ZHENGZHOU KNOWNCHEM IMP. AND EXP. CO., LTD as the subsidiary company of State-owned (ARTEX )group belong to attach government enterprise, Founded in 1986 with ISO9001-2008 international quality certification and all our products have been detected by SGS and other authoritatives bodies. And an annual turnover of US$180 billion. Including two big branch departments ,KNOWNCHEM as professional large-scale manufacturer of all types of chemicals, integrating development and production together. Our ...