IPI tests paper-based materials and adhesives for pH levels using a modification (described in ISO 18902) of the standardized test, TAPPI T 509 Hydrogen Ion Concentration (pH) of Paper Extracts (Cold Extraction Method). This determines if a material is acidic, basic, or neutral. The acidity of a material is described by its pH value. The pH scale ranges from 0 to 14, where 7 is neutral, below 7 is acidic, and above 7 is alkaline. Acidic environments can accelerate the degradation of paper and plastic supports making them brittle. Highly alkaline environments, on the other hand, can also cause decay, such as weakening of a gelatin binder. Since an upper pH limit is just as important as a lower pH limit, the standard incorporates an upper pH limit of 10. To be considered photo-safe, paper-based materials and adhesives must have a pH equal to or greater than the reference water used in testing and less than 10 when measured by a cold extraction pH method.
For the pH test, the customer shall provide IPI with 10 grams of each material submitted for testing. Please name or code your samples so that we have a reference by which to communicate the test results. Our test reports will refer only to your specific label.
The pH test is a destructive test; sample materials cannot be returned.
| Cold Extraction pH Test per ISO 18902 | |
|---|---|
| First two samples inclusive (minimum charge) | $600 |
| Each additional samples (sent at same time) | $300 |
| Cold Extraction pH Test and Alkali Reserve Package | |
|---|---|
| First two samples inclusive (minimum charge) | $900 |
| Each additional samples (sent at same time) | $450 |