What is Difference Between WFA and BFA?

Both are materials used for refractory applications (mortars, crucibles, unshaped refractory) or abrasives products (grinding wheels, cutting wheels, flapping discs, polishing media, blasting media ). Content of both materials are Aluminium Oxide (Al2O3).

1, Their colors are different. Brown Fused Alumina(BFA) is brown and White Fused Alumina(WFA) is white.

2, BFA is made of bauxite and other raw materials in arc furnaces, WFA is made of calcined alumina powder in arc furnaces.

3, BFA has Al2O3 content of about 95%,while WA more than 99%

4, WA is harder than BFA although they are both hard(mosh hardness 9), while WFA is more fragile.

BFA and WFA similarities are as follows:

Both basic mineral: α-Al2O3

Both PH Value: Neutral

Both Max.usable temperature in air is 1900 Celsius degree, decomposition point is 2250 Celsius degree.

Both main chemical composition of finished products are: Al2O3

Both main applications are: in refractory and abrasives products.

Both Mohs hardness are: 9.0,

Differences are below:

BFA bulk density is (1.53~1.99g/cm3) and true density (3.90g/cm3). While WFA bulk density (1.75~1.95g/cm3) and true density (3.95~3.97g/cm3).

Main raw material of BFA is bauxite, and main raw material of WFA is calcined alumina powder.

BFA has Al2O3 content of 95% Min., WFA has Al2O3 Content of 99% Min.

BFA has refractory temperature 1850 Celsius degree, WFA has refractory temperature 2100 Celsius degree.

Although their Mohs hardness is 9.0,WFA is even harder than BFA, and BFA is more flexible than WFA.