silcomix: LSR dosing system

Extremely precise and efficient dosing of LSR in injection moulding processes

The silcomix is a compact-designed, electrically driven piston pump metering and mixing system. It is used for continuous processing of medium to high-viscosity silicone-based media with a mixing ratio of 100:100. Metering is carried out directly from the original containers with a size of 20 or 200 l.

Features and benefits

  • High energy efficiency through servo-electrically driven piston pumps
  • Extremely low material waste through simultaneous drum drainage and use of special supply pumps (material residual quantity in drum < 1 %)
  • User-friendly system operation thanks to 7” touch panel
  • Precise adherence to mixing ratio through synchronous switching of piston pumps (SWIPSYNC)
  • Compact, space-saving system design
  • Compatible with pallet trucks and forklifts
  • Extremely good control behavior; even small shot sizes are possible in optimal quality
  • Flexible operation thanks to processing from 20 or 200l containers (on a chassis)
  • Process reliability thanks to data monitoring and archiving
  • Processing of abrasive media for pigment metering through special sealing technology

New mixing unit

DOPAG has developed a new mixing unit for the LSR pump silcomix. The new design is unique on the market and simplifies the operation, while ensuring shorter setup times and greater system availability.

Click here and learn more!

Technical specifications

Outflow rate up to 1.2 or 3.6 l/min (at max. 20 or 12 double strokes per minute and at MR 100:100, depending on viscosity)    
Mixing ratio 100:100 (further ratios available on request)    
Colour injection metering up to 4 colours with a ratio of 0.2 - 5% each    
Maximum working pressure 250 bar    
Material supply 20 or 200 l    
Viscosity up to 1,000,000 mPa s (higher viscosity available on request)    
Operating voltage 400/230 VAC 3/N/PE/50/60 Hz 480 VAC 3/PE 50/60 Hz 200 VAC 3/PE 50/60 Hz
Dimensions (D x W x H),
Lifter retracted
960 x 1,320 x 1,920 mm    


The servo-electrical drive enables synchronous switching of the piston metering pumps, regardless of the current position of the respective pump piston (switching point synchronization). This prevents deviations from the mixing ratio due to different switching points. The demand-based, automated adaptation of the volume flows of individual components by means of the lifting speed of the piston metering pumps ensures uniform drum drainage of the A and B components. The collapse in pressure flow, and thus also volume flow, is considerably reduced through a special control of the servo drives, with the time also significantly shortened.


  • Pneumatic driven rams
  • Follower plate for 200 l containers
  • Static base support
  • Servo-electrically driven piston pumps with ‘SWIPSYNC’
  • Material pressure monitoring via pressure sensors
  • DOPAG MR40 metering calculator
  • System operation via 7” colour touch panel
  • Analogue level monitoring
  • High-pressure material supply package
  • Injection pressure sensor
  • Real-time remaining time display
  • Interface for all well-known manufacturers of injection moulding systems


  • Drum roll-in unit
  • Drum roller conveyor
  • Active, pneumatic base support
  • Removable follower plates for 20 l containers
  • Material screens for follower plates
  • Automated drum and pump ventilation
  • Mixing ratio monitoring (volume measuring cells)
  • Pigment or additive metering – up to 4 pigments/additives available
  • Empty signal for 10 l pigment supply
  • Level detector and electrical agitator for pigment container
  • Pigment/additive quantity measurement (volume flow, quantity)
  • Additional mixing units
  • Mixer cooling
  • Metering pressure monitoring at mixer with digital display
  • Special operating voltage

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