Cov yam ntxwv khoom yas
1. Cov khoom yas yog cov thermally nthuav dav, thiab qhov coefficient ntawm linear expansion yog loj dua li ntawm cov hlau;
2. Lub nruj ntawm cov ntaub ntawv yas dav dav yog ib qho kev txiav txim ntawm qhov ntau dua qis dua cov hlau;
3. Cov cuab yeej muaj teeb meem ntawm cov khoom siv yas raw yuav raug txo qis dua hauv cov cua sov ntev;
4. Cov khoom siv yas dav dav yuav hloov kho mus tas li raws li qhov kub tsis txias thiab hauv qab kev ntxhov siab ntawm nws cov zog tawm los, thiab kev hloov kho tas mus li yuav tshwm sim;
5. Cov ntaub ntawv yas yog rhiab rau kis ua rau puas;
6. Cov yam ntxwv ntawm cov khoom siv ntawm cov khoom siv yas yog feem ntau qis dua li cov hlau, tab sis qee cov ntaub ntawv muaj ntau qhov muaj zog thiab cov qauv tshwj xeeb dua li cov hlau. Yog tias cov khoom lag luam tsim nyog, nws yuav zoo dua;
7. Feem ntau, cov khoom siv cav ntawm cov khoom yas yog cov anisotropic;
8. Qee cov ntaub ntawv yas yuav nqus noo noo thiab ua rau qhov ntev thiab qhov ua haujlwm hloov;
9. Cov ntaub ntawv qaug zog ntawm cov khoom siv yas yas tseem tseem tsawg heev ua ntej 2005 thiab xav tau kev txiav txim siab raws li kev siv.