Chromatography Forum

can someone help me out. I would like to know more about chemical grades such as EP, GR, CP, KP, BP, HPLC, USP, NF,. What do they exactly mean, I understand that they are different grades but does it mean that for example EP is better than GR? Or are these grades used for different techniques? If someone is requesting for ACS grade however you have EP grade, is there any difference, however the MP, BP, the density happens to be the same of ACS and EP grade solvents??

Where exactly i.e which techniques are they used for? Can i expect them to be used in all labs? What kind of labs? Chemical labs in cement plants, water testing, steel testing, oil testing?? Would they go for such chemicals??

EP, BP and USP: European Pharmacop., British and US Pharmacop. means that the solvent or chemicals can be used for drug manufacturing and is tested with QC methode abroved by the different organisations.
HPLC means that this solvent should be used in HPLC analysis while it is clean and will not give any unexpected peaks or additional baseline noise. Different industries have different requirements for different analytical methods. And highest purity of a chemical or solvent means also higher price. It all depends what you want to do.

Are GR reagents better than ACS? Or are they the same.