Polyvance added two R18 Glass-Reinforced Polypropylene Welding Rod Profiles that are designed to reinforce the backside of welds on unreinforced PP materials. The profiles include the -02 profile 3/16” diameter round rod and the -05 profile 5/8” wide ribbon. These profiles join the existing -04 profile 3/8" wide ribbon. R18 is a polypropylene reinforced with 15 percent long glass fiber. This material is used on radiator supports and many other underhood components.