Blue, 12 x 32 mm Screw Neck Cap and Preslit PTFE/Silicone Septum, 100/pk
As a part of Waters" wide selection of vials, caps, and other sample accessories, this blue polyethylene screw cap is compatible with a range of vials and other products. Screw caps are designed in consideration with other vial parts in order to achieve high-performance analytical instrumentation for chromatography.
This cap is a universal screw cap. Screwing the cap applies a mechanical force that squeezes the septum between the glass rim and the cap. This kind of cap forms an excellent seal, mechanically holding the septum in place during the piercing process. Screw caps require no tools for assembly.
The screw cap is paired with a Preslit PTFE/Silicone septum, designed to provide adequate venting that prevents vacuum formation in the sample vial. This delivers superior sample-draw reproducibility and eliminates coring from bottom draw-port needles. Scientists can also benefit from the good resealing capabilities, making it recommended for multiple injections, with a working temperature range from -40 C to 200 C. Waters recommends the preslit PTFE/silicone septa for venting and accurate sample draw.
Using a quality vial cap helps ensure reliable and reproducible analytical results. As a part of vial manufacturing, screw caps are tested extensively for quality and cleanliness, confirming that manufacturing, handling, and packaging have all been handled properly. This includes ensuring that the cap is free of any potential contaminants that may cause chromatographic ghost peaks.
These caps come 100 to a pack with 12 x 32 mm measurements, and other related products are available when you shop for lab equipment with Waters, such as the Amber Glass 12 x 32 mm Screw Neck Vial, 2 mL Volume, 100/pk.
FAQs About Blue 12 x 32 mm Screw Neck Cap and Preslit PTFE/Silicone Septum, 100/pk
1. What is the shelf life of these caps?
The shelf life of the Blue 12 x 32 mm Screw Neck Cap and Preslit PTFE/Silicone Septum depends on storage conditions. When stored in a cool, dry place away from direct sunlight and extreme temperatures, these caps and septa typically have a shelf life of 2-3 years. Proper storage ensures the silicone maintains its elasticity and the PTFE layer remains intact, preserving chemical resistance and sealing integrity.
2. What types of vials are compatible with this cap?
The Blue 12 x 32 mm Screw Neck Cap is designed to fit standard 12 x 32 mm screw-thread vials. These vials are commonly used in chromatography applications, including HPLC and GC. The cap is compatible with both glass and plastic vials, provided they have a matching screw neck.
3. Is the septum reusable?
The preslit PTFE/Silicone septum is designed primarily for single use to maintain sample integrity and prevent contamination. Each puncture slightly degrades the sealing capability and chemical resistance of the septum. For critical applications, such as those requiring airtight seals or precise chromatographic analysis, it"s recommended to use a new septum after each use. However, for non-critical or preliminary work, the septum may tolerate limited reuse if handled carefully.
4. What is the purpose of the preslit design in the septum?
The preslit design in the septum facilitates easier needle penetration, reducing the risk of needle bending or breaking during sample injection. This feature is particularly useful for applications with autosamplers or manual injections requiring frequent punctures. The slit minimizes the force required for needle insertion while maintaining a reliable seal before and after puncture. It also ensures consistent sample delivery and reduces wear on the needle, improving overall efficiency in laboratory workflows.
