1. Material: There are two kinds of composite materials on the market nowadays, one is PET + PE, the other is PA + PE. So what's the difference between the two materials? From the cost point of view, PA is higher than PET, the technical indicators are different, and the quality is better. Apparently, products made of PA materials are softer than those made of PET.
2. Look at the thickness, this is the reason for the big price difference. Generally speaking, there are three main types in the market: 0.06 MM, 0.08 MM and 0.10 MM. For households, the most suitable one is 0.08 MM.
3. Look at the appearance: We must see if there are obvious defects in the appearance of the product, mainly hard wrinkles, damages, dirty marks and so on. If these are not good, the production conditions are poor. So the quality will not be too good!
Fourth, the most critical point, and also the basic purpose of our purchase of this product, is to maintain a vacuum. If there is a leak, then the product is useless!

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