Air leakage in seals with application to syringes

Rodriguez, Nestor; Tiwari, Avinash; Persson, Bo

doi:10.1016/j.apsadv.2022.100222

Journal Article

FZJ-2022-03889

Air leakage in seals with application to syringes

Rodriguez, N. (Corresponding author)Extern* ; Tiwari, A.FZJ* ; Persson, B.FZJ*

2022
Elsevier Amsterdam

Applied surface science advances 8, 100222 - (2022) [10.1016/j.apsadv.2022.100222]

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Please use a persistent id in citations: http://hdl.handle.net/2128/32156 doi:10.1016/j.apsadv.2022.100222

Abstract: We study the leakage of air in syringes with Teflon coated rubber stopper and glass barrel. The leakrate depends on the interfacial surface roughness, the viscoelastic properties of the rubber and on the elastoplastic properties of the Teflon coating. The measured leakage rates are compared to the predictions of a simple theory for gas flow, which takes into account both the diffusive and ballistic air flow, and the elastoplastic multiscale contact mechanics which determines the probability distribution of interfacial separations. The theory shows that the interfacial air flow (leakage) channels are so narrow that the gas flow is mainly ballistic (the so called Knudsen limit). The implications for container closure integrity is discussed.

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