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Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Appearance/physical state/colour:

In an experiment conducted SSS(Europe)AB,on the basis of visual perceptual,the chemical Tetrabutylammonium hydrogen sulphate was white colored Crystalline Powder in appearance.

Other supporting study from authoritative database also suggests that the the chemical Tetrabutylammonium hydrogen sulphate was white colored Crystalline Powder in appearance.

Melting point/freezing point:

The melting point determination of Tetrabutylammonium hydrogen sulphate (CAS No. 32503-27-8) was done following OECD Guideline 102 and according to the metal block capillary method. The test was conducted in replicates and mean melting temperature range was determined  to be 165.3 °C-167.5°C at 977.6hPa.

Boiling point:

The boiling point determination of Tetrabutylammonium hydrogen sulphate (CAS No. 32503-27-8) was done following OECD Guideline 103 and according to the method of Siwoloboff .the test item changes from colourless liquid to red before producing string of bubbles.The test was conducted in replicates and mean boiling point was determined  to be 213.3°C at 978.3 hPa.

Density:

The density of Tetrabutylammonium hydrogen sulphate (CAS No. 32503-27-8)was determined following OECD Guideline 109 and according to the Test methods: Pour density and tapped density of powder recommended in The International Pharmacopoeia, Fourth Edition, 2014 using bulk density apparatus. The mean pour density and tapped density of Tetrabutylammonium hydrogen sulphate  was determined  to be 0.4884 g/cm³ and 0.6254 g/cm³at 25.9 °C and 977.6 hPa.

Particle Size Distribution:

The particle size distribution of test item Tetrabutylammonium hydrogen sulphate (CAS No. 32503 -27-8 ) was determined by granulometric analysis with rotap sieve shaker.

The particle size distribution was determined to be in the range of 150 micron to 25 micron.

Vapour Pressure:

Modified Grain method from MPBPVP v1.43 was used to estimate the vapour pressure of Tetrabutylammonium hydrogen sulphate.

The estimated vapour pressure of Tetrabutylammonium hydrogen sulphate at 25 deg C was 6.8E-016 mm Hg = 9.06E-014 Pa.

Partition Coefficient:

KOWWIN v1.68 was used to estimate the octanol water partition coefficient of N,N,N-tributylbutan-1-aminium hydrogen sulfate

The estimated logPow value of N,N,N-tributylbutan-1-aminium hydrogen sulfate was 0.96.

Based on the values; N,N,N-tributylbutan-1-aminium hydrogen sulfate can be considered to be hydrophillic in nature which is also supported by its solubility in water.

Water Solubility:

The water solubility determination of test item Tetrabutylammonium hydrogen sulphate (CAS No. 32503-27-8) was done as per the OECD guideline 105 by spectrophotometric analytical method as per OECD 101.The water solubility was determined to be 31102.43 mg/L at 28°C.

WSKOW v1.42 was used to estimate the water solubility of Tetrabutylammonium hydrogen sulphate. The estimated water solubility of Tetrabutylammonium hydrogen sulphate at 25 deg C was 1081 mg/l.

The experimental and estimated values suggests that Tetrabutylammonium hydrogen sulphate is soluble in water.

Surface tension:

The study need only be conducted if surface activity is a desired property of the chemical. The N,N,N-tributylbutan-1-aminium hydrogen sulfate (CAS No. 32503-27-8) is used as a pharmaceutical compounds and metabolites. For this use, surface activity is not an important property. Hence this study was considered for waiver.

Flash point

The flash point determination of Tetrabutylammonium hydrogen sulphate (CAS No. 32503 -27 -8) was done as per the test guideline OECD 103. The method is closed cup method using Pensky Martin’s Flash Point Apparatus. The flashpoint of the test substance was determined to be 175.6°C at 977.4 hPa. based on criteria mentioned in CLP regulation the chemical has flash point >than 60 degree C hence Tetrabutylammonium hydrogen sulphate (CAS No 32503 -27 -8) was considered to be non-flammable.

Autoflammability:

N,N,N-tributylbutan-1-aminium hydrogen sulfate did not catch fire on being exposed to air at room temperature of 27°Cpressure of 966 hPa. This indicates that N,N,N-tributylbutan-1-aminium hydrogen sulfate is not auto-flammable.

Flammability:

N,N,N-tributylbutan-1-aminium hydrogen sulfate does not indicate any ignition when the flame of bunsen burner having temperature of approximately 950°C is brought in contact with it. Thus it can be concluded that N,N,N-tributylbutan-1-aminium hydrogen sulfate is not flammable at high temperature. However since such high temperatures are not found under normal circumstances of transportation and use, thus N,N,N-tributylbutan-1-aminium hydrogen sulfate was considered non-flammable for chemical safety assessment.

Explosiveness:

The study does not need to be conducted because there are no chemical groups present in the molecule which are associated with explosive properties.

Oxidising properties:

The study does not need to be conducted because there are no chemical groups present in the molecule which are associated with oxidising properties and hence, the classification procedure does not need to be applied.

pH

pH of 1% w/v aqueous solution of the test substance Tetrabutylammonium hydrogen sulphate (CAS No32503 -27 -8) is 1.73 at 26 °C. Thus, 1% solution can be considered to be acidic in nature.

Viscosity:

The study does not need to be conducted because the substance is a solid.

