Title: Chemical Resistance

Chemical Resistance

Geomembranes are made from some of the most chemically resistant materials available. This Tech Note describes the chemical properties of Layfield materials.

One of the most important properties of geomembranes is chemical resistance. The materials chosen for geomembranes include some of the most chemically resistant products available, however, each material has its strengths and weaknesses. This Tech Note describes some of the chemical properties of the geomembrane materials available from Layfield.

Who Chooses the Geomembrane?

There are currently millions of chemicals in use in our world and we have test data for only a few hundred geomembrane/chemical combinations. From these tests we try and infer whether the geomembrane will be suitable for the containment of that particular chemical. It is the responsibility of the owner of the chemical to determine that the containment will be suitable for the application intended. In all cases where clear chemical data from the manufacturer does not exist Layfield recommends that the owner of the chemical perform a test to satisfy themselves as to the suitability of the proposed geomembrane.

The owner and the engineer choose the geomembrane based on their professional experience. Layfield has not been paid any fee to prepare this chemical Tech Note and offers the information solely as a point of discussion. Our opinions are intended to direct the user to geomembrane materials that are likely to be suitable for the containment of a chemical and we expect the user to perform their own tests to confirm that opinion. The choice of the geomembrane in all cases must be by the owner of the chemical, or by the engineer representing the owner.

How to Read the Chem Chart

The chemical resistance chart on the following pages has been compiled by Layfield from a number of sources. A designation of A, B, or C indicates that an actual test was performed and the result is listed. The designations of T, and X indicate that a test was not performed, however, it is likely that the result will be as listed. Each chemical was tested with the geomembrane listed at room temperature at the concentration given. If no concentration is listed then the geomembrane was tested in a saturated solution or a full concentration. If a different concentration shows in an individual listing then that is the maximum concentration that achieved an “A” rating for that geomembrane.

How the Chem Ratings Work

An “A” rating means that a test was performed where the geomembrane appeared to be suitable for primary containment. A “B” rating means that a test was performed that showed some attack of the geomembrane but that the geomembrane may be suitable for secondary containment. A “C” rating indicates that the geomembrane was adversely affected by the test.

A “T” rating means that a knowledgeable person has expressed the opinion that the geomembrane material may be suitable for primary or secondary containment. An “X” rating means that a knowledgeable person has expressed the opinion that the geomembrane material may be adversely affected by contact with this chemical. Missing data indicates that no test or opinion was available.

Your Obligation to Test

The purpose of this Tech Note is to identify geomembranes that, if tested, should satisfy your containment requirements. A rating of A or T means that there is an excellent chance that a chemical resistance test with that geomembrane/chemical combination will be successful. A listing of C or X means that a test of that chemical/geomembrane combination would not be worth testing. A rating of a B should always be tested at the project conditions.

It is the owner or engineer’s obligation to test the intended geomembrane in the environment in which it will be used. Layfield has no control of that environment. Layfield will be happy to provide samples of geomembrane materials suitable for chemical testing upon request from our customers.

Some additional manufacturer’s test data is available from Layfield that may not be shown here. If you have additional questions on chemical resistance please contact your Layfield representative.

Note: all tests listed were performed at room temperature. Other temperatures must be tested separately.

Individual results cannot be used to predict the compatibility of geomembrane materials with chemical combinations or mixtures.