ETFE is chemically inert and more suitable for higher pressure applications (when using aqueous mobile phases) than PTFE, FEP, and PFA. Additionally, because ETFE is more rigid than PTFE, FEP, and PFA, this tubing better resists inner diameter collapse.
Tubing tolerance for 1/16" OD is ± 0.001" (25 µm). Tubing tolerance for 1/8" OD is ±0.003" (75 µm).