w3pbs
Mechanical
- Mar 17, 2023
- 5
I have very little understanding of chemistry, and I am quoting this from a materials declaration expert:
[pre]oxides of metals are combined and different metals give different properties
after combining the powders and firing at a high temperature and transform the
individual oxides of metals into glass or ceramic matrix as a glass frit.
The individual CAS Numbers that were present when they were a powder do not
exist as single substances anymore. The term UVCB now applies. (unknown or
variable composition of biological materials)[/pre]
What can be done to relate this to the purposes of REACH and other scrubbing lists?
More precisely, what are the chances that the UVCB now contains restricted substances, in ppm that exceeds the regulatory tolerances?
For example:
Will "combining" and "firing" any combination of "oxides of metals", none of which is Mercury, results in UVCB that all of the sudden contains Mercury?
By knowing what's NOT in the source mixtures is it becoming predicable what is not going to be in the resulting UVCB?
[pre]oxides of metals are combined and different metals give different properties
after combining the powders and firing at a high temperature and transform the
individual oxides of metals into glass or ceramic matrix as a glass frit.
The individual CAS Numbers that were present when they were a powder do not
exist as single substances anymore. The term UVCB now applies. (unknown or
variable composition of biological materials)[/pre]
What can be done to relate this to the purposes of REACH and other scrubbing lists?
More precisely, what are the chances that the UVCB now contains restricted substances, in ppm that exceeds the regulatory tolerances?
For example:
Will "combining" and "firing" any combination of "oxides of metals", none of which is Mercury, results in UVCB that all of the sudden contains Mercury?
By knowing what's NOT in the source mixtures is it becoming predicable what is not going to be in the resulting UVCB?