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Physical & Chemical properties

Storage stability and reactivity towards container material

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Administrative data

storage stability and reactivity towards container material
Type of information:
experimental study
Adequacy of study:
key study
Study period:
February - July 1995
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: The study was not conducted according to guidelines but was conducted according to GLPs and the report contains sufficient data for interpretation of study results.

Data source

Reference Type:
study report
Report date:

Materials and methods

Test guideline
no guideline followed
Principles of method if other than guideline:
Two samples of the same lot number of Kordek 573T Industrial Microbiocide were submitted for analysis at zero time, one month and three month time points.
GLP compliance:
Type of method:
ambient testing

Test material

Constituent 1
Test material form:
other: solid
Details on test material:
All Series 63 characterizations of Kordek 573T Industrial Microbicide were done using the Technical Grade Active Ingredient (TGAI). The test material consisted of >95% 2-methyl-4-isothiazol-3-one. Impurities ranged from 0.1 to 1.0% and total less than 5.0%.
Specific details on test material used for the study:
All samples were prepared in a glove box that was purged with nitrogen (relative humidity was <10%). Each sample was melted, and aliquots were transferred into dry, preweighed vials. The sample weight was determined by difference.

The working standard used is RH-573, Lot AAP12269C, 48.7% in Propylene Glycol. The control sample used was Batch 1935 from Technical Grade Lot # 1022 = 51.8%. The samples were prepared in duplicate and each prep was injected in duplicate. The control sample was prepped in duplicate and the preps were analyzed twice, distributed throughout the sequence.

Results and discussion

The test material was stable over a 3 month time period. There was no change in color and physical state of the test material over the three months. In addition, there was no change in the storage container over the three month period.
Transformation products:

Any other information on results incl. tables

Table 1 Grand Averages for % 573 Samples (Sample #1029)

 Age  % RH-573
 Zero Time  96.8
 One Month  97.1
 Three Month  98.4

Applicant's summary and conclusion

Kordek 573T Industrial Microbiocide was stable for at least 3 months.
Executive summary:

The stability of Kordek 573T Industrial Microbicide was determined over a three month period. Kordek 573T Industrial Microbiocide was stable for at least 3 months.