Household Aluminum foil
1 Look at the color: high-quality aluminum foil paper is like a mirror, the reverse is foggy but the silver is fresh. The surface of inferior aluminum foil is dim.
2 Look at the deterioration or not: Open the seal and pull out 30cm or more to check whether there is oxidative deterioration. After the metamorphic aluminum foil is oxidized, white-green alumina will be formed, because it is impossible to distinguish the deterioration by the light on the front ring surface.
3 look at the core: regular products will not do paper articles, but from the perspective of saving paper and transportation costs, the inner core tube diameter is generally between 3.5-4.5cm, the inner core wall thickness 1 Between -4mm, and the inferior product inner core tube is made thick and large, in order to replace the weight of the aluminum foil with the weight of the paper tube.
4 See if it is sufficient: The number of turns from the aluminum foil roll can basically distinguish whether it is sufficient. If the visual inspection is not sure, the weight of the inner core tube can be removed by using the electronic scale to distinguish it.
5 look at the certificate: regular manufacturers have the relevant department's testing certificate and product quality certification, and the general three no products can not be provided, the more effective way to check the authenticity of the certificate is online inquiry
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