High-Viscosity Mixing Equipment Selection: From High-Speed Dispersers to Planetary Mixers
10/4/2026
The first step in mixer selection is to define viscosity and rheology. Low-viscosity (<3000 cps) liquids suit ordinary high-speed dispersers; as viscosity rises, ordinary discs "slip" and need scraping blades or twin-shaft structures.
Low Viscosity: High-Speed Dispersers Suffice
In the 3000-20000 cps range, concentric twin-shaft mixers (TSJ) are proven: low-speed blades with Teflon scrapers sweep the wall and push material inward while high-speed toothed impellers disperse; independent shafts balance mixing and dispersion.
Mid-High Viscosity: Concentric Twin-Shaft Mixers Excel
For pastes of 10,000-2,000,000 cps (silicone, PU sealants), the QLF powerful disperser or XJB planetary mixer is recommended: planetary blade paths cover the full kettle, and vacuum (-0.098 MPa) achieves defoaming and homogenization.
High-Viscosity Pastes: Powerful Dispersers and Planetary Mixers
Supporting equipment affects overall efficiency: discharge of high-viscosity materials is best handled by hydraulic discharge machines for metered filling; heating/cooling needs require confirming jacket structures at selection. Share viscosity, solids content and process parameters with the supplier for a tailored proposal.
Q&A from this article
Frequently asked questions and answers from this article
Viscosity spans orders of magnitude, and different ranges suit different agitator structures. This article maps dispersers, concentric twin-shaft mixers, powerful dispersers and planetary mixers by viscosity range.
Related Products
FL Series High-Speed Disperser
Stirs, dissolves and disperses liquids and powders, working alone or matched with sand mills. Variable-frequency drive with hydraulic lift, widely used in paints, inks, coatings, dyestuffs and papermaking.
FS Series Multifunctional Dispersing Kettle
Integrates low-speed heavy-duty stirring with high-speed dispersion for medium/high-viscosity and thixotropic materials. Stirring and dispersion proceed simultaneously for ideal results in mixing, dissolving, dispersing and tinting.
QLF Series Powerful Triple-Shaft Disperser
Two high-speed dispersers plus wall/bottom scraping create complex material flow for rapid dispersion and grinding. Handles high-viscosity pastes of 10,000-2,000,000 cps - widely used for silicone sealants, PU sealants, liquid silicone and electronic adhesives.
XJB Series Planetary Mixer
Planetary blades rotate and revolve simultaneously, creating complex material flow with no dead corners and easy discharge. Handles ultra-high-viscosity pastes of 10,000-8,000,000 cps for silicone, PU sealants, liquid silicone and electronic adhesives.
FL Series Vacuum Disperser
Designed for bubble-rich materials and volatile solvents. Vacuum dispersion reduces bubbles and solvent evaporation, accelerates fineness and rapidly defoams. Simple structure, high vacuum, easy operation.
GJD Series Emulsifying Disperser
For emulsification, mixing and dispersion in coatings, inks, pesticides and papermaking. Powerful high-speed shear achieves required fineness and uniformity in a short time.