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Epoxy Coatings

Mil –Spec Type ER

Epoxy coatings are generally packaged in two parts that are mixed prior to application. The two parts consist of:

  1. An epoxy resin which is cross-linked with
  2. A hardener

Epoxy coatings are formulated based upon the functional performance requirements for the end product. There are many types of epoxies with varying properties. Epoxies produce a hard, chemical and solvent resistant finish. They are typically used on concrete and steel to give resistance to water, alkali and acids. It is the specific selection and combination of the epoxy component and the hardener component that determines the final characteristics and suitability of the epoxy coating for a given environment. Unmixed epoxies have a long shelf-life. Fast drying-units can be handled in a short period of time.

Applications of Epoxy Coatings

  • Aerospace applications
  • Electrical systems and electronics
  • PCB-Printed Circuit Boards
  • Electronics Potting
  • Marine applications
  • Military
  • Paints and coatings
  • Adhesives
  • Industrial tooling and composites
  • Consumer Products
  • Biology

Typical Properties of Epoxy Coatings

Note: Epoxies vary greatly in their properties and from manufacturer to manufacturer

Characteristic Value Test Method
Specific Gravity 1.2 to 2.0 ASTM D 972
Gloss 2 – 100% ASTM D 523
Impact Up to 160 in. lbs. ASTM D 2794
Flexibility 180, ¼” mandrel ASTM D 522
Pencil Hardness > H ASTM D 3363
Crosshatch Adhesion 100% ASTM D 3363 Method B
Salt Spray +1,000 hours ASTM B 117
Humidity Resistance +1,000 hours ASTM D 2247

Chemical Resistance

Note: The Tables below represent typical values. Epoxies may differ widely from product to product and from manufacturer to manufacturer. Please consult the manufacturer or applicator for accurate data.

Acids & Alkalis

E - Excellent; no attack
G - Good; no significant attack
F - Minor attack; testing required
N - Not recommended
* - Also Nitrates and Sulfates

Chemical Concept 70°F 180°F Concentration 70 Deg F 180 deg F
Acetic 10% F F
Acetic Glacial   N N
Benzene Sulfonic 10% E E
Benzoic   E E
Boric   E E
Butyric 100% N N
Chloracetic 10% E E
Chromic 5% F N
Citric 10% E N
Fatty Acids   E E
Formic 90% E F
Hydrobromic 20% G G
Hydrochloric 20% E G
Hydrocyanic   E E
Hydroflouric 20% G G
Hypochlorous 5% F N
Lactic 5% F N
Maleic 25% E E
Nitric 5% E G
Nitric 30% G N
Oleic   E E
Oxalic   E E
Phosphoric   G F
Picric   G F
Stearic   E E
Sulfuric 50% G F
Sulfuric 80% F N
Tannic   E E
Ammonium Hydroxide   E G
Calcium Hydroxide   E E
Potassium Hydroxide   E E
Sodium Hydroxide   E E

Chemical Concentration 70 Deg F 180 deg F
Acid Salts:      
Aluminum Sulfate   E E
Ammonium Chloride*   E E
Copper Chloride*   E E
Iron Chloride*   E E
Nickel Chloride*   E E
Zinc Chloride*   E E
Alkaline Salts:      
Barium Sulfide   E E
Sodium Bicarbonate   E E
Sodium Carbonate   E E
Sodium Sulfide   E E
Trisodium Phosphate   E E
Neutral Salts:      
Calcium Chloride* E E   E E
Magnesium Chloride*   E E
Potassium Chloride*   E E
Sodium Chloride*   E E
Alcohols   E E
Aliphatic Hydrocarbons   E E
Aromatic Hydrocarbons   E E
Chlorinated Hydrocarbons   F F
Ketones   F F
Ethers   F F
Esters   F F
Gasoline   E E
Carbon Tetrachloride   E E
Aniline   G N
Benzene   E E
Formaldehyde 37% 37% E G
Phenol 5% 5% G F
Mineral Oils   E E
Vegetable Oils   E E
Chlorobenzene   G N