Umnyango womlilo ojwayelekile waseMelika unesilinganiso sokumelana nomlilo semizuzu engu-120, futhi ingaphakathi ligcwele ibhodi eliyinhloko lomnyango womlilo we-perlite. Iqabunga lomnyango lenziwe ngepuleti lensimbi, ipuleti lensimbi engagqwali, kanye nepuleti lensimbi elivalwe ngefilimu. Iminyango yomlilo ejwayelekile yaseMelika isetshenziswa eNyakatho Melika nakwamanye amazwe nezifunda eziqaphela amazinga e-UL.