ER00414
White PTFE/Red Silicone Septa 13.5 × 1.5 mm, 15 mm Black Screw Polypropylene Cap, 9 mm Centre Hole, 100/pk
13.5 × 1.5 mm
Lead time 3-4 weeks, ships from the Czech Republic (EU)
€23.04 per pack of 100 €0.23 per cap
15 mm screw caps (ND15)
15 mm black polypropylene screw caps for 15-425 vials, closed top with natural PTFE/natural silicone septum or with a 9 mm centre hole and white PTFE/red silicone septum (13.5 × 1.5 mm).
They close 8 ml and 12 ml screw vials, in packs of 100. Items not in stock have a lead time of 3 to 4 weeks.
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Products
ER00415
Nature PTFE/Nature Silicone Septa 13.5 × 1.5 mm,15 mm Black Screw Polypropylene Cap, Closed-Top, 100/pk
13.5 × 1.5 mm
Lead time 3-4 weeks, ships from the Czech Republic (EU)
€23.04 per pack of 100 €0.23 per cap
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The vial decides the cap. Match the neck and closure type first, then choose the septum material and the cap style.
Step 1: Match the cap to the vial neck
| Vial neck | Typical vials | Cap to order |
|---|---|---|
| 8-425 screw | 2 ml, 11.6 × 32 mm | 8 mm screw cap (ND8) |
| 9 mm short thread | 2 ml and 0.3 ml, 11.6 × 32 mm | 9 mm short-thread screw cap (ND9) |
| 11 mm crimp | 2 ml and 0.3 ml, 11.6 × 32 mm | 11 mm aluminium crimp cap (ND11) |
| 13-425 screw | 4 ml, 14.5 × 45 mm | 13 mm screw cap (ND13) |
| 15-425 screw | 8 ml and 12 ml | 15 mm screw cap (ND15) |
| 18 mm precision screw | 10 ml and 20 ml headspace | 18 mm magnetic screw cap (ND18) |
| 20 mm crimp | 6, 10 and 20 ml headspace | 20 mm crimp cap (ND20) |
| 24-400 screw | 20 to 60 ml EPA vials | 24 mm screw cap (ND24) |
Thread systems are not interchangeable: a 9 mm cap will not seal an 8-425 or 10-425 vial, even though the sizes look close. Crimp caps need a hand crimper, and a decapper to remove them.
Step 2: Septum material
| Septum | Use it for | Note |
|---|---|---|
| PTFE/silicone | Most HPLC and GC work, repeat injections | The PTFE face meets the sample; the silicone reseals after the needle is withdrawn |
| PTFE/silicone/PTFE | Samples that may contact both faces of the septum | PTFE on both sides for extra chemical resistance |
| PTFE only | Single injections | Very inert, but does not reseal after piercing |
| PTFE/butyl | Headspace GC and volatile samples | Butyl rubber has low gas permeability; rated for lower temperatures than silicone |
| PE foam liner | Closed caps for storage | Not intended for needle piercing |
Temperature ratings are on each product page. In this range, PTFE/silicone septa are listed for -60 to 200 °C and PTFE/butyl for -60 to 120 °C.
Step 3: Cap style
- Centre hole or closed top: caps with a centre hole leave the septum open to the needle; closed-top caps are for storage and transport.
- Pre-slit septa: easier needle entry, less coring and no vacuum in the vial during sampling. They reseal less well, so avoid them for volatile samples left in the tray for a long time.
- Bonded septa: the septum is fixed in the cap, so it cannot fall out or turn during handling.
- Magnetic caps: for autosamplers that pick up vials with a magnet, which is common in headspace GC.
- Pressure-release caps: 20 mm headspace caps that vent excess pressure when the vial is heated.
Caps and septa are sold in packs of 100. Order caps with vials: on EROHE, equal packs of 9 mm vials and caps get 5% off both. Not sure which cap fits your vial? Email sales@erohe-lab.com with the vial part number.
Questions buyers ask
Which vials do 15 mm caps fit?
Vials with a 15-425 thread, such as the EROHE 8 ml and 12 ml screw vials.
Closed top or 9 mm hole?
Choose the 9 mm hole when a needle must pierce the septum; choose closed top for storage.
What size are the septa?
13.5 × 1.5 mm, fitted in the cap.