Used as a blowing agent or lightweight filler, the Expancel product line is continuing to evolve and find new applications in markets such as thermoplastics, printing inks, coatings, and paper and board. Some of the newest Expancel products include ultra-high temperature microspheres for engineering plastics which reduce weight and save on expensive raw materials. Available in both unexpanded and expanded versions, more common applications include fillers for vehicle bodies, injection-moulded PVC soles for footwear, tennis balls, and wine bottle corks.Expancel is made up of small plastic spheres filled with gas. When the gas inside the shell is heated, it increases its pressure and the thermoplastic shell softens, resulting in a dramatic increase in the volume of the spheres. When fully expanded, the volume of these spheres increases more than 50 times.