a. When used for purposes such as sterilization, inner packagings of peroxyacetic acid, stabilized, classified as UN 3107 Organic peroxide type E, liquid or UN 3109 Organic peroxide type F, liquid may be fitted with a vent consisting of hydrophobic membrane, provided:
(1) Each inner packaging contains not more than 70 mL;
(2) The inner packaging is designed so that the vent is not immersed in liquid in any orientation;
(3) Each inner packaging is enclosed in an intermediate rigid plastic packaging with a small opening to permit release of gas and contains a buffer that neutralizes the contents of the inner packaging in the event of leakage;
(4) Intermediate packagings are packed in a fiberboard box (4G) outer packaging;
(5) Each outer packaging contains not more than 1.4 L of liquid; and
(6) The rate of oxygen release from the outer packaging does not exceed 15 mL per hour.
b. Such packages must be transported on cargo aircraft only. The requirements of §173.24 and §173.27 do not apply.