February 25, China Market Regulatory News reporter interviewed Wang Baojun, director of the National Textile Products Quality Inspection Center. The conclusion is that "this test method is not reliable!"
Wang told reporters, with the virus protection effect of disposable medical masks, generally, three layers, the core raw materials for the production of polypropylene melt-spray non-woven intermediate layer, this layer is also a disposable mask is a key layer of virus protection effect.
The real virus protection effect of disposable medical masks, take out the middle layer, burn with a lighter, it can not burn, with professional terminology is molten spray non-woven ignition should be the molten effect, generally does not produce a flame.
Disposable masks with flames in the middle layer of the ignition must be fake√
Director Wang further said: "If a lighter ignites the disposable mask after the middle layer of flame, the layer is certainly not made of polypropylene melt-spray non-woven fabric, the test mask is certainly not up to the virus protection effect, but also certainly not a disposable medical mask."
Then, is it possible to conclude that the lighter ignites the middle layer of the disposable mask, without flame, producing a molten effect, that is, to prove that the raw material of the layer is molten spray non-woven fabric, and thus prove that the mask tested is a disposable medical mask with viral protection function?
NO! NO! NO!
Wang's director very clearly told reporters that the middle layer of the disposable medical masks taken out of the test, lit, must be fake; can not be lit, but also may not be the real thing. That is to say, the point is not to produce a molten effect, can not prove that the middle layer is molten spray non-woven material, it can not prove that the mask is a disposable medical mask with a virus protection effect.
Disposable medical masks do not burn in the middle layer√
The lack of burning in the middle layer must prove that it's a disposable medical mask.
The reporter learned that the raw material for melt-blown nonwoven fabric is mainly polypropylene.
However, the combustion effect is almost identical to that of melt-blown nonwovens, and there are also nonwovens made from synthetic fibers such as polypropylene, nylon, and polyester fibers.
In other words, when ignited with a lighter, there is no flame to produce a molten effect, and such material may be polypropylene melt-blown nonwoven fabric or other fiber nonwoven fabric.
The main factor that determines the absolute difference in viral protection between melt-blown nonwovens and other fiber nonwovens is the difference in the manufacturing process.
How is it simple and feasible for the average consumer to determine whether the disposable mask purchased is a disposable medical mask with virus protection effects?
Director Wang described several approaches.
First, the disposable mask is tested by hand from the outside (contact airside) to the inside (contact face side) into a pocket shape, filled with an appropriate amount of water, about 1-2 minutes, if there is no leakage, while the inner layer does not have any water seepage, it means that the tested mask is very good waterproof, the mask for droplets, bodily fluids and other ways of invasion has a very good protective effect. The melt nonwoven fabric is very dense due to its manufacturing process, and the fiber gaps are so small that they are able to achieve this effect. Other fiber nonwovens do not achieve this effect.
Second, dismantle the disposable mask being tested, take out the middle layer, through a magnifying glass, if you can see one by one fiber, then the layer is certainly not melt-sprayed non-woven products, the mask is also certainly not disposable medical masks.
Third, wear the test disposable mask, exhale while covering the outer layer of the mask with your hand, if you can feel the airflow is very strong, breathing is smooth, then the filtering effect of the mask should be relatively poor, the virus protection effect is naturally very poor, and certainly not a disposable medical mask.
The reporter made a summary - to determine whether the purchase of disposable masks are disposable medical masks, there are four simple test methods.
(a) First, the middle layer of the mask is lit and there is a flame, proving that the mask has poor viral protection and is certainly not a disposable medical mask.
(b) Secondly, the mask does not leak after being filled with water from the outside to the inside, which provides good protection against viruses, while water seepage is certainly not a disposable medical mask.
Thirdly, when the middle layer of the mask is looked at with a magnifying glass, no silk can be seen, and the virus protection is good; it is obvious that the silk is definitely not a disposable medical mask.
Fourth, put on the mask and exhale, hands over the face, do not feel the heat, there is some resistance to breathing, good protection.
Do you understand? Important thing again, a lighter igniting the middle layer of a disposable mask, with flames, is certainly not a disposable medical mask; without flames, it may not be the real thing.
