stability ranges

I set a range for viscosity and put my samples in stability.  I noticed the viscosity has gone out of range after 30 days.  Should you automatically change the range or just wait for the full 90 days?  This is before anything has gone to production yet.  



  • PerryPerry Administrator, Professional Chemist
    Setting the initial range is simply a guess. I’d wait to change anything until you know where the viscosity goes
  • Thank you @Perry
    Now after that how does that work for production?  you have the initial stability done with lab batches.  When the formulation goes to production with the same specs from the stability. .wouldn't specs need to change to reflect the actual production batch(es).
  • PerryPerry Administrator, Professional Chemist
    Ideally, the spec range would be the same. But if production is different you can either make adjustments to your production batches to get them in spec, or you could change the spec to reflect what happens in production. Another option is to have an initial release spec & then a final release spec over time. 
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