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Tourmaline powder is derived from mechanically pulverizing raw tourmaline ore after removing impurities. The processed and purified tourmaline powder has high far infrared emissivity. The general chemical formula of tourmaline isNaR3Al6Si6O18BO33(OH,F)4, and the crystal tourmaline belongs to the general term of a family of cyclic silicate minerals in the trigonal system. Usually the body of tourmaline crystal is triangular column with different crystal shapes at both ends. The columns have vertical stripes, often in columnar, needle-like, radial and massive aggregates. Forreferringto physical properties, tourmaline has the following ones: glass luster, fracture rosin luster, translucent to transparent, no cleavage, Mohs hardness 7-7.5, specific gravity 2.98-3.2 with piezoelectricity and pyro-electricity.
Chemical Components:
Components | Value Range |
SiO2 | 38-40% |
B2O3 | 7-10% |
Al2O3 | 38-42% |
CaO | 0.7-1.2% |
MgO | 8.5-9.7% |
K2O | 0.3-0.6% |
Na2O | 1.5-2.5% |
Physical Properties:
Whiteness | 94-97 |
Residue on Sieve 325mesh | 0.01-0.02% |
oil absorption value | 55-65 |
Bulk Density | 470-500kg/m3 |
Volatiles | 0.4-0.5% |
Loss on ignition | 0.6-0.7% |
Average particle size)(D50 | 1.9-2.0um |
Product Application:
Functional masterbatch, PP polypropylene, Meltblown non-woven fabric, Paints&Coatings, Cosmetics, etc.
The most common usage of tourmaline powder is using as electret in the processing of the melt-blown nonwoven fabric. During the process, tourmaline powder and the carrier particlesturn into electretunder high voltage of 5-10kv by a static electricity generating device to improve the filtration efficiency and brings benefit of anti-bacteria. Electret refers to an electrolyte material that has the function of storing charges for a longperiod.
Tourmaline could be used as masterbatch by mixing with other materials such as pp capsules during the manufacturing of melt-blown fabric.
Tourmaline Powder is used in Paints and Coatings industries as well due to its physical properties such as whiteness, oil absorption and loss on ignition fit the needs of building materials industry. In this case the powder could release trace mineral elements.
Tourmaline powder is non-toxic, tasteless and containing rich mineral elements, it is used in cosmetics industry for filler purpose such as facial masks and skin care products nowadays. Tourmaline powder sizes(MESH): 800, 1250, 2500, 4000, 6000, 12500
