Spinflam MF 83 PP-25

Endpoint summary

Additional information

APPEARANCE/PHYSICAL STATE/COLOUR

Spinflam MF 83 PP-25 (DG HF 2000) is a white powder at 20 °C and 1013 hPa.

MELTING and BOILING POINT

The melting point was measured using the capillary method and the report indicates that the substance melts at the temperature of 287-288 °C. Nevertheless, another test is available to determine the ignition temperature. The procedures consist on placing the sample in contact with an heated plate, increasing the temperature up to 400 °C. The first reaction was recorded at 280 °C and, starting from this point up to the highest temperature tested. This test clearly indicates that the substance does not melt, but rather decomposes at high temperature; other outcomes deriving from the ATEX Directive context experiments (reported at the IUCLID endpoint sections 4.11, 4.12 and 4.13) suggest that the test substance undergoes decomposition. The reaction recorded at about 280 °C in both the capillary and the ignition temperature in layer test, may be just due to the evaporation of the water content or may be the starting temperature of decomposition of the substance to be registered. This findings are also more consistent with the chemistry of the substance which is mainly composed by ionic species in a polyphosphate structure.

WATER SOLUBILITY

Spinflam MF 83 PP-25 is an UVCB substance, which consists in piperazine acidic phosphate and 1,3,5-trazine-2,4,6-triamine orthophosphoric acid. In the RBM "Antoine Marxer" test (1999) this composition was ascertained both by weighing the water-soluble and water-insoluble residues and analytically monitoring the water-soluble part. The components are characterized by opposite properties when placed in water: the piperazine phosphate, monitored by reaction with phenyl isothiocyanate (PITC), showed quite high water solubility (about 10000 mg/l) when analyzed alone; on the contrary, the other component not detectable under the analytical conditions adopted was practically insoluble and its water solubility being estimated to < 9 mg/l.

This is confirmed by a Redox study which also measured some components of the dissolved fraction.

In conclusion, the test substance can be considered partially soluble in water.

SOLUBILITY IN ORGANIC SOLVENTS

No organic solvent is known to be capable to dissolve the whole substance: this substance is not soluble. DMSO could dissolve a minor percentage of melamine (7.46 % w/w), that was measured by HPLC.

PARTITION COEFFICIENT

In the oldest test available (RBM "Antoine Marxer", 2000) performed using the Shake flak method, the test item was not detectable in the n-octanol phases in any test condition, thus it was not possible to calculate its partition coefficient.

In the other test available (Redox, 2010) the 1-octanol soluble fraction was calculated by difference with the initial weight of sample and the log ratio between the soluble fraction and the insoluble fraction was recorded at -0.58. Nevertheless this is not a real Kow as this substance is only partially soluble in either water or any other organic solvent. The value is overestimated as it includes in the octanol phase everything which is soluble in no solvent.

DISSOCIATION CONSTANT

The precise UVCB structure is unknown, nevertheless the fractions composing the substance can be identify in the piperazine, phosphate and melamine.

Despite the curve resulted by titration performed with HCl 0.1 N and NaOH 0.1 does not report any inflection point, the dissociation potential of the substance to be registered resulted evident in the ecotoxicological tests, in which was reported that Spinflam MF 83 PP-25 cause a slight decrease of test solution's pH (generally the pH measured was in the range of 5.8 - 6.6).

AUTO FLAMMABILITY/FLAMMABILITY/EXPLOSIVENESS/OXIDISING PROPERTIES

The available experimental test results were performed in the ATEX Directive context (94/9/EC directive), to assess the Dust Explosion Characteristics. The goals and the experimental procedures are different compared to the test purpose of the REACH context, nevertheless they provide some information about the substance behaviour.

Lower Limit of Flammability, The minimum ignition temperature (MIT cloud), Ignition temperature in layer, The minimum ignition energy (MIE) and Specific powder resistivity tests were conducted in different ways, but all were performed maintaining the sample in mixture with air or oxidising agents.

In reactions which involve combustion, it has to be considered that the oxygen is the oxidizing agent par excellence in the air, thus a flammable/explosive reaction of a powder in mixture with air would be favoured, respect a reaction in a closed system, with a source of oxygen limited. Despite in some experiments a source of ignition was provided, the powder sample had never shown signs of ignition.

Therefore, the substance does not meet the criteria to be not classified as auto flammable/flammable/explosive/oxidising.