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Can PE plastic bags hold food? pe plastic bags can be used to store food, but it is best not to use plastic bags to store food, especially not to use plastic bags to store hot food with high oil content, such as malatang, hot fried dough sticks, etc. ​wholesale plastic bag  ，  , pay special attention not to eat it to young children . mouth. The commonly used plastic bags on the market have the following materials: high pressure polyethylene, low pressure polyethylene, polypropylene, polyvinyl chloride and recycled materials. There are also many colorful market convenience bags made from recycled materials. Although plastic bags made of recycled materials look shiny, they cannot be used to package food because they are made from recycled materials made from waste plastic. like： ​Is it toxic to use pe plastic bags? is it safe? ​Are pe plastic bags food grade? ​Which PP and PE plastic bags for food are safe

How to divide the IP waterproof level of headphones? The IP waterproof level can be divided into 8 levels.  ​Waterproof Wired Earphones ， Let's see how these 8 levels are distinguished? IPX1: stands for vertical dripping, dripping in the vertical direction has no effect, the water flow is 1mm/min, and the test is 10min. IPX2: 15 degrees of water dripping, when the vertical surfaces of the housing are inclined within 15 degrees, the vertical dripping water should have no harmful effect, the water flow is 3mm/min, and each inclined position is 2.5min. IPX3: Each vertical surface is exposed to rain within a range of 60 degrees, without harmful effects, the water flow is 10L/min, and the test time is 10min. IPX4: splashing water, splashing water in all directions of the casing has no effect, each vertical surface is exposed to rain within a range of 180 degrees, the water flow is 10L/min, and the test time is 10min. IPX5: water spray, no effect on the shell in all directions, the water

In nature, in addition to the light visible to the human eye, there are also invisible light such as ultraviolet and infrared.  ​thermal camera manufacturer  ，    Any object with a temperature higher than absolute zero in nature will radiate electromagnetic waves (infrared rays) at any time, so infrared rays are the most widely spread electromagnetic waves in nature, and thermal infrared rays will not be absorbed by atmospheric smoke clouds. With the rapid development of science and technology, the characteristics of infrared rays are used to combine applied electronic technology with computer software and infrared technology to detect and measure thermal radiation. The heat radiated from the surface of the object, the thermal sensor obtains different thermal differences, and through the processing of electronic technology and software technology, images with different brightness or color difference are presented, which is what we usually call infrared thermal imaging. like： ​The diffe