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Calcined Kaolin
Calcined Kaolin is a fine, white to off-white powder produced by heating natural kaolin clay to high temperatures (typically between 600°C and 900°C) in a controlled process called calcination. This thermal treatment removes chemically bound water, changes the crystalline structure, and enhances the physical and chemical properties of kaolin. The resulting product exhibits increased brightness, hardness, and opacity, making it highly valuable as a functional additive and filler in numerous industrial applications. Calcined Kaolin is widely used in coatings, ceramics, plastics, rubber, paper, and paint industries to improve durability, brightness, and performance.
Description
Calcined Kaolin Uses
Primary Uses
- Coatings & Paints
- Used as a functional extender to improve paint durability, brightness, and opacity.
- Enhances scratch resistance, corrosion resistance, and weatherability of coatings.
- Acts as a matting agent and improves the rheology (flow properties) of paint formulations.
- Paper Industry
- Serves as a filler and coating pigment to improve paper brightness, smoothness, and printability.
- Enhances paper opacity and bulk, providing better surface gloss and ink holdout.
- Ceramics
- Used in ceramic formulations to improve strength, whiteness, and thermal stability.
- Reduces firing temperature and improves product uniformity.
- Plastics & Rubber
- Acts as a reinforcing filler in plastics and rubber compounds, enhancing mechanical strength and resistance to abrasion.
- Improves dimensional stability and surface finish of molded products.
- Construction Materials
- Incorporated in cement, plaster, and concrete to improve hardness, reduce permeability, and increase resistance to chemical attack.
Secondary Uses
- Cosmetics & Personal Care
- Used as an absorbent and mattifying agent in powders and makeup products.
- Adhesives & Sealants
- Functions as a rheology modifier and extender to improve performance characteristics.
- Agriculture
- Occasionally used as an inert carrier or anti-caking agent in fertilizers and pesticides.
KEY ATTRIBUTES
1. Basic Identification Attributes
- Chemical Name (IUPAC): Aluminum silicate hydroxide (dehydroxylated form after calcination)
- Common/Trade Names: Calcined Kaolin, Metakaolin, Thermally Treated Kaolin
- CAS Number: 1318-74-7 (kaolin base)
- HS Code: 2507.00.00
- Molecular Formula: Approx. Al2Si2O7 (dehydroxylated kaolin)
- Synonyms:
- Metakaolin
- Calcined Clay
- Thermally Activated Kaolin
2. Physical & Chemical Properties
- Physical State: Fine powder
- Color & Odor: White to off-white; odorless
- Melting Point: Not applicable (inorganic mineral)
- Boiling Point: Not applicable
- Density: Approx. 2.6–2.8 g/cm³
- Solubility: Insoluble in water and organic solvents
- pH: Neutral to slightly alkaline (6–8) in aqueous suspension
- Stability: Chemically stable; non-hygroscopic
3. Safety & Hazard Attributes
- Hazard Class (GHS): Not classified as hazardous under normal handling
- NFPA Ratings:
- Health: 1
- Flammability: 0
- Reactivity: 0
- Exposure Limits: OSHA PEL for nuisance dust: 15 mg/m³ (total dust), 5 mg/m³ (respirable dust)
- Toxicity: Low toxicity; inhalation of fine dust may cause mild respiratory irritation
- Reactivity: Stable; inert under normal conditions
4. Storage & Handling Attributes
- Storage Conditions: Store in dry, cool areas away from moisture and contaminants
- Container Type: Bulk bags, drums, or silos depending on quantity
- Shelf Life: Indefinite if stored properly
- Special Handling: Minimize dust generation; use PPE (masks, goggles, gloves) during handling
5. Regulatory & Compliance Attributes
- FDA Status: Generally Recognized As Safe (GRAS) as an indirect food contact substance (in some grades)
- Pharmacopoeia Compliance: Not typically listed in pharmacopeias
- Transportation: Not regulated as hazardous material
- Waste Disposal: Dispose of according to local regulations; inert waste
6. Environmental & Health Impact
- Ecotoxicity: Low environmental hazard; inert mineral
- Persistence: Non-biodegradable but environmentally inert
- Bioaccumulation: Not expected to bioaccumulate
- Carcinogenicity/Mutagenicity: Not classified as carcinogenic; some respirable dust forms of kaolin are considered nuisance dust
- Biodegradability: Not biodegradable
SAFETY HANDLING PRECAUTIONS
Safety Handling Precautions
Personal Protective Equipment (PPE):
- Dust mask or respirator (NIOSH-approved)
- Gloves
- Protective goggles
- Protective clothing
Handling Measures:
- Avoid inhalation of dust
- Use local exhaust ventilation or dust extraction systems
- Handle in well-ventilated areas
Storage Measures:
- Keep containers tightly closed
- Store in dry conditions to prevent caking
Hygiene Practices:
- Wash hands and exposed skin after handling
- Do not eat, drink, or smoke while handling
First Aid Measures
- Inhalation: Move to fresh air; seek medical attention if coughing or breathing difficulty occurs
- Skin Contact: Wash with soap and water; seek medical advice if irritation develops
- Eye Contact: Rinse thoroughly with water for at least 15 minutes; seek medical attention if irritation persists
