A 
polyol pre-mix composition includes a 
blowing agent having a halogenated hydroolefin, a 
polyol, a surfactant, a catalyst composition, and a 
metal salt. The 
metal salt may be, for example, a 
carboxylate, acetylacetonate, alcoholate of a 
metal selected from the group consisting of Zn, Co, Ca, and Mg. The metal salt may be, for example, a 
carboxylate and / or alcoholate of a C1-C21 
straight chain or branched aliphatic monocarboxylic acid or monoalcohol, such as 
magnesium formate, 
zinc octoate, 
calcium octoate, 
cobalt octoate, and 
magnesium octoate, and mixtures thereof. The metal acetylacetonate may be, for example, 
zinc acetylacetonate, 
cobalt acetylacetonate, 
magnesium acetylacetonate, or 
calcium acetylacetonate. A two-part 
system for producing a thermosetting foam blend includes (a) a polyisocyanate and, optionally, one or more 
isocyanate compatible raw materials; and (b) the 
polyol pre-mix composition. A method for producing a thermosetting foam blend includes combining: (a) a polyisocyanate; and (b) the polyol pre-mix composition.