Description

Chalk CAS NO 13397-25-6 is a naturally occurring, fine white powder composed primarily of calcium carbonate. It serves as a versatile and cost-effective functional filler and pigment across numerous industries. Key industrial users include manufacturers of paints, coatings, plastics, rubber, paper, and construction materials who require a reliable source of high-purity calcium carbonate to enhance product properties and optimize production costs.

Application

• Paints & Coatings: Acts as an extender pigment and filler to improve whiteness, opacity, and rheological properties while reducing formulation costs.
• Plastics & Polymers: Used as a functional filler to increase rigidity, thermal stability, and impact resistance in products like PVC pipes, profiles, and films.
• Paper Manufacturing: Employed as a coating and filler to enhance paper brightness, opacity, smoothness, and printability.
• Rubber Industry: Serves as a reinforcing agent to improve tensile strength, abrasion resistance, and dimensional stability in rubber products.
• Construction Materials: A key component in sealants, adhesives, joint compounds, and as a filler in concrete and asphalt mixtures.
• Personal Care & Cosmetics: Used as a gentle abrasive, bulking agent, and opacifying agent in products like toothpaste, face powders, and creams.
• Agriculture: Applied as a soil conditioner to neutralize acidic soils and provide a source of calcium for plant nutrition.
• Food & Pharmaceutical (Food/Pharma Grade): Functions as a calcium supplement, antacid, colorant, or processing aid where high-purity grades are specified.

Basic Information

Product Name	Chalk
CAS No.	13397-25-6
Molecular Formula	CaCO3
Molecular Weight	100.09 g/mol
Synonyms	Calcium Carbonate; Precipitated Calcium Carbonate (PCC); Ground Calcium Carbonate (GCC); Limestone; Calcite; Aragonite; Whiting; Carbonate of Lime; CI 77220; CI Pigment White 18
EINECS	207-439-9

Quality Control

Our Chalk (Calcium Carbonate) is produced and tested under a stringent quality management system. We offer various grades, including Industrial, Food (FCC), and Pharmaceutical (USP/EP) specifications, each with defined parameters for purity, particle size distribution, brightness, and heavy metal content. A Certificate of Analysis (COA) is provided with every shipment to guarantee batch-to-batch consistency and compliance with your requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials such as strong acids. The product is hygroscopic (moisture-sensitive); ensure containers are sealed after use to prevent caking.

Specification

Item	Specification
Appearance	White to off-white fine powder
Identification (IR)	Conforms
Assay (as CaCO3)	≥ 98.0 %
Loss on Drying	≤ 2.0 %
Acid Insoluble Matter	≤ 0.2 %
Heavy Metals (as Pb)	≤ 10 ppm
Arsenic (As)	≤ 3 ppm
Particle Size (D50)	Contact for details
Brightness	Contact for details

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