The G-Ratio

A tool to simplify your compaction data

Using the G-ratio simplifies your compaction data and helps you to quickly evaluate and compare different materials/formulations. The G-ratio profile shows how the G-ratio of a material/formulation changes with compaction pressure. The shape of the profile allows you to easily categorise the compaction behaviour of powder into one of four types.

Two factors to consider:

  1. Is the G-ratio less than or greater than one? G-ratios >1 indicate good compaction behaviour while values <1 indicate poor compaction behaviour.
  2. Do the G-ratio values remain reasonably consistent with compaction pressure or are they dropping/increasing? Ideally, G-ratio values should remain level across the profile. Values that drop off with increasing compaction pressure are a concern as this implies there is a risk of over-compaction, tablets becoming weaker with higher compaction pressures. Materials that display increasing G-ratio values with compaction pressure are extremely rare, please contact us if you observe this interesting phenomenon!

Generated by the Gamlen Dashboard

The Gamlen Dashboard software, supplied with the R- and D-series Gamlen Compaction Analysers, automatically generate G-ratio profiles from compaction data. The user does not need to have previous experience of compaction analysis to understand this as the software aids data interpretation with clearly defined “good” and “bad” zones.