*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. 663/35.5 D.E.R. 642U/35.5 Modaflow Powder II/1.5 Physical Properties phr of a 1:2 blend D.E.H. 84/85/38.7 D.E.H. 84/85/9.2/ Hot Plate Gel Time @ 200 C (s)/110 D.E.R. 663U/- D.E.R. 662/- (1:2) Blend*/18.3