It's a 'ring' where I glue water proof polish paper P4000 on.

这是一个'环'我胶水防水波兰文件p 4000上。

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The modification has been made on the black wattle tannin adhesive with sodium sulfite and the MUF concentrate so as to prepare out a tannin adhesive with good water-proof and better glue properties.

采用亚硫酸钠和三聚氰胺- 尿素- 甲醛预缩液对黑荆树单宁胶粘剂进行改性处理，制备具有良好的耐水性能和胶合性能的单宁胶粘剂。

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Rib of slab has prominent water-proof capability. It is fixed by hidden key without any glue. No bolt on the outside surface which prevent from pollution and aging.

立边板肋具有极佳的防漏水性能，不需打胶，暗扣方式固定，表面无外露螺钉，免得污染老化问题。

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