I have an old black cooling hose(part of car cooling system)which made by general motors at around the years 1988-1990.
I know that cooling hoses can be made from silicone,epdm,neoprene and butyl rubber.
At those years.i don't think that GM used silicone rubber for coolant hoses and i am not sure about epdm.
So,i think that the coolant hose made from neoprene or butyl rubber.
Is there any quick test,without special equipment or special materials,which i can identify if the coolant hose made of neoprene or butyl rubber?
Thank in advance.