TECHNOLOGY FOCUS - POLYMERS - Preferred Polyol: The aromatic amine-based polyol is a toluene diamine-based polyol.Preferred Amount: The sucrose-based polyol is present at 60-85 wt.%, preferably 50-62 wt.%, and the toluene diamine-based polyol is present at 40-15 wt.%, preferably 13-35 wt.% (based on total weight).Preferred Hydroxyl Number: The diaminodiphenylmethane-based polyether polyols have a hydroxyl number of 295-325 mg KOH/g and the toluene diamine-based polyols have a hydroxyl number of 350-810 mg KOH/g and a functionality of 3.7-4. The sucrose-based polyether polyol has a functionality of 4.2-4.8.Preferred Reaction System: The reaction system further comprises glycerine-initiated polyether polyol with a hydroxyl value of 53-57 mg KOH/g. Diaminodiphenylmethane-based polyol is 12-20% based on total weight of isocyanate-reactive compounds. The reaction system preferably comprises 41 parts sucrose based polyether polyol with 420-480 mg KOH/g hydroxyl number, 13.6 parts diaminodiphenylmethane-based polyether polyol with 295-325 mg KOH/g, 23.9 parts toluene diamine-based polyol with 375-405 mg KOH/g, 3.4 parts glycerine-initiated polyol with 53-57 mg KOH/g, 1.8 parts silicone surfactant, 1.2 parts pentamethyldiethylenetriamine, 0.5 parts 1,3,5-tris(3-(dimethylamino)propyl) hexahydro-s-triazine, 1.3 parts water and 13.3 parts cyclopentane.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Blowing Agent: The hydrocarbon blowing agent is cyclopentane, isopentane, n-pentane, neopentane, n-butane, cyclobutane, methylcyclobutane, isobutane, propane, cyclopropane, methylcyclopropane, n-hexane, 3-methylpentane, 2-methylpentane, cyclohexane, methylcyclopentane, n-heptane, 2-methylhexane, 3-ethylpentane, 2,2,3-trimethylbutane, 2,2-dimethylpentane, cycloheptane, methylcyclohexane, 2,2-dimethylbutane or 2,3-dimethylbutane. It is preferably cyclopentane (especially), isopentane, n-pentane or their mixtures.Preferred Reaction System: The reaction system further comprises a physical blowing agent selected from dialkyl ethers, alkyl alkanoates, aliphatic hydrofluorocarbons, cycloaliphatic hydrofluorocarbons, hydrochlorofluorocarbons, fluorine-containing ethers, water and carbon dioxide.Preferred Catalyst: The catalyst is pentamethyldiethylenetriamine, dimethyl cyclohexylamine, 1,3,5-tris(3-(dimethylamino)propyl) hexahydro-s-triazine, tin (II) acetate, tin (II) octanoate, tin (II) ethylhexanoate, tin (II) laurate, dibutyltin diacetate, dibutyltin dilaurate, dibutyltin maleate or dioctyltin diacetate. EXAMPLE - 41 wt.% Rubinol R180, 13.6 wt.% Rubinol R144, 23.9 wt.% Rubinol XR124, 3.4 wt.% Rubinol F455, 1.8 wt.% Tegostab B8461, 1.2 wt.% Polycat 5, 0.5 wt.% Polycat 41, 1.3 wt.% water and 13.3 wt.% cyclopentane were mixed to prepare sucrose based polyol blends. Amounts of polyisocyanate and polyol blends were reacted to form polyurethane foam, preferably rigid polyurethane foams. The foams were manufactured by known methods such as one-shot, prepolymer or semi-prepolymer techniques. The rigid foam could be in the form of slabstock, molding, cavity fillings, sprayed foam, frothed foam or laminates with materials such as hardboard, plasterboard, plastics, paper or metal.