الوصف

description: 　　White fused alumina is made from high quality Bayer-processed alumina by fusing in an electric arc furnace at high temperature. It has high hardness and better cutting characteristics. It is suitable for manufacturing of vitrified and resinoid tools, and for lapping, polishing and blasting. It can be also used to make engineering ceramic and superior refractory products. Chemical & Physical Properties Crystal Form Alpha alumina trigonal system Chemical nature Amphoteric Reaction with acids Attck less than brown fused alumina Reaction with Alkalies Very slight with strong hot solution only Oxidation-reduction effects None True Density (g/cm3) 3.*6 Hardness Knoop (kg/cm2) ********0 Moh?s 9.0 Color White Color after firing White Melting point ***0oC Max usable temperature ***0oC Specific heat (cal/xxxxx) *0oC **0oC 0.**3 0.**7 Coefficient of thermal conductivity (cal/cm2.sec oC) Room temperature **0oC 0.**7 0.**3 Electrical resistivity (Wcm) *0oC **0oC **0oC ***0oC ***6 ***3 **5 **4 Coefficient of liner expansion (x***6) *5oC***0oC *5oC****0oC *5oC****0oC 7.*8 8.*2 9.*9 Chemical Composition Grit *2# - *0# **0# - **0# **0# - **0# **0# - ***0# Al2O3 *8.5 min *8.5 min *8.0 min *7.0 min Na2O 0.5 max 0.7 max 0.8max 0.8max Magnetic Material Content (% by weight) Grit Magnetic Material Content *6#**4# <0.***3 *0#***0# <0.***1 **0#***0# <0.***5 Available Sizes F**-F**0, F*******0,W**-W5,JIS***-JIS***0. Other sizes can be also available according to customers requirements Tony.zhao at ftong dot com dot cn ; friend_tony at hotmail dot com