Chromatography vials are used to separate organic and inorganic compounds. There are several types of these vials, which vary in size, finishes, septa, and materials. Many come with a write-on label, which can help eliminate any problems with identification. Chromatography vials are also available in clear, amber, and white colors. Each type has a specific design to maximize retrieval. Here's a good read about Chrom Tech, check it out! Standard chromatography vials are made of glass and come in two sizes: 10mL and 20mL. They come with a PTFE faced or 14B rubber lined phenolic screw cap and are autoclavable. PTFE-lined phenolic screw caps are recommended for organic samples. Replacement caps are also available separately. If you do not need to replace the caps, you can purchase them separately. Plastic chromatography vials are inexpensive and easy to transport. They also have higher heat resistance than glass, making them a good choice for laboratory use. Many plastic chromatography vials are made of polypropylene, which is also popular in Tic Tacs lids and recyclable containers. They are translucent and resistant to heat up to 135°C. They are also more affordable than glass or other alternatives. In contrast to glass, autosampler vials are made of plastic. While glass chromatography vials are inert, polypropylene is preferred for substances that stick to glass. Polypropylene is ideal for substances sensitive to UV light. For cryogenic applications, you should use specially-configured polypropylene vials. These are also autoclavable. Finally, if you are going to use chromatography vials, you must be sure to find ones with silicone O-rings. Choosing chromatography vials is not an easy task. The material of the vial is crucial, because it can easily be contaminated. The materials used for chromatography vials differ depending on the solvents they contain. Clear chromatography vials are generally the most common, while amber glass and black polypropylene are recommended for light-sensitive samples. While PTFE is the most inert material, it is not very resealing. Silicone chromatography vials are more durable, but the only downside is that silicone septa can react with both the sample and solvent. Chromatography vials come in a variety of materials. Glass, for instance, is not suitable for certain applications, including heavy metal analysis, water analysis, protein analysis, and ion chromatography. But polypropylene vials are the best choice for most applications. The latter is more expensive, but it will protect your samples from light and evaporation. The latter is recommended for volatile compounds. Generally, the caps of chromatography vials come with a septum. These caps must be sealed and inert. A screw cap, crimp closure, and snap closure are all available for HPLC vials. Choose the appropriate size of these caps for your sample, as the wrong size can result in poor reproducibility between injections. If you choose the incorrect size, you risk damaging your autosampler needle or failing to form a proper seal between the septum and the vial. Chromatography vials are available in a variety of sizes. The most common sizes are 12x32mm (2mL), 15x45mm (4mL), and 8x40mm (1mL). They come with a mouth opening that is either normal or wide. The cap type is also crucial. Those that need to handle samples with a robotic arm machine need to use 9 mm vial caps. Limited Volume Vials, on the other hand, are made of plastic or glass and have either an attached or removable insert. Kindly visit this website https://en.wikipedia.org/wiki/Vial for more useful reference.