Reaction mass of Silicic acid, calcium salt and Silicic acid, magnesium salt

Vapour pressure

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

vapour pressure

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the melting point is above 300°C

Justification for type of information:

Expert judgement based on observation, knowledge of the manufacturing method, and analytical data e.g. on the composition of CMS.

Reason / purpose for cross-reference:

data waiving: supporting information

Reason / purpose for cross-reference:

data waiving: supporting information

Conclusions:

In complience with the REACH regulation, data on vapour pressure was waived for both silicon dioxide (CAS 7631-86-9) and calcium silicate (CAS1344-95-2) as the melting point was > 300 °C (OECD SIDS, 2004). Measurements of melting point was performed on synthetic amorphous silicon dioxide, whereas for calcium silicate, a read-across from synthetic amorphous silicon dioxide was made. Taken together, measurment of vapour pressure for CMS powder does not need to be conducted as the melting point, as for synthetic amorphous silicon dioxide, is estimated to be above 300 °C.

Executive summary:

In complience with the REACH regulation, measurement of vapour pressure for synthetic amorphous silicon dioxide (CAS 7631-86-9) does not need to be conducted as the melting point is above 300 °C (approximately 1700

°C). Due to sharing similar structural, physical and chemical properties to CMS, synthetic amorphous silica is considered appropriate for read-across purposes. A melting point above 1000 Celcius is also reported in the SDS of CMS powder. Taken together, measurments of vapour pressure for CMS powder do not need to be conducted as the melting point, as for synthetic amorphous silicon dioxide, is estiamted to be above 300 °C.

Reference 2

Endpoint:

vapour pressure

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the melting point is above 300°C

Reason / purpose for cross-reference:

data waiving: supporting information

Specific details on test material used for the study:

In complience with the REACH regulation, data on vapour pressure was waived for both silicon dioxide (CAS 7631-86-9) and calcium silicate (CAS1344-95-2), melting point > 300 °C (OECD SIDS, 2004).

Conclusions:

In complience with the REACH regulation, data on vapour pressure was waived for both silicon dioxide (CAS 7631-86-9) and calcium silicate (CAS1344-95-2), melting point > 300 °C (OECD SIDS, 2004).

Executive summary:

In accordance with the REACH regulation, data on vapour pressure was waived for both silicon dioxide (CAS 7631-86-9) and calcium silicate (CAS1344-95-2),  melting point > 300 °C (OECD SIDS, 2004). Melting point was measured for silicon dioxide whereas for calcium silicate, an analogue read-approach from silicon dioxide was carried out.  

Reference 3

Endpoint:

vapour pressure

Type of information:

other: Quartzene CMS - paste

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Principles of method if other than guideline:

Vapour pressure not measured: not applicable.

Type of method:

other: See "Remarks"

Remarks:

Not applicable

Key result

Remarks on result:

not measured/tested

Remarks:

Not applicable.

Conclusions:

Vapour pressure: not applicable for CMS paste.

Description of key information

In compliance with the REACH regulation, measurement of vapour pressure for synthetic amorphous silicon dioxide (CAS 7631-86-9) does not need to be conducted as the melting point is above 300 °C (approximately 1700

°C). Due to sharing similar structural, physical and chemical properties to synthetic amorphous silica,

measurments of vapour pressure for CMS do not need to be conducted as the melting point, as for synthetic amorphous silicon dioxide, is assumed to be above 300 °C. The above statement is an expert judgement based on observation, knowledge of the manufacturing method, and analytical data e.g. on the composition of CMS.

A melting point above 1000 Celcius is also reported in the SDS of CMS powder. Measurements of vapour pressure for the paste form of CMS is not applicable.

Additional information

Not applicable for inert and inorganic substance.