Ka whakamahia te hua Mid-pressure mo te kawe me te rokiroki o nga taonga matū, penei i te hau hinu paitini, te haukini anhydrous, propylene, butadiene, isobutene, dimethyl eter me etahi atu taonga matū, e nui ana te rōrahi, te taumaha māmā me te tere o te uta & te utaina reiti