3a,4,7,7a-tetrahydro-4,7-methanoindene

Appearance / physical state / colour

Link to relevant study record(s)

Reference

Endpoint:

appearance / physical state / colour

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2005

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: GLP not known information from published handbook data limitations in design and/or reporting but otherwise adequate for assessment

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 NIOSH Pocket Guide to Chemical Hazards is intended as a source of general industrial hygiene information for workers, employers, and occupational health professionals. The Pocket Guide presents key information and data from the US Department of Health and Human Services and as such is a reliable governmental source of information.

GLP compliance:

not specified

Remarks:

No data reported

Specific details on test material used for the study:

N/A

Physical state at 20°C and 1013 hPa:

solid

Remarks:

Note: liquid above 90° F (32.2°C)

Key result

Form:

crystalline

Colour:

colourless crystalline solid

Odour:

other: Camphor-like odour

Substance type:

organic

N/A

Conclusions:

DCPD is a colourless crystalline solid at ambient temperature and pressure. DCPD becomes a liquid above 90° F (32.2°C).

Executive summary:

No information on the primary source of this data or the methods used is available. However, this information is taken from a reliable government source and is therefore considered to be suitable for use as a key study.

Description of key information

High purity DCPD is a colourless crystalline solid at ambient temperature and pressure.

Commercial DCPD is a liquid at ambient temperature and pressure.

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:

liquid

Form:

other: High purity DCPD is a colourless crystalline solid at ambient temperature and pressure. Commercial DCPD is a liquid at ambient temperature and pressure.

Additional information

The Pocket Guide presents key information and data from the US Department of Health and Human Services and as such is a reliable governmental source of information and is considered a suitable key study source for this endpoint (NIOSH 2005). This is supported by data from ECETOC (1991) which also indicates that DCPD is a solid.

The state of commercial DCPD was taken from proprietary data. There is no information on the GLP status of the study or the methods used but the results are taken from company specific pro-forma and are considered to be suitable for use for this endpoint.

DCPD resin grade and UPR grade are both liquid at room temperature and have a vapour pressure of approximately 4.8 kPa. High purity DCPD is a waxy solid at room temperature with negligible dust generation and with a vapour pressure of 0.2-0.3 kPa. Based on the vapour pressure of the different DCPD grades it is likely that the higher exposure of the workers would be due to the liquid form of the substance. Therefore, an exposure assessment based on the liquid form should be protective of the worker using the solid form. This applies to inhalation and dermal exposures at the workplace.