ECCOSORB CRS ECCOSORB CRS High-Loss, Two-Part Castable RTV Silicone Absorber Material Characteristics Instructions for Use Castable RTV silicone rubber with high-loss in the Part A is supplied as a high viscosity paste. In all microwave frequency range. Dark gray in color. cases a small amount of Part B is added. See table below for actual mix ratios by weight When fully cured, ECCOSORB CRS will duplicate the To insure void-free castings, the entrapped air should electrical properties of its counterpart in the be removed by vacuum de-airing ECCOSORB MFS series. For example, ECCOSORB The mixture converts to flexible, high temperature CRS-117 is electrically equivalent to ECCOSORB silicone rubber at room over night or elevated MFS-117. temperatures of 175 F for 3 hours. Where use Being a true elastomer, ECCOSORB CRS when cured, temperature is anticipated above 250 F (121C), a has a number of distinct advantages over rigid post cure is recommended. Gradually raise cast parts materials of the ECCOSORB MF type. to the use temperature over an 8 hour or longer For electrical and physical properties of the period ECCOSORB CRS series, please see the Technical If cast around inserts, they place negligible curing Bulletin on ECCOSORB MF. pressures on them Frequency range from 1 - 18 GHz The ECCOSORB CRS will adhere to themselves but Low out-gassing properties will release from most other surfaces. Therefore, metal or epoxy molds are suitable for cast shapes. If adhesion is required, a primer must first be used Applications Members of the ECCOSORB CRS series can be ECCOSORB CRS can be used to cast cones, wedges, bonded to other materials with ECCOBOND TP-50. A and pyramids for terminations and loads wipe-on coat of ECCOBOND TP-50 will give cast or It can also be used to fill cavities or be painted on molded pieces extra environmental protection surfaces to suppress the flow of currents. Therefore, ECCOSORB CRS finds use in antennas and transmission lines. It has also been poured around the Typical Properties base of microwave tubes to prevent undesired energy flow CRS-117 CRS-124 ECCOSORB CRS can also be poured in place to form Density, g/cc 4.16 4.55 microwave gaskets When bonded to surfaces, ECCOSORB CRS will Max. Service Temperature, F (C) 320 (160) 320 (160) withstand temperature cycling (even to cryogenic -6 -6 Thermal Expansion, F (C) 35 x 10 33 x 10 temperatures). It can be deformed and shaped to -6 -6 (63 x 10 ) (59 x 10 ) contoured surfaces and is not subject to damage from Thermal Conductivity, impact or shock 2 (cal)(cm)/(sec)(cm )(C) 0.0021 0.0024 2 (BTU)(in)/(hr)(ft )(F) 6.0 7.0 Hardness, Shore A 75 75 Availability ECCOSORB CRS is supplied as a two component Water Absorption, % 24 hours <0.1 <0.1 system consisting of a Component A and Component B Dielectric Strength, volts/mil >10 >10 in 2 pound (quart) and 8 pound (gallon) kits. It does (Kv/cm) (>4) (>4) not ship as a dangerous good. 10 10 Volume Resistivity, ohm-cm >10 >10 Both CRS-117 and CRS-124 are available in premixed and frozen 5cc, 10cc, and 30cc syringes. No Mixing is Relative Impedance, Z/Zo 0.3 0.4 needed. Note: Premixed and frozen packaging Mix Ratio by weight, A:B 100:1.18 100:1 requires storage at 40F (-40C) and shelf life is 3 months. Minimum buy is 100 syringes for any size. Shelf life is approximately 6 months when stored unmixed in a well sealed container. This material can be stored frozen to increase shelf life. EMERSON & CUMING MICROWAVE PRODUCTS, INC., 28 York Avenue, Randolph, MA 02368 / Telephone (781) 961-9600. Use of Information and Material: Values shown are based on testing of laboratory test specimens and represent data that falls within normal range of the material. These values are not intended for use in establishing maximum, minimum or ranges of values for specification purposes. Any determination of the suitability of the material for any purpose contemplated by the user and the manner of such use is the responsibility of the user. The user should determine that the material meets the needs of the user s product and use. We hope that the information given here will be helpful. It is based on data and knowledge considered to be true and accurate and is offered for the user s consideration, investigation and verification but we do not warrant the results to be obtained. Please read all statements, recommendations or suggestions in conjunction with our conditions of sale INCLUDING THOSE LIMITING WARRANTIES AND REMEDIES, which apply to all goods supplied by us. We assume no responsibility for the use of these statements, recommendations or suggestions nor do we intend them as a recommendation for any use, which would infringe any patent or copyright. Emerson & Cuming Microwave Products Inc. Revision: 10/8/2008 www.eccosorb.com A25 Typical Attenuation -7 -6 -5 -4 -3 -2 -1 GHz 10 10 10 10 10 10 10 1.0 3.0 8.6 10.0 18.0 CRS-117 dB/cm 0 0 0 0 0 0.03 0.27 2.8 11 46 56 119 dB/in 0 0 0 0 0 0.08 0.69 7.1 28 117 142 302 CRS-124 dB/cm 0 0 0 0 0 0.03 0.48 6.5 20 63 67 149 dB/in 0 0 0 0 0 0.08 1.2 16.51 50 160 170 378 *Note: Attenuation is a theoretical property calculated from the Complex Permittivity and Complex Permeability of a lossy material and is strictly a means of comparing one absorbing material to another. The attenuation properties are not an indication of how the material will perform inside a microwave device. For further electrical and physical properties of the ECCOSORB CRS series, please see the Typical Electrical Properties Table on the ECCOSORB MFS technical bulletin EMERSON & CUMING MICROWAVE PRODUCTS, INC., 28 York Avenue, Randolph, MA 02368 / Telephone (781) 961-9600. Use of Information and Material: Values shown are based on testing of laboratory test specimens and represent data that falls within normal range of the material. These values are not intended for use in establishing maximum, minimum or ranges of values for specification purposes. Any determination of the suitability of the material for any purpose contemplated by the user and the manner of such use is the responsibility of the user. The user should determine that the material meets the needs of the user s product and use. We hope that the information given here will be helpful. It is based on data and knowledge considered to be true and accurate and is offered for the user s consideration, investigation and verification but we do not warrant the results to be obtained. Please read all statements, recommendations or suggestions in conjunction with our conditions of sale INCLUDING THOSE LIMITING WARRANTIES AND REMEDIES, which apply to all goods supplied by us. We assume no responsibility for the use of these statements, recommendations or suggestions nor do we intend them as a recommendation for any use, which would infringe any patent or copyright. Emerson & Cuming Microwave Products Inc. Revision: 10/8/2008 www.eccosorb.com A25