Trial design and interpretation
Retain neat and formulated samples from the same candidate lot. Measure initial and final available oxygen under identical storage conditions. Divide the final value by the initial value for retention and state whether results are expressed on total formulation weight.
Recording Available oxygen
Available oxygen (Mass fraction): Solvay Oxyper SCM-ST third-party example ≥13%. The cited grade uses permanganate titration. Agree a method for the grade being purchased. Particle size distribution: use the agreed method. Measure fines after blending and compare with the initial particle-size distribution.
Why does initial active oxygen match but retention in detergent powder differ?
Compare coating grade, blending sequence and storage in the same base powder and packaging. Retain an unblended control. Detergent powder storage: Compare available oxygen retention for ordinary and coated granules in the same formulation under the agreed shelf conditions.
What to record
- Formula and coating status
- Initial available oxygen
- Storage conditions
- Final available oxygen
Technical references
Products and processes
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