Matting Agent Alternative
SYLOID® 621 / 622 alternative: Vistamatt VS391C
Looking for a Grace SYLOID® 621 / 622 alternative? Vistamatt VS391C is matched on particle route and application for industrial & metal (thick film), backed by TDS/SDS/TSCA documentation and free samples.
Specification comparison
| Property | SYLOID® 621 / 622 (Grace) | Vistamatt VS391C |
|---|---|---|
| Chemical basis | Amorphous silica | Synthetic amorphous silica (CAS 7631-86-9) |
| Type | Untreated, large particle size, medium pore volume | Synthetic silica matting agent |
| Particle size D50 | large | 9.0-9.5 µm |
| Recommended dosage | typ. 2-6% | 2-4% (system-dependent) |
| Applications | thick-film systems, anti-skid, powder and radiation cure | industrial & metal (thick film) |
SYLOID® 621 / 622 data from public technical datasheets; trademarks belong to Grace. Comparison for cross-reference only.
Matching conclusion
Both coarse-particle silicas for thick-film and high-build systems needing efficient matting. VS391C matched on the coarse route for industrial and metal thick-film coatings.
Vistamatt matches on the particle route and application rather than claiming an identical product. Qualify a replacement by screening VS391C against your current SYLOID® 621 / 622 control at matched gloss, holding dispersion, film build and cure constant.
Evaluation positioning. Vistamatt VS391C is designed for evaluation in applications currently using SYLOID® 621 / 622, and offers comparable performance in the application described above when qualified at matched gloss. Published figures indicate a similar performance range based on internal testing; they are not a guarantee of equivalence in your formulation.
Trademark notice. SYLOID is a trademark of W. R. Grace & Co.-Conn.. Vistamatt and Longyan Vista Chemical Co., Ltd. are not affiliated with, endorsed by, or connected to W. R. Grace & Co.-Conn. in any way. Competitor grade names are used solely for identification and comparison purposes. Specifications quoted for competitor products are taken from their publicly available technical data sheets and are not independently verified by Vistamatt. This page compares published specifications; it does not report side-by-side performance testing. Suitability must be confirmed by screening in your own system.
Frequently asked questions
Is VS391C a direct replacement for SYLOID® 621 / 622?
VS391C is matched to SYLOID® 621 / 622 on particle route and application, not sold as an identical drop-in. Both are amorphous silica matting agents for industrial & metal (thick film). Qualify by screening VS391C against your current SYLOID® 621 / 622 control at matched gloss.
How do the particle sizes compare?
SYLOID® 621 / 622 runs at a large particle profile; VS391C is 9.0-9.5 µm (D50). Matching on particle route is the starting point; final selection depends on target gloss, film build and system.
What dosage should I start with?
SYLOID® 621 / 622 is typically used at typ. 2-6% on total formulation. VS391C starts at 2-4% for most systems. Confirm by screening at matched gloss, not matched loading.
Can I get a sample to test against SYLOID® 621 / 622?
Yes. Vistamatt provides free 200-500 g samples (freight prepaid by Vistamatt), shipped with a screening plan matched to your system. Send your resin system, target gloss, application method and film build.
Test VS391C against your SYLOID® 621 / 622 control
Send your resin system, target gloss, application method and film build. We'll ship a free 200-500 g sample with a screening plan matched to your system.