MIDDLEBURY, Conn. (Dec. 12)—U.S., Canadian and the European Union competition authorities have opened an investigation into possible collusive behavior by manufacturers of EPDM, according to Crompton Corp., whose Uniroyal Chemical business produces EPDM and which alerted the authorities to the possible collusion. Crompton said it notified authorities after it discovered evidence of possible collusive behavior during the course of an internal investigation with respect to rubber chemicals. As a result of its action, Crompton and its relevant affiliates have been conditionally granted amnesty in each of the three jurisdictions with regard to criminal prosecution and fines with respect to EPDM. Amnesty is conditioned upon several factors, including the company´s continued cooperation with the authorities, the firm said. Crompton has been in the EPDM business since 1996 when the company completed a merger with Uniroyal Chemical Corp. The EPDM business had 2001 sales of $152 million.