Rubber types teflon coating

At the sampling step, contamination from sampling bottles and hydrowire should be minimized [10], Old types of sampling devices such as Nansen and Knudsen are constructed mostly from brass, which may cause contamination of Cu and Zn into seawater. The recently developed Niskin plastic sampling bottle provides less contamination from the sampler walls. However, the materials used for the end-caps or springs, rubber or Teflon-coated stainless steel, sometimes release significant amounts of Ba, Cu, Sb and Zn [14]. 

GO-FLO PVC tube. Teflon coating optional, external rubber spring, for single use and in rosette-type samplers, COC, reduced flushing 1.7-100 3.9 7 ul Std., TM GO... 

Experiments were conducted to show any differences between the type of caps used on the culture tubes. The results showed that Teflon -coated, rubber-lined caps are markedly superior to rubber-lined caps, as evidenced by a slower rate of degradation. However, even with the Teflon-coated, rubber-lined caps, the rate of degradation was much... 

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