Praestantia levis operatio cum excellenti robore
Maxime insignis proprietās microsphaerārum expansārum ad spātulam in eō consistit quod mirificē levis esse possunt simul atque praestantem robur mechanicum retinent. Haec combinātiō, quae contraria vidētur, ex arte ingeniosa structūrae microsphaerārum oritur, ubi unaquaeque sphaera ex tenuī crustā polyme-rica constat, quae spatium interius vacuum continet, gas plēnum. Haec architectūra unica permittit microsphaerīs expansīs ad spātulam ut densitātem adeant tam levem quam 0,1–0,5 g/cm³, quae rēductiō magnā est cōnferentēs cum traditiōnālibus repletīvīs mineralibus, quorum densitās vulgō 2,5–4,5 g/cm³ est. Magnitūdō huius rēductionis ponderis nōn potest satis aestimārī, praesertim in applicationibus ubi considerātiōnēs oneris structūrālis maximē momentī sunt. Exemplī grātiā, in renovātiōnibus aedificiōrum altōrum, usus microsphaerārum expansārum ad spātulam onus totum applicātum mīllia librarum minuere potest, fortasse evitāns necessitātem refortificātiōnis structūrālis, quae alioquin cum trāditionālibus systemātibus spātulae gravibus requirerētur. Proprietātēs fortitūdinis microsphaerārum expansārum ad spātulam ex eōrum figurā sphaericā oriuntur, quae optimam distributionem stressis sub oneribus compressīvīs praebet. Dissimiliter ā repletīvīs irregularis figurā, quae puncta concentrātiōnis stressis creant, figura sphaerica haec uniformis vim aequē per matricem spātulae distribuit, ita ut resistentia ad impactum et dūrābilitās meliōrent. Experimenta in laborātōriō ostendunt formulātiōnēs, quae microsphaerās expansās ad spātulam continent, fortitūdinem compressīvam superantem 15 MPa servāre, dum rēductiō ponderis usque ad 40 pro centum consequitur. Hoc profīlum praestātiōnis eas praesertim valēbiles reddit in applicationibus aerōspatiālibus, quibus singulus gramus rēductiōnis ponderis in meliōrem efficāciam carburantis et in maiōrem capacitātem oneris vertitur. Praeterea proprietātēs elasticae microsphaerārum expansārum ad spātulam ad flexibilitātem meliōrem conferunt, ita ut materia indūrāta expansionem et contractionem thermicam accommodāre possit sine fissūris aut delaminātiōne, ac per hoc vītam operis prōlongāns et necessitātem manūtenentiōnis minuēns.