The 13-425 standard thread ensures that it has considerable airtightness, and is often used in gas xenochrome and liquid chromatography. The sample vial has good chemical properties and can be used repeatedly with needles. The 4mL sample vial is often used as a needle washing vial in the autosampler because of its large volume and large opening area. When a needle is not needed and needs to be sealed for storage, it can be replaced with a solid cap to serve as a sample storage.
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