Alumina KA25 Alcoa Product ASIA/0012-R04/0201 page 1 of Product Information KA25 is a medium soda, high surface area alumina produced at the Kwinana refinery. It is a coarse, sandy alumina with low chemical impurities. Applications Fused alumina Typical Properties of KA25 Calcined Alumina Chemical Analyses, wt % Al2O3 Na2O SiO2 Fe2O3 CaO Particle Size (cumulative) % on 100 mesh (150µm) % on 325 mesh (45µm) Shipping Limit 99.0 min 0.30 max 0.030 max 0.030 max 0.070 max (1) Typical Range 99.6 – 99.7 0.15 - 0.24 0.015 – 0.020 0.008 - 0.013 0.042 - 0.052 (2) Physical Analyses Surface Area (BET) m /g 2 10 max 84 min 1–6 91 – 98 80 max 60 – 70 1) Approximately 2 standard deviations around the mean. 2) Electroform Screens Information presented herein is believed to be accurate and reliable but is not intended to meet any specification and does not imply any guarantee or warranty by Alcoa. a Alcoa World Alumina - Australia Cnr Davy and Marmion Streets, Booragoon, Western Australia 6154, Australia Postal Address: P.O. Box 252, Applecross W.A. 6153, Australia Phone:+61 8 9316 5111, Fax: +61 8 9316 5228