![6804](https://img.petfoodindustry.com/files/base/wattglobalmedia/all/image/2015/02/pfi.6804.png?auto=format%2Ccompress&q=70&w=400)
Plastic Technologies Inc. has a free iPhone/iPad app to calculate the final intrinsic viscosity for polyethylene terephthalate resin, called the PET Hydrolytic Degradation Nomograph. The nomograph uses a graphic representation of numerical values to produce a final calculation, and it enables the user to indicate the starting IV by sliding a plot point on a vertical scale to the appropriate value. The same is done for moisture percentage.