Silica Matting Agent
Vistamatt VS381C
Vistamatt VS381C is a synthetic amorphous silica matting agent produced by Longyan Vista Chemical Co., Ltd. for industrial & metal coatings. Vistamatt VS381C has a typical D50 of 8.0-8.3 µm, a BET specific surface area of 82 m²/g, an oil absorption of 125 g/100 g and an SiO2 content of 95.8 %. Particle size, pore structure and surface treatment are selected to reduce gloss while keeping transparency and dispersion behaviour in the target system.
Typical properties
| Property | Typical value | Method / note |
|---|---|---|
| Particle size D50 | 8.0-8.3 µm | Laser diffraction, ISO 13320 |
| Particle size D10 | 6.3 µm | Laser diffraction, ISO 13320 |
| Particle size D90 | 10.2 µm | Laser diffraction, ISO 13320 |
| SiO2 content | 95.8 % | Dry basis |
| Specific surface area | 82 m²/g | BET |
| Oil absorption | 125 g/100 g | DIN ISO 787-5 |
| pH (5 % suspension) | 6.1 | DIN ISO 787-9 |
| Loss on drying | 5.9 % | 2 h at 105 °C |
| Tamped bulk density | 0.42 g/cm³ | DIN ISO 787-11 |
| Whiteness | 92.8 | Ry value |
| Chemical basis | Synthetic amorphous silica, CAS 7631-86-9 | — |
| Appearance | White fine powder | Visual |
Typical values from standard production batches, not guaranteed specifications. Actual batch values may vary within tolerance; a certificate of analysis is supplied per batch on request, tested to HG/T 3061-2020.
Where Vistamatt VS381C fits
Vistamatt VS381C is positioned for industrial & metal coatings. Selecting a matting agent for this application starts from three inputs: the binder system, the target gloss at 60°, and the film build at which that gloss must hold.
Particle size sets the average height at which silica protrudes through the dried film, which sets baseline gloss. The D10 to D90 spread — 6.3 to 10.2 µm for Vistamatt VS381C — governs how uniform those protrusions are, and therefore how stable gloss stays between batches. Oil absorption at 125 g/100 g determines how much binder the silica immobilises, which shifts the effective binder-to-pigment ratio at constant loading.
A grade matched only on mean particle size will often pass a bench drawdown and then drift at pilot scale, where dispersion energy and film build differ from laboratory conditions. Screening at matched gloss rather than matched loading is the reliable way to compare.
Frequently asked questions
What is Vistamatt VS381C?
Vistamatt VS381C is a synthetic amorphous silica matting agent (CAS 7631-86-9) produced by Longyan Vista Chemical Co., Ltd. for industrial & metal coatings. Its typical D50 is 8.0-8.3 µm, with a BET specific surface area of 82 m²/g and an oil absorption of 125 g/100 g.
What is the recommended dosage of Vistamatt VS381C?
Vistamatt VS381C has no single fixed dosage published, because the required loading depends on binder, target gloss and film build. Dosage should always be adjusted to match the gloss of the incumbent grade rather than copied from its loading, because matting efficiency differs between grades at equal particle size.
What gloss level can Vistamatt VS381C reach?
The gloss reachable with Vistamatt VS381C depends on binder chemistry, loading and film build, and should be established by screening at matched gloss. Gloss is measured to ASTM D523 or ISO 2813; readings taken at 20° and 60° on the same panel are not comparable.
What is the particle size distribution of Vistamatt VS381C?
Vistamatt VS381C has a D10 of 6.3 µm, a D50 of 8.0-8.3 µm and a D90 of 10.2 µm, measured by laser diffraction to ISO 13320. Distribution width matters more than mean size for gloss uniformity across batches.
How should Vistamatt VS381C be dispersed?
Vistamatt VS381C is added under moderate shear during the let-down stage and dispersed until no agglomerates remain. With a tamped bulk density of 0.42 g/cm³, wetting-in time should be checked on a fineness gauge before extending grind time, since over-grinding can reduce matting efficiency.
Is Vistamatt VS381C suitable for waterborne systems?
Vistamatt VS381C carries a pH of 6.1 in 5 % suspension and a loss on drying of 5.9 %. Suitability for a specific waterborne, solventborne or UV system depends on binder chemistry and catalyst package, and should be confirmed by screening in the actual formulation.
What documentation is available for Vistamatt VS381C?
A TDS covering Vistamatt VS381C, a 16-section GHS SDS and a TSCA compliance statement are available from the downloads page. A batch-specific certificate of analysis is supplied on request, tested to HG/T 3061-2020.
Is synthetic amorphous silica REACH registered?
Synthetic amorphous silica carries CAS 7631-86-9. REACH status depends on the importer of record and the destination market, and is confirmed on enquiry per shipment rather than stated as a blanket claim.
What packaging and shelf life apply to Vistamatt VS381C?
Vistamatt VS381C carries a 24-month shelf life when stored sealed in a dry place away from direct sunlight. Packaging and minimum order quantity are confirmed at enquiry.
How can I get a sample of Vistamatt VS381C?
Vistamatt supplies free 200-500 g evaluation samples of VS381C with freight prepaid, shipped with a screening plan matched to the customer's system. Send resin system, target gloss, application method and film build to receive a starting dosage recommendation.
Request a sample of Vistamatt VS381C
Send your resin system, target gloss, application method and film build. Vistamatt ships a free 200-500 g sample with freight prepaid, together with a screening plan matched to your system.