We have extruded oval tubing for over a decade, but this is the first time we extruded it in our PETG (Provista) formulation. PETG has some advantages over CAB in that it is FDA and NSF compliant with food contact, and our employed formula has passed the NFPA 286...
Ovality
Ovality, or out-of-roundedness can be a problem in pneumatic conveying. Our tolerance of out of roundness varies with our tube outer diameter. Ovality can be checked with calipers (as usually the case checking the OD) but in certain circumstances, we need a machined...