- Ingestion: Rinse mouth; no significant toxicity expected; seek medical advice if large amounts ingested
Firefighting Measures
- Fire Hazards: Non-flammable
- Extinguishing Media: Use extinguishing media appropriate for surrounding fire (water, foam, dry chemical)
- Special Precautions: Use protective equipment to avoid dust inhalation during fire conditions
- Decomposition Products: None under normal fire conditions
Related products
Aluminium Silicate
Aluminium silicate is an inorganic compound composed of aluminum, silicon, and oxygen, often found naturally as a major component of clay minerals such as kaolinite, halloysite, and other aluminosilicates. It is a white to off-white powder with excellent thermal stability, chemical inertness, and physical durability. Due to its wide range of physicochemical properties—including high melting point, non-toxicity, and adsorptive capabilities—aluminium silicate is extensively used across diverse industries including ceramics, paints, paper, rubber, plastics, cosmetics, and pharmaceuticals. Its unique structure imparts benefits such as heat resistance, improved mechanical strength, and anti-caking properties, making it a vital raw material in both industrial and consumer products.
Aluminum Fine Powder
Aluminum fine powder consists of finely divided aluminum particles, typically metallic and silvery-white in appearance. It is produced by atomization or grinding of bulk aluminum and is valued for its high surface area, excellent conductivity, and lightweight metallic properties. Aluminum fine powder is extensively used in various industrial applications including metallurgy, pyrotechnics, coatings, additive manufacturing, and as a pigment. Due to its reactivity, it requires careful handling and storage. Its fine particulate nature makes it particularly useful where rapid oxidation or reaction is desired, such as in explosives or energetic materials. It is also employed in the manufacturing of paints, inks, and cosmetics to impart metallic luster.
Aluminum hydroxide
Aluminum Hydroxide, chemically known as Al(OH)₃, is a white, odorless, and odorless powder or gelatinous substance. It is widely used in pharmaceuticals as an antacid to neutralize stomach acid and relieve indigestion and heartburn. Beyond healthcare, aluminum hydroxide is a crucial component in water purification, fire retardants, and as a precursor or filler in various industrial applications. It functions as a flame retardant by releasing water upon heating, thus cooling the material and diluting flammable gases. Due to its amphoteric nature, it can react both as an acid and base, enhancing its versatility. Aluminum hydroxide is often utilized in manufacturing aluminum salts and in producing aluminum oxide.
Binder
A binder is a broad category of substances—organic or inorganic—used to hold different materials together in a cohesive mass. Common binders include natural polymers (starch, cellulose derivatives, proteins), synthetic resins (PVA, acrylics, phenolics), and inorganic binders (clays, cement, lime). They are essential in industries such as pharmaceuticals, construction, coatings, ceramics, adhesives, and printing, where they provide structural integrity, adhesion, and controlled release properties.
Calcium Carbonate Heavy
Calcium Carbonate Heavy is a high-density, finely ground, natural mineral primarily composed of calcium carbonate (CaCO₃). Known for its higher bulk density compared to regular grades, this filler is widely used in applications requiring enhanced weight, opacity, and strength. It is commonly employed as a functional filler and extender in industries such as plastics, paints, coatings, adhesives, rubber, paper, and construction materials. Its inert nature, whiteness, and particle size distribution make it suitable for improving mechanical properties and surface finish, while also offering cost efficiency by replacing more expensive raw materials.
Calcium Carbonate Light
Calcium Carbonate Light is a finely ground, low bulk density natural mineral composed primarily of calcium carbonate (CaCO₃). Compared to standard grades, it has a lower density and larger particle size distribution, making it suitable for applications where light weight and high brightness are important. This form is extensively used as a filler and extender in industries such as plastics, paints, rubber, paper, adhesives, and construction materials to improve opacity, brightness, and texture, while maintaining low weight and cost efficiency. Its chemical inertness and whiteness provide functional and aesthetic advantages across formulations.
Eagle Homopolymer
Eagle Homopolymer is a high-purity homopolymer solution, typically referring to polyvinyl alcohol (PVA) or a similar water-soluble polymer supplied at 50% concentration. This product offers excellent film-forming, adhesive, thickening, and stabilizing properties, making it versatile in applications such as adhesives, textile sizing, paper coating, and packaging. The homopolymer’s controlled molecular weight and solution viscosity provide consistent performance and ease of handling. The 50% aqueous solution form facilitates easy mixing and incorporation into various formulations.
