Silicone is insoluble in water and any solvent, non-toxic and odorless, with stable chemical properties, and does not react with any substances other than strong bases and hydrofluoric acid.
Alcohol is a colorless, transparent, volatile, flammable, and non-conductive liquid. When the alcohol concentration is 70%, it has a strong bactericidal effect on bacteria.
Therefore, some medical silicone rubber seals that require FDA certification are generally disinfected and stored at high temperatures with alcohol or physiological saline.
It can be seen that alcohol will not corrode the silicone rubber sealing ring and will not cause any damage to the silicone rubber sealing ring.
About Silicone rubber,Please check:
High Strengh Liquid Silicone Rubber IOTA 28-Series 
