适用于弱碱，弱酸，油类，尤其能耐研磨性介质。
Applicable to weak base, weak acid, oli, especially resistant to abrasive medium.
适用于各种水质、海水、咸水、油类、脂类、弱酸、弱碱等介质，尤其能耐研磨。（此盘根按颜色分为黑色和白色）。
Suitable for various kinds of water quality, water, salt water, oil, lipid, weak acid, stoichiometric such media, especially ability grinding. (the stuffing the color is divided into black and white).
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