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Michigan P.E. makes a good catch RE: sg

News | April 1, 2013 | By:

To the editor:

Great issue (February/March 2013), read it from cover to cover.

One thing I noticed though, on page 40 it states: “..were made of polypropylene, which has a specific gravity greater than 1,…” is incorrect. Typically polypropylene has a sg of 0.905 and that is why it floats, not sinks, as alluded to in the article. 

Have a good one and, again, great issue!

Russ Sutton, P.E.
Civil Engineer–Water, Wastewater & Utilities
U.S. Forest Service–Region 9 Technical Services Team
Cadillac, Mich.


Correct sentence from February/March Geosynthetics:

Because the geotextiles that were used in this project were made of polypropylene, which has a specific gravity less than 1, UESI had to find a solution that would allow erosion control protection under the waterline while ensuring that the products would stay in position during the service life of the project.

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Click here to read the online article about reinforced levees referenced in the letter. Send your comments to editor Ron Bygness at

Comments and letters can contain opinions of individuals who are writing and do not necessarily reflect the views of Geosynthetics magazine or the Industrial Fabrics Association International.

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