What are the material technology of pe waterproof bag

The real waterproof bag is qualitatively waterproof according to the material technology and waterproof conditions. 　　1: General waterproof: General waterproof: The general waterproofing is to sewn the waterproof fabric with the needle and thread process, and then use the waterproof tape to fit the needle thread hole to prevent water from entering. 2: Professional waterproofing: There are two types of professional waterproofing: 　　A: In terms of technology and materials, the waterproof level is the highest requirement. This kind of waterproof bag is mostly used for outdoor drifting, and the material is 500D-1000D mesh or TPU composite Mainly, the process uses high-frequency voltage to melt the two pieces of material seamlessly, and then is reinforced with a transparent material with a transparent and smooth bag mouth of about 15CM. The outer three-fold and the inner three-fold can be truly waterproof. (It can be used as a lifebuoy after inflation).　　B: Submersible waterproof: There is a waterproof bag for phones or cameras on the market, which can be waterproof below 10 meters, and the waterproof clip can reach a depth of 10-20 meters underwater.　　 2 refers to the waterproof lining used on the top of ski gloves, generally made of waterproof and breathable materials such as TPU or hipora.　　 Label: pe waterproof bag