Schlegel Electronic Materials (SEM) introduces DynaShear and DynaGreenTM  an innovative EMI shielding gasket family for the shielding of modules in card/cages environment that is able to offer superior features over metal fingerstocks and current Fabric-Over-Foam gaskets . DynaShear and DynaGreenTM  utilize the bump technology  that result  from a three axis development program :   

– SEM famous special flat D-Profiles with bump.

– Low memory ultra soft foam type 7.

– Abrasion resistant conductive fabrics.

Both programs DynaShear and DynaGreenTM are supplied with a flammability UL94-V0 rating but DynaGreenTM utilizes a special SEM ‘s formulation for  the retardants making that series Halogen Free according to IEC 61249-2-21    ( 900 ppm max. bromine  , 900 ppm max chlorine max. with a total of max. 1500 ppm ).

Height
Width
1.5mm2.0mm2.3mm2.7mm3.0mm3.3mm3.5mm3.8mm
6mmEY37n2Z
xxxxÿ(HF)
EK97n2Z
xxxx(HF)
EQ67n2Z
xxxx(HF)
EQ77n2Z
xxxx(HF)
E2S7n2Z
xxxx(HF)
EQ87n2Z
xxxx(HF)
E2W7n2Z
xxxx(HF)
EQ97n2Z
xxxx(HF)
8mmEY47n2Z
xxxx(HF)
EV37n2Z
xxxx(HF)
EP17n2Z
xxxx(HF)
EU87n2Z
xxxx(HF)
E2T7n2Z
xxxx(HF)
EV67n2Z
xxxx(HF)
E2X7n2Z
xxxx(HF)
EV77n2Z
xxxx(HF)
10mmEY57n2Z
xxxx(HF)
EJ87n2Z
xxxx(HF)
EJ97n2Z
xxxx(HF)
EK17n2Z
xxxx(HF)
E2P7n2Z
xxxx(HF)
EK27n2Z
xxxx(HF)
E2R7n2Z
xxxx(HF)
EK37n2Z
xxxx(HF)
12.7mmEY27n2Z
xxxx(HF)
EK47n2Z
xxxx(HF)
EK57n2Z
xxxx(HF)
EK67n2Z
xxxx(HF)
E2U7n2Z
xxxx(HF)
EK77n2Z
xxxx(HF)
E2Y7n2Z
xxxx(HF)
EK87n2Z
xxxx(HF)
17mmEY67n2Z
xxxx(HF)
EY77n2Z
xxxx(HF)
EV87n2Z
xxxx(HF)
EY87n2Z
xxxx(HF)
E2V7n2Z
xxxx(HF)
EY97n2Z
xxxx(HF)
E3B7n2Z
xxxx(HF)
E1A7n2Z
xxxx(HF)

n : specifies the fabric type (3: NiCu-C70 and 4 :NiCu-C12);      xxxx : specifies the length in the form of xx.xx”;

HF : DYNAGREEN TM ;

Standard parts supplied with wide release liner and 2 strips of adhesive.

Height given for untapped and uncompressed parts.

DynaShear / DynaGreenTM : Technical Features

Compression force : 0.70 lbs.-inch at 40 % compression (*)

Contact resistance  : 0.012 Ohms-inch at 40 % compression (*)

Compression set     : 15.4 % when compressed 50 % for 22 hrs. at 70°C (*)

Recommended compression for max. shielding : See  table in the “gasket selection “section .

Abrasion resistance : No change in surface resistivity 800,000 cycles (NiCu-C70)

General Service Temperature: -40°C (-40°F) , 70°C (158°F)

Flammability: UL94-V0 certified (under the component program of Underwriters Laboratories Inc. in specified claddings and  thicknesses)

Shielding Effectiveness: 96 dB (average) 20 MHz-10 GHz  – Mil DTL 83528 C  (NiCu-C70)

3M Adhesive 90° peel strength on stainless steel : 128/142 Oz./in after 72 hours –ASTM D3330

(*) : measured on  EJ9732ZXXXX

 DynaShear / DynaGreenTM : Gasket selection

These series of D-shape gaskets are characterized by the presence of a  bump  at the bottom surface so  to preserve a  substantial shielding effectiveness even when compression is low. RF measurement shows that below  20 % and down to almost 0% compression, Shielding Effectiveness is about  the value measured at 20 % compression .The thickness  of the bump  is typically 0.3 mm . The specific adhesive used  on this series has been selected for its high shear strength and has a nominal thickness of 0.17 mm .

