Tetrakis(hydroxymethyl)phosphonium sulphate(2:1)

Flammability

Link to relevant study record(s)

Reference

Endpoint:

flammable solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2010

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to other study

Qualifier:

according to guideline

Guideline:

EU Method A.10 (Flammability (Solids))

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

2009-04-07

Test procedure:

burning time (test type not further specified)

Remarks:

or specified in description of method (migrated information)

Remarks on result:

other: Neither ignition, nor propagation were observed.

Preliminary test

Experimental conditions

Humidity                                About 51%

Room temperature               About23 °C

Atmospheric pressure          98.4 kPa

Assay No. 1

The test item decomposed and made a colorless liquid which boiled. A red glow on a part of the test item (near the start of the flame) and a darkening were observed. Neither ignition, nor propagation were observed.

 

Assay No. 2

The same observations as for the assay No. 1 were recorded.

Taking into account the results obtained during the preliminary test, no main test was performed.

THPS was not considered as highly flammable under our experimental conditions.

Interpretation of results:

GHS criteria not met

Conclusions:

During the two assays of the preliminary test, the test item decomposed and made a colorless liquid which boiled. A red glow on a part of the test item (near the start of the flame) and a darkening were observed. Neither ignition, nor propagation were observed.
THPS was not considered as highly flammable under these experimental conditions.

Executive summary:

A reliable GLP study was performed to test the flammability of THPS dry active substance (100%), according to the EC A10 standard method.

In the preliminary test, the test item was formed into an unbroken strip or powder train, approximately 250-mm long, 20-mm wide and 10-mm high on a non-combustible, non-porous and low heat-conducting base plate. A hot flame from a gas burner was applied to one end of the powder train until ignition or for a maximum of 2 min. It was noted whether combustion propagates along 200 mm of the train within the 4-min test period.

During the two assays of the preliminary test, the test item decomposed and made a colorless liquid which boiled. A red glow on a part of the test item (near the start of the flame) and a darkening were observed. Neither ignition, nor propagation were observed.

THPS dry active substance is not considered as highly flammable for chemical risk assessment and CLP purposes.

Description of key information

A reliable key study was performed to test the flammability of THPS dry active substance (100%), according to the EC A10 standard method. During the two assays of the preliminary test, neither ignition, nor propagation were observed.

Thus the test substance was not considered as highly flammable. This result is supported by the expert statement of Harrison (1993).

Key value for chemical safety assessment

Flammability:

non flammable

Additional information

Two similar studies were performed to measure the flash point of THPS at 75% in aqueous solution as marketed (Tolcide PS75) using the Pensky-Martens apparatus according to a closed cup method. The test were not performed under GLP, but were inspected by internal Quality Assurance. The study of Talbot (1999) is well documented and meets generally accepted scientific principles and therefore was assessed as reliable key study (with restritions) for CLP and risk assessment purposes. The study of Fidoe is not well documented and its reliability cannot be assessed however, the result being consistent with the Talbot study it is used as supporting study.

In the key study, no flash occured up to 105°C at which point the pilot flame was extinguished by the steam from the hot sample. Shortly after this point, the sample boiled and poured out over the heating block and past the main heating flame. At no point was there any signs of ignition.

In the supporting study, THPS 75% was considered to have no flash point since the substance reached boiling point with no sign of ignition.

The tests demostrate that THPS 75% in aqueous solution (Tolcide PS75 as marketed) does not have a flash point up to 105°C and is not flammable.

Justification for classification or non-classification

A reliable key study was performed to test the flammability of THPS dry active substance (100%), according to the EC A10 standard method. During the two assays of the preliminary test, neither ignition, nor propagation were observed.

Thus the test substance, THPS dry at 100% was not considered as highly flammable for CLP purposes.

A reliable key study was performed to assess the flash point of THPS at 75% in aqueous solution as market (Tolcide PS75). No flash occured up to 105°C and shortly after this point, the sample boiled and poured out over the heating block and past the main heating flame. Thus the test substance, THPS 75% in aqueous solution as marketed (Tolcide PS75), is not considered flammable for CLP purposes.