NOVELTY - A blowing agent comprises at least one fluoroalkene; and at least one adjuvant which may be a coblowing agent, surfactant, polymer modifier, toughening agent, colorant, dye, solubility enhancer, rheology modifier, plasticizing agent, flammability suppressant, antibacterial agent, viscosity reduction modifier, filler, vapor pressure modifier, nucleating agent, and/or catalyst.    USE - The blowing agent is used in foamable and/or foaming composition used for making foam, which may be in the form of block, slab, laminate, rigid foam, open cell foam, closed cell foam, flexible foam, integral skin foam, refrigerator foam, or freezer foam (claimed). It is useful in heat transfer systems such as refrigeration systems.    ADVANTAGE - The compound (I) is effective, and exhibits a highly desirable low level of toxicity compared to other compounds. The blowing agent has a Global Warming Potential (GWP) of not greater than 150, and Ozone Depleting Potential (ODP) of not greater than 0.05. The foam has a k-factor KFactor (BTU in/hour ft 2 degrees F) at 40 degrees F of not greater than 0.14 (preferably not greater than 0.16), and compressive strength of at least 12.5% yield in the parallel direction and perpendicular directions.    DETAILED DESCRIPTION - A blowing agent comprises at least one fluoroalkene of formula (I); and at least one adjuvant selected from coblowing agent(s), surfactant(s), polymer modifier(s), toughening agent(s), colorant(s), dye(s), solubility enhancer(s), rheology modifier(s), plasticizing agent(s), flammability suppressant(s), antibacterial agent(s), viscosity reduction modifier(s), filler(s), vapor pressure modifier(s), nucleating agent(s), and/or catalyst(s).    XCF zR 3-z (I)    X=1-5C unsaturated, substituted or unsubstituted radical;    R=Cl, F, Br, I or H;    z=1-3    If Br is present in the compound (I) then the compound includes no hydrogen.    INDEPENDENT CLAIMS are also included for:    (1) foamable composition comprising a foam forming agent and the inventive blowing agent (I);    (2) foam premix composition comprising polyol and the inventive blowing agent;    (3) forming a foam comprising adding to a foamable and/or foaming composition the inventive blowing agent; and    (4) foam comprising polymeric cells and a composition contained in at least one of the cells.