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（１）石墨和膨润土用于导电水泥生产（ＣＮ１２４１５４６Ａ） 应用石墨、活性膨润土、普通水泥、硫酸铜和丙烯酰胺等成分按一定比例配制成克雷－导电水泥。后者是一种接地降阻材料，它可将原接地电阻降低１０～４倍，降阻系数为０．１－０．２５，电阻率ｐ＜２ ·ｍ（２０℃?
(1) graphite and bentonite for conductive cement production (CN1241546A) The application of graphite, activated bentonite, ordinary cement, copper sulfate and acrylamide and other ingredients according to a certain proportion formulated into Cray - conductive cement. The latter is a grounding resistance reduction material, which can reduce the original grounding resistance 10 to 4 times, the resistance coefficient of 0.1-0.25, the resistivity p <2 · m (20 ℃?