Melting point :>1600°C
Density :2.3 lb/cu.ft at 25 °C (bulk density)(lit.)
refractive index :n20/D 1.46(lit.)
solubility :Practically insoluble in organic solvents, water, and acids, except hydrofluoric acid; soluble in hot solutions of alkali hydroxide. Forms a colloidal dispersion with water. For Aerosil, solubility in water is 150 mg/L at 258℃ (pH 7).
form :powder
Specific Gravity :2.2
Hydrolytic Sensitivity :5: forms reversible hydrate
InChI :InChI=1S/O2Si/c1-3-2
InChIKey :VYPSYNLAJGMNEJ-UHFFFAOYSA-N
SMILES :[Si](=O)=O
CAS DataBase Reference :112945-52-5(CAS DataBase Reference)
EPA Substance Registry System :Silica, amorphous, fumed, cryst.-free (112945-52-5)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362 H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning H350 May cause cancer Carcinogenicity Category 1A, 1B Danger
Precautionary statements:	P264 Wash hands thoroughly after handling. P264 Wash skin thouroughly after handling. P280 Wear protective gloves/protective clothing/eye protection/face protection. P302+P352 IF ON SKIN: wash with plenty of soap and water. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P321 Specific treatment (see … on this label). P332+P313 IF SKIN irritation occurs: Get medical advice/attention. P362 Take off contaminated clothing and wash before reuse.