the GS8000 series of gore ? emi shielding materials improves package design fexibility without compromising the electrical performance of the device. these highly compressible materials are specifcally engineered to maintain consistent conductivity through a wide working range (see figure 1 and figure 2). with gores strong technology focus in materials, the GS8000 series was developed with a unique conductive foam. the soft conductive- foam construction accommodates surface variations in covers and printed circuit boards, alleviating the need to specify very tight tolerances. this soft construction also makes the GS8000 series compatible with plastic housings and snap fasteners. this material maintains excellent shielding performance in a trace width as narrow as 1 mm, providing comparable performance to other emi shielding materials that are 3 times the width. with the lower compression or closure force, fewer fasteners are needed. typical applications ? p ortable electronic devices, mobile phones, and gps ? p ortable computers ? hand-hel d feld testing equipment available as grounding pads and precision die-cut parts that enable precise, high-volume assembly, the GS8000 series of gore ? emi shielding materials provide maximum cavity-to-cavity emi protection in a smaller size for more design fexibility. increase package design fexibility while maintaining electrical integrity table 1: environmental and mechanical properties available as custom die-cut gaskets, strip gaskets, and grounding pads benefts of gore ? emi shielding materials GS8000 series ? un surpassed shielding effectiveness and minimal dc resistance with low compressive force and broad range of tolerance take-up ? r eliable electrical performance over wide range of gap distances from soft foam construction ? eff ective shielding performance in trace widths as narrow as 1 mm ? impr oved design fexibility because of low closure force gore ? emi shielding materials GS8000 series gaskets and grounding pads property v alue temperature range - 45c to 85c rohs status (lead, cadmium, hexavalent chromium, mercury, bromine) pass fl ammability in accordance with ul 94 horizontal burn method pass halog en levels (measured per bs en 14582:2007) chlorine < 50 p pm bromine < 50 p pm fluorine < 50 p pm iodine < 50 p pm typical working range (for grounding pads) 0.15 mm t o 2.2 mm ( 0.006" t o 0.087") typical working range (for emi gaskets) 0.15 mm t o 1.4 mm ( 0.006" t o 0.055") typical pressure to recommended compression stop (rcs) 20 t o 50 psi page 1
extended service heights the GS8000 series of gore ? emi shielding materials performs well in both grounding and emi shielding applications. gore recommends using each variant within a range of service heights (gap distances). for shielding applications, gore recommends a smaller service height range than for grounding applications to ensure a robust emi seal. the low closure force and broad range of tolerance take-up results in multiple product choices for some gap distances. selecting the most suitable variant for a given application depends on: 1. g ap distance of the housing that needs to be flled 2. c ompression force required to achieve the specifed gap distance 3. r equired dc resistance for grounding applications (or required shielding effectiveness for shielding applications) at a specifed gap distance figure 1 and figure 2 show recommended service heights (gap distances) for each variant. figure 1: recommended service heights for use in emi gasket applications 1 t o measure the recovered thickness, samples were compressed to the compression stop. while compressed, the samples were subjected to a 70c temperature soak for 70 hrs per astm d395b. lastly, the samples were released from compression and allowed to recover for 30 minutes before the recovered thickness was measured. pressure and dc resistance three of the variants among the GS8000 series provide conductivity when compressed to 0.6 mm (0.24 in); however, the amount of pressure and dc resistance varies for each. table 2 shows the values for each of these three variants. table 2: pressure and dc resistance values at 0.6 mm gap (data taken from figures 3 C 6) v ariants pr essure required (psi) dc resistance (ohms) GS8000-063 15 0.03 GS8000-095 55 0.02 GS8000-126 75 0.01 table 3: product specifcations (measured on 5 x 5 mm grounding pads) figure 2: recommended service heights for use in grounding pads 2.40 2.25 2.10 1.95 1.80 1.65 1.50 1.35 1.20 1.05 0.90 0.75 0.60 0.45 0.30 0.15 0.00 GS8000 series GS8000-03x GS8000-063 GS8000-095 GS8000-126 gap distance (mm) 2.20 mm @ 1 psi 1.40 mm @ 5 psi 0.60 mm @ 75 psi 