Additional information

Appearance/physical state/colour:

In an experiment conducted SSS(Europe)AB,on the basis of visual perceptual,the chemical Tetrabutylammonium hydrogen sulphate was white colored Crystalline Powder in appearance.

Other supporting study from authoritative database also suggests that the the chemical Tetrabutylammonium hydrogen sulphate was white colored Crystalline Powder in appearance.

Melting point/freezing point:

The melting point determination of Tetrabutylammonium hydrogen sulphate (CAS No. 32503-27-8) was done following OECD Guideline 102 and according to the metal block capillary method. The test was conducted in replicates and mean melting temperature range was determined  to be 165.3 °C-167.5°C at 977.6hPa.

Boiling point:

The boiling point determination of Tetrabutylammonium hydrogen sulphate (CAS No. 32503-27-8) was done following OECD Guideline 103 and according to the method of Siwoloboff .the test item changes from colourless liquid to red before producing string of bubbles.The test was conducted in replicates and mean boiling point was determined  to be 213.3°C at 978.3 hPa.

Density:

The density of Tetrabutylammonium hydrogen sulphate (CAS No. 32503-27-8)was determined following OECD Guideline 109 and according to the Test methods: Pour density and tapped density of powder recommended in The International Pharmacopoeia, Fourth Edition, 2014 using bulk density apparatus. The mean pour density and tapped density of Tetrabutylammonium hydrogen sulphate  was determined  to be 0.4884 g/cm³ and 0.6254 g/cm³at 25.9 °C and 977.6 hPa.

Particle Size Distribution:

The particle size distribution of test item Tetrabutylammonium hydrogen sulphate (CAS No. 32503-27-8 ) was determined by granulometric analysis with rotap sieve shaker.

The particle size distribution was determined to be in the range of 150 micron to 25 micron.

Vapour Pressure:

Modified Grain method from MPBPVP v1.43 was used to estimate the vapour pressure of Tetrabutylammonium hydrogen sulphate.

The estimated vapour pressure of Tetrabutylammonium hydrogen sulphate at 25 deg C was 6.8E-016 mm Hg = 9.06E-014 Pa.

Partition Coefficient:

KOWWIN v1.68 was used to estimate the octanol water partition coefficient of N,N,N-tributylbutan-1-aminium hydrogen sulfate

The estimated logPow value of N,N,N-tributylbutan-1-aminium hydrogen sulfate was 0.96.

Based on the values; N,N,N-tributylbutan-1-aminium hydrogen sulfate can be considered to be hydrophillic in nature which is also supported by its solubility in water.

Water Solubility:

The water solubility determination of test item Tetrabutylammonium hydrogen sulphate (CAS No. 32503-27-8) was done as per the OECD guideline 105 by spectrophotometric analytical method as per OECD 101.The water solubility was determined to be 31102.43 mg/L at 28°C.

WSKOW v1.42 was used to estimate the water solubility of Tetrabutylammonium hydrogen sulphate. The estimated water solubility of Tetrabutylammonium hydrogen sulphate at 25 deg C was 1081 mg/l.

The experimental and estimated values suggests that Tetrabutylammonium hydrogen sulphate is soluble in water.

Surface tension:

The study need only be conducted if surface activity is a desired property of the chemical. The N,N,N-tributylbutan-1-aminium hydrogen sulfate (CAS No. 32503-27-8) is used as a pharmaceutical compounds and metabolites. For this use, surface activity is not an important property. Hence this study was considered for waiver.

Flash point

The flash point determination of Tetrabutylammonium hydrogen sulphate (CAS No. 32503 -27 -8) was done as per the test guideline OECD 103. The method is closed cup method using Pensky Martin’s Flash Point Apparatus. The flashpoint of the test substance was determined to be 175.6°C at 977.4 hPa. based on criteria mentioned in CLP regulation the chemical has flash point >than 60 degree C hence Tetrabutylammonium hydrogen sulphate (CAS No 32503 -27 -8) was considered to be non-flammable.

Autoflammability:

N,N,N-tributylbutan-1-aminium hydrogen sulfate did not catch fire on being exposed to air at room temperature of 27°Cpressure of 966 hPa. This indicates that N,N,N-tributylbutan-1-aminium hydrogen sulfate is not auto-flammable.

Flammability:

N,N,N-tributylbutan-1-aminium hydrogen sulfate does not indicate any ignition when the flame of bunsen burner having temperature of approximately 950°C is brought in contact with it. Thus it can be concluded that N,N,N-tributylbutan-1-aminium hydrogen sulfate is not flammable at high temperature. However since such high temperatures are not found under normal circumstances of transportation and use, thus N,N,N-tributylbutan-1-aminium hydrogen sulfate was considered non-flammable for chemical safety assessment.

Explosiveness:

The study does not need to be conducted because there are no chemical groups present in the molecule which are associated with explosive properties.

Oxidising properties:

The study does not need to be conducted because there are no chemical groups present in the molecule which are associated with oxidising properties and hence, the classification procedure does not need to be applied.

pH

pH of 1% w/v aqueous solution of the test substance Tetrabutylammonium hydrogen sulphate (CAS No32503 -27 -8) is 1.73 at 26 °C. Thus, 1% solution can be considered to be acidic in nature.

Viscosity:

The study does not need to be conducted because the substance is a solid.