Referring to the domestic and foreign standards of normal dry powder fire extinguishing agent, the concept of "least agent dosage" is employed to estimate anti-fire efficiency.
用NH_4H_2PO_4含量为95％的干粉灭火剂为主料，经超细化和表面防团聚改性处理，制得了不同粒度的超细微粒灭火剂试样；参照普通干粉灭火剂国内外的标准，提出了用最小灭火剂用量来表征灭火效能。