|
項目
|
工業級優級品 |
工業二級品 |
外觀 |
白色粉末或白色晶體狀 |
白色粉末或白色晶體狀 |
含量(Sn) |
≥42% |
≥36.5% |
鉛(Pb) |
≤0.002% |
≤0.002% |
銻(Sb) |
≤0.0025% |
≤0.002% |
砷(As) |
≤0.001% |
≤0.002% |
鐵(Fe) |
≤0.02% |
≤0.02% |
游離堿(NaOH計) |
≤3.5% |
≤4.5% |
硝酸鹽(No3計) |
≤0.1% |
≤0.2% |
堿不溶物 |
≤0.1% |
≤0.2% |