Every chemical is assigned a CAS number. Have you ever wondered what a CAS number is and how they are assigned?
The Chemical Abstract Service or CAS
The Chemical Abstract Service is part of the American Chemical Society and maintains a database of chemical compounds and sequences. The CAS database currently contains over 55 million different organic and inorganic chemical compounds. Each CAS entry is identified by their CAS Registry Number, or CAS Number for short.CAS Numbers
CAS Numbers are up to 10 digits long using the format xxxxxxx-yy-z. They are assigned to a compound as the CAS registers a new compound. The number has no significance to the chemistry, structure or chemical nature of the molecule.The CAS Number of a compound is a useful way to identify a chemical over its name. For example, the compound CAS 64-17-5 refers to ethanol. Ethanol is also known as ethyl alcohol, ethyl hydrate, absolute alcohol, grain alcohol, hydroxyethane. The CAS number is the same for all these names.
The CAS Number can also be used to distinguish between stereoisomers of a compound. Glucose is a sugar molecule that has two forms: D-glucose and L-glucose. D-glucose is also called dextrose and has CAS number 50-99-7. L-glucose is the mirror image of D-glucose and has a CAS Number of 921-60-8.
Comments
Thanks for writing about CAS. Just wanted to mention that our full name is actually “Chemical Abstracts Service” and that “CAS RN” is our preferred short form for CAS Registry Number, which is also a registered trademark. Again, we appreciate your covering our subject material.
good ..thanks for info
gd work,thnkx
What is CAS no. for filler masterbatch, is it no. of RM we have used for it.
Pls. reply
thaaaaaaaaaaaaanks
Nice article.
I would like to know why are two CAS numbers assigned to a unique chemical substance for example in the case of Propylene Glycol Dicaprylate/Dicaprate, this substance has two CAS nos. ie-68583-51-7 & 58748-27-9? Why is it so? CAS No is a unique number assigned to a specific substance right..
Hi, i am interested to know how to register our products/ company for CAS Number :- and how long will take to procee, is it free or we to paid?
2. Are we able to use our supply CAS Number for our products if we are useing for our products?
If CAS number is same for different INCI name, can I regard those as the same material?
hi. thanks for your good informations.i have qustion. do it may one cas number belong to two forms of a material?? Other words i bought liquid bisphenol a with cas 239658 , later i povided another solid one with same cas number??
Is this possible? Please guide me.
i have observed the dobutamine hydrochloride has two CAS no. can anyone tell me y ? and which one is correct one
Can a IUPAC name be generated from CAS number?
Thanx to dear mam
Thank you for the article.
As I am not a chemist, I would like to ask if there possible to have Cas Numbers in the formt of yy-z (no x) or x-yy-z (only one x)
Many thanks in advance
Dimitris Hantzaras
Thanks a lot its really a good site……………
WHAT IS THE CAS NUMBER FOR THE PRODUCT : IGASOL EMULSION BA ?? PLS REPLY TO