Butanes for undergoing a specific process as defined in additional note 5 to chapter 27, liquefied (excl. of a purity of > 95% of nbutane or isobutane)
Butanes for undergoing chemical transformation, liquefied (excl. for specific processes specified in additional note 5 to chapter 27 and butanes of a purity of > 95% of nbutane or isobutane)