DDS-treated hydrophobic fumed silica for RTV silicone sealants and printing inks; long shelf-life thixotrope with superior anti-sagging.
SemiSIL R272 is a high-performance DDS treated fumed silica (Dimethyldichlorosilane treated) optimized for moisture-sensitive formulations. By precisely reducing surface silanol density, R272 acts as a superior long shelf-life thixotropic agent, preventing viscosity drift in RTV silicone sealants and ensuring permanent pigment suspension in high-end printing inks.
Surface Treatment: DDS (Dimethyldichlorosilane)
Surface Area (BET): 100 ± 20 m²/g
CAS Number: 112945-52-5
Carbon Content: 0.6% – 1.2%
Key Advantage: Superior RTV sealant stability, extended shelf-life protection, and optimized rheology control for printing inks.
The industry-standard hydrophobic silica for RTV silicone sealant. It ensures a long shelf-life by preventing viscosity drift and maintaining stable thixotropy in the tube.
Delivers precise rheology control for RTV-T adhesives. It provides excellent non-sag properties and reinforcement for construction and industrial bonding.
Functions as a specialized anti-settling agent for printing inks. It keeps pigments in permanent suspension while ensuring optimal flow during high-speed printing.
Serves as a high-performance free flow aid for powder coatings. It protects particles from moisture-induced clumping and improves fluidization in spray booths.
As a premier DDS treated fumed silica, it effectively reduces surface silanol density, preventing the thickening of RTV sealants during storage and ensuring a consistent 24-month shelf-life.
This DDS treated fumed silica builds a stable thixotropic network in silicone fluids, providing the necessary body and structure for non-slump adhesives and printing inks.
With controlled carbon content (0.6%~1.2%), this DDS treated fumed silica minimizes water absorption ($\leq 0.5\%$), protecting moisture-curable systems from premature skinning or hardening.
SemiSIL R272 functions as a high-efficiency DDS treated fumed silica filler, delivering unmatched tear strength in elastomers while maintaining pigment suspension in high-end coatings and inks.
Note: All parameters of our DDS treated fumed silica R272 meet international industrial standards.
| Property | Standard Value | Unit | Method |
|---|---|---|---|
| Specific Surface Area (BET) | 100 ± 20 | m²/g | GB/T 20020 |
| pH Value (in 4% dispersion) | 4.0 ~ 7.0 | – | GB/T 20020 |
| Carbon Content | 3.5 ~ 5.5 | Wt% | GB/T 20020 |
| Loss on Drying (2h @ 105°C) | ≤ 0.5 | Wt% | GB/T 20020 |
| Loss on Ignition (2h @ 1000°C) | ≤ 2.0 | 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 DDS treated fumed silica R272 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 R272 is a 1:1 technical replacement for standard DDS-treated hydrophobic fumed silica grades. It matches the surface area and carbon content specifications required for RTV silicone sealants and industrial coatings, ensuring a seamless drop-in transition.
SemiSIL R272 is a specialized long shelf-life thixotropic agent. Because it is treated with DDS (Dimethyldichlorosilane), it significantly reduces surface hydroxyl density, preventing the thickening and "viscosity drift" common in moisture-curable sealants during storage.
R272 builds a strong 3D physical network in silicone fluids. This provides superior rheology control for RTV-T adhesives, ensuring that the sealant stays in place on vertical joints without sagging, even at high application temperatures.
Absolutely. R272 acts as a high-efficiency anti-settling agent for printing inks. Its hydrophobic surface prevents pigment agglomeration, ensuring that color consistency and flow properties are maintained even in low-viscosity ink formulations.
The difference between PDMS and DDS treated silica is primarily the carbon load and application focus. DDS treated fumed silica (R272) has lower carbon content ($0.6-1.2\%$), making it more economical and effective for RTV sealants, while PDMS (R202) is designed for extreme hydrophobicity and anti-structuring in rubber.
Free 1 kg sample for qualified buyers. Factory-direct pricing. 48h dispatch from Anhui R&D center.