Sodium Silicate (Peroxide Bleaching Stabilizer)
CAS Number: 1344-09-8
Sodium silicate (waterglass) serves as an essential stabilizer in alkaline hydrogen peroxide bleaching of mechanical and recycled pulps. It deactivates heavy metal ions (Mn, Fe, Cu) that catalyze the decomposition of hydrogen peroxide, ensuring efficient utilization of the oxidant for brightness gain. Sodium silicate also provides alkalinity buffering and contributes to the dispersing and saponifying of ink during deinking.
Technical Specifications
| appearance | Colorless to pale yellow viscous liquid |
| Na₂O content (%) | 7–10 |
| SiO₂ content (%) | 26–30 |
| density (g/mL, 20°C) | 1.35–1.40 |
| modulus (SiO₂/Na₂O molar ratio) | 2.0–3.5 |
Applications
- Hydrogen peroxide stabilizer in alkaline mechanical pulp bleaching
- Alkali buffer in peroxide brightening of TMP and CTMP
- Deinking of wastepaper in alkaline peroxide systems
- Saponification and ink dispersion in deinking pulper
- Adhesive and binder for corrugated board
Key Features
- Deactivates heavy metal ions that destroy hydrogen peroxide
- Provides alkaline buffering for consistent pH during bleaching
- Disperses and saponifies ink in alkaline deinking systems
- Low cost and readily available chemical for large-scale use
Send Inquiry
More in Paper / Pulp Chemicals
AKD Sizing Agent (Alkyl Ketene Dimer)
ASA Sizing Agent (Alkenyl Succinic Anhydride)
26680-54-6
Alum (Papermaking Grade Aluminum Sulfate)
10043-01-3
Anionic Polyacrylamide (Paper Grade)
9003-05-8
Anthraquinone (Kraft Pulping Additive)
84-65-1
Bentonite Microparticle (Retention & Drainage Aid)
1302-78-9
Black Liquor Evaporation Antifoam (Silicone Defoamer)
Broke Repulping and Disintegration Aid