缓蚀阻垢剂 LD-ZH-DY LD-401(ZH371DY)多功能缓蚀阻垢剂(相当于S-113) LD-402(ZH341DY)锌基缓蚀阻垢剂(相当于N-7356) LD-403(ZH392DY)腐蚀性水质用缓蚀阻垢剂(相当于S-6100) LD-404(ZH373DY)磺酸盐多元新型缓蚀阻垢剂 LD-406(ZH374DY)电厂用缓蚀阻垢剂 LD-407(ZH551DY)变色阻垢缓蚀剂