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 1, 800 g / mol and a 10 % polyoxyethylene content ).
