Everyone’s Guide to Epoxy
Our Eco-Polymers are:
- Environmentally Safe
- 100% solids hybrid with no solvents
- Provide Excellent Chemical & Heat resistance
Epoxies made with Bis F, a Bis F and novolac mixture, or Novolac resin exhibit greatly improved chemical and heat resistance compared to the much more common Bis A epoxies. Probably 98% of all epoxies are ‘regular’ Bis A epoxies. Assume Bis A epoxy unless specifically told otherwise.
Novolac epoxies are more expensive than regular epoxies. They exhibit higher ‘heat distortion temperatures’, higher ‘T sub G temperatures’ (both of these are measures of when the epoxy begins to soften with heat). The values for these measurements vary slight with the different resins, and by whether the vendor reports conservative values or optimistic numbers. Generally Bis A epoxies will begin to soften in the 120-160 degree F range. Novolac epoxies initially raise this value by about 25 degrees F.
More important is what happens above this temperature. All epoxies will reharden when the elevated temperatures fall below this transition temperature. However, Bis Novolac epoxies will continue to cure when exposed to temperatures of about 150 degrees F for a few hours. After this ‘additional curing’ they generally can withstand about 300 degrees F (dry environment) without problems.
An exception to this is our non-hazmat novolac epoxy (FC 2100 N). The non-hazmat curing agents used greatly reduce the temperature resistance (but not the chemical resistance). For ‘true’ novolac temperature resistance use our Nova Clear hazmat novolac epoxy. Chemical Resistance: A good quality Bis A epoxy will handle 70% sulfuric acid. A novolac epoxy will handle 97 or 98% sulfuric acid.
ECO-POLYMER epoxies are a new generation of 100% solids, hybrid epoxies. NOVOLAC epoxy coatings are environmentally friendly. Optional epoxy additives (Kevlar™, rubber, ceramic) offer protection against wear and tear, superior impact resistance, and excellent tensile and comprehensive strength.
What is epoxy used for? Eco-Polymer epoxies may be applied to damp or wet surfaces. These epoxies have an outstanding resistance to petroleum products such as: jet fuel, gasoline, and diesel fuel. NOVOLAC epoxies are 4 times more effective against corrosive alkalis, salts, minerals and sewage than traditional epoxies, and have a bonding strength of greater than 3000 PSI.
With today’s modern curing agents, hybrid NOVOLAC resins can be engineered for application by roller, spray or brush. These user friendly epoxies are safe for both the applicator and the environment, contain no solvents or VOC’s, and may be applied in occupied areas.
GETTING YOUR MONEY’S WORTH
The reason for coating and repairing an asset is to extend its service life and provide protection from erosion and corrosion damages of chemicals and wear from abrasion or impingement.
The only way to reduce the price of a coating product is to use inferior resins and or fillers like solvents.
The purchase price of a coating or repair material by it’s self, is a very small part of the overall cost of most project.
Though, purchasing what may appear to be a bargain material at the time, that later proves to causes health problems or fails to provide the proper protection to the asset and shortens is useable life cycle, is the most costly of error.
THE PROBLEMS WITH SOLVENTS
Solvents are carcinogenic, and are therefore regulated in most states, as well as federally by the Environmental Protection Agency (EPA). Not only are solvents hazardous to human health and the environment, but they are one of the primary causes of epoxy coating failures.
The problem occurs as solvents within the epoxy continue to evaporate into the air and water, long after the coating has cured. The evaporation results in permeability issues that allow chemicals to penetrate and damage the epoxy and underlying structure.
CSS has a compiled a report entitled “How Understanding the Benefits of Underwater Epoxy Technology Will Simplify Your Most Demanding WET or DRY Repair and Coating Projects