Food plastic bags are often used in people's lives, but the use of the time must be careful, some plastic bags, but toxic, can not be used to directly loaded food.
with the eye observation method
Non-toxic plastic bags were white, transparent or slightly transparent, uniform texture; toxic plastic bags were color or white, but the transparency is poor, more turbid, plastic surface tension is uneven, with small particles.
Listen to the sound
Hand shake the plastic bag, issued a crisp sound that is non-toxic plastic bags; and the sound is small and boring is toxic plastic bags.
Touch by hand
Hand touch the surface of plastic bags, very smooth is non-toxic; sticky, astringent, waxy sense of the toxic.
Smell with the nose
Non-toxic plastic bags are tasteless; irritating smell or taste is not normal is toxic
Water test
Put the plastic bag into the water, hand to the bottom of the water, wait a moment, the surface is the non-toxic plastic bags, sink in the water that is toxic plastic bags.
Combustion
Non-toxic plastic bags flammable, flame tip was yellow, local was blue, burning like a candle like tears dripping, a paraffin flavor; toxic plastic bags are not easy to burn, from the fire that is extinguished, the flame tip was yellow, the bottom was green , Softening can be drawing
