Poly(vinyl formal), in one of the forms from note 6(b), of a molecular weight of >= 10.000 but <= 40.000, containing by weight >= 9,5% but <= 13% of acetyl groups evaluated as vinyl acetate and >= 5% but <= 6,5% of hydroxy groups as vinyl alcohol
Poli (vinilformal) molekulske mase 10.000 do 40.000