p-phenylene diisocyanate

Flammability

Link to relevant study record(s)

Reference

Endpoint:

flammable solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

05 Jul 2018 - 15 Oct 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

UN Manual of Tests and Criteria: Test N.1 (Test method for readily combustible solids)

Qualifier:

according to guideline

Guideline:

EU Method A.10 (Flammability (Solids))

GLP compliance:

yes

Specific details on test material used for the study:

Name p-phenylene diisocyanate
Batch no. 170329 (test item 1), 171206 (test item 2)
Appearance solid white flakes
Composition p-phenylene diisocyanate
CAS No. 104-49-4
EINECS-No. 203-207-6
Molecular formula C8H4N2O2
Molecular weight 160.13 g/mol
Purity > 99%
Homogeneity Homogeneous
Vapour pressure < 1 hPa at 20 °C
Stability in solvents: not stated
Solubility in solvents: not stated
Expiry date 28. Mar. 2018 (test item1), 02. Dec. 2018 (test item 2)
Storage Room Temperature: (20 ± 5 °C), keep away from humidity.

Key result

Test procedure:

burning rate test: preliminary screening test

Burning time:

3.75 min

Remarks on result:

other: The test item burned with an orange, soothing and sparkling flame. The combustion with flame of the test item propagated the 200 mm within 3 min and 44.91sec.

Key result

Test procedure:

burning rate test over 100 mm length

Remarks:

Exp 1

Burning time:

3.6 min

Remarks on result:

other: 3min 37 s

Key result

Test procedure:

burning rate test over 100 mm length

Remarks:

Exp 2

Burning time:

1.9 min

Remarks on result:

other: 1min 52s

Key result

Test procedure:

burning rate test over 100 mm length

Remarks:

Exp 3

Burning time:

2.75 min

Remarks on result:

other:

Remarks:

2min 45s

Key result

Test procedure:

burning rate test over 100 mm length

Remarks:

Exp 4

Burning time:

3.25 min

Remarks on result:

other: 3min 15s

Key result

Test procedure:

burning rate test over 100 mm length

Remarks:

Exp 5

Burning time:

2.5 min

Remarks on result:

other: 2min 33s

Key result

Test procedure:

burning rate test over 100 mm length

Burning time:

3.5 min

Remarks on result:

other: 3min 30s

First, a safety test was performed. A small amount of the test item was heated on a magnesia groove with a gas burner in order to derive safety precautions. The test item burned with soothing flame. A black light residue was observed.

Determination of burning rate.

Six experiments were performed. The data are given in the table below.

Performing	Time
1	3 min 37.34 sec.
2	1 min 52.56 sec.
3	2 min 45.28 sec
4	3 min 14.76 sec.
5	2 min 33.19 sec.
6	3 min 29.78 sec.

 

Interpretation of results:

not classified based on GHS criteria

Conclusions:

P-phenylene diisocyanate should be considered as not highly flammable (for EU regulations) and as non-flammable solid (for UN regulations)

Executive summary:

In the preliminary screening test following the EU and UN method, the test item was heated with the flame of a teclu burner.When ignited with the flame of a teclu burner, thetest item started to burn. After approximate 1 min the flame reached the marker. The test item burned with an orange, soothing and sparkling flame. The combustion with flame of the test item propagated the 200 mm within 3 min and 44.91sec.

Therefore, a burning rate for EU-regulations were performed. Six experiments were conducted.The burning rate showed the combustions propagated the 100 mm between 1 min 52.56 sec and 3 min 37.34 sec. The shortest burning time being more than 45 seconds. Therefore, the test itemp-phenylene diisocyanateshould be considered as not highly flammable (for EU regulations) and as non-flammable solid (for UN regulations).

Description of key information

p-phenylene diisocyanate (EC A.10): non-flammable

Key value for chemical safety assessment

Flammability:

not classified

Additional information

In the preliminary screening test following the EU and UN method, the test item was heated with the flame of a teclu burner.When ignited with the flame of a teclu burner, thetest item started to burn. After approximate 1 min the flame reached the marker. The test item burned with an orange, soothing and sparkling flame. The combustion with flame of the test item propagated the 200 mm within 3 min and 44.91sec.

Therefore, a burning rate for EU-regulations were performed. Six experiments were conducted.The burning rate showed the combustions propagated the 100 mm between 1 min 52.56 sec and 3 min 37.34 sec. The shortest burning time being more than 45 seconds. Therefore, the test itemp-phenylene diisocyanateshould be considered as not highly flammable (for EU regulations) and as non-flammable solid (for UN regulations).

Justification for classification or non-classification

Based on the key study result no classification is warranted for p-phenylene diisocyanate according to the criteria of CLP regulation 1272/2008.