Thumba lapansi lathyathyathya ndiye chisankho chodziwika kwambiri pamoyo watsiku ndi tsiku.
OPP, PET, aluminiyamu, kapangidwe ka PE. Mawonekedwe ake ndiabwino kwambiri pawiri, kung'ambika kwamphamvu, kung'ambika kosavuta kumayendedwe onse ofukula komanso opingasa pambuyo popanga thumba, kutentha kotsika kosindikiza, koyenera kulongedza mwachangu kwambiri, kupewa kusokoneza kwa okosijeni, ultraviolet ndi zinthu zina.