lambda4-cerium(4+) zirconium(4+) tetraoxidandiide

Flash point

Administrative data

Endpoint:

flash point of flammable liquids

Data waiving:

study technically not feasible

Justification for data waiving:

the study does not need to be conducted because the substance is inorganic

the study does not need to be conducted because the flash point is only relevant to liquids and low melting point solids

Cross-reference

Reason / purpose for cross-reference:

data waiving: supporting information

Reference

A GLP-compliant study, scored as Klimisch 1 and assigned as a key study, is available on the reaction mass of cerium dioxide and zirconium dioxide, yielding a melting point value superior to 500°C (Demangel, 2010a). The study was performed with a representative nanoform, but the melting point of any potential bulk form, should such form be placed on the market, can reasonably be considered to be > 500°C as well.

In an experimental study, scored as Klimisch 1 (Weissenfeld, 2006), a melting point of > 400°C was observed for cerium dioxide. Literature information, scored as Klimisch 2 (Lide, CRC Handbook, 1991) or 4 (NIEHS, 2006; IRIS-EPA, 2009), is also available on cerium dioxide, reporting consistently high melting point values (ranging between 2400 and 2600°C). Literature information on zirconium dioxide, scored as Klimisch 2 (Lide, CRC Handbook, 2001; O'Neil, Merck Index, 2006) also reports consistently high melting point values (approximately 2700 °C). Data on these constituents are used as supporting studies in a read across analogue approach.