From：Xiamen Hosingtech Auto Parts Co., Ltd Release time：2018-07-11
Silicone tubing is the softest and most flexible tubing. It is translucent white; you can see light through the tubing and easily locate a meniscus, but not see shapes through the tubing. Unlike vinyl tubing, there is no plasticizer dissolved in the tubing material; the tubing is pure polymerized silicones with nothing to leach out. This makes silicone tubing suitable for use with most solvents, especially when used at room temperature and with short (< 24 hr) contact periods.
Polyethylene tubing is a "semi-rigid" tubing material. It can handle significantly high pressures than either the vinyl or silicone tubing. While it is still a translucent material, it is significantly more opaque than silicone and it can be difficult to determine the position of either a meniscus or an air bubble. Polyethylene tubing is ideal for plumbing a low-pressure chromatography system. The increased rigidity of the polyethylene tubing when compared to vinyl tubing can make the layout appear neater and more organized.
FEP (fluorinated ethlyene-propylene) tubing is very chemically inert and also "semi-rigid". It can handle pressure similar to those that polyethylene tubing can handle. It is resistant to any chromatographic solvent and is especially useful when using organic solvents.