Tubing Material Selection

Note: Per EIGA Oxygen Pipeline and Piping Systems all common metallics are safe for use in systems with Nitrous. Thus propellant compatibility is not a concern. 3.1ksi ish 1/2” OD piping is what we’re looking at

	Soft Metals (Copper, Brass)	Aluminum	Carbon Steel	Stainless Steel (Seamless)

	Soft Metals (Copper, Brass)	Aluminum	Carbon Steel	Stainless Steel (Seamless)
Cost Tube Flarer	$100	$42.90 6ft		$52.62 6ft
Workability		Dissimilar metals can be a concern given that fittings are generally steel.		Very difficult to work.
All Materials work for Ethanol and N2o	Brass is more corrosion resistance than aluminum All can oxidize and have debris	Aluminum oxide is a debris in the system	More susceptible to rust	resistance to corrosion
Thermal Compatibility	-100*F copper	-270*F	(-50* F - 800*F)	(-50* F - 800*F) Mechanical Properties at Cryogenic Temperatures - Penflex
Pressure Comparability	Copper goes up to 1.5ksi. Brass goes up to 2.2ksi TOO LOW	@ 3.3 ksi	Can corrode very easily due to oxidizer.	3.2 ksi

McMaster-Carr