Description

Metakaolin is a high-reactivity, amorphous aluminosilicate pozzolan produced by the controlled thermal dehydroxylation of kaolin clay. This process yields a material with significant value in enhancing the performance and durability of cementitious systems. It is a critical component for industries seeking to improve concrete strength, reduce permeability, and mitigate deleterious alkali-silica reactions. Key sectors that utilize this advanced mineral admixture include construction, specialty ceramics, and polymer composites.

Application

• High-Performance Concrete: As a supplementary cementitious material (SCM) to increase compressive and flexural strength, reduce chloride ion penetration, and enhance durability.
• Repair Mortars and Grouts: To improve early strength development, bonding, and chemical resistance in specialized repair formulations.
• Geopolymer Cement Production: Serving as a primary aluminosilicate source precursor for creating low-CO₂ alternative binders.
• Fiber Cement Boards: To improve dimensional stability, reduce weight, and increase the resistance to weathering and mold.
• Ceramic Glazes and Bodies: As a source of reactive alumina and silica to modify firing characteristics and improve mechanical properties.
• Polymer Composites: Acting as a functional filler to enhance mechanical strength, thermal stability, and flame retardancy in plastics and coatings.
• Oilwell Cementing: Used in slurry designs to prevent strength retrogression under high-temperature, high-pressure (HTHP) downhole conditions.

Basic Information

Product Name	Metakaolin
CAS No.	15123-81-6
Molecular Formula	Al2Si2O7
Molecular Weight	222.13 g/mol
Synonyms	Calcined Kaolin; Dehydroxylated Kaolin; Meta-Kaolin; MK; Pozzolanic Metakaolin; Thermally Activated Kaolin; Aluminosilicate Pozzolan; AS2 (Cement Chemistry Notation)
EINECS	239-155-5

Quality Control

Our Metakaolin is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance reliability. Key parameters such as loss on ignition (LOI), specific surface area (BET), and pozzolanic activity index are rigorously tested. Certificates of Analysis (COA) documenting physical and chemical specifications are provided with every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. This material is hygroscopic (moisture-sensitive) and must be stored in a cool, dry, and well-ventilated area. Keep the container tightly sealed when not in use to prevent moisture absorption and caking. Recommended storage temperature is between 15°C and 25°C.

Specification

Item	Specification
Appearance	Fine, white to off-white powder
Loss on Ignition (LOI)	≤ 1.5 %
Specific Surface Area (BET)	15 - 25 m²/g
Particle Size (D50)	1 - 3 µm
SiO2 Content	51 - 55 %
Al2O3 Content	41 - 45 %
Fe2O3 Content	≤ 1.5 %
Pozzolanic Activity Index (7-day)	≥ 110 %

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