1,2-benzisothiazol-3(2H)-one 1,1-dioxide

Endpoint summary

Additional information

Appearence/physical state colour

On the basis of experimental observation 1,2-benzisothiazol-3(2H)-one 1,1-dioxide was found to be a White amorphous powdered organic solid.

Melting/Freezing point

The mean melting point range determination of 1,2-benzisothiazol-3(2H)-one 1,1-dioxide (CAS No. 81-07-2) was done following OECD Guideline 102 and according to the Capillary/metal block method. The test was conducted in replicates and mean melting point range was found to be 224.1 °C -226.6 °C at 980.6 hPa.

Boiling Point

The boiling point determination of Test item1,2-benzisothiazol-3(2H)-one 1,1-dioxide(CAS No. 81-07-2) was done as per the test guideline OECD 103. The method followed was according toSiwoloboff. The mean boiling point was found to greater than 250°C at 980.9 hPa.

Density:

The density of test item 1, 2-benzisothiazol-3(2H)-one 1,1-dioxide (CAS No. 81-07-2)was determined following OECD Guideline 109 and according to the method adapted from ASTM D 854-02 using glass pyknometer .The mean density of the test item was found to be 0.7932 g/cm3at 20°C and 981.3hPa

Particle size distrtibution

The particle size distribution of test item1,2-benzisothiazol-3(2H)-one 1,1-dioxide(CAS No. 81-07-2) (CAS No. 81-07-2 ) was determined by granulometric analysis with rotap sieve shaker.The cumulative percentages of test itemobtained for each sieve are as follows:

                                                                                                              

Sieve sizes(in microns)	Percentagedistribution (%) of test item
150 microns	25.33%
106 microns	52.35 %
75 microns	19.64%
53 microns	2.2%

Vapour Pressure

Vapour pressure of 1,2-benzisothiazol-3(2H)-one 1,1-dioxide was estimated to be 0.0000137 Pa by means of Modified Grain Method.

Partition coefficient

The partition coefficient of test substance CAS No. 81-07-2 was determined as per the shake flask method (OECD Guideline-107). The log Pow value was found to be -0.0237 @25 0C.

Water solubility

The water solubility determination of test item1,2-benzisothiazol-3(2H)-one 1,1-dioxide,(CAS No. 81-07-2) was done as per the shake flask method. The water solubility value was found to be 2900 mg/L at 24 deg.C.

 

Solubility in organic solvents / fat solubility

Gravimetric method was used to determine the solubility of the substance in organic solvent. The experimental value of solubility of 1,2-benzisothiazol-3(2H)-one 1,1-dioxide in methanol at 23 degC was found to be 3900 mg/L indicating that the substance is soluble in methanol.Using the Soxhlet/Solvent extraction method the solubility of the substance 1,2-benzisothiazol-3(2H)-one 1,1-dioxide in Petroleum ether is observed to be 1400 mg/L at 23 °C.The solubility value of 1,2-benzisothiazol-3(2H)-one 1,1-dioxide in methanol at 20 degC is equivalent to a value of 2521.73 mg/L.

 

Surface tension

In accordance with Column 2 adaptation statement of REACH Annex VII, information requirement 7.6, this end point was considered for waiver since surface activity was not a desired property of 1,2-benzisothiazol-3(2H)-one 1,1-dioxide.

 

Flash point

The flash point determination of 1,2-benzisothiazol-3(2H)-one 1,1-dioxide (CAS No. 81-07-2) was done following closed cup method using Pensky-Martens flash point apparatus. The test was conducted in replicates and mean flash point was found to be 161.3°C °C at 979.1 hPa.

Auto flammability

1,2-benzisothiazol-3(2H)-one 1,1-dioxide did not catch fire on being exposed to air at room temperature of 23 degC and atmospheric pressure of 955 hPa.This indicates that 1,2-benzisothiazol-3(2H)-one 1,1-dioxide is not auto-flammable.

Flammability

From the experimental value of flammability, 1,2-benzisothiazol-3(2H)-one 1,1-dioxide ignited when the flame of Bunsen burner having temperature of 950 degC was brought in contact with it. Thus it can be concluded that 1,2-benzisothiazol-3(2H)-one 1,1-dioxide is flammable only at high temperature of about 950 degC. However since such high temperatures are not found under normal circumstances of transportation and use, 1,2-benzisothiazol-3(2H)-one 1,1-dioxide was considered non-flammable for chemical safety assessment.

 

Explosiveness

According to theoretical considerations based on chemical structure, 1,2-benzisothiazol-3(2H)-one 1,1-dioxide does not possess explosive properties. The reason for this is there are no chemical groups associated with explosive properties in 1,2-benzisothiazol-3(2H)-one 1,1-dioxide. Thus, as per column 2 of Annex VII this end point was considered for waiver.

Oxidising properties

1,2-benzisothiazol-3(2H)-one 1,1-dioxide was found to have mild oxidising property since 142.3 ml of KMnO4 was required for getting the end point of the redox titration for 100 ml of 1,2-benzisothiazol-3(2H)-one 1,1-dioxide.Thus, the chemical is considered as non-oxidising for the purpose of chemical safety report and classification.

 

Stability in organic solvents and identity of relevant degradation products

1,2-benzisothiazol-3(2H)-one 1,1-dioxide was found to be stable in organic solvent di-chloro methane and no degradation products were formed after 24 hours as evident from the GC-MS chromatogram obtained at 0 hours and that obtained after 24 hours.

 

pH

The pH determination of test item1,2-benzisothiazol-3(2H)-one 1,1-dioxide(CAS No. .81-07-2) was done as per the test guideline OECD 122. The pH of the test dispersion was determined with the help of digitalpH meter. The pH was found to be1.84 at 31 °C.

 

Dissociation constant

The experimental pKa value for 1,2-benzisothiazol-3(2H)-one 1,1-dioxide was found to be 0.004 at 23 °C indicating that it has dissociating properties.

Viscosity

This end point was considered for waiver since viscosity is an inherent property of a liquid that offers resistance to its flow and 1,2-benzisothiazol-3(2H)-one 1,1-dioxide is a solid substance and hence this testing was considered scientifically unjustified for 1,2-benzisothiazol-3(2H)-one 1,1-dioxide.