Silicon dioxide, 99.998%, (trace metal basis) | 437150050 | Thermofisher

Description

Specifications Table

Product Name – Silicon dioxide, 99.998%, (trace metal basis)
Quantity/Pack Size – 5GR, 20GR, 100GR
Form – Fine powder
Grade – 99.998% (trace metal basis)
Application – High-precision synthesis, semiconductor fabrication, analytical standards

Product Overview

Silicon dioxide (SiO₂) at 99.998% purity (trace metal basis) is an ultra-high-grade amorphous powder engineered for applications demanding minimal metallic contamination. Its fine particle size ensures uniform dispersion in solutions, making it ideal for semiconductor processing, optical coatings, and as a reference material in analytical chemistry. The trace metal basis specification guarantees that residual metallic impurities—such as iron, aluminum, or titanium—are reduced to parts-per-million levels, preventing interference in sensitive experiments. This grade of silicon dioxide is synthesized through controlled precipitation or fuming processes, followed by rigorous purification to eliminate adventitious contaminants. Its high surface area and reactivity enable efficient use in catalytic supports, while its thermal stability (melting point ~1,710°C) ensures reliability in high-temperature applications. The powder’s consistent particle distribution minimizes batch-to-batch variability, critical for reproducible results in research and industrial settings. Compatible with most organic solvents and aqueous systems, it integrates seamlessly into existing workflows without requiring additional preprocessing.

FAQs

1. What is the difference between 99.998% trace metal basis and standard-grade silicon dioxide?

The 99.998% trace metal basis grade undergoes additional purification to reduce metallic impurities (e.g., Fe, Al, Ti) to ≤10 ppm, whereas standard grades may contain higher levels of these contaminants, affecting performance in sensitive applications.

2. Can this silicon dioxide be used in high-temperature applications above 1,000°C?

Yes, this grade remains stable up to ~1,710°C, making it suitable for furnace linings, refractory materials, and thermal insulation applications without decomposition or phase changes.

3. Is this product compatible with hydrofluoric acid (HF) etching processes?

Silicon dioxide reacts with HF to form soluble silicic acid, so it is not chemically compatible. Use HF-resistant alternatives like PTFE or polypropylene containers for storage if HF exposure is expected.

4. How should this powder be stored to prevent moisture absorption?

Store in a tightly sealed container under inert gas (e.g., nitrogen or argon) in a desiccator. Avoid exposure to humid environments, as amorphous silica can absorb up to 10% moisture by weight.

5. What alternatives exist for applications requiring lower purity but higher surface area?

Consider fumed silica (e.g., 99.8% purity) or precipitated silica, which offer larger surface areas (150–400 m²/g) at lower cost, though with higher trace metal content.