Talc

Talc is an important industrial mineral. Its resistance to heat, electricity and acids make it an ideal surface for lab counter tops and electrical switchboards. It is also an important filler material for paints, rubber and insecticides. Even with all these uses, most people only know talc as the primary ingredient in talcum powder.

Talc is a Mg3Si4O10(OH)2, Magnesium Silicate Hydroxide.

It is valued industrially for its softness, smoothness, high slip or lubricating, oil adsorption properties, low electrical and heat conductivity, high refractoriness and low thermal expansion.

Chemical Characteristics

Extra fin
Talc Grade 1

Extra
Talc grade 2

Excellent
Talc Grade 3

ELEMENT

RESULT%

SiO2

60 - 62

60 - 61

53 – 58

MgO

31.0 - 32.5

30 - 31

28 – 30

Al2O2

0.3 - 0.5

0.5 - 1.0

1 – 2

CaO

0.3 - 0.5

0.5 - 1.0

3 – 6

Fe2O3

0.1 - 0.2

0.2 - 0.4

0.5 - 0.7

Na2O3

<0.01

<0.01

<0.01

K2O

<0.01

<0.01

<0.01

L.O.I

4.5 - 5.0

5.5 - 6.5

8 – 9

P2O5

0.01

0.02

0.04

H2O

0.24

0.180

0.23

Brightness

93 % (min)

88 % (min)

85 % (min)






Physical characteristics:



Melting point : H-1580 EC. Melting point depends on the chemical purity of the product
Solubility : insoluble in water under normal circumstances at 25EC
Solubility : only in H/F reaction products SiF4/H2SiF6
Boiling point : H-2200 EC
Flashpoint : not applicable
Explosiveness : not applicable
Mohs hardness : 7
Odour : none
Structure : granular