First, look at the material commonly used vacuum compression bag materials are generally selected: PA + PE, PET + PE, MOPE, PVC, etc., the best material should now be nylon + polyethylene (PA + PE), PA + PE vacuum The compression bag is made of a new plastic compounded with nylon and plastic. This material is a prerequisite for ensuring no air leakage. It is relatively flexible and durable. It does not change the traits when it is cold, but because of the high cost, domestic manufacturers rarely use this material. PA+PE can burn slowly when it is burned. The flame is bright, the bottom is blue, the upper end is yellow, and the molten droplets continue to burn.

The smokeless melt drops the smell of candle blowing and burning wool. The other is PET+PE. PET is commonly known as polyester polyester. The vacuum compression bag made of PET+PE is not soft enough, especially hard and crack at low temperature. It is better for friends in the north to use vacuum compression bags of this material. So how do you identify these two different materials? To be honest, the experience is not rich friends like the identification of counterfeit banknotes, the high-fidelity counterfeit banknotes are difficult to distinguish between true and false, but the contrast with the real banknotes is revealed. Therefore, to identify two different materials, it is best to compare the two together. The method is: one touch, the softer feel is PA material, the harder one is PET material.

Second, listen to it by hand, the sound is more blunt is PA material, the sound is sharp and harsh is PET material.

The third is to put the two materials in the freezer of the refrigerator for a while, and the harder one is PET. Nowadays, many brands of compression bags on the Internet are selling very cheaply, and they are also said to be PA+PE. This consumer can be wary of  MOPE's advantages are particularly soft, feel better than others, but the adhesion is not good, generally leaking more. Now it is gradually being eliminated by the market. I believe that many people have experienced it. It is easy to pump the air and it will be swelled again in one night.

Needless to say, PVC is not environmentally friendly at all. PVC is difficult to burn, it is extinguished when it leaves the fire. It burns yellow-orange, green on the edge, emits white smoke, and sprays light green and yellow flame, softens, can be drawn, and has a stimulating hydrogen chloride smell. Second, look at the thickness of the vacuum compression bag thickness is represented by "wire", the general vacuum compression bag thickness from 6-8 silk "wire" number, the thicker the bag. Generally, it is better to use 6-8 filaments in the vacuum compression bag, because such a bag is moderate in thickness, and the bag is too hard and too brittle because it is too thick. Nor will it be scrapped if it is too thin for a year or two. Generally, the bag of 6-8 silk PA+PE is no problem for about 5 years.  which are both soft and durable. It is the only vacuum compression bag on the market that can be so thin and durable. Some manufacturers What thickening version of 11 silk or even 15 silk is used because some manufacturers use recycled plastics for reprocessing. Because they are afraid of poor quality, they are deliberately thickened. Such bags will leak frequently, and they will not be used several times. It will be scrapped, just like the Kumho tires. There is also a look at the details of a good vacuum compression bag will inevitably be done in the pumping valve and sealing or even the zipper slide. Good quality always runs through.