magnetic particles embedded in SiO2 , Base: SIO2, Surface Group: -COOH, particle size: 4-5 μm, unit: 10 mg/ml , 7631-86-9

Synonym(s):
Silica;Silicon dioxide;Silica gel;Quartz;SBA-15

CAS NO.：7631-86-9

Empirical Formula: O2Si

Molecular Weight: 60.08

MDL number: MFCD00148343

EINECS: 231-545-4

PRODUCT Properties

• Melting point: >1600 °C(lit.)
• Boiling point: >100 °C(lit.)
• Density: 2.2-2.6 g/mL at 25 °C
• vapor pressure: 13.3hPa at 1732℃
• refractive index: 1.46
• Flash point: 2230°C
• storage temp.: 2-8°C
• solubility: Practically insoluble in water and in mineral acids except hydrofluoric acid. It dissolves in hot solutions of alkali hydroxides.
• pka: 6.65-9.8[at 20 ℃]
• form: suspension
• Specific Gravity: 2.2
• color: White to yellow
• PH: 5-8 (100g/l, H2O, 20℃)(slurry)
• Odor: at 100.00?%. odorless
• Resistivity: 1∞10*20 (ρ/μΩ.cm)
• Water Solubility: insoluble
• Sensitive: Hygroscopic
• Hydrolytic Sensitivity: 6: forms irreversible hydrate
• Crystal Structure: Trigonal
• Merck: 14,8493
• Exposure limits: NIOSH: IDLH 3000 mg/m3; TWA 6 mg/m3
• Stability: Stable.

Description and Uses

manufacture of glass, water glass, refractories, abrasives, ceramics, enamels; decolorizing and purifying oils, petroleum products, etc.; in scouring- and grinding-compounds, ferrosilicon, molds for castings; as anticaking and defoaming agent.

Safety

• Symbol(GHS): GHS07
• Signal word: Warning
• Hazard statements: H317-H412
• Precautionary statements: P261-P272-P273-P280-P302+P352-P333+P313
• Hazard Codes: Xn,Xi
• Risk Statements: 36/37/38-36/37-22-43-52/53-36/38
• Safety Statements: 26-37/39-36-36/37/39-36/37-61
• OEB: B
• OEL: TWA: 6 mg/m3
• HS Code: 2811221000
• Toxicity: LC inhalation in rat: > 200gm/m3/1H
• IDLA: 3,000 mg/m3