| Properties of refrigerant oils |
| The most important properties are high solubility in refrigerants, good lubrication characteristics, freedom from acid and very low water content. On these grounds only very specific oils can be used; see → Rep. gr.87 for a listing of approved refrigerant oils and charge quantities. |
| The PAG oils suitable for refrigerant R134a are strongly hygroscopic and are immiscible with other oils. Therefore, opened containers should be closed again immediately to protect them from moisture. Refrigerant oils age under the influence of moisture and acids; they become dark, viscous and aggressive towards metals. |
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| For refrigerant circuits with refrigerant R134a, use only the oil approved for the air conditioner compressor. (See → Rep. gr.87 for charge quantities). |
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