Choosing the right syringe is crucial for ensuring a tight and secure injection port, proper instrument operation, accurate injection volume, and a long service life. We offer syringes based on application relevance, instrument compatibility, and individual preference.

Analytical sample vials, also known as sampling vials, purification vials, sterile vials, or clean vials, are specialized instruments for contamination detection and conform to international cleaning standards such as ISO 3722, ASTM Type I Class A, and USP Type I. We offer analytical sample vials in both glass and plastic, with various colors, sizes, capacities, and material compositions to choose from.

Carbonaceous adsorbents are porous carbonaceous materials with high specific surface area prepared from coal or organic matter. Their preparation process includes raw material crushing, carbonization, and activation. The carbonization temperature significantly affects adsorption performance by controlling the pore structure and surface properties.

Chromatography has a history of over eighty years since its invention. It is a commonly used method for purifying and separating organic or inorganic substances. Chromatography in which the stationary phase is more polar than the mobile phase is called normal-phase chromatography, and vice versa, it is called reversed-phase chromatography. According to the principle of "like dissolves like," substances with higher solubility in the stationary phase in a mixture elute later, have longer retention times, and are more difficult to elute.

Howei offers a diverse range of products, including a variety of carefully designed, high-quality media and accessories, supporting low-pressure liquid chromatography (LPLC) separations for a wide range of applications. Whether it's biomolecule purification, protein chromatography, or small molecule separation, our LPLC products deliver superior performance and reliability.

Thin-layer chromatography (TLC) involves coating a suitable stationary phase onto a glass plate, plastic, or aluminum substrate to form a uniform thin layer. After spotting and development, the ratio shift (Rf) of the chromatogram is compared with the ratio shift (Rf) of the chromatogram obtained by the same method for a suitable reference substance. This method is used for drug identification, impurity detection, or content determination. TLC is an important experimental technique for the rapid separation and qualitative analysis of small amounts of substances and is also used to track reaction progress.