1.00657

Silicic acid

precipitated extra pure light

• Synonym(s): Silicic acid
• Empirical Formula (Hill Notation): O₂Si · xH₂O
• CAS Number: 10279-57-9
• Molecular Weight: 60.08 (anhydrous basis)
• UNSPSC Code: 12352308
• EC Index Number: 231-545-4
• NACRES: NB.21

Properties

• Quality Level: 200
• assay: 99-100.5% SiO₂ basis (calculated on ignited substance, gravimetric)
• form: solid
• potency: >10000 mg/kg LD₅₀, oral (Rat); >5000 mg/kg LD₅₀, skin (Rabbit)
• loss: ≤8.5% loss on ignition, 2 h, 900 °C
• pH: 3.0-8.0 (3.3% in water)
• mp: 1710 °C
• solubility: water: insoluble at 20 °C
• density: 2-6 g/cm³ at 20 °C
• bulk density: 60‑600 kg/m³
• anion traces: chloride (Cl^-): ≤0.05%; sulfate (SO₄^2-): ≤0.5%
• cation traces: Fe: ≤0.03%; heavy metals (as Pb): ≤0.0025%
• application(s): sample preparation
• storage temp.: no temp limit
• InChI: 1S/O2Si/c1-3-2
• InChI key: VYPSYNLAJGMNEJ-UHFFFAOYSA-N

Description

Analysis Note

Assay (gravimetric, SiO₂, calc. on ignited substance): 99.0 - 100.5 %
Identity: passes test
pH-value (3.3 %, water): 3.0 - 8.0
Chloride (Cl): ≤ 0.05 %
Sulfate (SO₄): ≤ 0.5 %
Heavy metals (as Pb): ≤ 0.0025 %
Fe (Iron): ≤ 0.03 %
Loss on ignition (2 h, 900 °C): ≤ 8.5 %
Particle size (< 0.1 mm): about 99
Bulk density: about 6

Safety Information

• Storage Class: 13 - Non Combustible Solids
• wgk_germany: nwg
• flash_point_f: Not applicable
• flash_point_c: Not applicable