FYI on methanol/ethanol safe materials.

[jastrckl]

(thought it might come in handy)

O-Ring Materials Compatible with Ethanol
(select a material to show its compatible chemicals)
Aflas (0) Buna-N (Nitrile) (4) Butyl (4)
Chemraz (4) Epichlorohydrin (4) Ethylene-Propylene (4)
Fluorocarbon (4) Fluorosilicone (4) Hypalon (4)
Kalrez (4) Natural Rubber (4) Neoprene (4)
Nitrile, Hydrogenated (4) Polyacrylate (1) Polysulfide (4)
Polyurethane, Cast (0) Polyurethane, Millable (1) Silicone (3)
Styrene Butadiene (4) Teflon, Virgin (4) Vamac (0)

O-Ring Materials Compatible with Methanol
(select a material to show its compatible chemicals)
Aflas (0) Buna-N (Nitrile) (3) Butyl (1)
Chemraz (4) Epichlorohydrin (0) Ethylene-Propylene (4)
Fluorocarbon (0) Fluorosilicone (4) Hypalon (4)
Kalrez (4) Natural Rubber (4) Neoprene (4)
Nitrile, Hydrogenated (4) Polyacrylate (3) Polysulfide (0)
Polyurethane, Cast (0) Polyurethane, Millable (2) Silicone (4)
Styrene Butadiene (0) Teflon, Virgin (4) Vamac (4)

from efunda.com