February 1989: Two people were injured in an explosion. One man suffered second- and third-degree burns over 13 percent of his body.

July 1997: A flash fire started while employees were using flammable liquid to clean a sticky floor. Two workers were burned, one of whom died about a month later.

June 1999: A flash fire in a mixing tank severely burned an employee. The federal Occupational Safety and Health Administration later fined the company $219,000 and issued nine serious safety citations.

June 2000: The state Environmental Protection Division fined the company for violating rules for hazardous waste management.

Jan. 2001: An employee's legs were amputated when he became pinned in a machine. OSHA later fined the company for several violations.

July 2005: An EPD settlement called for the company to pay $29,780 for air quality violations.

July 2006: EPD cited the company for failing to complete upgrades of air pollution control equipment, including emissions controls on outside chemical storage tanks.

November 2007: After an investigation, OSHA fined the company for its handling of the flammable chemicals acetone and xylene.

March 2008: An EPD settlement of $38,000 for the company's failure to meet a July 2006 consent order on installation of pollution control equipment.

February 2009: EPD citation for violation of Amrep's air quality permit

January 2010: $10,000 EPD settlement for violations of the air quality permit.

January 2010 - Zep Inc., bought the company for about $64.4 million.