[jedizeus]

i am asked about to making polyurethane foam with weight ratio, polyol (1) : MDI (1.1) with 0.5% of CNT filler.
Total weight is 220g.
0.5% of CNT = 1.1g, the remaining weight = 218.9g
weight of polyol= (1/2.1) x 218.9 = 104.24g
weight of MDI = (1.1/2.1) x 218.9 = 114.66g
But then our instructor ask us to do calculation in Part Per Hundred Resin( phr )
let the polyol = 100phr and MDI = 110phr,

my question is how to do calculate the phr of CNT filler?

[pgk]

Usually in industrial language, “phr of filler” refers to the mass percentage of filler per mass of pure resin.
But I cannot be sure, if your instructor means exactly that. So, ask him again.