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Wollastonite Calcium Silicate

CaSiO3

The needle-shaped reinforcing mineral — exceptional aspect ratio, low thermal expansion, and superior reinforcement for plastics, ceramics, and coatings.

15-20:1 Aspect
95%+ CaSiO3
Low LOI
ISO Certified
Request Quote View Grades
12+Grades
8+Industries
35+Countries
25+Years
Wollastonite - 20 Microns
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Product Overview

About Wollastonite

Understanding the fundamentals of wollastonite

Product Overview

The Acicular Reinforcing Mineral

Wollastonite (CaSiO₃) is a naturally occurring calcium silicate with unique needle-like (acicular) crystal structure, providing exceptional reinforcement in composites.

Its high aspect ratio, low thermal expansion, excellent thermal stability, and neutral pH make it ideal for plastics, ceramics, friction materials, and metallurgical applications.

Contact Metamorphic Skarn Deposits Crystalline
CaSiO3

Chemical Formula

Wollastonite

Chemical Properties
  • CaSiO3 Content95-98%
  • CaO Content46-48%
  • SiO2 Content50-52%
  • LOI<1%
Physical Properties
  • Mohs Hardness4.5-5
  • Aspect Ratio15-20:1
  • Specific Gravity2.9
  • pH9.5-10
15-20:1
Aspect Ratio
95%+
CaSiO3
<1%
LOI
ISO
Certified

Natural Reinforcement

Asbestos-free natural reinforcing mineral.

Asbestos-FreeNaturalSafe
Wollastonite mineral deposits
Natural Source

From Skarn Deposits
to Premium Reinforcement

Processed from high-quality deposits to preserve the unique acicular structure for optimal reinforcement.

100M+Tons Global Reserve
25+Years Processing
3+Mining Sites
Acicular structure
High aspect ratio
Low thermal expansion
Asbestos-free
Premium quality
Advantages

Key Benefits

Why wollastonite is the preferred choice for industry leaders worldwide

01

High Aspect Ratio

Needle-like structure with 15-20:1 aspect ratio for superior reinforcement in composites.

02

Low Thermal Expansion

Minimal coefficient of thermal expansion improves dimensional stability in ceramics.

03

Thermal Stability

Stable at high temperatures with less than 1% LOI, no volatile components.

CaSiO₃
15-20:1Aspect Ratio
6Key Benefits
8+Industries
04

Asbestos Replacement

Safe, natural alternative to asbestos fibers in friction and reinforcement applications.

05

Neutral to Alkaline pH

pH 9.5-10 provides compatibility with many polymer and cement systems.

06

Faster Firing

Reduces firing time and energy in ceramic production due to fluxing action.

Industrial manufacturing excellence
World Class Quality

Industry-Leading Performance
at Every Scale

Trusted by leading manufacturers across 50+ countries for consistent, high-purity wollastonite that meets international standards.

ISO 9001 EcoVadis Gold REACH Compliant Lab Certified
ISO Certified
Global Supply
Lab Tested
Industry Leading
Product Range

Available Grades

Comprehensive range of wollastonite grades for diverse industrial applications

Precision quality testing of wollastonite grades

Precision Engineered Grades

Every grade is meticulously tested in our state-of-the-art laboratories to meet the most demanding industrial specifications worldwide.

Aspect Ratio15-20:1
CaSiO395%+
LOI<1%
CertifiedISO
Most Popular
Plastic

Plastic Grade Wollastonite

Reinforcing

High aspect ratio wollastonite for reinforcement in engineering plastics.

  • High aspect ratio
  • Low warpage
  • Good dispersion
Learn More
Ceramic

Ceramic Grade Wollastonite

Body Flux

Wollastonite for ceramic bodies with reduced firing time and improved properties.

  • Faster firing
  • Low shrinkage
  • Improved strength
Learn More
Paint

Paint Grade Wollastonite

Extender

Micronized wollastonite for paints and coatings applications.

  • Good coverage
  • pH buffer
  • Reinforcement
Learn More
Friction

Friction Grade Wollastonite

Asbestos-Free

Safe asbestos replacement in brake pads and friction materials.

  • Asbestos-free
  • Heat stable
  • Reinforcing
Learn More
Product Statistics
4Grade Categories
12+Product Variants
VariousAspect Ratios
Request Custom Grade
ISO 9001 Certified Global Delivery Technical Support Custom Solutions
Applications

Industries & Applications

Versatile applications across diverse industry verticals worldwide

Plastics & Polymers

Plastics & Polymers

Reinforcement in PA, PBT, PP and engineering thermoplastics for automotive and electrical.

