Trimethoxyoctylsilane

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1996-12-04 to 1997-02-20

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Remarks:

The study was conducted in accordance to an appropriate OECD test guideline with acceptable restriction. The restrictions were: unexplained early bubbling observed during the study and a lack of boiling in one replicate sample.

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling point/boiling range)

Deviations:

not specified

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Deviations:

not specified

GLP compliance:

yes

Type of method:

photocell detection

Key result

Boiling pt.:

227 °C

Atm. press.:

101.3 kPa

Decomposition:

ambiguous

Remarks:

States irregular bubbling observed long before actual boiling temperature. However, the boiling point is measured when the frequency of bubbling is constant one per second. But, one of three runs showed no boiling at all.

Key result

Boiling pt.:

500 K

Atm. press.:

1 013 hPa

Decomposition:

ambiguous

Remarks:

States irregular bubbling observed long before actual boiling temperature. However, the boiling point is measured when the frequency of bubbling is constant one per second. But, one of three runs showed no boiling at all.

 The results of the measurements are summarised in the table below

Test no.	Atmospheric pressure [kPa]	Boiling temperature [^oC / K]	Boiling point [^oC / K]
1	98.5	225.5 / 498.7	226.7 / 499.9
2	98.5	No boiling detected	No boiling detected
3	98.5	225.7 / 498.9	227.0 / 500.2
		Mean value	227 / 500

 

The mean boiling point of the test substance (at 101.3 kPa) was 500 K = 227^oC

Conclusions:

A boiling point value of 227°C at 1013 hPa was determined for the substance in a reliable study conducted according to an appropriate test protocol. Restrictions of the study were: unexplained early bubbling observed during the study and a lack of boiling in one replicate sample.

Description of key information

Boiling point: 227°C at 1013 hPa (OECD 103)

Key value for chemical safety assessment

Boiling point at 101 325 Pa:

227 °C

Additional information

A measured boiling point of 227°C at 1013 hPa was determined for the substance using a photocell detection method in accordance with OECD Test Guideline 103 and in compliance with GLP. Before the main study was conducted, the boiling point of the substance was obtained from extrapolation of the raw data from the vapour pressure study; a boiling point of 222°C at 1013 hPa was calculated for the substance based on the vapour pressure. Although, during the study, an unexplained early bubbling and lack of boiling in one of the replicate sample was observed, the result is considered to be reliable and is selected as key study.

The measured boiling point was supported by a predicted boiling point of 220°C at 1013 hPa which was obtained for the substance using a validated QSAR estimation method.

In available secondary sources to which reliability could not be assigned, boiling point values of 246°C at 1013 hPa and 192°C were reported for the substance. For the lower boiling point, no atmospheric pressure was reported.