Dikaliumoxid Chemische Eigenschaften,Einsatz,Produktion Methoden
ERSCHEINUNGSBILD
GRAUES HYGROSKOPISCHES KRISTALLINES PULVER
CHEMISCHE GEFAHREN
Starke Base in w?ssriger L?sung. Reagiert sehr heftig mit S?uren. ?tzend. Reagiert heftig mit Wasser unter Bildung von Kaliumhydroxid. Greift viele Metalle in Gegenwart von Wasser an.
ARBEITSPLATZGRENZWERTE
TLV nicht festgelegt.
MAK nicht festgelegt.
AUFNAHMEWEGE
Schwerwiegende lokale Wirkungen auf allen Aufnahmewegen.
INHALATIONSGEFAHREN
Eine gesundheitssch?dliche Partikelkonzentration in der Luft kann schnell erreicht werden.
WIRKUNGEN BEI KURZZEITEXPOSITION
WIRKUNGEN BEI KURZZEITEXPOSITION: Die Substanz ver?tzt die Augen, die Haut und die Atemwege. ?tzend beim Verschlucken. Inhalation des Aerosols kann zu Lungen?dem führen (siehe ANMERKUNGEN). ?rztliche Beobachtung notwendig.
LECKAGE
Pers?nliche Schutzausrüstung: Chemikalienschutzanzug mit umgebungsluftunabh?ngigem Atemschutzger?t. Verschüttetes Material in trockenen abgedeckten Kunststoff-Beh?ltern sammeln. Reste mit viel Wasser wegspülen.
Chemische Eigenschaften
gray crystal(s) mass; hygroscopic [CRC10] [HAW93]
Verwenden
Potassium oxide is a strong alkaline flux which is similar to sodium oxide but is slightly less strong and it begins its fluxing action earlier than does sodium oxide, at approximately 1382°F (750°C). It's a predictable, stable flux that produces bright glossy glazes, but it can't be used alone as a flux. Potassium produces slightly stronger glaze surfaces than does sodium oxide. Its low viscosity and surface tension create fluid glaze melts, but its high coefficient of expansion and contraction may cause crazing.
As mentioned above, potassium oxide is often found combined with sodium oxide, so it's often written as KNaO. lt's only slightly volatile at ceramic temperatures and is just slightly soluble.Usually used in its insoluble forms as feldspars or slightly soluble frits, potassium oxide can also be introduced to the glaze recipe as soluble pearl ash (potassium carbonate), which can cause some flashing like sodium carbonate.
Insoluble sources of potassium oxide are potash feldspars such as Custer, G-200, K-200, A-3, Kona F-4(Del Monte), Cornwall stone, Plastic Vitrox, volcanic ash, Kona A-1, Bell, Eureka, A-300, and mica. All soda feldspars have some potassium oxide; frits P-25, 3110, and 3124 contain minor amounts. Soluble forms of potassium oxide include pearl ash(K2CO3), potassium nitrate (saltpeter), and unwashed wood ash.
Definition
ChEBI: A metal oxide with formula K2O.
Allgemeine Beschreibung
A white-colored crystalline solid. Denser than water. Contact may severely irritate skin, eyes and mucous membranes. May be toxic by ingestion, inhalation and skin absorption. Used to make other chemicals.
Air & Water Reaktionen
Soluble in water. The oxides of potassium react with water vigorously and with enough evolution of heat to cause boiling and spattering of hot caustic solution, [Chemical Safety Data Sheets SD-9, SD-10. 1947]. Reacts with warm water with violent explosion [Thorpe and Tlitton J. Chem. Soc. 59:1019: 1891].
Reaktivit?t anzeigen
The higher oxides of potassium, formed in air, react explosively with pure potassium, sodium, sodium-potassium alloys, and organic matter [Mellor 2, Supp. 3:1559. 1963].
Health Hazard
TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.
Brandgefahr
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.
Dikaliumoxid Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
