1.Appearance requirements
(1) The surface should be uniform in gloss, without obvious flashes and obvious mold clamping lines, with slight shrinkage and depression allowed, slight scratches and slight scratches, and uneven edges; no cracks, scars, and obvious bonding line.
(2) There should be no obvious injection molding defects such as warping deformation, dents, silver streaks, flow marks, under-injection, and injection port.
(3) No obvious color difference is allowed.
(4) Black dots with penetrating impurities and more than 0.5mm dispersion are not allowed.
(5) Except for the bottom and mouth, air bubbles are not allowed in other parts.
2. Drop performance should not break.
3. Acid and alkali resistance (detergent), the box body and the lid should not have obvious discoloration or damage.
4. Pollution resistance, the box body and the lid should be free from obvious pollution.
5. Temperature resistance, no obvious leakage or deformation of the box body and the lid.
6. Hermeticity should not leak.
7. The vacuum degree of the vacuum preservation box should not be greater than -4kPa.