The development of fluorine-free foaming extinguishing agent. abbreviation FFEA. has become an urgent scientific challenge in the field of fire protection engineering due to the fact that the key component of existing aqueous film-forming foams is listed as a persistent organic pollutant. A study was conducted on foam performance and fire extinguishing efficiency of FFEA prepared by h... https://knifejoyers.shop/product-category/knife-accessory/