PAPBTPPEngineering
20%Loading
Ceramics

Ceramics

Flux and body modifier for tiles, sanitaryware, and technical ceramics.

TilesSanitarywareTechnical
15%Addition
Friction Materials

Friction Materials

Asbestos-free reinforcement in brake pads and clutch facings.

Brake PadsClutchFriction
SafeAlternative
Paints & Coatings

Paints & Coatings

Functional filler for improved scrub resistance and durability.

DecorativeIndustrialExterior
10%Loading
Metallurgy

Metallurgy

Flux and slag conditioner in steel and metal production.

SteelFoundrySlag
FluxFunction
Construction

Construction

Additive in cement, mortars, and fiber cement products.

CementMortarFiber Cement
StrengthBoost
8+Industries
12+Applications
35+Countries
350+Customers

Need a Custom Solution?

Our experts help you find the perfect grade

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Our Promise

Why Choose 20 Microns?

World-class quality minerals backed by decades of expertise & innovation

20 Microns state-of-the-art manufacturing facility

Years of
Excellence

ISO 9001
Acicular
Premium
Certified

Our wollastonite is sourced from premium skarn deposits and processed to preserve the unique acicular structure for maximum aspect ratio and reinforcement performance.

Premium Quality

High-quality skarn deposits

Gentle Processing

Preserves needle structure

Consistent Quality

Batch-to-batch reliability

Technical Support

Expert application assistance

Start Your Journey With Us
Key Metrics
3+Processing Plants
35+Countries Served
350+Happy Customers
25+Years Experience
EcoVadis Gold Sustainability Rating
15:1+Aspect Ratio
R&DInnovation
24/7Logistics
ExpertSupport
Knowledge Base

Frequently Asked Questions

Get answers to common questions about Wollastonite

Knowledge Center

Find detailed answers about specifications, applications, and technical details.

4Questions
24/7Support
TechnicalApplicationsGradesQuality

Still Have Questions?

Our team is here to help

Contact Us
01

What is wollastonite used for?

Wollastonite is used for reinforcement in plastics, ceramics flux, friction materials, and metallurgical flux due to its unique acicular structure.

Plastics Ceramics Friction
02

Is wollastonite a safe asbestos replacement?

Yes, wollastonite is an approved, safe alternative to asbestos in friction materials and reinforcement applications with no health concerns.

Safe Approved Asbestos-Free
03

What aspect ratios are available?

We offer wollastonite with aspect ratios from 3:1 to 20:1, depending on the grade and processing for different application requirements.

Standard High AR Custom
04

How does wollastonite improve ceramics?

Wollastonite reduces firing time, minimizes shrinkage, and improves strength in ceramic bodies while providing excellent thermal shock resistance.

Fast Firing Low Shrinkage Strength

Still have questions?

Our technical experts are available to provide detailed answers

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Industry Applications

Product Applications

Wollastonite serves as a critical input across diverse industrial sectors worldwide

01

Plastics

Reinforcing filler in polymers.

02

Ceramics

Body flux and modifier.

03

Friction

Brake pads and clutch.

04

Paints

Functional extender.

05

Metallurgy

Flux in steelmaking.

06

Construction

Cement additive.

07

Adhesives

Reinforcing filler.

08

Rubber

Processing aid.

8+Application Sectors
12+Product Grades
35+Countries Served
350+Industry Clients
Wollastonite industrial applications worldwide
Global Industrial Reach

Powering Industries Across
50+ Countries

From cosmetics to oil & gas — wollastonite is the essential mineral behind thousands of products you use every day.

Need a Specific Grade for Your Application?

Our experts will guide you to the perfect wollastonite solution

Request Expert Consultation
Product Video

See It In Action

Watch how 20 Microns' Wollastonite powers real-world industrial applications

Wollastonite in Action – 20 Microns
YouTube
Official Product Film

Wollastonite - Acicular Reinforcement

20 Microns Limited · Official Channel

About This Video

Discover how 20 Microns' Wollastonite grades deliver superior performance across industrial applications.

  • Product manufacturing overview
  • Quality control processes
  • Application demonstrations
  • Global supply capabilities
Watch on YouTube

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Wollastonite

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