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 و 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 و 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.
