Tourmaline is a complex crystalline silicate mineral compounded with elements such as aluminum, iron, magnesium, lithium, or potassium. In the global industrial mineral market, it is uniquely valued for its spontaneous polarization and piezoelectric properties. Unlike common fillers, Tourmaline is a "living" mineral that generates a permanent microscopic electric field, making it a critical functional additive for high-tech industries.
1. Mineralogical Structure and Electro-Physical Properties
Tourmaline crystals belong to the trigonal system. Under mechanical stress or temperature changes, it exhibits Piezoelectricity and Pyroelectricity.
Spontaneous Polarization: Even without an external field, tourmaline maintains a vertical electrode. This creates a micro-current that can polarize surrounding molecules, such as air or water.
Negative Ion Generation: The surface electric field dissociates water molecules then combines with other water molecules to form Negative Oxygen Ions, essential for air purification and health-tech textiles.
2. Physical & Chemical Performance Indicators
To ensure stability in export trade (DDP/CIF), our industrial grades focus on these core metrics:
Negative Ion Release (NIU): Measured in $ions/cm^3/s$. High-grade powders typically range from NIU depending on the application.
Chemical Stability: Highly resistant to acids and bases, making it a durable filler for industrial coatings and specialty rubbers.
3. Key Industrial Applications
3.1 Functional Textiles & Fibers: Used as a masterbatch additive in polyester or nylon. It imparts permanent antibacterial, deodorizing, and thermal-regulation properties to sportswear and medical fabrics.
3.2 Plastics & Polymer Reinforcement: Acts as a nucleating agent in semi-crystalline plastics (like PP/PE), improving dimensional stability while providing anti-static functions.
3.3 Advanced Coatings & Paints: Added to architectural coatings to neutralize Formaldehyde and TVOCs through the continuous release of negative ions, improving indoor air quality.
4. Selection Guide for International Buyers
Black Tourmaline (Schorl): The most common industrial grade, rich in iron, best for heavy-duty industrial fillers, electromagnetic shielding, and concrete additives.
Schorl-Elbaite Mix: Higher purity, used in high-end cosmetic formulations and specialized electronics.
