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Food grade silica from Wacker: High-Purity Solutions Empowering the Global Food Industry
In the modern food industry, high-quality functional additives are the cornerstone of product stability, process efficiency and consumer safety. As a global leader in specialty chemicals, Wacker Chemie provides food-grade silica (silicon dioxide) solutions represented by the HDK® NUTRITION series, which integrate ultra-high purity, strict compliance and excellent performance, and have become a preferred choice for food manufacturers worldwide.
1. Product Overview: Premium Food-Grade Silica by Wacker
Wacker food-grade silica is a synthetic, hydrophilic amorphous silica produced via flame hydrolysis, belonging to the HDK® pyrogenic silica product line. The representative model HDK® N20 NUTRITION is specially developed for food and feed applications, with a chemical formula of SiO₂ and a molecular weight of 60.08.
This product is a white fine powder with an average particle diameter of less than 15 μm, smooth to the touch, odorless and tasteless—fully matching the core characteristics of high-quality food-grade silica. Relying on Wacker’s 50+ years of production experience and integrated manufacturing system with statistical process control, it achieves exceptional batch-to-batch consistency and purity.
2. Core Physical & Chemical Properties
Wacker food-grade silica meets strict international food-grade specifications, with key indicators far exceeding industry benchmarks:
- Main Content: SiO₂ content ≥99.0% after ignition
- Physical Form: White fine powder, average particle size <15 μm, odorless, tasteless
- Loss on Drying: ≤7.0% (105℃, 2 hours)
- Loss on Ignition: ≤8.5% (dried sample, 1000℃, 30 minutes)
- Chemical Inertness: Stable in food systems, no reaction with ingredients, no impact on flavor and nutrition
3. Strict Purity & Safety Testing Standards
To ensure food safety, Wacker implements full-process quality control and complies with the strictest purity requirements, covering heavy metals, soluble substances and elemental impurities:
- Water-soluble substances: ≤5.0% (calculated on dried substance)
- Heavy metal limits:
- Lead (Pb): ≤5 μg/g
- Arsenic (As): ≤1.5 μg/g
- Elemental impurities:
- Sodium (as Na₂O): ≤0.20%
- Aluminum (as Al₂O₃): ≤0.20%
- Iron (as Fe₂O₃): ≤0.50 mg/g
All testing methods follow international standard procedures, including atomic absorption spectroscopy and hydrofluoric acid dissolution identification, ensuring accurate and reliable results.
4. Core Applications in the Food Industry
Wacker food-grade silica (EU food additive code E551, INS 551) is widely used in food processing with three core functions:
- Anti-caking & flow improvement: Prevents agglomeration of powdered foods (salt, spices, milk powder, protein powder) and improves pouring and filling efficiency
- Rheology control: Acts as a thickener and thixotropic agent for liquid foods, marinades and cooking oils
- Stability enhancement: Maintains texture and shelf-life stability of processed foods
It is also widely used in feed processing, improving the flowability of feed powder and optimizing production efficiency.
5. Global Compliance & Certification
Wacker food-grade silica has obtained full international certification, adapting to global market access requirements:
- Complies with (EU) 231/2012 (E551 silica specifications)
- Meets FCC (Food Chemicals Codex) and JECFA standards
- Complies with Chinese food contact material standard GB 9685-2016
- HACCP certified for production, packaging and storage
- Halal and Kosher certified, suitable for special dietary needs
Toxicological assessments confirm it is non-toxic, non-irritating, not absorbed by the human body, and excreted naturally—safe for use within regulated limits.
6. Wacker’s Technical Advantages
- Mature production process: Flame hydrolysis technology ensures high purity and uniform particle size
- Customized solutions: Professional technical team provides application support and formula optimization
- Full traceability: Raw material to finished product traceability system meets food safety management requirements
- Global supply: Stable supply chain to serve food manufacturers in Europe, Asia, North America and other regions
7. Conclusion
Wacker food-grade silica is not only a high-performance functional additive, but also a reliable partner for food enterprises to pursue quality and safety. With ultra-high purity, strict compliance and excellent functionality, it helps optimize food production processes, improve product quality and meet the increasingly stringent needs of the global food industry.
As food safety and processing standards continue to rise, Wacker will continue to rely on technological innovation to provide safer, more efficient and more sustainable silica solutions for the global food industry.
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Food grade silica from Wacker: High-Purity Solutions Empowering the Global Food Industry
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