49 CFR 172 Special Provision IB2 (IB-Codes and IP-Codes)
These provisions apply only to transportation in IBCs and Large Packagings.
Code
IB2
Description
Authorized IBCs: Metal (31A, 31B and 31N);
Rigid plastics (31H1 and 31H2); Composite
(31HZ1). Additional Requirement: Only liquids with a
vapor pressure less than or equal to 110 kPa
at 50 [deg]C (1.1 bar at 122 [deg]F), or 130
kPa at 55 [deg]C (1.3 bar at 131 [deg]F) are
authorized.