From this page you can always download the latest version of HSPiP. And you can also get copies of key datasets, papers, theses, Powerpoint presentations that explore individual issues in depth.


For first-time purchasers and for users who want an upgrade, the program is downloaded as a standard Microsoft msi installer. The download can be done at any time and there are no tiresome registration screens - the download link is direct.

Download the HSPiP Package Installer as HSPiPInstall.msi. Once downloaded, double click on the .msi file and it will install the program files into the relevant Microsoft Program Files folder and the many useful data files are installed in My Documents\HSPiP Data. By purchasing HSPiP you get a license file, which you place in the program files folder, typically c:\program files\Hansen-Solubility\HSPiP so that the program can automatically detect it.

The current version is v5.0.04. We offer free updates to all users - just download from here and install over the previous version (no need to uninstall first). Users are notified of all major updates but need to check here from time to time to see if there is a newer minor version. By clicking on HSPiP Version Information.doc they can check whether the latest features are worth the hassle of a download/install. Although the package includes a Help file, some users like to download it as a standalone file, HSPiP Help.rtf. There is also a separate Help document for the QSAR capabilities, HSPiP QHelp.rtf

5th Edition for modern 64x machines with 32x Windows

Some users have modern 64x machines but their corporations have 32x versions of (say) Win7. A 32x version of the 5th Edition is offered "as is". It has not been fully tested and users might encounter screen resolution problems if they have older monitors as well. As this, by default, installs into c:\program files(x86)\Hansen-Solubility\HSPiP it will overwrite the previous version. Those who want to keep the older version should first copy the whole folder to another location.

v4.1.07 for older 32x machines

Those who need to re-install HSPiP on older machines or who have purchased HSPiP but do not have a modern 64x processor should download the 32x HSPiP Package Installer as HSPiPInstall417-32x.msi. As it installs into program files(x86) rather than the 64x program files folder, those who wish to have both versions on the same machine are welcome to do so.

A handy HSP Excel Spreadsheet

This has a list of HSP values for solvents and allows you to calculate HSP Spheres, optimize solvent blends, calculate Chi values etc. Download HSP_Calculations.xlsx.

The chemicals included in HSPiP

To check out the chemicals included in the "Hansen" and "10K" datasets within HSPiP, download HSPiPDataSet.xls which contains just the chemical name and CAS # and distinguishes between the two datasets.

A Different Interpretation of the Hedenqvist and Gedde (Polymer 1999) Study for n-Hexane Diffusion in Natural Rubber and Low Density Polyethylene

Response to a question on the effects of surface swelling stress on diffusion, July 1, 2013
The diffusion equation with a significant surface condition and exponential diffusion coefficients can satisfactorily model the experiments. A comparison of different approaches to model S-shaped absorption curves is given. Forget step-like, advancing fronts. The diffusion equation itself can apparently handle what is often called “time-dependent” phenomena. Download Hedenqvist and Gedde.pdf.

Understanding Absorption in Polymers: Key to Improving Barrier Properties

Presentation and Supplementary Text from talk at the 50th Nordic Polymer Days in Helsinki, May 29-31, 2013.
Download the presentation, Understanding Absorption In Polymers.pptx and the Supplementary Text.

In Defense of the Diffusion Equation (Why Mismatched Hansen Solubility Parameters Improve the Barrier Properties of Polymer Films)

February 22, 2013
A manuscript has been prepared to show that the diffusion equation can model all types of “anomalous” absorption (Sigmoidal/two-stage), Case II, and Super Case II) as well as desorption (film formation), and all stages of permeation. Since the diffusion equation itself has not been recognized earlier as being able to account for all of these, the manuscript has the title “In Defense of the Diffusion Equation”. Concentration dependent diffusion coefficients and/or a significant surface boundary condition are often required, especially when the “anomalies” are modeled. It is also confirmed that the HSP of a barrier polymer and solute should be as different as possible. This minimizes concentration gradients, reduces diffusion coefficients, and keeps the surface entry mass transfer coefficient low. An alternative title could well have been “Why Mismatched Hansen Solubility Parameters Improve the Barrier Properties of Polymer Films”.Download In Defense of the Diffusion Equation.pdf.

