Set of 10 calibration standards, 500mg each, for organic SEC. Less branched polystyrene with anionic polymerization. Soluble in tetrahydrofuran (THF), chloroform, toluene, and o-dichlorobenzene (ODCB). The 10 MW included are: 1,180; 3,320; 6,250; 17,100; 49,400; 129,000; 298,000; 607,000; 1,570,000; 3,210,000. NOTE: Actual molecular weights may vary slightly depending on production lots. Refer to the COA for exact weights for the specific lot.