Cov pwm los yog tuag tuag yog hais txog cov cuab yeej siv los ua cov yas hauv molding. Kev hloov tshuaj pwm tuaj yeem tau tsim cov khoom kim heev thiab tau tsuas yog siv cov ntaub ntawv sau ntau cov ntaub ntawv uas muaj ntau txhiab qhov tau ua. Pwm txwv feem ntau yog tsim los ntawm lub yeeb nkab ntawm steel, pre-hardened steel, txhuas, thiab / los yog beryllium-tooj liab alloy. Qhov kev xaiv ntawm cov ntaub ntawv tsim kom muaj pwm los ntawm yog qhov ib feem ntawm kev lag luam. Cov pwm phom feem ntau yog tus nqi ntau dua los ua ib qho tiam sis muab lub neej ntev ntev uas yuav ua kom tus nqi pib dua tus nqi ntau dua ntawm cov khoom ua ntej hnav tawm. Pre-hardened molds yog tsawg hnav resistant thiab yog primarilly siv rau cov ntim qis dua los yog cov khoom loj dua. Lub zog ntawm cov cua ua ntej yuav ntsuas feem ntau 38-45 ntawm Rockwell-C scale. Cov hlau pwm hardened yog cua sov tom qab ua haujlwm, ua rau lawv siab dua coj hnyav thiab kev ua neej. Kev kub nyhiab feem ntau yog nruab nrab ntawm 50 thiab 60 Rockwell-C (HRC).
Aluminium molds tus nqi ntau dua li cov hlau pwm, thiab thaum qib siab txhuas xws li QC-7 thiab QC-10 aircraft aluminium yog siv thiab machined nrog cov khoom siv niaj hnub, lawv tuaj yeem ua lag luam rau moulding pua pua txhiab qhov. Aluminium molds kuj muab ceev turnaround thiab sai cycles vim zoo dua heat dissipation. Lawv tseem tuaj yeem tiv thaiv kev hnav cev rau cov khoom fiberglass reinforced. Beryllium tooj liab siv nyob rau thaj chaw ntawm cov pwm uas yuav tsum tau ceev hluav taws xob tshem tawm lossis cov cheeb tsam uas pom cov cua kub tshaj plaws.