1 Tasi-vaega, faigofie ona faʻaoga, o oloa gaosia e ala faʻapitoa faʻasologa ma faʻagasologa e lelei le mautu i le vevela o le -40 ℃ ~ 230 ℃;
2 E le faʻamalolo, e le faʻaleagaina i uʻamea, tioata ufiufi, sima, maamora, maamora ma isi mea, faʻaaogaina lautele;
3 E mafai ona tatalia nisi deformation ma plasticity;
4 UV tetee, ozone tetee, vai tetee, vailaau kemikolo;
5 E le o iai so'o se vaifofo, saogalemu ma fa'alelei le si'osi'omaga;
6 Faigofie ona fa'aoga ma fa'asaoina mea;
7 O le ola tautua e sili atu i le 20 tausaga e mafai ona tumau mo se taimi umi.