Silver-containing conductive preparations of DODUCO GmbH
Manufacturer and supplier of silver-containing (silver-pigmented) conductive preparations (glues, varnishes, pastes)
Decades of experience in the area of production of silver-pigmented conductive preparations and close cooperation with the customer have enabled DODUCO to develop general and special problem solutions according to the customer's wish. This way, different conductive products resulted, the properties of which have been adjusted to different requirements.
DODUCO's range of precious-metal-containing (silver-pigmented) conductive preparations includes:
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Deviating delivery forms and packagings are possible on request.
Silver conductive varnishes
DODUCO's silver-pigmented conductive varnishes are liquid, solvent-containing, physically drying varnishes. Depending on the area of application (carrier material, drying requirements), there are mostly two types distinguished:
- Conductive varnishes on acrylate-resin basis and
- Conductive varnishes on nitrocellulose basis
At a silver share of approx. 40 % silver (exceptions are possible) in the form of silver powder or silver flakes from own production, DODUCO's silver conductive varnishes are characterised by high electrical conductivities at low viscosities. The liquid conductive varnishes can be applied to the carrier materials by brush, roller or submersion. If a spray application is desired, the conductive varnish should be mixed with the corresponding diluent (information on the diluent is available on request). Drying takes place by evaporation of the solvents contained in the temperature range between 20-100°C (on demand, higher temperatures are possible as well).
DODUCO's product range currently contains the following conductive varnishes:
AUROMAL® 35 | |
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Base | Acrylate resin |
silver-content | 70 % |
Viscosity | 100-200 mPas |
Surface resistance | < 100 mOhm/cm² at 150°C |
Properties/use | Hard, well-conductive silver layer, suitable for galvanic reinforcement |
AUROMAL® 38 | |
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Base | Acrylate resin |
silver-content | 40 % |
Viscosity | 40-50 mPas |
Surface resistance | 400 mOhm/cm² at RT < 100 mOhm/cm² at 100°C |
Properties/use | hard, well-conductive silver layer |
AUROMAL® 50 | |
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Base | Nitrocellulose |
silver-content | 45 % |
Viscosity | 30-50 mPas |
Surface resistance |
< 200 mOhm/cm² at RT < 50 mOhm/cm² at 100°C |
Properties/use | Level surface, particularly suitable for galvanic reinforcement |
AUROMAL® 50L | |
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Base | Nitrocellulose |
silver-content | 45 % |
Viscosity | 50-70 mPas |
Surface resistance |
< 200 mOhm/cm² at RT < 50 mOhm/cm² at 100°C |
Properties/use | Hard, well-conductive silver layer, suitable for galvanic reinforcement |
The benefit of the silver conductive varnishes as compared to the pastes is in simple processing and quick drying. Furthermore, they have a strong, good adhesion to the base and very good electrical and thermal conductivity.
DODUCO's silver-pigmented conductive varnishes are used in:
- shielding of electromagnetic waves in the area of electrical engineering and electronics
- Production of a contact in the area of electrical engineering and/or hobby electronics (e.g. electronic toys)
- Repair of conductor tracks / improvement of printed circuits
- Repair of heating conductors (rear window heatings)
- Repair of antennas
- Metallisation of non-conductive bases for galvanic further processing
Silver conductive pastes
The also physically drying silver-pigmented conductive pastes of DODUCO's range have a much higher viscosity than the conductive varnishes. This is caused by higher shares of silver (approx. 60%) and use of polymer basic components for formation of polymer compounds / design of the polymer structure. The silver used in the silver conductive pastes in the form of silver powder or silver flakes is also from the DODUCO-internal production.
The silver-pigmented polymer thick-film pastes are characterised by good electrical and thermal conductivity as well as good adhesion and bending resistance while being highly flexible. The application of conductive pastes preferably takes place by screen printing, with selection of the mesh size varying depending on printing pattern, layer thickness and base. Drying and curing may take place in circulation air dryers, IR-dryers or special tunnel furnaces.
On remand, the silver-pigmented conductive pastes can also be adjusted to different processing techniques (e.g. pad printing). The chemicals required for this may be purchased from DODUCO on request.
