Dry chemical powder BC (IRAM standards 3566/1998)

NAME OBJECTIVE CRITERIA
02. Hygroscopicity Obtention of the hygroscopicity in the dry chemical powder. The obtained value for the hygroscopicity calculation must be a maximum of 3g/100g (3%).
05. Heat resistance Determine if an extreme heat affects the dry chemical powder. In the event of granules, these must be friable.
06.A Class A – 5B fire extinction Checking of the extinguishing power in liquid fuels in tray 5B. Extinction must be produced. The minimum time of effective discharge of the extinguisher must be of 8 sec.
09. Humidity Determination of humidity in the dry chemical powder. It must be a maximum of 0.25 g/100g
11. Electric isolation Determination of the electric isolation degree of the dry chemical powder subject to a high difference of electric power. The voltage value must be at least 5 kv.
12. Laboratory extinction Checking in laboratory of the extingushing capacity of the dry chemical powder. It must be higher or lower than the value declared by the manufacturer. If there is no data, it is considered approved if the extinguishing powder’s mass is a maximum of 1,5 gr.
10. Cold resistance Determine the formation of granules exposing the dry chemical powder to extreme cold. The time must be a maximum of 5 sec
01. Residue accumulated on screen Obtention of granulometry as residue accumulated on each screen. The residues values expressed in g/100gr must be declared by the manufacturer ±3 on screen 425 µm and 150 µm and ±6 on screen 75 µm and 45 µm.
08.B Chemical composition – Bicarbonate determination Determination of the bicarbonate percentage in a powder sample. For the constituents that make up less than 50% m/m, the contents of a component must be ±10 of the value declared by the manufacturer and 5% for the constituents higher than 50% m/m.
03. Agglutination Determination of the formation of granules in the dry chemical powder. After the fall, granules must broke and become powder.
04. Water repellency Determination of the dry chemical powder’s rejection and absortion as regards water. Higher than 90 gr/100 gr.
07. Compatibility with proteic foam Check the compatibility of the dry chemical powder with the proteic foam. Inclination with powder must be at most double from the one obtained during the blank test.
08.B Chemical composition – Sodium determination Determination of the sodium percentage in a powder sample. For the constituents that make up less than 50% m/m, the contents of a component must be ±10 of the value declared by the manufacturer and 5% for the constituents higher than 50% m/m.
08.C Chemical composition – Potassium determination Determination of the potassium percentage in a powder sample. For the constituents that make up less than 50% m/m, the contents of a component must be ±10 of the value declared by the manufacturer and 5% for the constituents higher than 50% m/m.
00. Fractioning and fitting out Divide the sample to perform trials and fit them