Google search educated me that the red surface is the PTFE material compatible to wider range of chemical compared to the white silicone surface.
reliable results in GC, HPLC and headspace analyses. offers a comprehensive collection of sample vials ... Crimp seals ND8 with red rubber/PTFE septa.
Some sample vials have low adsorption, but the results show low consistency in black plastic cap with centre hole; silicone white/PTFE red; 55° shore A; ...
2 mL, 9 mm, Screw Top Vial with PTFE/Red Rubber Closure-Kit. PerkinElmer. Available with either glass or polypropylene vials and a range of cap choices, these
Quality vials are essential for reliable analytical results. All Aijiren Technology Certified Vials screw cap has a PTFE/silicone septum bonded to the polypropylene.
The vials used for the preparation of breath samples for automated solid-phase microextraction–gas chromatography–mass spectrometry analysis are crimped
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The cross-contamination of two types of cap material (PE and PTFE/silicone) used in glass vials of autosamplers for SEC and HPLC analysis have been
2mL crimp top vial with a white silicone/red PTFE seal. 100. 2-CV. 2mL, clear glass, crimp top, flat bottom, wide neck vial. With write-on patch.
The PTFE is on the lower side that faces your sample in the vial and is relatively inert to solvents. The top side is red coloured rubber or
Snap/Crimp vials can be closed with either crimp caps or snap caps. (VZS-02SC-100) Clear Glass 1.8ml + Red Snap Cap, PTFE/Red Rubber Septum ...
PTFE/Red Rubber. 200 104. 100/PK. 200 016. 2mL. Clear Glass. 200 000. Aluminum Seal. PTFE/Silicone. 200 158. 100/PK. Dry Vials™ for Moisture Analysis.
These transparent vials are an economical alternative to glass CASE PACK. 156300. Silicone/PTFE single slit natural. 100 pcs. 156301 red.
Chromatography Vials, Pre-assembled Convenience Pack, Standard Opening Screw, 8x425mm Thread, Clear Vial, Black Polypropylene Cap, PTFE/Red Rubber Septa,