DODUCO's product range currently contains the following conductive pastes:
AUROMAL® 141 | |
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Base | Acrylate resin |
silver-content | 63 % |
Viscosity | 1,5-3,0 Pas |
Surface resistance | < 50 mOhm/cm² at 150°C |
Properties/use |
Mechanically high-strength coatings with very good conductivity, Good adhesion on plastic |
AUROMAL® 145 | |
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Base | Acrylate resin |
silver-content | 65 % |
Viscosity | 10-15 Pas |
Surface resistance | < 30 mOhm/cm² at 150°C |
Properties/use |
thixotropic, very good conductivity, Good adhesion on plastic
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AUROMAL® 170 | |
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Base | Mixed polymer |
silver-content | 60 % |
Viscosity | 3,5-5,0 Pas |
Surface resistance | < 50 mOhm/cm² at 150°C |
Properties/use |
Well-conductive, flexible layers with high abrasion resistance, Good adhesion on films |
The benefit of silver conductive pastes as compared to the varnishes is in the better adhesion to plastic bases as well as films. I spite of high demands by increased flexibility, the layers remain stable and retain their very good conductivity.
DODUCO's silver-pigmented conductive pastes are used in:
- production of conductor tracks on membrane keyboards
- production of circuits on PCBs
Silver conductive glue
In addition to silver conductive varnishes and silver conductive pastes, DODUCO also produces silver conductive glues. Silver-pigmented conductive glues are used to apply construction elements to different carrier materials with conductive contacts. The adhesive technique offers essential benefits as compared to soldering, since lower curing temperatures permit connecting even heat-sensitive parts to each other conductively. Additionally, the higher flexibility of the bonding improves ageing behaviour of the material/part.
DODUCO's delivery range contains two types of silver-pigmented conductive glues:
- Single-component conductive glue
- Two-component conductive glue
Single-component conductive glues are ready-to-use systems with long processing times. Curing takes place within 15-60 min. at temperatures between 120-200°C. In two-component conductive glues, in contrast, are mixed directly before use and then must be processed speedily. The processing time is approx. 4 hours, depending on ambience conditions. Curing can be thermally sped up.
Silver-pigmented conductive glues are applied by screen printing or dispenser.
DODUCO's product range currently contains the following conductive glues:
AUROMAL® K10 | |
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Base | Epoxy resin |
silver content | 70 % |
Viscosity | 15-25 Pas |
Surface resistance | < 100 mOhm/cm² bei 200°C |
Properties/use |
thixotropic, solvent-free, High-strength bonding for transferring high current and heat volumes to ceramics or metal
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AUROMAL® K11 | |
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Base | Epoxy resin |
silver content | 70 % |
Viscosity | 20-30 Pas |
Surface resistance | < 100 mOhm/cm² at 80°C |
Properties/use |
thixotropic, solvent-free, fixed, flexible, well-conductive connections for transferring high current and heat volumes to PCBs, ceramics or metal |
AUROMAL® K20 | |
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Base | Epoxy resin |
silver content | 70 % |
Viscosity | 10-20 Pas |
Surface resistance | < 50 mOhm/cm² at 200°C |
Properties/use |
thixotropic, solvent-free, firm, well-conductive connections for use on printed circuits of ceramics, metal or plastics |
AUROMAL® K5-A80 | |
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Base | Epoxy resin |
silver content | 80 % |
Viscosity | 20-30 Pas |
Surface resistance | < 100 mOhm/cm² at 80°C |
Properties/use |
solvent-free, well-conductive connections, suitable for plastics, mechanically very strong connections as an alternative for soft-soldering |
Special features of DODUCO's silver-pigmented silver glues are:
:
- very good conductivity
- low-stress properties
- high strength
- good heat conductivity
- no solvents
- temperature stability
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Contact person
Fabian Gall
Sales precious metal preparations
+49 7231 602 586Sascha Haug
Technical customer consulting
+49 7231 602 538 -
Product pages
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Silver ingots by DODUCO
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Certification
DODUCO Contacts and Refining GmbH is an accredited Silver LBMA Good Delivery List Refiner. This logo is a trade mark of The London Bullion Market Association.
The gold recovered by DODUCO Contacts and Refining GmbH and used in new products is certified as conflict free by the Responsible Minerals Initiative (RMI).
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Wiki of electrical contacts