Fly ash is a fine residue resulting from the burning of powdered coal at high temperatures. The most common sources of Fly Ash are electric power generating stations. Fly Ash has become the predominant pozzolan in use throughout the world due to performance and economic factors. The main content of Fly Ash is silica. There are 2 types of Fly Ash Class F and Class C. The types are differentiated base on the sum of Silicon Dioxide (Sio2) + Aluminum Oxide (AI2O3) + Iron Oxide (Fe2O3). If the sum of this is greater than or equal to 70% it is called Class F Fly Ash and if the percentage is greater than or equal to 50% it is called Class C Fly Ash. Economic Benefits: It replaces Portland cement up to 20 to 50%.
Technical Benefits on Fresh Concrete:
Technical Benefits on Hardened Concrete:
Identify : Fly Ash, Class F, ASTM C 618 / BS 3892
Country of Origin : India
Percent by Weight
Silicon Dioxide (SiO2)
Aluminum Oxide (Al2O3)
Iron Oxide (Fe2O3)
Titanium Oxide (TiO2)
Calcium Oxide (CaO)
Potassium Hydroxide (KOH)
Sulfur Trioxide (SO3)
Potential Health Effects: Potential health effects may vary depending upon the duration and degree of exposure. To reduce or eliminate health hazards associated with this product, use exposure control personal protection methods as described in Section 12.
Eye Contact: (Acute/ Chronic) Exposure to airborne dust may cause immediate or delayed irritation inflammation of the cornea.
Inhalation: (Acute) Breathing dust may cause nose, throat or lung irritation.
Ingestion: Do not ingest Ash. Although ingestion of small quantities of ash is not known to be harmful, large quantities can cause distress to the digestive tract.
Inhalation (Chronic): Risk of injury depends on duration and level of exposure.
Silicosis: This product contains crystalline silica. Prolonged or repeated inhalation of respirable crystalline silica from this product can cause silicosis, a seriously disabling and fatal lung disease.
Carcinogenicity: Ash is not listed as a carcinogen by IARC, however, ash contains trace amounts of crystalline silica, which is classified as a known human carcinogen.
H.M.I.S ratings: Health -1 Flammability – 0 Reactivity – 0
Eyes: Immediately flush eye thoroughly with water. Get medical attention if irritation persists.
Skin: Wash with cool water and mild skin detergent. Seek medical attention for rashes or irritation.
Inhalation: Remove person to fresh air. If breathing is difficult, administer oxygen. If not breathing give artificial respiration. Seek medical help if coughing and other symptoms do not subside.
Ingestion: Do not induce vomiting. If conscious, have the victim drink plenty of water and call a physician if discomfort is experience.
Use clean- up methods that do not disperse dust into air. Avoid inhalation of dust and contact with eyes. Use exposure control and personal protection methods as described in Section 12.
Specific Gravity (II20=1.0)
2.0 - 2.9
Gray / black or brown/ tan powder
Ph (in water)
Auto Ignition Temperature
Hazardous Combustion Products
Lower Explosive Limit
Upper Explosive Limit
Special Fire Fighting Procedure
Unusual Fire Explosion Hazards
Product is stable
Incompatibility (Materials to Avoid)
Acids, ammonium salts and aluminum metal
Will not Occur
Will not occur
Handle and store in a manner so that airborne dust does not exceed applicable exposure limits. Use adequate ventilation and dust collection. Use exposure control and personal protection methods as described in Section 12.
Conditions aggravated by exposure: Eye disease, Skin disorders and Chronic conditions.
Respiratory Protection: Use local exhaust or general dilution to control dust levels below applicable exposure limits. Minimize of dust into the air. Use appropriate NIOSH approved respiratory protection for respirable crystalline silica.
Eye Protection: Wear safety glasses with side shields or goggles to avoid contact with eyes. In extremely dusty environments and unpredictable environments, wear tight- fitting unvented or indirectly vented goggles to avoid eye irritation or injury.
Skin Protection: Wear gloves, boot covers and protective clothing impervious to water to prevent skin contact.
All disposal methods must be in accordance with all Federal/ Provincial and local laws and regulations. Regulations may vary in different locations. Waste characterization and compliance with applicable laws are the responsibility solely of the waste generator.
This product is not classified as hazardous under DOT or TDG regulations.
Status Under US OSHA Hazard Communication Rule 29 CFR 1910.1200: Silica is considered as Hazardous Chemical under this regulation and should be included in the employer’s hazard communication program.
Status under CERCLA / Superfund,40 CFR and 302: NOT LISTED
Hazard Category under SARA (Title111), Section 311 and 312: Silica qualifies as a hazardous substance with delayed health effects.
Status under SARA (Title111), Section 313: Not subjecting to reporting requirements under section 313.
The information and recommendation contained herein are based upon data believed to be correct. However, no guarantee or warranty of any kind, express or implied, is made with respect to the information contained herein. It is the user’s obligation to determine the conditions of safe use of this product.