2 1.3 1.4 Fir Plywood 1.5 1.6 LOK 1.7 1.8 1.9 Jet Fuel JP-4 Natural Rubber (uncured) 2.0 2.1 2.2 DIELECTRIC CONSTANT HT0003 Polypropylene Butyl Rubber (uncured) CK CTFE FlouroPolymer StyreneButadiene Rubber (25/75) 2.3 2.4 Nitrile Rubber NeopreneTMGN Rubber NylonTM Epoxy Silicone Rubber CPE Polystyrene 0005 cross-linked polystyrene Boron Nitride Borosilicate Glass LexanTM Particle Board Zinc Oxide 2.5 3 4 Fused Silica Mylar TM PyrexTM Glass Mica HiK Cement Soda-lime Glass Molybdenum Sulfide 5 6 7 8 9 Beryllium Oxide HiK Powder Steatite Wollastonite Sapphire Magnesium Titanate 10 15 Zirconia HiK 3-15 3-30 HiK500 20 Pure Water Steak Titanium Dioxide (rutile) 50 100 Strntium Titanate Barium Titanate >100 1.0 .001 .002 .005 .01 .05 .1 LOSS TANGENT Phone: 800-650-5740 Fax: 781-961-2845 Email:sales@eccosorb.com TYPICAL PROPERTIES www.eccosorb.com 28 York Avenue, Randolph, MA 02368 the recognized global leader in microwave absorbing materials