Alaabada loo yaqaan 'Mid-pressure' waxaa loo adeegsadaa gaadiid iyo keydinta walxaha kiimikada, sida gaaska saliida leh, ammonia, propylene, butadiene, isobutene, dimethyl ether iyo waxyaabo kale oo kiimiko ah, oo leh mug weyn, culeys fudud iyo culeys deg deg ah iyo rar deg deg ah heerka.