Surface Effects versus Bulk Phenomena as Explanations of “Anomalous” Absorption in Polymers

February 22, 2013
Problems with explanations for diffusion in polymers based exclusively on bulk phenomena are contrasted with successful modeling provided by the diffusion equation itself. None of the theories exclusively based on bulk phenomena are satisfactory. The diffusion equation must be solved for a significant surface condition as well as for concentration dependent diffusion coefficients for Case II and Super Case II. With increasing solute concentration the diffusion resistance becomes less and less important as absorption proceeds. The surface condition dominates at the final stages. There are at least three reasons for what is called sigmoidal absorption, depending on which kind of resistance is dominant at the start, and how this may change as the experiment proceeds. Download Surface versus Bulk.pdf.

Response to the Criticism of Petropoulos and Coworkers

Feb 22, 2013
Petropoulos and Coworkers have criticized my diffusion coefficient approach for explaining “anomalous” diffusion and stated that this could not model given experiments. I attempted to respond earlier as part of a full manuscript without success. The key portions of my response regarding the key experiments are included here in the document “Response to the Criticism of Petropoulos and Coworkers”, and in part in other documents being put onto the website at the same time that are more comprehensive. It has later been determined that the diffusion coefficient for the absorbing solvent that can be calculated from the data given by Petropoulos and Coworkers is several times larger than the self-diffusion coefficient for the solvent for absorption in the stretched direction in the critical experiment. Without this leakage there would not be a step-like advancing concentration gradient. Download Response to the Criticism of Petropoulos and Coworkers.pdf.

Reinterpreting Case II Absorption in PMMA

An analysis of the Thomas and Windle data for the absorption of methanol into PMMA can be downloaded as a PDF document. This report confirms that the diffusion equation can model Case II absorption without consideration of relaxation phenomena. Step-like concentration gradients advancing at a linear rate with time have been thought to be an inherent part of Case II type absorption in polymers. These are not found in this analysis of the data for the characteristic examples of Thomas and Windle. The diffusion equation solved with an exponential concentration dependent diffusion coefficient and a significant surface condition is shown to reproduce the experimental data for weight gain at the same time demonstrating the lack of step-like concentration gradients. The surface condition appears to be particularly important in the methanol/PMMA systems studied by Thomas and Windle. Methanol “fronts” meet at the center of a free film much more quickly than the iodine tracer “fronts" that give the impression of a step-like concentration gradient. The free film is saturated with methanol at the same time as the iodine tracer gets to its center only at or near 30°C. The iodine tracer molecules diffuse much more slowly than the methanol molecules as expected from literature data, making iodine unsuitable as a tracer for this system. Download Reinterpreting Case II Absorption in Polymers.pdf.

Reexamination of Super Case II – Data of Jacques, Hopfenberg, and Others

This is an analysis of experimental data with added theoretical examples. It is shown that Super Case II absorption can be successfully modeled by the diffusion equation with exponential diffusion coefficients and a significant surface condition. There is no need to consider relaxation or related phenomena as such. Download Reexamination of Super Case II.pdf.

Reinterpreting the Experiments of Carlà et al. for the Absorption of Supercritical Carbon Dioxide into PMMA

This is an analysis of experimental data for the absorption of supercritical carbon dioxide into 1 micron thick PMMA films applied to quartz microbalances. It is shown that a significant surface condition completely controls the absorption with flat concentration gradients in the film from the very start. Download Interpreting Absorption of Supercritical Carbon dioxide in PMMA.pdf.

Hansen doctoral thesis from 1967

This document is of historical interest but also contains much that remains fresh and relevant to HSP today. It is now in OCRd PDF format so it fully searchable. Download Hansen Doctoral Thesis.

HSP powerpoint presentation (Hansen)

A general overview of HSP from Charles Hansen and text to accompany this presentation. Download HSP Oct 2009.ppt and the accompanying text

Diffusion powerpoint presentation (Hansen)

An overview of Diffusion science and text to accompany the presentation. Download Diffusion July 2012.ppt and the accompanying text

A view of HSP from Agfa Labs

A presentation given at the AIMCAL Europe coatings symposium in Prague July 2012 by Dr Frank Ruttens of Agfa Lab, provided here with kind permission of Agfa Labs. Download F_Ruttens_HSP_Aimcal_2012_Prague.pdf

The official site of Hansen Solubility Parameters and HSPiP software.