the range from about 1 to 20 by weight preferably about 5 to 15 by weight based on the total weight of the polymeric components fig3 is a simplified schematic which illustrates a preferred method of forming the thread protectors of the invention in a particularly preferred embodiment the thread protectors are manufactured by recycling used end caps which have been collected in a step 27 the end caps can then be fed to a shredding and grinding step or steps 29 in which the end caps are reduced in size the size of the shredded and ground particles is not critical but is typically on the order of 0 25 0 5 inches and may be pulverized to about 35 mesh or even to 100 mesh or finer the ground up material is then fed to a thermokinetic mixer in step 31 the corrosion inhibitor and other materials can conveniently be blended during the thermokinetic mixing step 31 since the compounder heats the materials in the range from about 300 400 u00b0 f the corrosion inhibitor should have a flash point above the expected compounding temperature thermokinetic compounders are described for example in issued u s pat no 5 895 790 to good issued apr 20 1999 this reference describes a thermokinetic compounder which can be used for melt blending the device economically recovers polymer blends and waste thermoset material into useful products by.