Silica and Functional Fillers
Silica Grades and Production Routes
Synthetic amorphous silica can be made by wet or thermal processes. The route influences pore structure, aggregation and the form supplied.
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ENVO CHEMICAL GROUP / PRODUCTS
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Silica and Functional Fillers
Fumed Silica
Fumed silica can control rheology, reinforce compounds and limit settling. Distinguish hydrophilic from surface-treated grades.
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Vat Dyes
Indigo Blue
Indigo for vat dyeing may be supplied as powder, granules or a pre-reduced liquid. Each form requires its own comparison method.
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Mineral filler for coatings
Calcium Carbonate
Specify ground or precipitated calcium carbonate and the required surface treatment.
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Mineral filler for coatings
Talc powder
Talc is a platy mineral filler. Its orientation during processing can affect stiffness and dimensional stability.
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Pigments
Titanium Dioxide (TiO₂)
Choose titanium dioxide by crystal form and surface treatment. Distinguish rutile and anatase grades and the sulfate and chloride manufacturing routes.
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Pigments
Iron Oxide Pigments
Iron oxide pigments are available in different colors and grades. Match the shade in the actual binder.
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Pigments and Reinforcing Fillers
Carbon Black
Carbon black can serve as a pigment or reinforcing filler. Aggregate structure and dispersion conditions matter in both applications.
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Thermally Conductive Fillers
Spherical alumina
Spherical alumina is used in highly filled thermally conductive composites. Particle size distribution affects packing and flow.
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Thermally Conductive Fillers
Hexagonal boron nitride
Hexagonal boron nitride is a platy thermally conductive filler. Platelet orientation can produce different in-plane and through-plane properties.
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Effect Pigments
Pearlescent pigments
Pearlescent pigments use coated platelet substrates to produce angle-dependent optical effects.
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Flame-Retardant Fillers
Aluminum hydroxide, flame-retardant filler grade
For ATH in flame-retardant composites, match the particle size and decomposition range to the processing window.
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Fillers, reinforcement and coupling
Kaolin
Distinguish water-washed, calcined and surface-treated kaolin. Particle size and treatment are often more informative than whiteness alone when selecting a filler.
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Hiding power, color and fillers
Barium sulfate
Compare particle size, coarse fraction and whiteness for ground barite and precipitated barium sulfate separately. Thin films are especially sensitive to coarse particles.
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Dispersion, rheology and matting
Ammonium polyacrylate dispersants
For aqueous pigment grinds, compare viscosity on an equal active dispersant basis. Check for viscosity rebound after latex addition.
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Dispersion, rheology and matting
Organophilic bentonite clays
Organophilic bentonite must match the polarity of the continuous phase and the dispersion process. Activation requirements can differ by grade.
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Dyeing, exhaustion and reduction
Reactive dyes
Select reactive dyes by shade, reactive system and process. Products with the same color name can differ in strength and fixation.
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Dyeing, exhaustion and reduction
Disperse dyes
For polyester disperse dyes, specify shade, energy class and subsequent heat setting. Dispersion affects specks and filterability.
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Dyeing, exhaustion and reduction
Acid dyes
Wool and nylon differ in dye uptake and leveling. State fiber, shade and fastness requirements at the start of an acid dye inquiry.
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