1.20 mm @ 5 psi 0.85 mm @ 20 psi 0.50 mm @ 100 psi 0.90 mm @ 5 psi 0.60 mm @ 15 psi 0.30 mm @ 95 psi 0.45 mm @ 10 psi 0.30 mm @ 50 psi 0.15 mm @ 325 psi 1.50 1.35 1.20 1.05 0.90 0.75 0.60 0.45 0.30 0.15 0.00 GS8000 series GS8000-03x GS8000-063 GS8000-095 GS8000-126 gap distance (mm) 1.40 mm @ 5 psi 0.60 mm @ 75 psi 0.85 mm @ 20 psi 0.50 mm @ 100 psi 0.60 mm @ 15 psi 0.30 mm @ 95 psi 0.30 mm @ 50 psi 0.15 mm @ 325 psi GS8000 series gaskets and grounding pads gre ie eris page 2 pr essure to achieve initi al dc r ecovered v ariants w eight c ompression re sistance thic kness (g) (psi) (ohms) mm (in) high 0.45 (0.018) 10 0.245 0.56 (0.022) GS8000-03x 0.008 r ecommended 0.30 (0.012) 50 0.125 0.38 (0.015) l ow 0.15 (0.006) 325 0.015 0.25 (0.010) high 0.90 (0.035) 5 0.070 1.19 (0.047) GS8000-063 0.010 r ecommended 0.60 (0.024) 15 0.025 0.91 (0.036) l ow 0.30 (0.012) 95 0.007 0.51 (0.020) high 1.20 (0.047) 5 0.115 1.65 (0.065) GS8000-095 0.011 r ecommended 0.85 (0.033) 20 0.040 1.24 (0.049) l ow 0.50 (0.020) 100 0.010 0.74 (0.029) high 2.20 (0.087) 1 0.240 2.62 (0.103) GS8000-126 0.013 r ecommended 1.40 (0.055) 5 0.150 1.90 (0.075) l ow 0.60 (0.024) 75 0.012 0.94 (0.037) c ompression stop mm (in)
variants recommended compression stop mm (in) pressure to achieve compression (psi) shielding effectiveness 1 GS8000-03x high 0.30 (0.012) 50 > 50 db low 0.15 (0.006) 325 > 65 db GS8000-063 high 0.60 (0.024) 15 > 90 db low 0.30 (0.012) 95 > 100 db GS8000-095 high 0.85 (0.033) 20 > 85 db low 0.50 (0.020) 100 > 95 db GS8000-126 high 1.40 (0.055) 5 > 75 db low 0.60 (0.024) 75 > 95 db mm 0.45 0.40 0.35 0.30 0.25 0.20 0.15 mm in 0.018 0.016 0.014 0.012 0.10 0.008 0.006 in 0.25 0.20 0.15 0.10 0.05 0.00 350 300 250 200 150 100 50 0 compressed gap pressure dc resistance dc resistance (ohms) pressure (psi) figure 3: GS8000-03x force displacement resistance (testing with 5 x 5 mm grounding pads) figure 4: GS8000-063 force displacement resistance (testing with 5 x 5 mm grounding pads) mm 0.9 0.8 0.7 0.6 0.5 0.4 0.3 mm in 0.035 0.031 0.028 0.024 0.020 0.016 0.012 in 0.25 0.20 0.15 0.10 0.05 0.00 350 300 250 200 150 100 50 0 compressed gap pressure dc resistance dc resistance (ohms) pressure (psi) for use as an emi gasketing material, we recommend compressing the GS8000 material to at least the published recommended compression stop to ensure an effective emi seal (see table 4). 1 a ll measurements made using arp-1705 modifed test method through 3 ghz on 2 mm trace width table 4: shielding effectiveness 1 page 3
notice use restrictions apply not for use in food, drug, cosmetic or medical device manufacturing, processing, or packaging operations. w. l. gore & associates. inc. gore and design are trademarks of w. l. gore & associates, inc. ?2012 w. l. gore & associates, inc. 11-21-12 ordering information the GS8000 series of gore ? emi shielding materials are available as custom die-cut gaskets, strip gaskets, and grounding pads. to order or specify GS8000 grounding pads and custom die-cut gaskets, contact gore for assistance. standard strip gaskets (as seen in table 5) are available through several distributors. go to gore.com/emidistribu - tors for the list. these strip gaskets are packaged on 15 meter rolls. for other available strip gasket confgura - tions, contact gore for assistance. figure 6: GS8000-126 force displacement resistance (testing with 5 x 5 mm grounding pads) 0.25 0.20 0.15 0.10 0.05 0.00 350 300 250 200 150 100 50 0 mm 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 mm in 0.087 0.079 0.071 0.063 0.055 0.047 0.039 0.031 0.024 in compressed gap pressure dc resistance dc resistance (ohms) pressure (psi) 0.25 0.20 0.15 0.10 0.05 0.00 350 300 250 200 150 100 50 0 mm 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 in 0.47 0.43 0.39 0.35 0.31 0.28 0.24 0.20 compressed gap pressure dc resistance dc resistance (ohms) pressure (psi) figure 5: GS8000-095 force displacement resistance (testing with 5 x 5 mm grounding pads) table 5: strip gasket ordering information p art number v ariants w idth edr -80-03x-0500-sc GS8000-03x 0.500" edr -80-03x-0250-sc GS8000-03x 0.250" edr -80-03x-0125-sc GS8000-03x 0.125" edr -80-063-0500-sc GS8000-063 0.500" edr -80-063-0250-sc GS8000-063 0.250" edr -80-063-0125-sc GS8000-063 0.125" edr -80-095-0500-sc GS8000-095 0.500" edr -80-095-0250-sc GS8000-095 0.250" edr -80-095-0125-sc GS8000-095 0.125" edr -80-126-0500-sc GS8000-126 0.500" edr -80-126-0250-sc GS8000-126 0.250" edr -80-126-0125-sc GS8000-126 0.125" gore ? emi shielding materials gore.com GS8000 series gaskets and grounding pads page 4
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