Silica Gel Bead 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 Beads
Loose White Silica Gel Beads are non-indicating, high-purity amorphous silicon dioxide (SiO2 ≥ 98.5%) synthetic desiccants manufactured in vitreous, spherical bead morphology. Engineered for static and dynamic moisture extraction, the beads capture ambient water vapor through physical capillary condensation within an internal network of sub-nanometer pores without undergoing chemical reactions, phase transitions, or dissolution.
Because the adsorption mechanism relies purely on physical surface forces and hydrogen bonding with internal silanol groups (Si–OH), the beads remain solid, structurally stable, and dry to the touch even at full moisture saturation. Unlike deliquescent salt desiccants (such as calcium chloride), white silica gel beads generate zero corrosive liquid brine runoff, emit no toxic off-gases, and are non-reactive with sensitive industrial substrates. The product is 100% free of Dimethyl Fumarate (DMF), cobalt salts, and toxic biocides, making it fully compliant with international environmental and consumer safety directives.
Structural & Micro-Pore Architecture
- Spherical Hydrodynamic Morphology: The smooth, uniform spheroidal geometry is engineered specifically for column-flow dynamics. When loaded into deep desiccant beds or drying towers, spherical beads self-level into a uniform packed bed that reduces interstitial void variation, prevents fluid channeling, and delivers minimal pressure drop across high-velocity gas and air streams.
- Nanoporous Capillary Network: The internal matrix comprises interconnected micropores with a narrow average pore diameter of 2.0 to 3.0 nm. This micro-architecture creates an extensive specific surface area of 650 to 800 m²/g, enabling rapid adsorption kinetics and high volumetric water vapor uptake across moderate and elevated relative humidity levels.
- Mechanical Crush Resistance & Low Attrition: Vitreous spherical beads possess exceptional individual compressive strength (≥ 120 N/bead) and high spherical retention (≥ 98%). This structural rigidity resists decrepitation, fragmentation, and powder attrition under dynamic cyclical pressure swings and heavy static column loads.
- Non-Deliquescent Adsorption State: Water molecules bond physically within the active nanopores via physical adsorption. The exterior spherical shell remains solid and non-tacky, eliminating the risk of bead agglomeration, cake formation, or casing corrosion.
Technical Data Sheet (TDS)
1. Chemical & Physical Baseline
| Technical Parameter | Standard Specification | Testing Protocol / Reference |
|---|---|---|
| Chemical Formula | SiO2 · nH2O (Amorphous Silicon Dioxide) | Synthetic Silicate Matrix |
| Silicon Dioxide (SiO2) Assay | ≥ 98.5% (Typical: 99.2% – 99.5%) | Gravimetric Analysis / ASTM D1993 |
| Physical Appearance | Vitreous, transparent/translucent spherical beads | 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 |
| Single Bead Crush Strength | ≥ 120 N | Digital Hardness Tester |
| Spherical Bead Integrity | ≥ 98% intact spheres | Mechanical Sieve / Visual |
| Loss on Drying (LOD @ 150°C) | ≤ 2.0% (Packaged Condition) | DIN 55473 |
| pH Value (10% Aqueous Sol.) | 5.5 – 7.5 (Neutral) | Potentiometric Method |
| Specific Electrical Resistance | ≥ 4000 Ω · cm | IS 3401 |
| Attrition & Friability Loss | < 0.05% | Mechanical Tumble Test |
| Heavy Metals (Pb, Cd, Hg, As) | < 10 ppm | ICP-OES Analysis |
| Dimethyl Fumarate (DMF) | ND (Not Detected) (< 0.1 mg/kg) | GC-MS Testing (EU REACH) |
2. Moisture Adsorption Capacity (Static Equilibrium at 25°C)
| Relative Humidity (% RH) | Guaranteed Minimum Uptake (by Weight) | Typical Performance Range |
|---|---|---|
| 20% RH | ≥ 10.5% | 11.0% – 12.5% |
| 50% RH | ≥ 25.0% | 26.0% – 28.5% |
| 90% RH | ≥ 36.0% | 36.5% – 38.5% |
3. Standard Bead Sieve Fractions
| Sieve Fraction | US Mesh Equivalent | Primary Operational Use Case |
|---|---|---|
| 1.0 – 3.0 mm | ~ 6 – 16 Mesh | High surface-to-volume ratio; automated small sachet packaging (0.5g to 10g), narrow breathers, and inline filter cartridges. |
| 2.0 – 4.0 mm / 2.0 – 5.0 mm | ~ 4 – 10 Mesh | General industrial desiccant grade; balanced adsorption kinetics with low pressure drop for standard air drying towers, breathers, and static storage. |
| 3.0 – 5.0 mm | ~ 4 – 6 Mesh | Maximum mechanical crush strength and lowest backpressure; engineered for twin-tower dynamic air dryers, natural gas drying, and blast dehumidification. |
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