Determining KEE Content in a Roofing Membrane

NMR Spectra

What is the proper amount of Ketone Ethylene Ester (KEE) to achieve optimum performance properties in a roofing membrane?  This is an interesting question that actually played out over 40-years ago. Yet KEE-lite membranes are entering the market boasting that they too have superior performance just because they use KEE in their vinyl formulation.  It takes time to determine whether or not any product will actually perform at its optimum and we all know that time is brutal.

Before the ink was dry on the ASTM D6754 Standard Specification for Ketone Ethylene Ester (KEE) Based Sheet Roofing there were rumblings to have it pulled because other than DuPont, no one had a legitimate method for determining the KEE content of the roofing sheets.  And DuPont wasn’t about to share its trade secrets.

There is a provision within the ASTM D6754 that defines a KEE membrane as having a minimum KEE polymer content of 50% by weight.  Therefore, unless the content can be measured, anyone can and many do claim compliance with the standard and go unchallenged.

Today’s research front is not on the right amount of KEE, as history has already settled that debate.  Rather it is focused on a methodology to determine the actual KEE content of a membrane.  And here, Seaman Corporation is leading the way.  Seaman has presented testing evidence to ASTM demonstrating a methodology to actually sort the KEE from the KEE-lite materials in the market.

Several techniques have been applied / tried in the past to determine the KEE content of a roofing membrane.  None of them provided the quantification with the accuracy needed to meet the needs of the standard.

The current research path uses nuclear magnetic resonance (NMR) to accurately determine the KEE content of various KEE/PVC blends.  The method has proven accuracy to +/- 10% and there is a good probability that a new test method of KEE Determination will balloted at ASTM this fall.

So questions about any given membrane manufacturer’s claim to conform to the ASTM D6754 Standard will be answered soon enough.  And questions regarding the optimum amount of Elvaloy have been proven through performance.

What has yet to be answered is the performance of today’s KEE-lite membranes and whether or not they will actually stand the test of time.

Add new comment


  • Shortcodes usage

  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.

Enter the characters shown in the image.

About Mr FiberTite

After 10-years in Local 88 out of Canton Ohio, the opportunity to drink the FiberTite Kool Aid came in 1984.  Since then I've been a student as well as a teacher in all manner of roofing with a focus on the engineering, design and installation of thermoplastic single ply roofing systems.  The industry is growing in complexity so there's plenty of opportunity to learn and sharpen your skills no matter who you are.  Hence, one of the most important things I've learned is that "to sharpen the blade, you have to rub steel with steel".


FiberTite® is a Registered Trademark of Seaman Corporation.  The views and opinions expressed on this site are not necessarily those of Seaman Corporation.

NMR Spectra
August 29, 2015

What is the proper amount of Ketone Ethylene Ester (KEE) to achieve optimum performance properties in a roofing... Read More

Comments: 0
August 09, 2015

Before any consideration is given to stepping on a ladder or the roof for that matter, a safety meeting should be... Read More

Comments: 0
Asphalt Compatability using Fibertite
April 03, 2015

Periodically we get questioned on FiberTite’s compatibility with asphalt.  I assume these questions are in response... Read More

Comments: 1
March 29, 2015

This week I took a trip to Cedar Rapids, Iowa to meet and present to what I consider the toughest venue in the... Read More

Comments: 1
March 22, 2015

Yesterday was the first day of spring but the idea that “spring is in the air” hasn’t really materialized.  It’s... Read More

Comments: 0
March 11, 2015

Fear of puncture on a single ply roofing system is probably one of the most pervasive issues that owners express... Read More

Comments: 0
March 05, 2015

Many of the physical property testing methods listed in the various generic membrane standards from ASTM have their... Read More

Comments: 0
Truth Scuff Test
February 15, 2015

This video initially crossed my desk last year but it continues to resurface.  It was produced from our friends at... Read More

Comments: 1
FiberTite Sales Team
February 08, 2015

Just what is a World Class Sales Force and how do you know if you have one.  Personally I believe this is as much a... Read More

Comments: 1
January 31, 2015

In 2011 Mr. Richard Fricklas, one of the roofing industry’s most respected experts, published a short article titled... Read More

Comments: 2
January 23, 2015

The FiberTite Toughness Test has apparently peaked the ire of our friends at GAF.  GAF submitted an article on the... Read More

Comments: 2
January 18, 2015

When purchasing a roof system one of the most important considerations is whether or not the product will be durable... Read More

Comments: 1
January 17, 2015

Just exactly what are the benefits of installing landscaping your roof top?

Some of the justifications for... Read More

Comments: 0
January 10, 2015

When you’re looking for a roofing system, you want one that has the least amount of variables required to ensure... Read More

Comments: 0
DuPont Elvaloy KEE
January 09, 2015

Today the market finds itself facing a new Elvaloy / KEE proposition from a number of manufacturers claiming to know... Read More

Comments: 0