Silicone tubing is made by extrusion of the compounded elastomers, known as high consistency silicone rubbers (HCR). And are widely used in Food, Pharma, Chemical, Electrical, Heavy & medium Engineering, Medical, Thermal Power Stations and PSUs.
Performance in Transfer Operations:
Surface: Inner surface smoothness is sometimes promoted to reduce risk of particle entrapment and buildup. Probably more important is poor wetting to improve drainage and limit biofilm adhesion. Polutetrafluroethulene (PTFE), despite a higher rugosity than electro-polished stainless steel, has been shown to be amenable to biofilm removal. This phenomenon has been linked to its hydrophobicity and high water contact angle.
Note that similarly to PTFE, PDMS also yields a high water contact angle. There are probably some limitations to such compatibility claims: a high water contact angle appears to be important, but this alone is not sufficient to make conclusions regarding low chemical reactivity, and for FDA grade silicone tubing selection, other criteria also need to be considered.
Burst Resistance: Silicone tubing is highly flexible and expands with increased intraluminal pressure. For instance, when you pump high viscosity fluid, there are chances that tube may balloon, and ultimately can burst. According to the dimension, burst strength of silicone tubings is 25 to 250 psi.
Since silicone mechanical properties are strain rate-dependent, burst resistance may be affected by the rate of pressure change Some suppliers quote a maximum working pressure, often between 1/5 and 1/3 of the burst pressure, yet apparently without published data to support this or without explanations about the process variables to be considered. So, setting limits is left with the user.
Sorption: Over time, tubing can selectively absorb certain ingredients from the solution it comes into contact with, in particular low molecular weight substances. A recent study on the sorption of parabens shows that if filling lines are left idle for extended periods, perfluoro tubing performs better than many other tubing products, including silicone tubing, which can absorb up to 40% of the preservatives over a six-hour period. Sorption of other substances has been reported.
You might come across lots of silicone products manufacturing companies, but you should choose quality products as they will be used for risky operations in various industries.
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