Nanocor receives ISO-9001 certification at Aberdeen, MS. manufacturing facility

Arlington Heights, ILL., May 21, 2004 – Nanocor Incorporation, a wholly owned subsidiary of Amcol International Corp. (NYSE:ACO) announced today that they have received ISO-9001 certification at their Aberdeen, MS. manufacturing facility. The approval period is granted for April 22, 2004 to April 22, 2007.

“We are pleased to join the ISO family. This demonstrates our commitment to provide the highest quality product to our customers, minimizing mistakes” stated Nanocor’s Plant Manager; Fred Nurse. “Our focus is to constantly strive to improve our quality system for the benefit of all involved.”

Nanocor was formed in August 1995 to capitalize on a patented technology that disperses nanoclay particles of chemically modified clays into plastic resins, improving mechanical, thermal and barrier properties. Nanocor sells its Nanomer® products to the packaging, transportation, industrial and performance coatings markets.

Nanocor's parent company, AMCOL International Corp., produces and markets specialty mineral products used for industrial, environmental and consumer-related applications. The company operates in three industry segments, minerals, environmental and transportation. AMCOL's common stock is traded on the New York Stock Exchange under the symbol "ACO." The company's web site is www.amcol.com.