Hydrated Silica 113 — Mild-Abrasive Oral Care Grade
SEMITECH Hydrated Silica 113 is a precipitated silica engineered for oral care applications requiring effective yet enamel-safe abrasion. With an ASTM RDA of 100–120, it delivers reliable plaque and pellicle removal from daily-use toothpaste formulations without crossing into aggressive enamel wear territory. The product meets the purity and heavy-metals requirements appropriate for direct oral contact applications.
Hydrated Silica 113 is compatible with fluoride, anti-tartar agents, and common toothpaste rheology modifiers. Its controlled particle size and low oil absorption make it easy to process in standard planetary mixer or continuous toothpaste manufacturing lines.
Technical Specifications
| Properties and Test Methods | Unit | Typical Value | Standardization |
|---|---|---|---|
| BET specific surface area | m²/g | 80–120 | — |
| ASTM RDA | — | 100–120 | ISO 11609 |
| pH (10% slurry) | — | 6.5–9.0 | — |
| Loss on drying (105°C, 2h) | Wt% | ≤6.0 | — |
| SiO₂ content (dry basis) | Wt% | ≥94.0 | — |
| Oil absorption | mL/100g | 80–120 | GB/T 5211.15 |
| Heavy metals (as Pb) | ppm | ≤20 | — |
| Median particle size d50 | μm | 8–15 | — |
Application Suggestions
Daily-Use Toothpaste (Mild Cleansing)
Hydrated Silica 113 is the standard workhorse abrasive for daily-use family toothpaste targeting effective plaque removal without enamel sensitivity risk. At RDA 100–120, it sits within the ADA-accepted safe range for daily use (RDA ≤250) while providing cleaning efficacy comparable to calcium carbonate-based formulations, with the significant advantage of fluoride compatibility — precipitated silica does not bind or inactivate fluoride ions.
Sensitive Teeth Formulations
The moderate RDA and controlled particle morphology make Hydrated Silica 113 appropriate for sensitive-teeth variants where the formulator needs cleaning efficacy but must avoid excessive mechanical irritation of exposed dentine. Typical loading is 10–20 Wt% in the finished paste.
Children's Toothpaste
The RDA 100–120 range is well within the conservative targets used for children's oral care formulations, making this grade suitable for junior/children's toothpaste where regulators or brand guidelines specify reduced abrasivity.
Natural and Herbal Toothpaste
Hydrated Silica 113's clean SiO₂ composition (≥94.0%) and low heavy-metals profile support natural and herbal toothpaste claims. It is free of added binders, coatings, or organic processing aids that may conflict with natural formulation positioning.
Technical Support & FAQ: Hydrated Silica 113
+Q1: What are the key performance characteristics?
The defining characteristic is the RDA 100–120 range, which places this grade in the mild-to-moderate abrasive category suited to daily use. Combined with BET 80–120 m²/g, it provides the cleaning surface area needed for effective pellicle removal while its oil absorption (80–120 mL/100g) is low enough to process in standard toothpaste equipment without excessive thickening.
+Q2: How does it compare to higher-RDA grades like Hydrated Silica 165?
Hydrated Silica 113 (RDA 100–120) is designed for daily-use and sensitive formulations. Hydrated Silica 165 (RDA 150–170) is for whitening and stain-removal formulations where more aggressive cleaning of extrinsic stains from coffee, tea, and tobacco is required. The choice depends on the intended consumer claim and dermatological/dental safety testing targets.
+Q3: What factors affect pricing?
Oral care grade silica is priced at a modest premium over industrial grades due to purity requirements and heavy-metals testing. Volume (FCL vs. LCL), packaging (25 kg food-grade bags), and destination port are the main pricing variables. Contact info@semitechnm.com for a quotation.
+Q4: What are lead times and payment terms?
Standard lead time is 7–14 days from order confirmation. Payment terms: T/T, L/C, D/P. Free samples of 200g–1kg are available for laboratory toothpaste trials on request.
Packing & Storage Information
20′ FCL Container Approximately 18–20 MT in 25 kg multi-wall food-grade kraft bags. Each bag is inner PE-lined to prevent moisture ingress.
40′ HQ Container Approximately 20–22 MT in 25 kg bags or 500 kg jumbo bags. Jumbo bag format is available for large-scale toothpaste manufacturers with bulk handling capability.
Storage Conditions Store in a cool, dry, well-ventilated warehouse away from moisture and strong acids. Shelf life is 24 months in original sealed packaging. Hydrated silica is non-toxic and non-hazardous under normal storage conditions.