Eccosorb®CRS Two-Part Castable Silicone Load Absorber TWO-PART CASTABLE SILICONE LOAD ABSORBER Eccosorb CRS is a series of castable, magnetically loaded, RTV silicone rubber materials with highloss in the microwave frequency range. When fully cured, Eccosorb CRS will duplicate the electrical properties of its counterpart in the Eccosorb® MFS series. For example, Eccosorb CRS117 is electrically equivalent to Eccosorb MFS-117. Being a true elastomer, Eccosorb CRS, when cured, has a number of distinct advantages over rigid materials of the Eccosorb MF type. For electrical and physical properties of the Eccosorb CRS series, please see the datasheet on Eccosorb MF. FEATURES AND BENEFITS MARKETS • 2-component castable • Low outgassing • Commercial Telecom • Security and Defense SPECIFICATIONS TYPICAL PROPERTIES ECCOSORB CRS-117 ECCOSORB CRS-124 Frequency Range Service Temperature °C (°F) Density (g/cc) >1 Ghz <160 (<320) 4.16 >1 Ghz <160 (<320) 4.55 Thermal Expansion Coefficient per °C (per °F) 63 x 10 -6) (35 x 10 59 x 10 -6) (33 x 10 Thermal Conductivity W/mK Hardness, Shore A 0.9 75 1.0 75 Water Absorption, % 24h Dielectric Strength volts/mil <0.1 >10 <0.1 >10 Volume Resistivity, ohm-cm >10 -6 10 -6 >10 10 Data for design engineer guidance only. Observed performance varies in application. Engineers are reminded to test the material in application. APPLICATIONS • Eccosorb CRS can be used to cast cones, wedges and pyramids for terminations and loads. • It can be used to fill cavities or can be painted on surfaces to suppress the flow of currents. This product line finds use in antennas and transmission lines. • Eccosorb CRS can also be poured in place to form microwave gaskets, where a sheet elastomer would not fit. It can also be poured around the base of microwave tubes to prevent undesired energy flow. • When bonded to surfaces, Eccosorb® CRS will withstand temperature cycling (even to cryogenic temperatures). It can be deformed and shaped to contoured surfaces and is not subject to damage from impact or shock. AVAILABILITY • Eccosorb CRS is available in 2 grades : CRS-117 & CRS-124. • Eccosorb CRS is supplied as a 2-part system, consisting of a Part A(resin) and Part B (catalyst). • Please contact your local supplier for available sizes and packages, as there might be some regional differences. Americas: +1.866.928.8181 Europe: +49.(0)8031.2460.0 Asia: +86.755.2714.1166 www.lairdtech.com Eccosorb®CRS • It does not ship as a dangerous good. • Shelf life is approximately 6 months when stored unmixed in a well sealed container at temperatures no higher than 25°C (77°F). INSTRUCTIONS FOR USE • Mix the Eccosorb CRS Part A in its shipping container using a power stirrer to insure homogeneity. • Part A is supplied as a high viscosity paste. In all cases a small amount of Part B has to be added. • Weigh out the desired amounts of both parts in the correct mix ratio as given below. Mix ratio : Eccosorb CRS-117: 100 parts of A to 1.18 parts of B Eccosorb CRS-124: 100 parts of A to 1.00 parts of B • To insure void-free castings, the entrapped air should be removed by vacuum de-airing. • Pour into the cavity to be filled. • Cure overnight at room temperature or for 3 hours at elevated temperatures of 80°C (175 °F). Where use temperature is anticipated above 120°C (248 °F), a post cure is recommended. Gradually raise cast parts to the use temperature over an 8 hour or longer period. • If cast around inserts, they place negligible curing pressures on them. • The Eccosorb® CRS will adhere to themselves but will release from most other surfaces. Therefore, metal or epoxy molds are suitable for cast shapes. If adhesion is required, a thin coat of a suitable primer should first be applied. Typical Attenuation CRS-117 CRS-124 GHz 10- 7 10- 6 10- 5 10- 4 10- 3 10- 2 10- 1 1.0 3.0 dB /c m 0 0 0 0 0 0 .03 0 .27 2 .8 11 dB /in 0 0 0 0 0 0 .08 0 .69 7 .1 28 dB /c m 0 0 0 0 0 0 .03 0 .48 6 .5 20 dB /in 0 0 0 0 0 0 .08 1 .2 16 .51 50 8.6 10.0 18.0 46 56 119 117 142 302 63 67 149 160 170 378 *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 RFP-DS-CRS 011216 Any information furnished by Laird Technologies, Inc. and its agents is believed to be accurate and reliable. All specifications are subject to change without notice. Responsibility for the use and application of Laird Technologies materials rests with the end user. Laird Technologies makes no warranties as to the fitness, merchantability, suitability or non- infringement of any Laird Technologies materials or products for any specific or general uses. Laird Technologies shall not be liable for incidental or consequential damages of any kind. All Laird Technologies products are sold pursuant to the Laird Technologies’ Terms and Conditions of sale in effect from time to time, a copy of which will be furnished upon request. © Copyright 2015 Laird Technologies, Inc. All Rights Reserved. Laird, Laird Technologies, the Laird Technologies Logo, and other marks are trademarks or registered trademarks of Laird Technologies, Inc. or an affiliate company thereof. Other product or service names may be the property of third parties. Nothing herein provides a license under any Laird Technologies or any third party intellectual property rights. 2