Hydrophobic Fumed Silica HB-612


Specific Surface Area(BET) ㎡/g 140±20 GB/T 20020
pH value in 4% dispersion     (H2O:Ethanol=1:1)  – 5.0~8.0 GB/T 20020
Loss on drying(2 hours at 105℃) % ≤0.7 GB/T 20020
Loss on ignition(2 hours at 1000℃ based on material dried for 2 hours at 105℃) % ≤2.0 GB/T 20020
Silica Content(Based on ignited material) % ≥99.8 GB/T 20020
Tamped Density(Based on material dried at 105℃ for 2 hours) g/dm³ 40~60 GB/T 20020
Carbon Content (Based on material dried at 105℃ for 2 hours) % 0.7~1.3 GB/T 20020


Packing& Storage

Packing In 10KG bag.
Storage Store in a cool,dry and ventilated place. Keep the container airtight.
Shipping no dangerous goods


General Information

1.1 Chemical & Physical Properties

Common Names Hydrophobic Fumed silica HB-612
CAS No. 112945-52-5 Boiling Point (℃) 2230ºC
Molecular Weight 60.0843 Melting Point (℃)  >1600°C
Appearance white  powder Flash Point  N/A


1.2 Safety Information

RIDADR NONH for all modes of transport
WGK Germany 2


Inhalation May cause respiratory irritation Wear mask Please move the patient to fresh air. If breathing stops, give artificial respiration.
Skin May cause skin irritation Wear gloves Rinse with soap and plenty of water
Eyes May cause eye irritation Wear protective glasses Rinse eyes with water
Ingestion N/A N/A Do not orally feed anything to an unconscious person. Gargle with water


Frequently Asked Questions

What is Hydrophobic Fumed silica HB-612?

HB-612 is a kind of hydrophobic fumed silica of HL-150 after treatment with HMDS (Hexamethyldisilazane).


What is Hydrophobic Fumed silica HB-612 used for?

RTV silicone sealants,especially electronic potting and Liquid glue

Adhesives and Sealants

Coatings & Printing ink

Powder Coatings