sentences:  P407 = poloxamer with a polyoxypropylene molecular mass of 4000 g/mo} and a 70% polyoxyethylene content).For the Pluronic and Synperonic tradenames, coding of these copolymers starts with a letter to define its physical form at room temperature (L = liquid, P = paste, F = flake (solid)) followed by two or three digits, The first digit (two digits in a three-digit number) in the numerical designation, multiplied by 300, indicates the approximate molecular weight of the hydrophobe; and the last digit x 10 gives the percentage polyoxyethylene content (e.g., L61 indicates a polyoxypropylene molecular mass of 1800 g/mol and a 10% polyoxyethylene content).In the example given, poloxamer 181 (P181) = Pluronic L61 and Synperonic PE/L 61.