Serials of naphthalin and tripolycyanamide have low water reducing efficiency.

萘系与三聚氰胺系减水率较低。

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Serials of naphthalin and tripolycyanamide have low water reducing efficiency, bad flow degree under low water cement ratio and sharp loss of concrete slump.

萘系与三聚氰胺系减水率较低，在低水灰比下流动性较差且坍落度损失较大，不利于商品混凝土的运输和施工。

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Testing by Sanlu found tripolycyanamide, also known as melamine, in 700 tons of its product, the news agency reported.

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