Lunch box ni hta shelf life nga ai. Hkaulan mam box ni a shelf life hpe madung hku nna shi a arung arai, lang ai aten, san seng ai ladat hte shingbyi shara zawn re ai lam ni a majaw hkra machyi shangun ai. N bung ai arung arai ni a shana shat gawk ni a shelf life mung n bung ai:
Plastic shana shat sha na sumpu: Ga law malawng gaw 3-5 ning tup nga ai shelf life nga ai. Polypropylene (PP) hte galaw da ai lusha seng ni gaw, nbung katsi ai hpe grai hkam sharang lu nna, 5 ning du hkra hkam sharang lu ai; shing rai yang, polycarbonate (PC) hte galaw da ai shana shat gawk ni gaw asak kaba wa na matu loi ai rai nna, 3 ning laman hta galai na matu hpaji jaw da ai. Law law lang lang ai hte n tara ai hku jasan jaseng ai gaw, plastic shana shat sha ai shara ni a daw jau ai prat hpe kadun shangun na re.
Stainless steel shat shadu ai sumpu: N-gun ja ai n-gun n-gun hpe ninghkap lu ai, law malawng gaw 10 ning jan na hkra n-gun rawng ai. Raitim, dai hpe sadi ra ai gaw, galu kaba ai- aten galu tawn da ai lam (sh) tsaw dik htum-}acid malu masha ni gaw shi a magam bungli prat hpe kadun shangun lu ai.
Glass shat shadu ai sumpu: Chemical stability grai kaja ai, madung hku nna gaw asan sha n-gun n rawng ai, raitim, shi a arung arai ni a asak kaba wa ai lam (silicone sealing ring zawn re ai) hpe ayan jep yu ra ai.
