Manufactered by : CRC Industries Europe NV Touwslagerstraat 1 – 9240 Zele – Belgium Tel  (32) (0) 52/45.60.11  Fax  (32) (0) 52/45.00.34 Technical Data Sheet KONTAKT CHEMIE EMI 35 Page 1/3 High-conductivity screening coating KONTAKT CHEMIE EMI 35 Description: Electrically conductive acrylic resin coating with copper pigment General properties and applications: KONTAKT  CHEMIE  EMI  35  paint  contains  a  special  copper  pigment  which  creates  an electrically conducting network inside an acrylic resin base. This offers a simple method of applying high-conductivity coatings to non-conductive plastics. KONTAKT CHEMIE EMI 35 is used for the electromagnetic shielding of plastic housings of electronic  devices.  The  coating  is  supplied  in  aerosol  cans  and  in  bulk  (by  the  litre).  The aerosol can is a method of treating small runs or prototypes for electromagnetic compatibility testing.  For  serial  production  applications  the  coating  can  be  applied  using  standard  paint spray equipment. Technical data Paint as supplied Aerosol Density   FEA 605 0,9 g/cm³ Flash point ASTM D 56 < 0°C Solids content DIN 53216 25 % Coverage (for 50 µm layer thickness) calculated 0,32 m² /200 ml   aerosol Bulk Density   DIN 51757 (C) 1,65 g/cm³ Flash point ASTM D 53 10°C Solids content DIN 53216 63 % Coverage (for 50 µm layer thickness) Calculated 7,8 m² / l  

Manufactered by : CRC Industries Europe NV Touwslagerstraat 1 – 9240 Zele – Belgium Tel  (32) (0) 52/45.60.11  Fax  (32) (0) 52/45.00.34 KONTAKT CHEMIE EMI 35 Page 2/3 Technical data : continued from page 1 Properties of dry paint coating Colour copper brown Conductor system copper pigment Drying time at 20°C tack-free handable 5 min 30 min Continuous working temperature -40°C to +95°C Pencil hardness 8H to 9H Adhesion to Cyolac KJB ASTM-D 3359-1976 Excellent Surface resistivity, four- pole measurement on the long side of a 10 cm x 2 cm plastic strip Coating thickness 50 micron < 0,5 +/- 0.2 W Screening attenuation ASTM ES 7-83 60 dB Application instructions: Aerosol can For  relatively  small  applications  very  neat  results  can  be  obtained  at  low  cost  using  the aerosol  can.  The  requirement  is  that the can should be shaken well (about 1 minute); the mixing ball must be heard rattling while this is going on. Bulk For a bulk supply the product can be applied by spraying and also, to a limited extent, by the use of a brush.   Before being removed from the can, the contents must be mixed thoroughly because over time  the  heavy  metal  pigment  settles  on  the  bottom.  A  paint  shaker  can  be  used  for  the mixing. When an electric (explosion protection) or pneumatic propeller mixer is used, speed and propeller size must be such as to clearly agitate the viscous liquid.   Brush application is best carried out using a soft brush when 5 parts per volume EMI 35 are mixed with 2 parts per volume diluent for EMI 35.  Usually,  however,  the  resistivity values obtained are not so good as in the case of spraying because the distribution of the pigment is not so uniform.

Manufactered by : CRC Industries Europe NV Touwslagerstraat 1 – 9240 Zele – Belgium Tel  (32) (0) 52/45.60.11  Fax  (32) (0) 52/45.00.34 KONTAKT CHEMIE EMI 35 Page 3/3 For the spraying, nozzle apertures of 1 mm to 1.5 mm are used. An air pressure of from 2 to 3 bar has been found satisfactory. When treating large hollow spaces, the spray pressure is to be reduced as far as possible to prevent blowback of the product. A spraying distance of 10  cm  to  20  cm  is  favourable;  the  spray  breadths  must  have  a  50%  overlap.  For  smaller runs, spray guns can be used, but the bulk can needs to be shaken frequently. For serial production, spray systems with pressure tank and agitator are suitable. The most favourable dilution ratio is approx. 5 parts per volume EMI 35 to 4 parts per volume EMI 35 diluent. Routine monitoring of the viscosity can be performed with a Ford cup no.4. The above dilution ratio results in a run-out time of 16 s to 20 s. The dilution ratio and run-out time need, of course, to be optimised for the spray system in question. The normal safety measures of the handling of flammable solvents must be taken.  Other safety instructions are to be found in the safety datasheet. Dried-on  residues  can  be  readily  cleaned  from  tools  and  equipment  with  ketones  (e.g acetone, MEK or diluent for EMI 35). The coating can be allowed to dry on metal tools. It can then easily be removed by knocking or the use of a hard brush. Adhesion KONTAKT CHEMIE EMI 35 exhibits good adhesion to many plastics. Excellent experiences have  been  obtained  with  ABS,  ABS-PC-blends,  PVC, PPO-PS. Simple polystyrene cannot be  coated  with  EMI  35.  For  polyamide  a  priming  coat  is  needed;  suitable  products  are stocked in many paint shops. For all plastics it is necessary to check that the product is compatible with the original parts when  it  is  to  be  used  in  serial  production.  In  particular,  it  is  necessary  to check for stress cracks on parts subject to mechanical loading (for example, domes for self-tapping screws are  critical).  Whether  a  plastic  coated  with  EMI  35  is  fundamentally  susceptible  to  stress cracking can be determined by a bending strip test. If stress cracks occur, you can try to omit the areas at risk or use an inhibiting primer to prevent the solvent penetrating into the plastic. KONTAKT  CHEMIE  EMI  35  does  not  adhere  to  metals.  It  can  be  applied  directly  to  dry timbers.  Depending  on  the  quality  of  the  timber,  the  length  of  its  working  life  can  be increased by the use of a suitable primer. Available : Aerosol :200 ml Bulk :1l These values are not intended to be used as specifications.  They are based on what we believe reliable.  However it is the user’s responsibility to determine the suitability.