ALWSCI HPLC LC 8-425 Vial Caps Black PTFE Silicone Septa 1000pcs

Description

Product Overview

The ALWSCI 1000‑piece collection of screw‑thread vial caps is engineered for high‑performance liquid chromatography (HPLC) and liquid chromatography (LC) laboratories that demand reliability, durability, and ease of use. Each cap combines a robust polypropylene body with an integrated PTFE/Silicone septum, delivering a dual‑layer barrier that protects samples from oxidation, contamination, and evaporation. The caps are sized for standard 8‑425 mm autosampler vials, making them compatible with 1.5 mL, 1.8 mL, and 2 mL vial formats commonly used in analytical chemistry, pharmaceutical testing, and environmental monitoring. The black coloration provides UV protection and reduces visual glare in automated sampling environments, while the precision‑machined screw thread ensures a tight, leak‑free seal that can withstand temperatures up to 180 °C on the septum side and 100 °C on the cap body. This combination of materials and design features supports rigorous analytical protocols, extending sample stability and preserving integrity throughout the analytical workflow.

Usage

These caps are ideal for a wide range of laboratory applications, including routine sample storage, automated autosampler loading, and high‑throughput screening. In pharmaceutical development, the caps protect active pharmaceutical ingredients (APIs) from moisture and light, ensuring accurate potency measurements. Environmental labs benefit from the chemical resistance of PTFE and silicone, allowing analysis of volatile organic compounds without loss of analyte. The caps also perform well in forensic toxicology, where sample integrity is critical for legal admissibility. Their temperature resistance makes them suitable for thermal stability studies, where samples may be heated to 180 °C during derivatization or other preparatory steps. The pre‑assembled design eliminates the need for separate septum insertion, reducing handling time and minimizing the risk of cross‑contamination, which is especially valuable in regulated environments that require strict chain‑of‑custody documentation.

Why Choose Us

Choosing ALWSCI means selecting a partner committed to quality and consistency. Each cap undergoes rigorous quality control testing, including leak testing, dimensional verification, and material purity analysis, to meet ISO 9001 standards. The polypropylene used is medical‑grade, ensuring low extractables and compatibility with a broad spectrum of solvents, acids, and bases. The PTFE/Silicone septa are manufactured under cleanroom conditions, providing a uniform thickness that guarantees reproducible injection volumes in autosampler systems. Our caps are backed by a responsive technical support team that offers guidance on optimal usage, troubleshooting, and compliance documentation. Additionally, we provide a comprehensive certificate of analysis (CoA) for each batch, giving laboratories the confidence needed for method validation and regulatory submissions.

Key Features

• Robust polypropylene body ensures chemical resistance and low extractables for diverse solvent systems.
• Integrated PTFE/Silicone septum provides a dual‑layer seal resistant to temperatures up to 180 °C.
• Black screw‑thread design reduces UV exposure and glare, enhancing sample stability in automated systems.
• Pre‑assembled caps eliminate manual septum insertion, saving time and reducing contamination risk.
• Comprehensive technical support and batch‑specific certificates of analysis ensure regulatory compliance.

FAQ

What vial sizes are compatible with these caps?

The caps are designed for standard 8‑425 mm autosampler vials and fit 1.5 mL, 1.8 mL, and 2 mL vial volumes commonly used in HPLC and LC applications.

Can the caps withstand high temperatures during sample preparation?

Yes. The PTFE/Silicone septum is rated up to 180 °C, while the polypropylene cap body tolerates temperatures up to 100 °C, making them suitable for most thermal processes.

Are the caps compatible with all solvents?

The polypropylene material offers broad chemical compatibility, including resistance to most organic solvents, acids, and bases used in chromatography labs.

Do the caps provide any protection against light exposure?

The black coloration of the caps helps shield samples from UV and visible light, reducing photodegradation of light‑sensitive compounds.

What quality certifications do these caps have?

All caps are produced under ISO 9001 quality management systems and are supplied with a certificate of analysis for each production batch.