Tris(also known asTHAM) is an abbreviation of tris(hydroxymethyl)aminomethane, with the formula (HOCH2)3CNH2. Tris buffer is extensively used proteomics and genomics applications.A common biological buffer with many applications in molecular biology.Ultra Pure Grade Technical Information:Insolubles: <0.001%pH (0.1M, water): 4.2-4.9Lead: <0.001%Iron: <0.001%Copper: <0.0001%Magnesium: <0.0001%Calcium: <0.0001%Zinc: <0.0001%Storage: RTHS Code : 29221980PH Value: 7.0 - 9.0