we're looking for standards and tests for SAP properties :)
A SAP is a polymer that can absorb many times its own weight in aqueous fluids. One test of the swelling capacity is the use of gravimetry. There is lots of literature to find about this.
For information on the industry standard test methods for superabsorbents refer to the EDANA (European Disposables and Nonwovens Association) web site at http://www.edana.org/index.cfm
A recent recommendation of RILEM states tests to determine the (ab)sorption properties of SAPs.
Article Recommendation of RILEM TC 260-RSC: testing sorption by supe...
You may also find a helpful literature "A review of characterisation methods for superabsorbent polymer (SAP) samples to be used in cement-based construction materials- report of the RILEM TC 260-RSC" by Dr. Schrofl, Snoeck and Mechtcherine.
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