Standard Substance, Standard Sample for Analytical Chemistry

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9</li> </a> </ul> </div> <div class="add_flex_h1"> <h1 class="add_category special_font">Standard</h1> <a href="https://www.echemi.com/cr/standard-raw-materials-c2411.html"><i class="iconfont icon-shou"></i> Get Standard Raw Materials by Region</a> </div> <div class="cate_list"> <div class="items_tr clearfix"> <div class="items_top"> <a href="https://www.echemi.com/products/pd180521105461-zinc.html" > <div class="name"> <h2>ZINC</h2> (52374-36-4)</div> </a> <ul class="clearfix"> <a href="https://www.echemi.com/sds/zinc-pd180521105461.html" class="sds_a">ZINC SDS</a> </ul> </div> <ul class="items_ul clearfix"> <li> <div class="img"> <img data-src="https://file.echemi.com/fileManage/upload/cas/508/5e735f6e-b02c-44de-9a9f-00a1a1074052.png" alt="buy Zinc dust" title="Zinc dust" onerror="this.src='https://static-www.echemi.com/static_v3/images/common/defaultGoodsPicSize200.jpg'" class="lazyload"/> </div> <p class="grade"> - / 99% </p> </p> <div class="supplier_name">  <a 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