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HC-12a, also called ES-12a, OZ-12a, DURACOOL 12a [1] and Hydrocarbon Blend B, is marketed as a "drop-in" replacement refrigerant for R-12 and other refrigerants. HC-12a is a mixture of hydrocarbons , specifically propane (R-290) and isobutane (R-600a), and is therefore considered nearly non-ozone-depleting.
1,1,1,2-Tetrafluoroethane (also known as norflurane (), R-134a, Klea 134a, Freon 134a, Forane 134a, Genetron 134a, Green Gas, Florasol 134a, Suva 134a, HFA-134a, or HFC-134a) is a hydrofluorocarbon (HFC) and haloalkane refrigerant with thermodynamic properties similar to R-12 (dichlorodifluoromethane) but with insignificant ozone depletion potential and a lower 100-year global warming ...
Mineral oil used with R-12 is not compatible with R-134a. Some oils designed for conversion to R-134a are advertised as compatible with residual R-12 mineral oil. Illegal replacements for R-12 include highly flammable hydrocarbon blends such as HC-12a, the flammability of which has caused injuries and deaths. [10] [11]
12A may refer to: Media content ratings including the following: 12A, a current certificate issued by the British Board of Film Classification; 12A issued by the Irish Film Classification Office; 12A issued in Malta and Nigeria, documented at Motion picture content rating system; A type of Mazda Wankel engine; Any of the several highways ...
“Face paint, helmets and full masks or hoods that obscure the face are prohibited,” the online AMC policy page reads. Similarly, Regal movie theaters enforce the same rules. Show comments
HFO-1234yf has a GWP less than carbon dioxide, [4] [2] itself 1,430 times less potent than R-134a. [5] For this reason, 2,3,3,3‑tetrafluoropropene is the pre-eminent replacement for R-134a in vehicular air conditioners. As of 2022, 90% of new U.S. vehicles are estimated to use HFO-1234yf.
Some studios sought to compensate for these effects by shooting color films with a full aperture gate (rather than the academy aperture) and then reducing the image in Technicolor's optical printer. This process is a predecessor of today's Super 35 format, which also uses a 1.85:1 ratio but one-third more frame area than does a standard 1.85:1 ...
1494, as built, with a Type MP1 tender and running boards dipping down below the cab 1509 with a Type MT tender, Germiston, 7 April 1979 1499 with a modified Type MP1 tender, Sydenham, 16 April 1979 1862 with a Type MR tender, New Brighton, 31 March 1979