What kind of straw
is harmful to human body health?
Reporters at random from the market to buy the 6 kinds of straw, to find out what material they are doing an experiment, which kinds of straws toxic, adverse to health.
Preliminary identification method is very simple, light straw with fire.
Large supermarket buy plastic straw in color, the dripping, burning flame is orange.
This should be a polyethylene or polypropylene, it can't be toxic PVC pipes.
For polyvinyl chloride (PVC) from flame it will go out.
Small commodity market to buy two straws in the combustion, the flame is large, but also from the relatively thick smoke.
This should is not pure polypropylene with additives, do not rule out is recycled plastic material.
Conclusion: fire left, can continue to burn, and there is something paraffin dripping, certainly not poisonous PVC.
Then through further distinguish the smell, the smell of the candle is polyethylene, the smell of oil is polypropylene.
Found by experiment, we randomly buy 6 kinds of straw, three kinds of PE, 3 kinds of polypropylene, found no toxic PVC pipe.
Bigger toxicity of PVC pipe, there is some on the market.
Remarkable characteristic is 'self-extinguishing' after burning, can burn, but left the fire goes out.
Can use this method to identify.
On the market at present there are three kinds of straw materials is roughly: polyethylene, polypropylene and PVC.
But according to the provisions of the state, can only be used for straw polypropylene.
In general, toxic straw is made of PVC material straw.
Polypropylene without damage, and can bear the high temperature of 100 ℃.
Polyethylene has no damage, but in the 60 -
70 ℃ water will become soft, because the price of polypropylene is cheap, some manufacturers use it as a straw.
Polyvinyl chloride (PVC), soften the start of the 80 ℃, 100 ℃ will break down.
And in production, you need to add a large amount of plasticizer, if use it to make a straw, harm to human body is very large.
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