Material compatibility- the ability of materials/physical objects in two or more systems or components to perform their required functions while sharing the same hardware or software environment.
Refrigerant compatibility- the medium for heat transfer in a refrigerant system which is able to synchronise with other mediums without degrading or interrupting any other part of the system.
Traction co-efficient- measures the efficiency of power transfer between the two elements.
Pour/floc point- is determined by cooling a mixture of 10% oil and 90% R12 in a sealed tube and is observed to see when a 5 degree increments of cloudiness start to form due to flocculate formation.
Chemical stability- the chemical composition in which it is resistance to change; that is it is neither kinetically stable (reacting extremely slow) or thermodynamically stable (energetically stable).
Dielectric Strength- is a measure of the electrical strength of a material as an insulator. It is also defined as the voltage required producing a breakdown through the material and is expressed as Volts per unit. The higher the dielectric strength of a material the better its quality as an insulator.
Viscosity- is a measure of the resistance of a fluid which is being deformed by either shear stress or extensional stress. It is commonly perceived as "thickness", or resistance to flow.
Miscibility- is a term that refers to the property of liquids to mix in all proportions, forming a homogeneous solution. In principle, the on the solubility of one liquid in another. Water and ethanol, for example, are miscible in all proportions
Hygroscopic- material (literally "water seeking") is one that readily absorbs water (usually from the atmosphere).