Precipitated and surface-treated synthetic amorphous silicas for rubber reinforcement, polymer thickening, and anti-settling u2014 hydrophilic and hydrophobic grades for filled and liquid systems.
Treated and precipitated silicas are fine synthetic amorphous silicas used innpolymers to reinforce, thicken, and control settling. Precipitated silica is thenworkhorse reinforcing filler for rubber; surface-treated (hydrophobic) fumed silica is thenrheology and anti-settling additive for filled and liquid systems. The dividing line isnsurface chemistry: a hydrophilic surface bonds water and polar groups, while ansilane-treated hydrophobic surface disperses into non-polar resins and rubber. Match thensurface to the polymer, not just the particle.
nnPrecipitated silica (CAS 112926-00-8) is the reinforcing filler behind silica-tirentechnology and a wide range of technical rubber goods. It raises tensile strength, tearnresistance, and abrasion resistance, and in tire treads it lowers rolling resistance versusncarbon black. The honest trade-off: its hydrophilic surface resists dispersion in non-polarnrubber and pushes compound viscosity up, so it is almost always run with a sulfur-functionalncoupling silane such as TESPT. Specify it where wet grip and rolling resistance matter.
nnSurface-treated fumed silica (CAS 68909-20-6) carries the same reinforcing structure withna silane-modified, water-repelling surface. That treatment lets it disperse into resins,nadhesives, and liquid silicones without absorbing atmospheric moisture, where it buildsnthixotropic viscosity and stops fillers and pigments from settling. Treated grades cost morenthan untreated silica and interact less with polar binders. Reserve them for non-polar ornmoisture-sensitive systems; for aqueous or polar formulations, an untreated hydrophilic gradenis usually the better and cheaper choice.
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