SILICA FUME is a beneficial super pozzolonic mineral additive for cement based materials like cementitious products. Silica fume originates from the production of silicon metal and ferro-silicon alloys. The material consists of amorphous, spherical particles with bulk density of 200-300 kg/m3, and in the form of un- densified Silica Fume and the material is then produced as densified silica fume. Silica Fume is manufactured with stringent and environmental control and it meets the mandatory requirement of the international standards.
Product Identifier: Silica Fume
Synonyms/Trade Names: Amorphous Silica Fume; Condensed Silica Fume.
Manufacturer: Shanghai Topken Silica Fume Co., Ltd.
CAS registry #
Silicon Dioxide (SiO2) amorphous
Aluminum Oxide (AI2O3
Calcium Oxide (CaO)
Iron Oxide (Fe2O3)
Magnesium Oxide (MgO)
Sodium Oxide (Na2O)
Potassium Oxide (K2O)
Silicon Dioxide (SiO2) Crystalline
Silica Fume is of low toxicity. Handling of Silica Fume does not represent a health risk when usual safety rules are observed. Silica Fume is generally considered to be a nuisance dust. High dust concentration may cause irritation. Silica Fume is unlikely to cause harmful effect when handled and stored as advised. Silica Fume may contain trace amounts (<0.5%) of crystalline silica which has been shown to cause silicosis, and has been identified by IARC and NTP as a possible human carcinogen.
INHALATION: Removed exposed person from dusty area to fresh air.
SKIN CONTACT: Wash skin with water and/ or a mild detergent. Moisturizing cream or lotion may be applied to avoid skin dryness.
EYE CONTACT: Flush with water/ saline solution to ensure no particles remain in eye. See a physician on persistent feeling of discomfort.
INGESTION: Not applicable
Silica Fume is not combustible and the dust presents no danger of explosion.
Extinguishing media: Not applicable (if involve in fire: cool with water).
Contain spills or leaks. Transfer spilled material into an appropriate container. Collect spilled material using a vacuum cleaner or wash down with water. Do not use compressed air to maneuver dried material. Avoid generation of airborne dust.
HANDLING: Avoid handling that generates airborne dust.
STORAGE: Store in closed containers. Store away from hydrofluoric acid and fluorides.
Eye protection, eye flushing facilities and protective gloves are recommended. Ensure adequate ventilation. Wear an appropriate particulate respirator in accordance with 29 CFR 1910.134 or CSA Standard Z94.4 M1982 for dust exposure that may exceed exposure limits. If adequate ventilation is not possible, a self-contained breathing apparatus or an air supplied respirator is recommended.
OCCUPATIONAL EXPOSURE LIMITS (OSHA and ACGIH) 8hr TWA mg/m3
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Total inhale dust
Silicon Dioxide, Amorphous
Silicon Dioxide, Crystalline
Physical State: Ultrafine amorphous powder (respirable dust), Dust forms agglomerates
Color: Light dark to gray
Solubility (Water): Insoluble to slightly soluble.
Melting Point (oC): Approx. 1230
Solubility (Organic solvents) Insoluble to slightly soluble.
Specific Gravity (water=1) 2.2-2.3
Bulk density (kg/m3) approx. 400-700
Particle size (µm) Approx 0.3
STABILITY: Silica Fume is stable and does not react with water.
MATERIALS TO AVOID: Avoid contact with hydrofluoric acid and fluorides.
HAZARDOUS REACTIONS: Silica Fume reacts with hydrofluoric acid (HF) forming (SiF4).
Prolonged heating above 500oC (930oF) will convert amorphous silica to the crystalline phases.
INGESTION: Dust from Silica Fume may irritate and dehydrate mucous, membranes.
INHALATION: Dust from Silica Fume may irritate and dehydrate mucous, membranes.
SKIN CONTACT: Dust from Silica Fume may cause irritation and dehydration.
EYE CONTACT: Dust from Silica Fume may cause irritation and dehydration.
Silica Fume dust may contain impurities of crystalline quartz (<0.5%). Inhalation of Silica Fume dust is considered to entail risk of pulmonary fibrosis (silicosis).
Cases of lung fibrosis have been reported among workers exposed to amorphous silica in the ferrosilicon industry. The lung changes have either been transient or may have been caused by simultaneous exposure to crystalline silica (quartz). Heating Silica Fume above 500oC can result in the formation of crystalline SiO2- modification (Cristobalite /Tridymite) which may cause silicosis.
The formation rate increases with increasing temperature. Periodic health examinations of persons exposed to the dust are recommended to include: pulmonary examination, spirometry and possible x-ray.
Silica Fume is not characterized as dangerous for the environment.
Reuse all product when possible. Dispose of waste Silica Fume according to applicable federal, state and local rules for non-hazardous solid waste materials. No special precautions are necessary during repacking. Silica Fume is not a listed RCRA Hazardous Waste (40CFR 261).
DOT (DEPARTMENT OF TRANSPORTATION)
Proper Shipping Name: Not regulated
Hazard Class: Not regulated
I.D. Number and Initials: Not regulated
Packing Group: Not regulated
Label(s): Not regulated
OSHA- Hazardous by definition of hazardous communication standard (29CFR 1910.1200).
TSCA (Toxic Substance Control Act): Components of this product are listed on the TSCA Inventory
CERCLA (Comprehensive Response Compensation, and Liability Act): Silica Fume is not listed in 40 CFR 302.4
RCRA (Resource Conservation/ Recovery Act): Silica Fume is not a listed hazardous waste.
SARA TITLE III (Superfund Amendments and Reauthorization Act): Immediate Health, Delayed Health.
313 Reportable Ingredients: None.
CALOFORNIA PROPOSITION 65: This product contains chemical(s) known to the State of California to cause cancer:
APPLICATION OF SILICA FUME: For use in refractory compositions, concrete and other systems containing hydraulic cement. Literature references are available upon request from the manufacturer. TOPKEN ® is a registered trademark owned by Shanghai Topken Silica Fume Co., Ltd. The information presented in this material safety data sheet relates to this specific material. It may not be valid for this material if used in combination with any other materials or in any process. It is the user’s responsibility to verify the suitability and completeness of this information for the particular use intended.