The Rubber Manufacturers Association's (RMA) revised zipper rupture bulletin is now available.
"The purpose of this bulletin is to describe the inspection procedures for identifying potential sidewall circumferential ruptures (also know as zipper ruptures) on truck/bus tires and light truck tires of steel cord radial construction," say RMA officials.
Zippers are caused when ply cords weakened by under-inflation or overloading break one after another, creating a sudden rupture in the upper sidewall with explosive, often deadly force.
The bulletin, Inspection Procedures to Identify Potential Sidewall Zipper Ruptures In Steel Cord Radial Truck, Bus and Light Truck Tires, is available by phone at (800)325-5095.
