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Appearance / physical state / colour

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Endpoint:
appearance / physical state / colour
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: GLP non compliant, guideline not known, information from published handbook, acceptable with restrictions
Principles of method if other than guideline:
The use of secondary sources of data is acceptable when they are based on a critical evaluation of peer-reviewed data and a consequent selection of a reliable and representative value for the property under investigation. The introduction to the Merck Index states that physical data are cited as found in the literature. When several alternate data values appear in the literature, the data is evaluated and representative selections are made; values are then reported with the corresponding source. Therefore, although the method used is not known, the values presented here are acceptable as they are from a reliable secondary source of phys chem. data.
GLP compliance:
not specified
Remarks:
No data reported
Physical state at 20°C and 1013 hPa:
gaseous
Form:
gas under pressure: liquefied gas
Colour:
Colourless
Odour:
other: mild aromatic
Substance type:
organic
Conclusions:
1,3-Butadiene is a colourless gas with a mild aromatic odour at standard temperature and pressure
Executive summary:

1,3 -Butadiene is a colourless gas, with a mild aromatic odour. No information on the method used is available. However, this information is taken from a reliable peer reviewed handbook and so can be considered reliable and suitable for use as the key study for this endpoint.

Endpoint:
appearance / physical state / colour
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: GLP not stated, guideline not stated, available as unpublished report, acceptable with restrictions
Principles of method if other than guideline:
State of the substance information was provided by individual companies in the form of a letter stating the relevant information. The letter was submitted in company’s headed paper and signed by the individual responsible for the area of work. Given that the companies have practical expertise in handling the substance/stream this was deemed to be acceptable information on the state of the substance.
GLP compliance:
not specified
Physical state at 20°C and 1013 hPa:
gaseous
Form:
liquified gas
Colour:
colourless
Odour:
other: olefin like
Substance type:
organic
Conclusions:
At 20°C and 1013 hPa the substance with CAS number 95465-89-7 is a colourless gas.
Executive summary:

At 20°C and 1013 hPa the substance with CAS number 95465 -89 -7 ( Hydrocarbons, C4, 1,3-butadiene- and isobutene-free) is a colourless gas. It is an organic substance. Data was received from the company confirming the physical state, form, colour, odour and substance type. This data is considered reliable and suitable for use.

Endpoint:
appearance / physical state / colour
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: available as an unpublished report, acceptable with restrictions
Principles of method if other than guideline:
State of the substance information was provided by individual companies in the form of a letter stating the relevant information. The letter was submitted in company’s headed paper and signed by the individual responsible for the area of work. Given that the companies have practical expertise in handling the substance/stream this was deemed to be acceptable information on the state of the substance.
GLP compliance:
not specified
Remarks:
no data provided
Physical state at 20°C and 1013 hPa:
gaseous
Form:
liquified gas
Colour:
Colourless
Odour:
odourless
Substance type:
petroleum product
Conclusions:
At 20°C and 1013 hPa the substance with CAS number 95465-91-1 is a colourless and odourless gas.
Executive summary:

At 20°C and 1013 hPa the substance with CAS number 95465-91-1 (Hydrocarbons, C4, butane conc., n-butene-contg.) is a colourless and odourless gas. It is a petroleum product. Data was received from the company confirming the physical state, form, colour, odour and substance type. This data is considered reliable and suitable for use.

Endpoint:
appearance / physical state / colour
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: available as an unpublished report, acceptable with restrictions
Principles of method if other than guideline:
State of the substance information was provided by individual companies in the form of a letter stating the relevant information. The letter was submitted in company’s headed paper and signed by the individual responsible for the area of work. Given that the companies have practical expertise in handling the substance/stream this was deemed to be acceptable information on the state of the substance.
GLP compliance:
not specified
Remarks:
no data provided
Physical state at 20°C and 1013 hPa:
gaseous
Form:
liquified gas
Colour:
Colourless
Odour:
odourless
Substance type:
petroleum product
Conclusions:
At 20°C and 1013 hPa the substance with CAS number 95465-90-0 is a colourless and odourless gas.
Executive summary:

At 20°C and 1013 hPa the substance with CAS number 95465-90-0 (Hydrocarbons, C4, N-Butene Conc.) is a colourless and odourless gas. It is a petroleum product. Data was received from the company confirming the physical state, form, colour, odour and substance type. This data is considered reliable and suitable for use.

