Head quartered in Rivière-du-Loup Quebec Canada, Prelco inc. an ISO 9001 certified company, is the leader in security and saf ... ety glass manufacturing in Canada. Our company counts nearly fifty (50) years of manufacturing experience and R&D technology development efforts. We manufactures specialty glass products for architectural and industrial markets such as: insulating glass (IG) units, spandrel panels and tempered, laminated, bent and silkscreened glass. read more