Basic information of silicon dioxide (7631-86-9)
1. Chemical name: Silicon dioxide
2. Chinese aliases: silica; white carbon black; nano-silica; silicon anhydride; quartz sand (depending on specific form)
3. English name: Silicon Dioxide
4. Molecular formula: SiO₂
5. Molecular weight: 60.08
6. CAS number: 7631-86-9
7. EINECS Number: 231-545-4
8. Appearance: Depending on the product type, it can be white powder, granules, or amorphous gel, commonly found in fine granular or colloidal form
Technical Parameters
Feed additive - silicon dioxide
project
indicator
granularity
All passed through a 20-mesh analysis sieve
Silica content (after ignition), % ≥
ninety-six
Loss on heating, % ≤
eight
Loss on ignition (on a dry basis), %
seven
pH value (10% aqueous solution)
5.5～7.5
Soluble dissociated salt (calculated as Na₂SO₄), %
three
Arsenic (As), mg/kg
three
Lead (Pb), mg/kg
five
Silicon dioxide, an additive for silicone rubber
project
indicator
Appearance
white powder
white powder
white powder
Nitrogen adsorption specific surface area BET, m²/g
130-160
160-190
190-220
Silica content, %
≥99
≥99
≥99
Particle size (D50), μm
8-15
8-15
8-15
Loss on heating at 105℃ for 2 hours, %
4.0-8.0
4.0-80
4.0-8.0
Loss on ignition of dry agent at 1000℃ for 2 hours, %
≤6.0
≤6.0
≤6.0
pH value
6.0-7.5
6.0-7.5
6.0-7.5
Conductivity, us/cm
≤300
≤200
≤150
DBP absorption value, cm³/g
2.0-3.0
2.0-3.0
2.0-3.0
≤200
≤150
≤150
Precipitated silica
project
indicator
Silica content, %
≥96
Loss on heating, %
3.0～6.0
Loss on ignition, %
4.0～6.0
pH aqueous suspension
6.0～9.0
BET specific surface area, m²/g
45～200
DBP oil absorption value, ml/100g
150～300
Salt content, %
≤3.5
Impact density, g/1
≤320
residue on sieve
3 2 5 mesh sieve (powder), %
≤5.0
50 mesh sieve (granulation), %
≥85
project
Gas phase silica dioxide
Nitrogen adsorption specific surface area (m²/g)
200～230
280～330
375～435
±30
pH value of suspension
4.10～4.30
4.10～4.30
4.10～4.30
4.10～4.30
mechanical impurities
Total quantity (pieces) ≤
ten
seven
seven
seven
"团状物及絮状物 ≤"
0
0
0
0
Mass fraction of volatile matter at 105℃/% ≤
zero point eight zero
one point five
one point five
one point five
Chloride mass fraction (mg/kg) ≤
thirty-five
fifty
fifty
fifty
Aluminum mass fraction (mg/kg) ≤
twenty
twenty
twenty
twenty
Iron mass fraction / (mg/kg) ≤
ten
twenty
twenty
twenty
Titanium mass fraction (mg/kg) ≤
ten
Loss on ignition/% ≤
two point five
Tap density (g/dm³)
30～60
45μm sieve residue (mg/kg) ≤
two hundred and fifty
Surface silicon hydroxyl groups (number/nm²)
/
Oil absorption value (mL/g)
/
Silicon dioxide content/%
ninety-nine point eight zero
Carbon content /%
zero point two zero
(The above parameters are reference values, and the specific values shall be subject to the factory inspection sheet.)
Note: Products can be categorized into electronic-grade silica micro-powder, feed additive silica, aquatic product silica, silicone rubber additive silica, precipitated silica, fumed silica, colloidal silica, etc., depending on their applications. For specific specifications, please feel free to inquire!
III. Packaging specifications
1. 10kg, 15kg, 20kg paper bags or composite woven bags lined with PE bags
2. 500kg or 1000kg ton bag
3. Customized packaging specifications can be provided according to customer needs