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Polyacrylic Acid
At present, the suction head on the market is basically polypropylene plastic (colorless transparent plastic, high chemical inertia, wide temperature range). However, the same polypropylene can vary greatly in quality.
PCB has many unique advantages
Carboxymethyl cellulose, a product of substitution of the carboxymethyl group of cellulose. Depending on the molecular weight or degree of substitution, it can be a completely soluble or insoluble polymorph, and the latter can be used as a weakly acidic cation exchanger for the separation of neutral or basic proteins, etc.
Pour boiling water into the thermos cup and tighten the cork or lid clockwise for 2-3 minutes, then touch the outer surface of the cup body with your hands.
Bento has existed since ancient times, and in modern society, it is more common due to the continuous growth of office workers. A delicious and nutritious bento can not only supplement the body's needs, but also make the mood happy.
What is a good dish to bring for lunch? 3 dishes that are suitable for lunch boxes, not easy to spoil and nutritious!