neutral PH mouth muffle Eu EN149 standard face mask

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neutral PH mouth muffle Eu EN149 standard face mask

  • Description

    : Food Grade SDF Series _Precipitated silicaDalian Dalian Fuchang Chemical Co., Ltd is a professional silicon dioxide manufacturer. mainly products including fumed silica, precipitated silica, silica matting agent.
  • Type

    : Disposable / Reusable
  • Function

    : Coronavirus, Anti-pollution, PM2.5, cold, dust, pollen, allergy
  • Package

    : 10pcs/20pcs/50pcs per pack
  • Certification

    : CE, FDA, ISO
  • Min Order

    : 1000 Pieces
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neutral PH mouth muffle Eu EN149 standard face mask Description

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    The operational key for this scheme was in Harvard, where "one of the researchers was the chairman of Harvard's Public Health Nutrition Department and an ad hoc member of SRF's board." (Source) Their review was published in a 1967 issue of the New England Journal of Medicine.