* * * * * Conductive elastomers * Knitted wire mesh Conductive coatings, sealants, adhesives Cable shielding products * EMI/ESD shielding laminates Shielded vents and windows FCC/VDE and TEMPEST testing LEADER IN EMI SHIELDING INNOVATION, DESIGN, AND TEST TECHNOLOGY TECHNICAL BULLETIN 202 CHO-FAB and CHO-FOIL TM (R) Family of EMI Shielding Tapes with Conductive Adhesive CHO-FABTM tape is a corrosion resistant nickel-plated cloth coated with Chomerics' highly conductive pressure-sensitive adhesive. This adhesive contains a uniform dispersion of conductive particles that create a very low electrical resistance through the tape. This feature results in superior shielding performance in a wide variety of environmental conditions. CHO-FAB tape is extremely strong, lightweight and has excellent conformability/wrapability to enhance shielding performance and appearance. Use of corrosion resistant nickel-plated cloth and Chomerics' superior metalparticle-filled conductive adhesive technology produces a tape used in a wide variety of EMI shielding and grounding applications. CHO-FOIL(R) tapes are an economical EMI shielding solution for a variety of commercial uses. The tapes are available in copper, aluminum, or tinned copper foil backed with Chomerics' highly conductive pressure-sensitive adhesive. The copper version of CHO-FOIL tape meets the requirements of MIL-T-47012 and the tinned copper foil tape meets MIL-T-10727 for corrosion resistance. CHO-FOIL and CHO-FAB shielding tapes are available in standard 36 yard length rolls, and die cut custom configurations.* For applications requiring surface conductivity only, copper tape is available with a non-conductive adhesive. TYPICAL APPLICATIONS * * * *AnembossedversionofCHO-FOILcoppertapeisavailablefora moreattractivesurfaceappearance. Provides a low impedance connection between a braided cable shield and the metal connector backshell in molded cables. An effective EMI shielded assembly can be achieved without soldering the tape to the braid or backshell. EMI radiation measurement troubleshooting, using CHO-FOIL tape to shield ventilation slots or seam gaps. Provides electrical continuity in seams of EMI shielded rooms and electronic enclosures. * Supplies electrical contact to surfaces that can't be soldered to, such as conductive plastic or aluminum. * EMI shield for cables by wrapping the tape around the cable. An overlap is recommended. * ESD shielding. * Provides corrosion-resistant ground contact points. * Fabric tape available where weight and flexibility are important such as for wrapping cables. continued CHO-FAB and CHO-FOIL(R) Family of EMI Shielding Tapes With Conductive Adhesive continued TM APPLICATION NOTES 1. To ensure maximum adhesion, remove all surface oils and dust from the areas to be taped. 2. When applying the tape, note that oils from the hand can affect adhesion. 3. These tapes are compatible with industry standard tape dispensers. Technical Data PROPERTY TEST METHOD TYPICAL VALUES Part Number Prefix -- CCH CCE CCJ Fabric/Foil Type -- 1 oz. RA Copper 1 oz. embossed RA Copper Aluminum Fabric/Foil Thickness, mils (mm) -- 1.4 (.036) 1.4 (.036) 2 (.051) Adhesive Type -- Adhesive Thickness, mils (mm) -- Total Thickness, mils (mm) -- Temperature Range, F (C) __ CCD CAD CFT Aluminum Nickel Plated Cloth 1.6 (.041) 2 (.051) 5 (.127) 2 sides: 1.5 each (.038 each) 1.5 (.038) 1.4 (.036) Particle Filled Acrylic Pressure Sensitive 1.5 (.038) 2.9 (.074) 4 (.110) 3.5 (.089) 3.1 (.079) 4.4 (.112) 5 (.127) -40 to 400 (-40 to 205) Electrical Resistance, MIL-STD-202C <.003 (.0004) ohms/in2 (ohms/cm2) Flame Resistance CCK 1 oz. Tin1 oz. Plated Copper RA Copper UL Subject 510 <.003 (.0004) PASS 6.5 (1.651) -40 to 180 (-40 to 82) <.010 (.002) <.003 (.0004) <.010 (.002) <.010 (.002) <.100 (.020) MEETS PASS Adhesion to Aluminum ASTM D1000 oz./inch [ppi] (N/m) PASS MEETS MEETS >40 [2.5] (438) ORDERING INFORMATION Standard rolls can be ordered through Chomerics' authorized distributors using these part numbers: CCH - 36 - 101 - ZZZZ Copper foil, conductive adhesive CCE - 36 - 101 - ZZZZ Copper foil, conductive adhesive, embossed CCH - 36 - 301 - ZZZZ Copper foil, non-conductive adhesive CCJ - 36 - 201 - ZZZZ Aluminum foil, conductive adhesive CCK - 36 - 101 - ZZZZ Tin plated copper foil, conductive adhesive CCD - 36 - 101 - ZZZZ Copper foil, conductive adhesive 2 sides CAD - 36 - 101 - ZZZZ Aluminum foil, conductive adhesive 2 sides CFT - 36 - 101 - ZZZZ Nickel-plated fabric, conductive adhesive ZZZZ = WIDTH 0050 0100 0150 0200 0300 0400 0600 0800 1200 2400 0.5 in. 1.0 in. 1.5 in. 2.0 in. 3.0 in. 4.0 