Tip for today.Epoxy.com Novolac Epoxy

June 28, 2012

Tip for today:  Epoxy.com #633 has excellent chemical resistant properties. http://www.epoxy.com/633.aspx We recently had an inquiry with the installed product coming in contact with hundreds of gallons of sulfuric acid in a major spill situation.  We were contacted to see if Epoxy.com #633 had been compromised. The answer is no.  As long as the material has been properly installed without pinholes, all that is required is decontamination of the exterior surface of Epoxy.com #633 coating.  No removal or reinstallation of Epoxy.com # 633 will be required. Epoxy.com #633 is specially formulated to prevent a spill from become a catastrophe.

That was a great question.  Please keep your questions coming.

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Epoxy.com Epoxy Material Calculators

June 20, 2012

Epoxy.com calculators are designed for busy professional estimators who wants to quickly and accurately calculate the amount of epoxy or epoxy like material for their job.

Epoxy Coating Spread Rate Calculator shows how much 100% solids epoxy coating  you will need for your installation.

Epoxy Dowel  Bar and Anchor Bolt Adhesive Calculator shows the amount of epoxy adhesive you will need to install dowel bars into concrete or wood.

Epoxy Stone Overlay Calculator figures the amount of epoxy adhesive resin your will need to do an epoxy stone overlay.

Epoxy Table Top Resin Calculator  figures the amount of epoxy table top resin you will need to do a table or bar top.

Epoxy Tile Grout Calculator is used to calculate the amount of epoxy tile grout that you need for a specific tile size and joint spacing.

Electrical Epoxy Calculator is used to calculate the amount of epoxy you will need to encapsulate electrical components.

Epoxy.com Conductive Flooring Calculator figures how much material you will need to install a conductive epoxy flooring system.

Is there another Epoxy.com product calculator that you would like to have here, send your suggestions to Norm Lambert – Epoxy.com Technical Director at norm@epoxy.com.


Epoxy Education- The Strengths of Epoxy

June 18, 2012

Epoxy Educational Pages Anouncement:

The newest addition to Epoxy.com Education Pages is “Epoxy Resin Strengths Explained” which explains the 4 primary strengths that are very important for most civil and mechanical engineering applications of epoxy: compressive strength, tensile strength, flexural strength, and bond strength. “Epoxy Resin Strengths Explained” also discusses the test methods to measure these strengths.


Epoxy Installation Terminology

June 8, 2012

Epoxy.com technical support staff gets asked a lot about epoxy terminology. This page deals with the terms associated with epoxy  installation times.  Specifically “Epoxy Pot Life” sometimes called the epoxy’s “Working Time“, “Tack Free Time“, “Initial Cure”,  and “Final Cure” sometimes called the epoxy’s “Full Chemical Cure“.  Keep in mind that all of the information below assumes that the epoxy has been properly measured and mix. The information is specificall based on Epoxy.com Products, but is typically true about many 100% solids epoxies.

Epoxy Pot Life aka Working Time

The “Pot Life” of epoxy is the time that it takes for it to start gelling in the in the mix vessel (typically a bucket). One important thing to remember is that this is done by a standard which is 200 grams of the material at a given temperature typically 70° F or 77° F. So remember that the bigger you make the  batch of Epoxy.com resin, the faster the batch will set.  See the Epoxy Pot Life Page for more details.

Epoxy Tack Free Time

The “Tack Free Time” of the epoxy is pretty much just what it sounds like.  It is the time that the epoxy is no longer sticky to the touch. When the epoxy is “Tack Free” it can be handle or even walked on if necessary, but you will want to be careful because the epoxy will be very vulnerable to scratching right after it becomes “Tack Free”. The “Tack Free Time” given on the product’s Epoxy.com technical data sheet is also at a specific temperature, typically 77°F.

Epoxy Initial Cure Time

The “Initial Cure” is not the same as “Tack Free“.  Typically “Initial Cure” is about twice as long as the Tack Free Time. Most epoxies have about 80% of the epoxy’s final cure at “Initial Cure“. After the Epoxy’s “Initial Cure” the epoxy is still vulnerable to scratching, but typically strong enough that these scratching will be strictly esthetic and not structural. In cases where time permits and esthetics are essential you may want to wait 1.5 to 2 times the “Initial Cure” of the epoxy before you allow heavy traffic or rougher handling. The primary outside force that can effect this time is temperature. The epoxy’s “Initial Cure” time assumes the temperature indicated on the technical data sheet, or 77° F. if not otherwise specified.

Final Cure aka “Full Chemical Cure”

When the epoxy has reached its “Final Cure” it has achieved the strengths indicated on the Epoxy.com technical data sheet. It also means that the epoxy has reached its full water resistance and full chemical resistance. This time also is also effected by temperature, similar to all the other times listed above. One interesting note is that “Final Cure” when the epoxy is 99% cured.  Epoxy will continue to harden for as much as a year.  So  the “Final Cure” for epoxy is like the “28 day” cure on concrete.  It is typically said that the concrete is fully cured in 28 days.  In fact concrete will under the right conditions continue to cure for up to 100 years.

For more information email me at
norm@epoxy.com
  or visit Epoxy.com “Where to Start” Page for more information.

Norm Lambert
President & Director of Technical Support
Epoxy Systems, Inc Florida & Vermont USA
Available by Phone M-F 9AM-4PM Eastern Time (6 AM – 1 PM Pacific Time)
352-533-2167 (Voice)
352-465-3497 (fax)
norm@epoxy.com
www.epoxy.com
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Pot Life of 100% Solids Epoxy

June 7, 2012

As the Technical Support Director of Epoxy.com  I get a lot of email and phone calls about how to work with the relatively short potlife (typically 30-40 minutes) of 100% Solids Epoxy and similar resin systems.

It is important to understand that  Epoxy (and epoxy like resins) generate their own heat when mixed. So larger batches of epoxy  will generate more heat then smaller ones. The result of this is that larger batches of epoxy set faster than smaller batches. Start by mixing smaller batches of epoxy and then increase your batch size slowly.

To give you longer working times:

  • Make small batches that you can use in about 1/2 the working time of the material.  That will give you a little wiggle room and it will make your epoxy easier to use.
  • Be sure the product is cool when you mix it.  For best handling properties I like my material in the upper 60’s or lower 70’s. F.

See To Do With Epoxy for more installation tips.

Norm Lambert – Epoxy.com Technical Support Director


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