The dimensions provided in this catalog are the dimensions for the parts un-taped and  in an uncompressed state . When the part is taped, the bump is slightly compressed. Therefore, the following values and table are provided to help the selection of the right profile versus the nominal gap between modules. The compression values for the gasket  (% from free height) are given in black and  the corresponding values of the gap between modules are provided in blue (in mm) .

Minimum Compression (mC):

mC = 1 %

Maximum Gap (MG) :

MG (mm) = 0.99 *h  with  h (mm) =[ ( H – 0.3 ) + 0.17 ] .

Nominal Compression (NC) : SEM recommend to compress 50 % of the free height h    

NC (%) =50

Nominal Gap (NG) :

NG (mm) = h * 0.5

Max. Compression  (MC):

MC (%) = (h-S)/h* 100  with S(mm)= s + 0.17

Minimum Gap (mG) :

mG =  S

P/NH(mm)W(mm)s(mm)h(mm)mC(%)MG(mm)NC(%)NG(mm)MC(%)mG(mm)
EY31.560.361.3711.36500.6961.310.53
EY41.580.391.3711.36500.6959.120.56
EY51.5100.391.3711.36500.6959.120.56
EY21.512.70.41.3711.36500.6958.390.57
EY61.5170.411.3711.36500.6957.660.58
EK9260.351.8711.85500.9472.190.52
EV3280.421.8711.85500.9468.450.59
EJ82100.481.8711.85500.9462.540.65
EK4212.70.391.8711.85500.9470.050.56
EY72170.541.8711.85500.9462.030.71
EQ62.360.362.1712.15501.0975.580.53
EP12.380.392.1712.15501.0974.190.56
EJ92.3100.392.1712.15501.0974.190.56
EK52.312.70.62.1712.15501.0964.520.77
EV82.3170.752.1712.15501.0957.60.92
EQ72.760.362.5712.54501.2979.380.53
EU82.780.372.5712.54501.2978.990.54
EK12.7100.392.5712.54501.2978.210.56
EK62.712.70.572.5712.54501.2971.210.74
EY82.7170.82.5712.54501.2962.260.97
E2S360.342.8712.84501.4482.230.51
E2T380.372.8712.84501.4481.180.54
E2P3100.542.8712.84501.4475.260.71
E2U312.70.582.8712.84501.4473.870.75
E2V3170.792.8712.84501.4466.550.96
EQ83.360.343.1713.14501.5983.910.51
EV63.380.373.1713.14501.5982.970.54
EK23.3100.573.1713.14501.5976.660.74
EK73.312.70.573.1713.14501.5976.660.74
EY93.3170.83.1713.14501.5969.40.97
E2W3.560.323.3713.34501.6985.460.49
E2X3.580.353.3713.34501.6984.570.52
E2R3.5100.393.3713.34501.6983.380.56
E2Y3.512.70.293.3713.34501.6986.350.46
E3B3.5170.793.3713.34501.6971.510.96
EQ93.860.333.6713.63501.8486.380.5
EV73.880.393.6713.63501.8484.740.56
EK33.8100.353.6713.63501.8485.830.52
EK83.812.70.573.6713.63501.8479.840.74
E1A3.8170.783.6713.63501.8474.110.95

Using the table

1. Pick in the table the nominal gap NG(mm) the closest to the actual one in your application

2. Select the width W (mm) in order to fill the gap as much as possible

3. Verify that mG and MG values are within the tolerances of the nominal gap NG