Aluminium Oxide
Formula ：Al2O3
M.Wt：M.Wt:101.96
CAS No.：1344-28-1
Characters: white powder, insoluble in water.
Application: analytical reagent, the dehydration of organic solvents, adsorbent, organic reaction catalyst, abradant, refractory material.

Cobaltosic Oxide
Formula ：Co3O4
M.Wt：M.Wt:240.80
CAS No.：1308-06-1
Characters: black powder, insoluble in water and alcohol.

Nickel Oxide
Formula：NiO
M.Wt：74.71
CAS No.：1313-99-1
Characters: green powder; insoluble in water and alkali liquor, soluble in acid and ammonia water.

Bismuth Oxide
Formula：Bi2O3
M.Wt：465.96
CAS No.：12048-50-9
Characters: yellow powder; soluble in acid, insoluble in water.

Tantalum Oxide
Formula：Ta2O5
M.Wt：441.89
CAS No.：1314-61-0
Characters: white powder, insoluble in water and acid,soluble in the molten potassium hydrogen sulfate and hydrofluoric acid.

Niobium Oxide
Formula：Nb2O5
M.Wt：265.81
CAS No.：1313-96-8
Characters: white powder. Turn to yellow when heated, insoluble in water.

Germanium Oxide
Formula：GeO2
M.Wt：104.63
CAS No.：1310-53-8
Characters: white powder.
Application: used in the production of metal germanium, also used for spectral analysis and semiconductor materials.

Gallium Oxide
Formula：Ga2O3
M.Wt：187.44
CAS No.：12024-21-4
Characters: white powder.
Application: used as a high-purity analytical reagent for the preparation of electronic industry semiconductor materials.