HMDS-treated hydrophobic fumed silica on a 200 BET carrier — the gold standard for LSR and HTV silicone rubber, with optical clarity and mechanical reinforcement.
Acts as a powerful reinforcing filler for HTV silicone rubber and LSR. It boosts tear strength and tensile properties while maintaining the highest optical clarity.
The ideal anti-settling agent in coatings. It prevents pigment sedimentation in clear coats and high-gloss finishes without affecting the final transparency.
Serves as an advanced anti-caking aid for sensitive powders. It provides superior fluidization and protects high-value powder formulations from moisture-induced clumping.
Ensures stable thixotropy for printing inks and structural adhesives. It allows for high-build applications with zero sagging, even under high shear conditions.
As a specialized high hydrophobicity silica for LSR, the HMDS treatment ensures the highest transparency in liquid silicone rubber, providing invisible reinforcement without compromising optical quality or color stability.
Based on a hydrophobic silica with 200 BET carrier, it delivers exceptional tear strength and tensile modulus in HTV elastomers, making it the gold standard for high-durability and high-precision silicone parts.
This HMDS surface modified silica features an impenetrable moisture shield that protects moisture-sensitive electronic coatings and high-value powder formulations.
SemiSIL R620 acts as a precision anti-sagging agent in coatings and printing ink, building a temperature-stable 3D network that ensures perfect pigment suspension and zero vertical slump in high-gloss clear coats.
Note: All parameters of our HMDS treated fumed silica R620 meet international industrial standards.
| Property | Standard Value | Unit | Method |
|---|---|---|---|
| Specific Surface Area (BET) | 200 ± 20 | m²/g | GB/T 20020 |
| pH Value (in 4% dispersion) | 5.5 ~ 8.0 | – | GB/T 20020 |
| Carbon Content | 1.5 ~ 2.1 | Wt% | GB/T 20020 |
| Loss on Drying (2h @ 105°C) | ≤ 0.7 | Wt% | GB/T 20020 |
| Loss on Ignition (2h @ 1000°C) | ≤ 4.0 | Wt% | GB/T 20020 |
| Tamped Density | 40 ~ 60 | g/L | GB/T 20020 |
| Silica Content (SiO₂) | ≥ 99.8 | % | GB/T 20020 |
Note: All parameters of our HMDS treated fumed silica R620 meet international industrial standards.
Non-DG Compliance: Fully safe for Railway, Sea (Shipping), and Truck transportation. 20'FCL Loading • 180kg / pallet…
Non-DG Compliance: Fully safe for Railway, Sea (Shipping), and Truck transportation.
20'FCL Loading • 180kg / pallet (18 bags) • 10 pallets / 1800kg total
40'HQ Loading • 220kg / pallet (22 bags) • 20 pallets / 4400kg total
Yes. SemiSIL R620 is a 1:1 technical equivalent to industry-standard HMDS grades like Aerosil R812. It is based on a 200 BET carrier and features the same HMDS surface modified silica chemistry, making it a reliable drop-in replacement for high-performance elastomers and coatings.
SemiSIL R620 is the premier high hydrophobicity silica for LSR because the HMDS treatment creates a highly compatible interface with silicone polymers. It provides superior mechanical reinforcement (tear and tensile strength) while maintaining ultimate optical clarity, which is essential for medical-grade and high-transparency silicone parts.
As a hydrophobic silica with 200 BET, R620 builds a much denser thixotropic network compared to lower surface area grades. This makes it an elite anti-sagging agent in coatings, ensuring that even high-build clear coats remain uniform on vertical surfaces without settling or cloudiness.
SEMISIL R620 offers extreme water repellency. It acts as a permanent moisture barrier, preventing micro-clumping in technical powders and ensuring that sensitive printing inks maintain stable rheology even in tropical climates.
Choose SemiSIL R620 when optical clarity and maximum reinforcement are your top priorities, particularly in LSR and HTV. Choose R202 when you need the "silicone oil" effect to prevent crepe hardening in HCR or require maximum stability in polar resins like epoxy.
Free 1 kg sample for qualified buyers. Factory-direct pricing. 48h dispatch from Anhui R&D center.