Ngenxa yokumuncwa komswakama okungokwemvelo kwekhabhoni emnyama, i-PE ehlanganisiwe emnyama izwela umswakama. Isikhathi eside sokulondoloza noma indawo yokugcina eqinile izokwandisa umswakama. Ngaphansi kwezimo ezijwayelekile nezinhlelo zokusebenza, sincoma ukushisa kwangaphambili okungenani ihora elingu-1 kanye nezinga lokushisa eliphakeme elingu-90 °C.