Shreenath Mining Works Private Limited
Shreenath Mining Works Private Limited

 


Sodium Feldspar


Sodium Feldspar

In Ceramic bodies, the main vitrifying (fluxing) agent is feldspar.l the majority of white ware bodies contain good proportions of feldspar. It acts as a flux. In the ceramic industry, the flux is defined as that portion of the body which develops glass phase. This is provided mostly by feldspar. The amount of flux in a ceramic body should be only in such a proportion as to develop the desired amount of vitrification. If excess of flux is added, the fired body becomes very glassy and consequently, brittle.


Chemical Properties (% Oxides)

Product

Grade

SiO2

AL2O3

K2O

Na2O

Fe2O3

MGO

CaO

TiO2

Lol

Fring result 1175 oC – 1220oC

Firing appearance

N – 1

First

69%

18%

.50%

10%

.10%

.1%

.05%

Nil

0.10%

Milky white

White to cream

 

 

(+1%)

(+1%)

(+5%)

(+1%)

(+.03%)

(+.1%)

(+.05%)

 

 

 

 

N – 2

Second

72%

17%

2%

8%

.15%

.2%

.2%

Nil

.20%

Off white

White to cream