Manufacturer: Elementis Specialties Inc.

Ingredient Type: Additive

Function: Rehology Modifier Agent


BENTONE 34 is an organic derivative of a bentonite clay. This rheological additive is designed for low to intermediate polarity organic systems.


These are typical properties not to be used for specification purposes.


  • Adhesives
  • Anti-corrosive paints
  • Automotive finishes
  • Bituminous compositions
  • Buffing compounds
  • Coil coating systems
  • Dip coatings
  • Finishes for household appliances
  • Greases
  • High-build systems
  • Industrial finishes
  • Interior and exterior house paints including do-it-yourself paints
  • Knifing fillers
  • Mould release agents
  • Paint stripper pastes
  • Plastisols
  • Primers, undercoats, fillers
  • Printing inks
  • Putty and caulking compounds
  • Refinishes for household appliances
  • Road marking paints
  • Underbody sealants and sound-absorbing compounds
  • Wood preservatives and finishing systems
  • Waxes
  • Wood preservatives and finishing systems


  • Increases viscosity
  • Provides thixotropy
  • Prevents pigment settling during storage
  • Improves flow and leveling
  • Controls sagging on vertical surfaces and It Penetration on porous substrates
  • Prevents syneresis in thixotropic systems


Incorporation of BENTONE 34 in organic systems (e.g., paints) requires high-shear dispersion equipment and a chemical activator.
Two basic incorporation methods can be used:

  1. Addition of BENTONE 34 as a dry powder for in-situ dispersion and activation
    The BENTONE 34 powder is added directly to the resin/solvent blend and is thoroughly mixed for 10 minutes. A chemical activator (see below) should be added next and mixed for 10 minutes. The pigments and fillers are then added and dispersed with high shear for at least 15 minutes.
  2. Addition of BENTONE 34 as Pregel of 5%–10% by weight
    The solvent is charged to the mixing tank. BENTONE 34 powder is added and dispersed under high shear. A chemical activator can then be introduced to optimize gelation (see below). For incorporation in the full formulation the Pregel is added to the resin/solvent mixture with stirring. Pigments and fillers are then incorporated and dispersed under high shear.
    For more details see the Elementis Rheology Handbook.

Suitable Dispersion Equipment
High-speed disc impellers (Cowles dissolver); Ultra-Turrax, pearl-, sand-, ball- and three-roll mills.

Chemical Activators
Recommended to ensure full activation, i.e., optimum efficiency of BENTONE 34.


The level depends on the system in which BENTONE 34 is to be used. For house paints and industrial paints typical levels are between 0.2 and 0.5 % (dry).
BENTONE 34 based on total system weight. For primers slightly higher quantities are required (0.5 – 1 % dry BENTONE 34).
In aqueous systems between 0.2 and 0.3 % BENTONE 34 (dry) are used


  • CLAYTONE® 40 (BYK – Germany)
  • TIXOGEL® VP (BYK – Germany)
  • Perchem® 44 (Laporte – Italy)
  • VISCOGEL™ B4 (Laviosa Chimica Mineraria SpA (BENTEC S.p.A.) – Italy)
  • VISCOGEL™ S4 (Laviosa Chimica Mineraria SpA (BENTEC S.p.A.) – Italy)
  • PANGEL® OM4 (Tolsa – Spain)

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