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ARTICAL 2- MATERIAL / QUALITY 2.1. Chemical Composition SiO2 : 99.50% min. Fe2O3 : 0.0100% max. If higher than 0.010% there will be price adjustment as stated at Clause 3.2 Al2O3 : 0.50% max. TiO2 : 0.060% max. CaO : 0.010% max. Moisture for all products ≤ 6% max 2.2. Physical Characteristics +0.710 mm (+25 mesh) : 0% +0.60~0.710mm (+30-25 mesh) : ≤ 5.0% +0.106~0.60mm (+140-30 mesh) : > 90% -0.106mm (-140 mesh) : ≤ 5.0%