■ Wollastonite(CaSiO3)
Wollastonite(calcium silicate, CaSiO3) is a naturally occuring glossy white or grey non-metallic mineral with an acicular or needle-shaped crystal structure in skarns and is developed in contact between limestone and granite.
This distinctive property makes wollastonite an ideal performance mineral for a wide range of industrial and consumer applications.
Because of its unique cleavage properties, wollastonite beneficiates into needle-shaped particles of varying acicularity(i.e. length of the particle is greater than its diameter, also known as aspect ratio) which KANSAI MATEC controls with its leading-edge pulverizing and separating technology.
The brightness and whiteness of wollastonite also enhance its use for certain filler and ceramic applications.
Finally, wollastonite is completely inert and non-carcinogenic with low biodurability, and its dusts are biosoluble; qualities that have made it a recognized substitute for short-fiber asbestos and many man-made fibers.
With complete control of the mining, milling and classification process at our own advanced facilities , we can provide wollastonite products such as normal grade(long fiber and short fiber filler)and fine grade(powdered filler) with good stable quality.
| Specific gravity | 2.80 - 2.95 |
|---|---|
| Melting point(℃) | round 1,500 |
| Hardness(mohs') | 4.5 - 5.0 |
| Crystal form | triclinic |
| Solubility | 0.0095(g/100ml) |
| pH(10%slurrying) | 9.5 - 10.5 |
| Refractive index | 1.63 |
| Coefficient of expansion | 6.5x106(㎜/㎜/℃) |
| Aspect ratio | 3 - 20 |
Carcinogenic classification of IARC
| Classification | Content | Material |
|---|---|---|
| Group 1 | The agent is carcinogenic to humans. | Asbestos, Benzene etc. |
| Group 2A | The agent is probably carcinogenic to humans. | Ultraviolet rays etc. |
| Group 2B | The agent is possibly carcinogenic to humans. | Weld fume, ceramic fibers etc. |
| Group 3 | The agent is not classifiable as to its carcinogenic to humans. | Wollastonite, Rock wool etc. |
| Group 4 | The agent is probably not carcinogenic to humans. | Caprolactone etc. |
31 Mar.2014
Small scale of wollastonite deposits are occurred in the contact between limestone and granite in Japan.
Main sources of wollastonite are China, USA, Mexico, India and Finland.
