Zip-Pak introduces its new Zip-Pak® Retort™ zipper that provides converters and food marketers with resealable zipper technology that withstands the high temperatures of retorting. Potential applications include moist pet food, tuna, soup, condiments, and others. Zipper is composed of a unique blend of resins that can withstand temperatures of 250?F for 30 min without losing zipper performance.