Bohloeki ba moea ke mofuta oa maemo a machabeng a sebelisoang ka phaposing e hloekileng. Hangata etsa liteko tse hloekileng tsa phaposi le ho amoheloa ho ipapisitsoe le boemo bo se nang letho, bo tsitsitseng le bo matla. Botsitso bo tsoelang pele ba bohloeki ba moea le taolo ea tšilafalo ke maemo a mantlha a boleng bo hloekileng ba phaposi. Tekanyetso ea lihlopha e ka aroloa ka ISO 5 (Class A / Class 100), ISO 6 (Class B / Class 1000), ISO 7 (Class C / Class 10000) le ISO 8 (Class D / Class 100000).