TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The composition (C1) further comprises a lubricant, stabilizer and an additional flame retardant. (C1) comprises Z isomer of R-1225ye; R-32, R-161 or R-152a; and at least one further refrigerant selected from carbon dioxide (R-744), fluoromethane (R-41); fluoroethane (R-161), 1,1,1 -trifluoroethane (R-143a), 1,1,1,2-tetrafluoroethane (R-134a), 1,1,2,2-tetrafluoroethane (R-134), dimethyl ether, heptafluoropropane (R-227ea), propane (R-290), propene (R-1270), isobutane (R-600a), n-butane (R-600), 2,3,3,3-tetrafluoropropene (R-1234yf), 1,1-difluorocyclopropane, 1,1,2-trifluorocyclopropane, 1,1,2,2-tetrafluorocyclopropane, pentafluorocyclopropane, pentafluoroethane (R-125) and/or ammonia. The R-32, R-161 or R-152a is R-32. (C1) comprises (parts) Z isomer of R-1225ye, R-32, R-125 and R-161 or R-152a; Z isomer of R-1225ye, R-152a, and R-125; Z isomer of R-1225ye, R-161 and R-134a; Z isomer of R-1225ye, R-161 and R-125; Z isomer of R-1225ye, R-125 and R-32; R-125 (1-3), R-152a (1-12) and Z isomer of R-1225ye (85-98); R-125 (1-4), R-161 (1-4) and Z isomer of R-1225ye (92-98); R-161 (1-4), R-134a (1-10) and Z isomer of R-1225ye (86-98); R-32 (1-3), R-125 (1-3), R-152a (1-13) and Z isomer of R-1225ye (81-97); R-132 (1-3), R-125 (1-3), R-161 (1-5) and Z isomer of R-1225ye (89-97); R-32 (1-9), R-134a (4-8), R-1234yf (4-44) and Z isomer of R-1225ye (48-89); R-32 (3-9), R-134a (4-8), R-1234yf (4-28) and Z isomer of R-1225ye (55-88); R-32 (4-9), R-134a (4-6), R-1234yf (4-24) and Z isomer of R-1225ye (73-88); R-32 (1-4), R-134a (4-8), R-1234yf (4-44) and Z isomer of R-1225ye (48-89); R-32 or R-161 (5-7), (preferably R-32 (6-8)), R-134a or R-125 (preferably R-134a) and Z isomer of R-1225ye (86-88); R-32 (2-5), R-125 (2-5), R-161 (2-6) and Z-isomer of R-1225 ye (84-94); R-32 (2-4), R-125 (2-4), R-152a (10-13) and Z-isomer of R-1225ye (79-86); or R-161 (2-4), R-125 (2-4), and Z-isomer of R-1225ye (92-96). R-1225ye comprises Z isomer (at least 80, preferably 95, especially 98)%. (C1) has a capacity greater than R-1225ye and/or its Z-isomer. The mass ratio of R-32 to Z isomer of R-1225ye is 0.2-0.35:1 (preferably less than 0.25:1, especially 0.15:1, particularly 0.07:1). Preferred Components: The refrigerant is R-134a or R-125 (preferably R-134a). The lubricant is selected from mineral oil, silicone oil, polyalkyl benzenes, polyol esters, polyalkylene glycols, polyalkylene glycol esters, polyvinyl ethers and/or poly(alpha-olefins). The stabilizer is selected from diene-based compounds, phosphates, phenol compounds and/or epoxides. The additional flame retardant is selected from tri-(2-chloroethyl)-phosphate, (chloropropyl)phosphate, tri-(2,3-dibromopropyl)-phosphate, tri-(1,3-dichloropropyl)-phosphate, diammonium phosphate, various halogenated aromatic compounds, antimony oxide, aluminum trihydrate, polyvinyl chloride, fluorinated iodocarbon, fluorinated bromocarbon, trifluoroiodomethane, perfluoroalkyl amines and/or bromo-fluoroalkyl amines.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The component capable of forming foam is selected from polyurethanes, thermoplastic polymers and resins such as polystyrene and/or epoxy resins. EXAMPLE - No suitable example given.