Identifying specific chemicals accurately is crucial in the scientific world, and the Chemical Abstracts Service (CAS) has made this task much easier by assigning a unique CAS Registry Number to over 163 million organic and inorganic compounds. These numbers, typically formatted as xxx-xx-x, serve as a kind of "chemical fingerprint" — no matter how many different names a compound might have, it always has just one CAS number. This system eliminates confusion, especially when dealing with substances that have multiple synonyms or complex naming conventions. For example, methanol is also known as methyl alcohol, wood alcohol, carbinol, and even MeOH. With its CAS number 67-56-1, there's no ambiguity — it’s a universal identifier that transcends language and terminology. CAS numbers are especially important in lab settings, chemical transactions, and educational contexts. They make communication more precise and efficient, and they’re completely free to access. You can easily find them through online databases like Google, making them an essential tool for anyone working with chemicals. In addition, CAS numbers help distinguish between different forms of the same compound. For instance, while both 1317-38-0 and 1317-39-1 refer to copper oxide, one is a wire form and the other is a black powder. The CAS number removes any guesswork about which form you're dealing with. The CAS was established in 1907 as a division of the American Chemical Society to help scientists access research literature. It wasn’t until about 60 years later that the CAS introduced the registry number system, aiming to simplify chemical identification. By 1980, the CAS Online Database was launched, revolutionizing how researchers accessed and shared chemical information. Today, it's widely used by organizations such as the U.S. Environmental Protection Agency (EPA), which relies on CAS numbers for accurate chemical identification, and the European Union’s REACH program, which uses them to track potentially hazardous substances. In short, CAS numbers are now a standard in the chemical industry and beyond. If you're looking to find a CAS number, two reliable sources are ChemIDplus from the National Library of Medicine and the NIST Chemistry Webbook from the National Institute of Standards and Technology. Let me walk you through using ChemIDplus. Simply search for “ChemIDplus†on Google and click on the first result. Once you reach the main page, enter the compound name under “Substance Identification.†I’ll use ibuprofen as an example — a topic that recently sparked a friendly debate between my father and me. After entering “ibuprofen,†the main substance name will appear. If you search for a synonym like “Advil,†you’ll need to check the “Names and Synonyms†section to confirm it refers to the same compound. Once you’ve found the correct entry, the CAS number will be listed right below the substance name, often labeled as “RN†for Registry Number. Keep in mind that some websites may display CAS numbers differently — sometimes in brackets or with other abbreviations. But regardless of where you find it, each compound and its various forms will have their own unique CAS number. Always double-check the match between the number and the compound to avoid mistakes — a small error can lead to big problems in research or application. Whether you're a student, researcher, or business professional, CAS numbers are a powerful and free resource that should not be overlooked. City Chemical LLC offers a wide range of bulk chemicals. Visit our featured chemicals page to explore our inventory and place your order today.
The hydraulic cylinder sealing kit is an important component in the hydraulic system, used to prevent hydraulic oil leakage and protect the pistons and rods inside the hydraulic cylinder.
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Choosing the correct hydraulic cylinder sealing kit can extend the service life of the hydraulic system and improve work efficiency.
The following are some key points for purchasing a hydraulic cylinder sealing kit:
1. Determine the model and specification of the hydraulic cylinder: The size and model of the hydraulic cylinder sealing kit must be completely matched with the hydraulic cylinder, otherwise it may cause poor sealing or damage to the sealing components.
2. Choose appropriate sealing materials: The sealing materials for the hydraulic cylinder sealing kit should be selected based on factors such as the type of hydraulic oil, temperature, pressure, etc. The commonly used sealing materials are fluororubber, Butyl rubber, polyurethane, etc.
3. Choose a reliable supplier: Choose a legitimate hydraulic cylinder sealing kit supplier to ensure product quality and after-sales service.
4. Pay attention to installation and maintenance: Proper installation and maintenance of the hydraulic cylinder sealing kit can extend its service life and reduce maintenance costs.