Vim nws txoj kev siv ntau yam, grammage ntawm tracing ntawv yuav tsum raug xaiv raws li cov kev xav tau tshwj xeeb. Nyob rau hauv lub tshav pob ntawm mechanical drawing, 70-80 g / m² tracing daim ntawv yog tsim nyog.
Yog tias cov grammage qis dua 65 g / m², daim ntawv nyias dhau thiab ua rau wrinkles thaum luam ntawv; hos yog hais tias cov grammage ntau tshaj 80 g / m², daim ntawv yog tuab heev thiab tej zaum yuav ua rau ntawv jams.
