NOVELTY - A heat-transfer composition (A) comprises 51-59 wt.% trans-1,3,3,3-tetrafluoropropene (R-1234ze(E)) and 41-49 wt.% 1,1,1,2-tetrafluoroethane (R-134a).    USE - Heat-transfer composition is used for lubricant composition, stabilizer composition, flame retardant composition, heat-transfer device e.g. refrigeration device, automotive air conditioning system, residential air conditioning system, commercial air conditioning system, residential and commercial refrigerator systems, residential and commercial freezer systems, chiller air conditioning and refrigeration systems, and commercial and residential heat pump systems, mechanical power generation device, gaseous dielectrics, cryosurgery, veterinary procedure, dental procedure, fire extinguishing application, flame suppression, solvent, cleaner, air horn, pellet gun, topical anesthetic application and expansion application, and used for cooling article, heating article, extracting substance from biomass, cleaning article, extracting material from aqueous solution or particulate solid matrix, retrofitting heat-transfer device, reducing environmental impact caused by operation of product comprising existing compound or composition and generating greenhouse gas emission credit (all claimed).    ADVANTAGE - The nontoxic and non-flammability heat-transfer composition has low global warming potential, high stability and refrigeration capacity, excellent corrosion resistance, and is prepared by simple and environmentally-friendly process.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) lubricant composition (B), which comprises a lubricant and the composition (A);    (2) stabilizer composition (C), which comprises a stabilizer and the composition (A);    (3) flame retardant composition (D), which comprises a flame retardant and the composition (A);    (4) heat-transfer device, which comprises heat-transfer composition (A);    (5) blowing agent, which comprises composition (A), (B), (C) or (D);    (6) foamable composition, which comprises component(s) capable of forming foam and the composition (A), (B), (C) or (D). The component(s) capable of forming foam is polyurethane, thermoplastic polymer, polystyrene and/or epoxy resin;    (7) foam, which is obtained using the foamable composition;    (8) sprayable composition, which comprises material to be sprayed, and a propellant comprising the composition (A), (B), (C) or (D);    (9) method for cooling article, which involves condensing the composition (A), (B), (C) or (D) and evaporating the composition in the vicinity of the to-be-cooled article;    (10) method for heating article, which involves condensing the composition (A), (B), (C) or (D) in the vicinity of to-be-heated article and evaporating the composition;    (11) method for extracting substance from biomass, which involves contacting biomass with a solvent comprising the composition (A), (B), (C) or (D), and separating the substance from the solvent;    (12) method for cleaning article, which involves contacting article with the solvent comprising composition (A), (B), (C) or (D);    (13) method for extracting material from aqueous solution or particulate solid matrix, which involves contacting the aqueous solution or the particulate solid matrix with the solvent comprising composition (A), (B), (C) or (D), and separating the material from the solvent;    (14) mechanical power generation device, which comprises the composition (A), (B), (C) or (D);    (15) method for retrofitting heat-transfer device, which involve removing existing heat-transfer composition, and introducing the composition (A), (B), (C) or (D);    (16) method for reducing environmental impact caused by operation of product comprising existing compound or composition, which involves replacing an existing compound or composition with composition (A), (B), (C) or (D);    (17) preparation of composition (A), (B), (C) or (D), which involves introducing R-1234ze(E), and optionally lubricant, stabilizer and/or flame retardant, into heat-transfer device containing existing heat-transfer fluid which is R-134a; and    (18) method for generating greenhouse gas emission credit, which involves replacing existing compound or composition with the composition (A), (B), (C) or (D) having global warming potential less than the existing compound or composition.