Molecular Formula: KNa 
Molecular Formula: 62.09g/mol
Product Categories: Alkali MetalsMaterials Science;Alloys;Metal and Ceramic Science;Reduction;Synthetic Reagents;AlloysEssential Chemicals;Adsorbents, Filter Aids and Drying Agents;Other Drying Agents 

Hazard Codes: F,C
Risk Statements: 11-14/15-34-15 
R11:Highly flammable. 
R14 :Reacts violently with water. 
R15:Contact with water liberates extremely flammable gases. 
R34:Causes burns.
Safety Statements: 16-26-27-36/37/39-45-43 
S16:Keep away from sources of ignition. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S27:Take off immediately all contaminated clothing. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S43:In case of fire use ... (there follows the type of fire-fighting equipment to be used.)
RIDADR: UN 1422 4.3/PG 1
WGK Germany: 1
HazardClass: 4.3
PackingGroup: I
A low-melting alloy of Na and K. Its toxicity is due to either Na or K alone. Corrosive to the eyes, skin, and mucous membranes. Upon contact with moisture it reacts violently to evolve H₂; much heat; and a highly caustic residue of NaOH or KOH. Oxidation forms Na₂O and K₂O, which are powerful caustics.

A dangerous fire and explosion hazard. Violent or explosive reaction with O₂, water, moisture, steam, halogens, oxidizers, acids or acid fumes, giving off much heat, hydrogen, toxic and corrosive fumes, often spattering either red-hot particles or actually flaming particles. A severe explosion hazard, will react explosively under the appropriate conditions with moisture, acids, acid fumes, solid CO₂, carbon disulfide, halocarbons (e.g., CH₃Cl, carbon tetrachloride, chloroform, bromoform, 1,1,1-trichloroethane, 1,1,2-trichlorotrifluoroethane, tetrachloroethane, CH₂Cl₂, CH₂I₂), ammonium sulfate + NH₄ + NO₃, HgO, metal halides (e.g., silver halides, zinc chloride, iron(III) chloride), metal oxides (e.g., silver oxide, mercury oxide), nitrogen-containing explosives (e.g., ammonium nitrate, ammonium sulfate, picric acid, nitrobenzene), oxalyl bromide, oxalyl chloride, pentachloroethane, K oxides, KO₂, Si, NaHCO₃, polytetrafluoroethylene. Reacts vigorously with oxidizing materials.

To fight fire, use G-1 powder, dry sodium chloride, dry sodium carbonate, dry calcium carbonate, dry sand, resin-coated sodium chloride, or dry soda ash. Never use water, graphite, carbon dioxide, halocarbons, or foam.

Dangerous; when heated it emits highly toxic fumes of Na₂O and K₂O. Used as a liquid coolant for nuclear reactor cores. See also SODIUM and POTASSIUM.

DOT Classification:  4.3; Label: Dangerous When Wet

  Potassium sodium alloy , its cas register number is 64058-30-6. It also can be called Potassiumsodiumalloy78:22(99.95%) ;
 potassiumsodiumalloys ; Sodiumpotassiumalloy,nak ; Potassiumsodiumalloy78:22 . Potassium sodium alloy (CAS NO.11135-81-2) is highly flammable and it will Reacts violently with water. You should keep it away from sources of ignition and wear suitable protective clothing, gloves and eye/face protection. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.