Silica Gel Crystal White
Silica Gel Crystal White
| Product Category | Loose |
|---|---|
| Adsorption Capacity | ≥ 30% at 90% RH (High Capacity) |
| Quality Standards | 100% Non-Toxic, DMF Free, ISO Certified |
| Packaging Options | Pouches (0.5g - 1000g), Bulk Bags, Drums |
| Supply Lead Time | Immediate Ready Stock & Fast Dispatch |
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Detailed Description & Specifications
Loose White Silica Gel Crystals
Loose White Silica Gel Crystals are non-indicating, high-purity amorphous silicon dioxide (SiO2 ≥ 98.5%) desiccants characterized by an irregular, angular crystalline geometry. Unlike spherical beads that roll and settle under movement, these faceted crystals interlock mechanically, establishing a stable, shift-resistant bed inside containers, dynamic transit packaging, and heavy industrial enclosures.
The active media operates through physical capillary condensation, drawing ambient water vapor into its internal sub-nanometer pore matrix without undergoing chemical transformation, liquefaction, or crystalline breakdown. It remains solid and dry to the touch even when fully saturated, producing zero corrosive brine runoff or acidic emissions. It is 100% free of Dimethyl Fumarate (DMF), cobalt salts, and toxic biocides, making it safe for sensitive export shipments.
Structural Architecture & Morphology
- Pore Architecture: The material possesses an internal network of interconnected micropores with an average diameter of 2.0 to 3.0 nm. This produces an active specific surface area between 650 and 800 m²/g, facilitating high vapor capture at both moderate and elevated relative humidity levels.
- Mechanical Interlocking Matrix: Unlike spherical beads that slide past one another, angular crystal facets nest and interlock when poured. This locks the desiccant mass in place, preventing bed settling, compaction voids, and internal particle friction during vibration.
- Static Load Resistance: The faceted structure provides high static crush resistance (≥ 95 N), resisting fragmentation under stacked bulk loads or heavy industrial machinery bases.
- Non-Deliquescent Physical State: Water molecules bond physically to the active silanol (Si–OH) groups lining the inner walls via hydrogen bonding. The external surface remains completely dry throughout the entire adsorption cycle.
Technical Data Sheet (TDS)
1. Chemical & Physical Baseline
| Technical Parameter | Certified Specification | Testing Standard / Protocol |
|---|---|---|
| Chemical Formula | SiO2 · nH2O (Amorphous Silicon Dioxide) | Pure Synthetic Silicate |
| SiO2 Assay (Purity) | ≥ 98.5% (Typical: 99.2% – 99.5%) | Gravimetric Assay / ASTM D1993 |
| Physical Appearance | Vitreous, irregular, faceted transparent/white crystals | Visual Inspection |
| Bulk Density | 700 – 780 g/L (0.70 – 0.78 g/ml) | ASTM D4284 / DIN ISO 787-11 |
| Specific Surface Area (BET) | 650 – 800 m²/g | Nitrogen Porosimetry (N2) |
| Total Pore Volume | 0.35 – 0.45 ml/g | Nitrogen Adsorption |
| Average Pore Diameter | 2.0 – 3.0 nm (20 – 30 Å) | Micropore Analysis |
| Static Crush Resistance | ≥ 95 N | Digital Hardness Tester |
| Loss on Drying (LOD @ 150°C) | ≤ 2.0% (Packaged Condition) | DIN 55473 |
| pH Value (10% Aqueous Sol.) | 5.5 – 7.5 (Neutral) | Potentiometric Meter |
| Specific Electrical Resistance | ≥ 4000 Ω · cm | IS 3401 |
| Attrition / Friability Loss | < 0.1% | Mechanical Tumble Test |
2. Moisture Adsorption Capacity (Equilibrium at 25°C)
| Relative Humidity (% RH) | Guaranteed Minimum Uptake | Typical Performance Range |
|---|---|---|
| 20% RH | ≥ 10.5% by weight | 10.8% – 12.0% |
| 50% RH | ≥ 25.0% by weight | 26.0% – 28.5% |
| 90% RH | ≥ 36.0% by weight | 36.5% – 38.5% |
3. Standard Sieve & Particle Fractions
| Sieve Fraction | US Mesh Equivalent | Recommended Operational Applications |
|---|---|---|
| 1.0 – 3.0 mm | ~ 6 – 16 Mesh | High surface-to-volume ratio; automated small sachet packaging (0.5g to 10g) and narrow filter cartridges. |
| 2.0 – 4.0 mm / 2.0 – 5.0 mm | ~ 4 – 10 Mesh | General industrial workhorse grade; balanced adsorption kinetics for cargo shrink-wraps and static enclosure desiccation. |
| 3.0 – 5.0 mm | ~ 4 – 6 Mesh | Maximum static load strength; large equipment voids, bulk storage bins, and machinery skids. |
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