SF20 still appears to be an 'SAE 20' viscosity fork oil.
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"Description:
Silkolene SF 20 Monograde Fork & Suspension Fluid
Silkolene SF 20 is a monograde SAE 20 fork and suspension fluid featuring a high VI index formulation. It combats friction, protects seals, resists corrosion and ensures smooth suspension under all road and competition conditions. Grades can be mixed.
Silkolene's SF range are based on highly refined base oils and advance performance additives to provide optimum damping and consistent smooth fork action for road going machines and those requiring heavier base oils."