- Application: Powder Coating (Polyethylene terephthalate system) for Aluminum Products
- Location: Anhui Province, China
- Problem: Poor free flow performance, easy to cake after certain days, powder coat can’t spray out
- Functions: HIFULL fumed silica in powder coating, Prevent powder coating from moisture, avoid caking issues, improve flow ability
Hydrophilic fumed silica is more often used in water-based coatings for thickening, sag-resistance or sedimentation resistance. In contrast, hydrophobic fumed silica is more suitable for powder coating to avoid caking due to its water-repellent properties, such as HIFULL HB-151 or HIFULL HB-630.
This client has tested two grades of HIFULL hydrophobic fumed silica HB-151 & HB-630, HIFULL HB-630 shows better performance on flow aid and cake resistance. HB-630 has a larger specific surface area than HB-151, so it has better water-repellent properties and anti-cake. HIFULL HB-630 is more suitable for this customer’s powder coating product.