The lab report confirmed that the coating is insoluble in water, so it suits outdoor packaging.

實驗室報告證實這種塗層不溶於水，因此適合用於戶外包裝。

Please ship the insoluble powder in sealed drums to prevent contamination during transport.

請將這批不溶性粉末裝在密封桶中運送，以免運輸途中受到污染。

Customers complained that the supplement was insoluble and left grit at the bottom of the glass.

顧客抱怨這款營養補充品無法溶解，會在杯底留下顆粒。