Isikhwama sesanti isikhwama noma isaka elenziwe nge-polypropylene noma ezinye izinto eziqinile ezigcwaliswa ngesihlabathi noma inhlabathi futhi zisetshenziselwe izinjongo ezinjengokulawula izikhukhula, ukuqinisa amasosha emiseleni nasezindlini, ukuvikela amafasitela ezingilazi ezindaweni zempi, i-ballast, i-counterweight, kanye ezinye izinhlelo zokusebenza ezidinga ukuqiniswa kweselula, njengokungeza isivikelo esengeziwe esithuthukisiwe ezimotweni zezikhali noma amathangi.