Polyethylene can be efficiently machined with all knowntools used in wood and metal processing. Sawing: Fast-runningcircular and band saws are suitable. Smooth surfaces can be achieved when the teeth are lightlyset.  Saw blades with teeth more than 5/8" apart aresuggested.  Especially with PP, fast chip removal isessential to prevent melting. Milling: Fairly high feed rates and revolutions work best withattentionto reduce heat generation.  Suggested 9,000-12,000 rpm with afeed rate of 250-350 inches per minute. Welding: Quality welds are achieved with the appropriate temperaturesetting and air pressure.  The welding rod must be compatible,and along with the joint surfaces, both should be clean beforestarting.