Endpoint:
appearance / physical state / colour
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: available as an unpublished report, acceptable with restrictions
Principles of method if other than guideline:
State of the substance information was provided by individual companies in the form of a letter stating the relevant information. The letter was submitted in company’s headed paper and signed by the individual responsible for the area of work. Given that the companies have practical expertise in handling the substance/stream this was deemed to be acceptable information on the state of the substance.
GLP compliance:
not specified
Remarks:
no data provided
Physical state at 20°C and 1013 hPa:
gaseous
Form:
liquified gas
Colour:
Light amber
Odour:
sweetish
Substance type:
petroleum product
Conclusions:
At 20°C and 1013 hPa the substance with CAS number 91052-98-1 is a gas with a sweetish odour.
Executive summary:

At 20°C and 1013 hPa the substance with CAS number 91052-98-1 ( Hydrocarbons, C4, 1,3-Butadiene-Free) is a gas with a sweetish odour. It is a petroleum product. Data was received from the company confirming the physical state, form, colour, odour and substance type. This data is considered reliable and suitable for use.

Endpoint:
appearance / physical state / colour
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: available as an unpublished report, acceptable with restrictions
Justification for type of information:
Read-across discussed in Category Justification Document (CJD)
Principles of method if other than guideline:
State of the substance information was provided by individual companies in the form of a letter stating the relevant information. The letter was submitted in company’s headed paper and signed by the individual responsible for the area of work. Given that the companies have practical expertise in handling the substance/stream this was deemed to be acceptable information on the state of the substance.
GLP compliance:
not specified
Remarks:
no data provided
Physical state at 20°C and 1013 hPa:
gaseous
Form:
liquified gas
Colour:
Colourless
Odour:
odourless
Substance type:
organic
Conclusions:
At 20°C and 1013 hPa the substance with CAS number 91052-98-1 is a colourless and odourless gas.
Executive summary:

At 20°C and 1013 hPa the substance with CAS number 91052-98-1 is a colourless and odourless gas. It is an organic substance. Data was received from the company confirming the physical state, form, colour, odour and substance type. This data is considered reliable and suitable for use.

Endpoint:
appearance / physical state / colour
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: GLP non compliant, guideline not known, information from published handbook, acceptable with restrictions
Principles of method if other than guideline:
The use of secondary sources of data is acceptable when they are based on a critical evaluation of peer-reviewed data and a consequent selection of a reliable and representative value for the property under investigation. The introduction to the CRC Handbook of Chemistry and Physics states that data for physical constants have been taken from many sources, including both compilations and the primary literature. Where conflicts were found, the value deemed most reliable was chosen. Therefore, although the method used is not known, the values presented here are acceptable as they are from a reliable secondary source of phys chem. data.
GLP compliance:
not specified
Remarks:
No data reported
Physical state at 20°C and 1013 hPa:
gaseous
Form:
gas under pressure: liquefied gas
Colour:
Colourless
Substance type:
organic
Conclusions:
1,3-butadiene is a colourless gas at standard temperature and pressure
Executive summary:

1,3 -Butadiene is a colourless gas. No information on the method used is available. However, this information is taken from the CRC handbook which is a peer reviewed source and so can be considered reliable and suitable for use as the supporting study for this endpoint.

Description of key information

Appearance/physical state/ colour data was available for 1,3 -butadiene and 4 streams of C4 hydrocarbons. The streams within the category are all liquefied gaseous organic petroleum products. They are colourless to light amber in appearance and are odourless or have a sweetish smell.

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:
gaseous
Form:
gas under pressure: liquefied gas

Additional information

Data of the 4 streams of C4 hydrocarbons was obtained from 4 proprietary company studies carried out to standard test procedures so can be considered reliable and suitable for this endpoint.

No information is available on the method used for 1,3 -butadiene. However, information on 1,3 -butadiene is taken from a reliable peer reviewed handbook (O'Neil 2006) and so can be considered reliable and suitable for use as the key study for this endpoint. This result is supported by data from the CRC Handbook (Lide 2008) indicating that 1,3 -butadiene is a gas.