Weelka waxaa badanaa laga sameeyaa qalabyo xinjiyin tayo sare leh sida xumbada polyurethane ee loo yaqaan 'polyurethane xukunka' polyurethane laam '.
Gaar ahaan loogu talagalay samadaha bayoolojiga ee u baahan in si joogto ah loo keydiyo, taxanaha la qaadan karo waa haanta yar ee dareeraha ah ee dareeraha ah.
