*To increase reactivity, substitute D.E.H. 84 for the 1:2 blend of D.E.R. 664U/- D.E.H. 84/85 at whatever level is necessary. D.E.R. 663/- D.E.R. 642U/67 Modaflow Powder II/1.5 Physical Properties phr of a 1:2 blend D.E.H. 84/85/47.0 D.E.H. 84/85/10.5/ Hot Plate Gel Time @ 200 C (s)/60 D.E.R. 663U/- D.E.R. 662/- (1:2) Blend*/21.0