aSuprtech specialty chemicals · High-purity colloidal silica
Low-metal and ultra-high-purity grades for wafer, sapphire and optical polishing, high-end catalysts and anti-reflective coatings. Tell us the particle size, purity and pH you need, and we match the grade you use today or tailor a new one. Standard grades for catalysts, coatings and casting are also available.
COA with every batch · Trace-metal reports on request · Free samples · Ships from Shanghai, Ningbo, Qingdao, Guangzhou and other Chinese ports
Particle size map
Average particle size by dynamic light scattering. If your target falls between grades, we produce to that size.
Product line · Colloidal silica
Ultra-high purity
Made by the Stöber process from purified silicate esters, giving monodisperse particles with heavy metals below ICP-MS detection limits. For precision polishing, anti-reflective coatings, electronic materials and high-end catalysts. Supplied by project, in limited volumes.
High purity
Potassium-stabilized grades at about 40% solids, made from high-purity raw materials with an added purification step. Total trace metals below 100 ppm, excluding Na and K. For precision polishing, metallographic final polishing and optical coatings.
Standard
Sodium, ammonium, acidic, neutral, alumina-modified and silane-modified, from 4 to 110 nm. For catalyst binders, coatings, refractories, paper and printing.
| Grade | Family | Particle size (DLS) | SiO₂ | pH | Stabilizer | Typical use | TDS |
|---|---|---|---|---|---|---|---|
| CS-UP 70N | Ultra-high purity | 72 nm | 20% | 7.0–7.5 | Low-ion, near neutral | AR coatings, high-purity catalysts, electronics | Request TDS |
| CS-UP 135K | Ultra-high purity | 137 nm | ≈40% | 9.5–10.5 | Potassium | Large-particle polishing, wafer and substrate stock removal | Request TDS |
| CS-HP 27K | High purity | 27 nm | ≈40% | 9–11 | Potassium | Glass, optical and hard-disk substrate final polishing | Request TDS |
| CS-HP 41K | High purity | 41 nm | ≈40% | 9–11 | Potassium | Precision polishing, metallographic final polishing | Request TDS |
| CS-HP 74K | High purity | 74 nm | ≈41% | 9–11 | Potassium | Sapphire and SiC substrate polishing | Request TDS |
| CS-CAT series | Standard | 5–60 nm | up to 34% | 2–10 | Ammonium, acidic, neutral | Zeolite and molecular-sieve binders, washcoats | Request TDS |
| CS-COAT series | Standard | 4–110 nm | up to 40% | 2–11 | Silane-modified, acidic, neutral, alumina-modified, sodium | Wood and clear coats, sol-gel, inorganic and heat-resistant coatings | Request TDS |
Particle size and SiO₂ are typical values from production batches; pH is the specification range. Full TDS, SDS, COA and trace-metal data are available on request. Request technical data
Applications
Key specs: particle size and distribution, trace metals, large-particle count, batch consistency
Recommended: CS-HP grades, CS-UP 135K
Application guides: Metallographic final polishing · Sapphire polishing
Key specs: Na content, particle size, binding strength
Recommended: CS-CAT series; low-sodium grades on request
Key specs: resin compatibility, clarity, pH, surface modification
Recommended: CS-COAT series, CS-UP 70N for anti-reflective coatings
Key specs: particle size, charge (anionic or cationic), purity
Recommended: sodium, neutral and alumina-modified grades
Key specs: solids, stability, cost per kg of SiO₂
Recommended: sodium and ammonium grades
Also used in: gel batteries, anti-fog greenhouse films, textiles, ceramics, metal surface treatment and water treatment.
Custom grades
Most customers start by sending the grade they use today. We match it, or adjust particle size, solids, pH, stabilizer and impurity limits to fit your process. Tell us if your spec is based on BET or titration size, as these read smaller than DLS.
Application, current grade if any, and the parameters that matter to you.
We confirm whether an existing grade fits or a tailored grade is needed, with a sample date.
Each sample ships with a COA. Particle size distribution report and SEM images on request.
We adjust from your test results, then fix the grade in a written specification for every batch.
Your specifications and test data are kept confidential.
Quality
Storage
Store between 5 and 35 °C. Frozen colloidal silica gels irreversibly, so we plan winter shipments to avoid low temperatures.
Documents
About aSuprtech
aSuprtech is the specialty chemicals brand of aSupr. Our products are produced by qualified manufacturing partners in China under our specifications and quality control. We manage formulation, documentation and technical support, so you deal with one supplier from first sample to repeat orders. Colloidal silica is our core product line, and we serve valued customers around the world.
Request a sample
A short answer is enough to start. Samples are free; freight is paid by the customer, by courier account or in advance. Ultra-high-purity samples are arranged by project.