Как быстро проверить герметичность чашки термоса
Inverted water leakage test Fill the cup with hot water (not to the top, leaving a small amount of air), затянуть крышку, invert and let it stand for 2 к 5 минуты, and shake it a few times. If there is no water leakage or dripping, it is considered qualified; if water droplets leak, […]
