Qhov tsim hluv ib qhov chaw yog ib qhov khoom siv tshuaj lom neeg tsim, feem ntau yog ib qhov chaw tsim los ntawm polymer, tsim los rau kev xa mus rau hauv ib qho chaw siv metal—feem ntau tshaj plaws yog aluminum lossis steel cov ntug, cov khaub, cov kab rooj xab, thiab cov bracket pheej yig—los txo dej nkhaus. Nws ua hauj lwm ib qhov chaw kis tes nyob hauv ib qhov chaw kis tes, sau tus ntim metal ntawm hauv thiab sab nraum outside kom tsis txaws dej nkhaus tuaj. Cov thermal break profile tseem ceeb tshaj plaws thiab feem ntau tshaj plaws yog tsim los ntawm polyamide 66 muaj rooj zaum (PA66 GF25 lossis GF30), ib qhob khoom uas tau xa mus rau nws lub zog meej meej thiab zog tshaj plaws, suav nrog zog tso tawm thiab zog tsho, kom tuaj yeem tiv thaiv kev puas tsuaj los ntawm cov metal thiab kev pheej yig. Lub duab ntawm qhov profile yog tsim los ntawm kev kho mob tsis yog ib txwm zoo heev rau kev kis tes, tab sis tseem rau kev nyob ib leeg nrog cov metal. Nyob rau hauv cov systems aluminum, qhov no feem ntau tau muab los ntawm "pour and debridge" kev tsim, qhov polyamide tau muab mus rau hauv ib qhov chaw rai nyob hauv aluminum thiab tom qab ntawd ib qhov chaw aluminum tau muab tshem tawm, lossis los ntawm "roll-in" kev tsim, qhov metal tau muab ntxuav mus rau hauv qhov polymer. Qhov kev ua hauj lwm ntawm ib qhov thermal break profile yog muab ntaus nqi los ntawm nws kev pab txo qhov linear thermal transmittance (Psi-value) ntawm tag nrho qhov chaw, pab tiv thaiv U-value txo rau cov ntug lossis khaub. Tom qab energy efficiency, nws tiv thaiv kev condensation nyob rau hauv cov khoom siv, pab tiv thaiv kev nyab xeeb los ntawm kev tshem tawm qhov chaw kis, thiab yog ib qhov tseem ceeb rau kev txhawis cov kev cai tseem ceeb hauv tsev thiab cov certification zoo li Passive House, LEED, thiab BREEAM. Qhov kev tsim, kev xaiv khoom, thiab kev tsim khoom ntawm qhov thermal break profile yog ib qhov tseem ceeb rau kev pab tau rau ib qhov fenestration lossis building envelope system.