funnel for re fuelling - does silicon react to petrol

[desert dueler]

saw these funnels in the cooking section at the local PnP. since the fold up lank small i though they would be perfect for the bike when refueling from the jerry.

but will silicone and petrol get along and play nicely?

 

[The Rock]

 

[Sparticus]

 

[Beebop]

 

[Gerard]