Description

 

Cristobalite Powder — High-Purity SiO₂ for Industrial Applications

Product Overview

Cristobalite is a high-temperature polymorph of silicon dioxide (SiO₂), known for its exceptional whiteness, hardness, chemical stability, low thermal expansion, and high reflectivity.
Produced through controlled calcination of high-quality quartz sand, cristobalite powder is widely used across multiple industries that require precision, purity, and performance.

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Key Features

• High Purity: SiO₂ content ≥ 98%
• High Whiteness: Excellent brightness for aesthetic and functional applications
• Low Thermal Expansion: Ensures dimensional stability under temperature changes
• High Hardness & Wear Resistance: Improves surface durability
• Excellent Chemical Inertness: Stable against acids and alkalis
• High Reflectivity: Ideal for coatings and optical applications

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Applications by Industry

1. Artificial Stone & Quartz Surfaces

Cristobalite is the main filler in engineered quartz stones, countertops, and decorative surfaces, offering:

• High whiteness and gloss
• Enhanced hardness and scratch resistance
• Stable color and anti-yellowing performance

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2. Paints & Coatings

Used as a functional filler in high-performance coatings, cristobalite provides:

• Improved film hardness and abrasion resistance
• Increased brightness and UV stability
• Reduced thermal expansion for better adhesion

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3. Plastics & Rubber

As a reinforcing filler, cristobalite helps:

• Improve dimensional stability and thermal resistance
• Enhance surface smoothness and mechanical strength
• Maintain color stability under heat and light exposure

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4. Ceramics, Glass & Enamels

Cristobalite contributes to thermal shock resistance and surface brightness, and is commonly used in:

• Ceramic glazes
• High-temperature glass materials
• Enamel coatings and refractory products

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5. Jewelry Investment Powder

A key component in lost-wax casting materials for jewelry and precision metal parts:

• Controls thermal expansion during burnout
• Enhances mold strength and dimensional accuracy
• Produces smoother casting surfaces
• Withstands temperatures up to 1400°C

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6. Foundry & Precision Casting

Used in investment casting and shell mold materials, cristobalite ensures:

• Low thermal expansion
• High surface precision
• Excellent thermal shock resistance

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7. Electronics & Semiconductor Industry

High-purity cristobalite serves as a filler in epoxy molding compounds and encapsulants for electronic devices:

• Excellent insulation properties
• Low dielectric constant
• High thermal stability and purity

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8. Cosmetics & Personal Care

In fine powders for toothpaste, scrubs, and foundations, cristobalite offers:

• Gentle abrasiveness
• Smooth, silky texture
• Excellent dispersibility and brightness

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Typical Specifications

Parameter	Specification
Chemical Composition (SiO₂)	≥ 98.5%
Whiteness	≥ 90
Particle Size (D50)	20–50 μm (customizable)
Bulk Density	0.6–1.0 g/cm³
Mohs Hardness	6.5–7
Thermal Expansion Coefficient	1.5–2.5 × 10⁻⁶ /°C
pH Value	6–8
Loss on Ignition (LOI)	≤ 0.5%

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Packaging & Storage

• Packaging: 25 kg paper bags / 1000 kg jumbo bags
• Storage: Store in a dry, ventilated area; avoid moisture absorption
• Shelf Life: 12 months under proper storage conditions

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Summary

Cristobalite powder is a versatile and essential functional material widely used in industries requiring high whiteness, durability, and thermal stability.
Its unique physical and chemical characteristics make it indispensable for artificial stones, coatings, plastics, precision casting, and high-tech materials.

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