Description

Feldspar CAS NO 68476-25-5 is a group of rock-forming tectosilicate minerals that constitute one of the most abundant mineral groups in the Earth's crust. This material is critically important as a primary source of alumina (Al₂O₃) and alkalis (Na₂O, K₂O) for industrial processes, offering key fluxing and strengthening properties. It is essential for manufacturers in the ceramics, glassmaking, and filler industries seeking consistent quality and reliable supply for their production lines.

Application

• Ceramics & Sanitaryware: Acts as a vital flux to lower the vitrification temperature, reducing energy consumption and enhancing the strength and durability of tiles, tableware, and bathroom fixtures.
• Glass Manufacturing: Serves as a fundamental source of alumina, which improves the chemical durability, hardness, and resistance to thermal shock in container, flat, and fiberglass.
• Paints & Coatings: Used as an extender and filler to improve film durability, weather resistance, and sheen control while reducing formulation costs.
• Plastics & Polymers: Functions as an inert filler to improve dimensional stability, increase hardness, and reduce resin consumption in composite materials.
• Abrasive & Welding Electrodes: Employed in bonded abrasives and welding rod coatings for its fluxing properties and ability to form a protective slag layer.
• Construction Materials: Incorporated into cement and asphalt mixtures to enhance specific properties and act as a cost-effective mineral additive.

Basic Information

Product Name	Feldspar
CAS No.	68476-25-5
Molecular Formula	Complex silicate (e.g., KAlSi₃O₈, NaAlSi₃O₈, CaAl₂Si₂O₈)
Molecular Weight	Varies by composition
Synonyms	Alkali Feldspar; Potassium Feldspar (K-Feldspar, Orthoclase, Microcline); Sodium Feldspar (Albite); Calcium Feldspar (Anorthite); Plagioclase; China Stone; Cornish Stone; Feldspathic Flux; CAS 68476-25-5
EINECS	270-666-1

Quality Control

Our Feldspar is sourced and processed under strict quality protocols to ensure batch-to-batch consistency for industrial applications. Quality is verified against key parameters including chemical composition (K₂O, Na₂O, Al₂O₃, Fe₂O₃ content), particle size distribution, and whiteness index. Certificates of Analysis (COA) detailing these specifications are available for every shipment to support your quality assurance and production planning.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep the container sealed when not in use to prevent moisture absorption and contamination from other materials.

Specification

Item	Specification
Appearance	White to off-white powder
Alumina (Al₂O₃)	≥ 18.0 %
Potassium Oxide (K₂O)	≥ 10.0 % (Potash Grade)
Sodium Oxide (Na₂O)	≥ 7.0 % (Soda Grade)
Iron Oxide (Fe₂O₃)	≤ 0.1 %
Particle Size (-200 mesh / 74 µm)	≥ 95 %
Loss on Ignition (LOI)	≤ 0.5 %

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