in. 6.0 in. 8.0 in. 12 in. 24 in. 102mm 152mm 203mm 305mm 610mm 12.7mm 25.4mm 38.1mm 50.8mm 76.2mm (Other widths available up to 24 in. [61 cm]) Please consult Chomerics' Applications Engineering Department for assistance with a custom application involving a need for material in other than slit roll form. Tel: 781-935-4850 Fax: 781-933-4318 N/A NOTE: The following table represents actual experimental test data taken according to Chomerics internal test procedures. This data differs from the previous table due to differences in test methods. Table A: Reliability Data TEST TEST METHOD Initial Surface Resistivity (SR) (milliohms)* CHO-TP-57*** Initial Through Resistivity (TR) (milliohms)* CHO-TP-57*** <3 Initial Peel Strength OZ./inch [ppi] (N/m)** ASTM D1000 44.8 [2.8] (490) Initial Taber Abrasion Surface Resistivity (SR) (milliohms) CHO-TP-57*** <6 Heat Aging 185F (85C)/ 168 hrs. SR (milliohms)* TR (milliohms)* Peel, OZ./inch [ppi] (N/m)** CHO-TP-57*** CHO-TP-57*** ASTM D1000 <10 <2 <20 <2 N/A <16 <3 <22 <2 <7**** 57.6 62.4 76.8 67.2 73.6 [3.6] (630) [3.9] (683) [8.0] (840) [4.2] (735) [4.6] (805) N/A <100 <60**** <150 78.4 59.2 [4.8] (840) [3.7] (648) Heat Aging 250F (121C)/ 168 hrs. SR (milliohms)* TR (milliohms)* Peel, OZ./inch [ppi] (N/m)** CHO-TP-57*** CHO-TP-57*** ASTM D1000 <10 <3 <20 <2 N/A <70 <3 <23 <2 <3**** 57.6 59.2 75.2 51.2 70.4 [3.6] (630) [3.7] (648) [4.7] (823) [3.2] (560) [4.4] (770) N/A <100 <10**** <150 84.8 43.2 [5.3] (928) [2.7] (473) Heat Aging with SR (milliohms)* Humidity 95% RH/ TR (milliohms)* 185F (85C)/ Peel, OZ./inch [ppi] (N/m)** CHO-TP-57*** CHO-TP-57*** ASTM D1000 N/A N/A N/A N/A N/A N/A N/A N/A N/A <2 N/A <2 <115**** 78.4 78.4 [4.9] (858) [4.9] (858) N/A <100 <150**** <150 84.8 46.4 [5.3] (928) [2.9] (508) Salt fog corrosion/ SR (milliohms)* 168 hrs. TR (milliohms)* Peel, OZ./inch [ppi] (N/m)** CHO-TP-57*** CHO-TP-57*** ASTM D1000 N/A N/A N/A N/A N/A N/A N/A N/A N/A <2 N/A <2 <275**** 76.8 62.4 [4.8] (840) [3.9] (683) N/A <100 <600**** <1000 80 33.6 [5.0] (875) [2.1] (368) Taber abrasion 500 gramweight, CS-10 wheel, 500 cycles CHO-TP-57*** <3 <5 <2 SR (milliohms)* CCH CCE CCJ CCK CCD CAD CFT <2 <2 <2 <2 N/A N/A <100 <3 <35 <2 <15**** <100**** <100 48 [3.0] (525) 70.4 [4.4] (710) 44.8 [2.8] (490) N/A N/A <100 44.8 51.2 46.4 [2.8] (490) [3.2] (560) [2.9] (508) <3 <6 <9 <6 N/A N/A <175 N/A = Not Applicable * All measurements of surface resistivity and through resistivity made at ambient temperature with tapes mounted on tinned copper substrate except for taber abrasion where a plastic substrate was used. ** 90 peel strength tests were done on an Instron at 2 inches per minute with tapes on a 2024 aluminum substrate. *** CHO-TP-57 available from Chomerics on request. **** Through resistivity measurement of double sided adhesive tapes done with tapes flanged between 2024 aluminum substrates. Chomerics Div. of Parker Hannifin Corp. 77 Dragon Court Woburn, MA 01888-4014 Tel: 781-935-4850 FAX: 781-933-4318 www.chomerics.com Parker Hannifin PLC Chomerics Division Parkway, Globe Park Marlow, Bucks., SL7 1YB, England Tel: (44) 1628 486030 FAX: (44) 1628 890053 France Freephone Tel: (0590) 8170 Germany Freephone Tel: (0130) 818074 NOTICE: The information contained herein is to the best of our knowledge true and accurate. However, since the varied conditions of potential use are beyond our control, all recommendations or suggestions are presented without guarantee or responsibility on our part and users should make their own tests to determine the suitability of our products in any specific situation. This product is sold without warranty either expressed or implied, of fitness for a particular purpose or otherwise, except that this product shall be of standard quality, and except to the extent otherwise stated on Chomerics' invoice, quotation, or order acknowledgement. We disclaim any and all liability incurred in connection with the use of information contained herein, or otherwise. All risks of such are assumed by the user. Furthermore, nothing contained herein shall be construed as a recommendation to use any process or to manufacture or to use any product in conflict with existing or future patents covering any product or material or its use. The items described in this document are hereby offered for sale by Parker Hannifin Corporation, its subsidiaries or its authorized distributors. This offer and its acceptance are governed by the provisions in the document entitled "Offer of Sale," available from Chomerics on request. (c) Chomerics, div. of Parker Hannifin Corp., 1999 Printed in U.S.A. 3M1197SG-214 Rev. 1-1197