The Castrol Aircol SW range of synthetic refrigeration lubricants are formulated from polyolester base stocks.

They are specifically designed for use with refrigeration systems using environmentally friendly HFC refrigerants, in particular R134a.

The synthetic base stocks used in the Aircol SW range are fully miscible with HFCs, in particular R134a, even at temperatures well below the minimum likely to be encountered in service.
The Aircol SW grades have been formulated to enhance hydrolytic stability, load carrying and inhibition against copper plating. They are wax free and hence have very low pour points. This ensures the evaporator remains clean (consequent efficient heat transfer) and reduces the risk of pipe blockages.

Name Method Units SW 32 SW 46 SW 68 SW 100 SW 170 SW 220
Density @ 20°C / 68°F ISO 12185 / ASTM D4052 kg/m³ 977 980 980 969 968 975
Base Oil Viscosity @ 40°C / 104°F ISO 3104 / ASTM D445 mm²/ s 32 46 68 100 170 220
Base Oil Viscosity @ 100°C / 212°F ISO 3104 / ASTM D445 mm²/ s 5.4 6.9 8.5 11.4 17 19
Pour Point ISO 3016 / ASTM D97 °C/°F -46/-50.8 -42/ -43.6 -39/ -38.2 -30/-22 – 27/ -16.6 – 27/ -16.6
Flash Point – closed cup method ISO 2719 / ASTM D93 °C/°F 233/ 451.4 235/455 245/473 235/ 455 235/455 250/482
Subject to usual manufacturing tolerances.

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