BCE 30371 (Formerly C 371)


PROTAVIC® BCE 30371 is a heat curing pure silver-based single-component electro-conductive paint in solvent media, for gluing and coating of electronic components. It is well suited for the end termination of surface mount components. Its flexibility gives much more reliability than with silver glass frits it replaces. The PROTAVIC® BCE 30371
a ready to use product.


It is recommended to store the PROTAVIC® BCE 30371 in a sealed container. Its storage stability at a temperature below + 10°C is 9 months.  Its pot life or machine pot life is about 16 hours at 20 ± 5°C because of solvent evaporation. One can add PROTASOLVE® 434 to increase the shelf life of the product termination of surface mount components. Its
flexibility gives much more reliability than with silver glass frits it replaces. The PROTAVIC® BCE 30371 a ready to use product.


PROTAVIC® BCE 30371 possesses excellent protection properties against the environment, once it has been cross-linked due to its modified epoxy base.
After evaporation of its solvent phase, it possesses a fast curing speed for a single-component product, especially in a thin coating, giving a flexible, hard film, which possesses:

  • an excellent adhesion to tantalum, graphite
  • ceramic, quartz, aluminum, glass, metals
  • enamels, multi-layer materials and thermoset plastics
  • a very high electrical conductivity and a very low ESR potential on conductive metals used in electronics (silver, gold, palladium… etc)
  • an excellent heat resistance, around 150°C
  • a good adhesion of the electro-nickel plating onto the resin PROTAVIC® BCE 30371


A – Application process

Before use, PROTAVIC® BCE 30371 has to be made completely homogeneous by stirring in its original container (with a spatula for small quantities or by rolling the container for  some hours at a slow speed, 50 to 150 rpm).  PROTAVIC® BCE 30371 does not need a primary coat. It adheres by simple evaporation of the solvent system it contains. The surface to which it is applied has to be dry, free from oil, grease and dust.  The PROTAVIC® BCE 30371 is delivered as a ready to use product.

It has a rheology especially suitable for dipping the ends of components on automatic equipment such as Chipstar or Palomar.  If necessary, the viscosity of the PROTAVIC® BCE 30371 can be reduced by adding some diluant PROTASOLVE® 434 which can also be used for removing erroneous deposits of PROTAVIC® BCE 30371 before drying and polymerization, as well as for cleaning the application equipment.

B. Drying

PROTAVIC® BCE 30371 has to be dried in a ventilated drying chamber (regulated at approximately 65°C) for the elimination of the solvent system (a few minutes to a quarter of an hour depending on the thickness deposited). An infra red drying is also possible.
On automatic machines and for a 20 to 50 μm, the in line drying is possible within 3 to 5 minutes at 90 – 110°C.

C – Polymerization

PROTAVIC® BCE 30371 after evaporation of its solvent phase should be polymerized at 150°C minimum.  Very good adhesive and conductivity properties are obtained after a polymerization of one hour at 150°C.  When the polymerization temperature is not an
obstacle for the component or the fabrication process, a polymerization of 30 minutes at 180°C a curing of 30 minutes at 180°C gives optimum results.


Thanks to its good properties and its ease of use, PROTAVIC® BCE 30371 is best used in consumer and professional electronics market products requiring electrically conductive glues and coating, namely for:

  • the end termination of surface mounted ceramic
  • components (resistors, tantalum capacitors)
  • the attach of conductor wires on quartz crystal
  • production of electroconductive coatings
  • etc.


Storage at a temperature of less than 10°C is necessary for conserving all the original properties of PROTAVIC® BCE 30371.  Also, it is necessary to keep it in its original sealed
container, in order to avoid the loss of solvent by evaporation.  If necessary it is always possible to compensate for that loss by evaporation by adding PROTASOLVE® 434 exclusively.  During shipment temperature must not exceed 25°C by adding ice-packs in the parcels.


Refer to the enclosed safety data sheet.


PROTAVIC® BCE 30371 is supplied in 1000 g tins or in 750 g cartridges.