BS EN 17375:2020 pdf free.Electronic cigarettes and e-liquids -Reference e-liquids. BS EN 17375 4.3.1 To perform tests, there are two reference e-liquids (see 4.3.2 and 4.3.3) and their composition is described in 4.3.4. 4.3.2 A reference e-liquid, termed 70/30, which contains propylene glycol (PG) (4.2.1) and glycerol (vegetable glycerine) (VG) (4.2.2) in a ratio of 7:3 respectively.4.3.3 A reference e-liquid,...