Description

Fly Ash CAS NO 329065-12-5 is a fine, powdery by-product generated from the combustion of pulverized coal in thermal power plants. This material is a critical supplementary cementitious material (SCM) valued for its pozzolanic properties, which enhance the durability, workability, and long-term strength of concrete while reducing its environmental footprint. It is an essential raw material for the construction, infrastructure, and building materials industries, where it is used to produce high-performance, sustainable concrete and cement-based products.

Application

• Concrete Production: As a partial replacement for Portland cement to improve workability, reduce heat of hydration, and increase long-term compressive strength and sulfate resistance.
• Cement Manufacturing: As a key component in the production of Portland Pozzolana Cement (PPC) and blended cements.
• Geotechnical Engineering: For soil stabilization, embankment construction, and as a fill material in road base and sub-base applications.
• Precast Concrete Products: Used in the manufacture of blocks, pipes, pavers, and other precast elements to enhance durability and surface finish.
• Grouts and Mortars: Incorporated into specialized mixes for improved flow, reduced shrinkage, and enhanced chemical resistance.
• Waste Stabilization: Utilized in the solidification and stabilization of industrial wastes and flue gas desulfurization sludges.
• Mine Backfill: Acts as a component in paste backfill for underground mining operations.
• Agricultural Amendment: Used to modify soil pH and improve soil texture in certain agricultural applications.

Basic Information

Product Name	Fly Ash
CAS No.	329065-12-5
Molecular Formula	Complex silicate/aluminosilicate mixture
Molecular Weight	N/A (Variable composition)
Synonyms	Pulverized Fuel Ash (PFA); Coal Ash; Flue Ash; Cenospheres (for certain fractions); Pozzolan; ASTM C618 Class F Fly Ash; ASTM C618 Class C Fly Ash; Coal Combustion Product (CCP); Coal Fly Ash (CFA)
EINECS	Contact for details

Quality Control

Our Fly Ash is sourced and processed to meet stringent industry standards, including ASTM C618 and EN 450-1. Quality is assured through rigorous batch testing for key parameters such as fineness, loss on ignition, chemical composition, and pozzolanic activity index. Certificates of Analysis (COA) confirming compliance with specified grade requirements are available upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area. The product is hygroscopic (moisture-sensitive) and must be kept dry to prevent caking and maintain flowability. Bulk storage silos should be properly sealed to minimize moisture ingress.

Specification

Item	Specification
Appearance	Fine gray powder
Fineness (Retained on 45µm sieve)	≤ 34%
Loss on Ignition (LOI)	≤ 6.0%
Silicon Dioxide (SiO₂) + Aluminum Oxide (Al₂O₃) + Iron Oxide (Fe₂O₃), min	70.0%
Sulfur Trioxide (SO₃), max	5.0%
Moisture Content, max	3.0%
Available Alkalis as Na₂O, max	1.5%
Pozzolanic Activity Index (7-day), min	75% of control
Pozzolanic Activity Index (28-day), min	75% of control
Water Requirement, max	105% of control
Soundness (Autoclave Expansion), max	0.8%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.