Key statement: An elastomeric composition incorporating a hydrocarbon polymer modifier including piperylene, cyclic pentadiene and aromatic components, and having a softening point from 80[degrees]C to 160[degrees]C, z-average molecular weight greater than 10,000, and at least 1 mole percent
aromatic hydrogen, based on the total moles of hydrogen in the modifier.
Lankford and Nimitz said that a refrigerant they designated R-12A (a near azeotropic blend of 13 mole percent
CF3I and 87 mole percent
HFC-152a) was put in service in a small R-12 instrumental refrigerator, without an oil change, and run for more than 1,500 hours without any apparent problems.