Red Dow Diamond

D.E.H.™ 84
Epoxy Curing Agent


D.E.H.™ 84 Epoxy Curing Agent is a phenolic hardener based on an unmodified solid reaction product of liquid epoxy resin and bisphenol A containing about 2% of a curing accelerator.


D.E.H. 84 Epoxy Curing Agent is a phenolic hardener designed for powder coating applications. It is fully compatible with epoxy resins and can be formulated into decorative or protective powder coatings. White or pastel shade formulations based on D.E.H. 84 Epoxy Curing Agent may exhibit a tendency toward yellowing when subjected to high baking temperatures or to over-bake.

The medium reactivity of D.E.H. 84 Epoxy Curing Agent can be reduced by substituting part of the hardener with D.E.H. 85 Epoxy Curing Agent which contains no curing accelerator. The curing accelerator present in D.E.H. 84 Epoxy Curing Agent tends to promote catalytic cross-linking of the epoxy resin during baking. For this reason, it is suggested that a 20% molar excess of epoxy resin over the hardener may be used when formulating with D.E.H. 84 Epoxy Curing Agent in order to produce cured coatings with optimum properties.

The performance of phenolic cured epoxy powder coating formulations and particularly their adhesion to metal substrates will be greatly affected by the quality of the surface preparation. Suitable pre-treatments such as blast cleaning are suggested.

Typical Applications

This product is suitable for use in powder coatings.

Typical Physical Properties
These properties are typical but do not constitute specifications.




Hydroxyl Equivalent Weight (g/eq)

240 – 270


Color (Gardner)(1)

1 Max.

ASTM D-1544

Melt Viscosity @ 150°C (mPa•s)

290 – 470

ASTM D-4287

Solution Viscosity(1) @ 25°C (cSt)

220 – 280

ASTM D-445

Softening Point (°C)

83 – 90

ASTM D-3104

Water Content (ppm)

4000 Max.

ASTM E-203

Shelf Life (Months)



Product Stewardship

Dow has a fundamental concern for all who make, distribute, and use its products, and for the environment in which we live. This concern is the basis of our Product Stewardship philosophy by which we assess the health and environmental information on our products and then take the appropriate steps to protect employee and public health and the environment. Dow has enduring commitments to Responsible Care® in the management of chemicals worldwide. Our Product Stewardship program rests with every individual involved with Dow products from the initial concept and research to the manufacture, sale, distribution, and disposal of each product.

Customer Notice

Dow encourages its customers and potential users of Dow products to review their applications for such products from the standpoint of human health and environmental quality. To help ensure that Dow products are not used in ways for which they were not intended or tested, Dow personnel are available to assist customers in dealing with ecological and product safety considerations. Your Dow sales representative can arrange for the proper contacts. Dow literature, including MSDS or SDS, should be consulted prior to the use of Dow products.

Medical Application Policy

Dow will not knowingly sell or sample any product or service (“Product”) into any commercial or developmental application that is intended for:

  1. Permanent (long term) contact with internal body fluids or internal body tissues. Long term is a use which exceeds 72 continuous hours;
  2. Use in cardiac prosthetic devices regardless of the length of time involved (cardiac prosthetic devices include, but are not limited to, pacemaker leads and devices, artificial hearts, heart valves, intra-aortic balloons and control systems and ventricular bypass assisted devices);
  3. Use as a critical component in medical devices that support or sustain human life; or
  4. Use specifically by pregnant women or in applications designed specifically to promote or interfere with human reproduction.
Additionally, all Products intended for use in pharmaceutical applications must pass the then current Pharmaceutical Liability Guidelines. For additional information please contact your regular Dow representative.

Food Contact Applications

When properly formulated and cured for food contact applications, this resin will comply with the U.S. Food, Drugs and Cosmetics Act as amended under Food Additive Regulation 21 CFR 175.300 (b)(3)(viii)(a); “Epoxy resins, as basic polymer”. This use is also subject to good manufacturing practices and any limitations specified in each regulation. Please consult the regulations for complete details.

If your applications include food contact requirements, please contact your Dow representative for further information and forthcoming EC regulations. Also consult the Dow data sheet entitled, Food Additive Status for Epoxy Resins, Curing Agents and Epoxy Novolac Resins, Form No. 296-01425.

Regulatory Status

The main component of this phenolic curing agent is registered under CAS # 25036-25-3 and is regarded as a polymer according to Council Directive 92/32/EEC of 30 April 1992; the 7th Amendment of Council Directive 67/548/EEC, and is, therefore, exempt from the European Inventory of Existing Chemical Substances (EINECS). In addition, Dow confirms that the chemicals and intentional additives which form the basis of this product are listed on EINECS.

The curing accelerator, 2-methylimidazole, CAS # 693-98-1, used in this phenolic hardener composition is registered under number 211-765-7 on EINECS.

For more information on the regulatory status of this product, please refer to the MSDS or SDS for this product.

Chemical Inventory Listing

CAS Number(1)


25036-25-3 / 80-05-7 / 693-98-1



Polymer / 201-245-8 / 211-765-7

United States


25036-25-3 / 80-05-7 / 693-98-1



25036-25-3 / 80-05-7 / 693-98-1



25036-25-3 / 80-05-7 / 693-98-1



7-1279 / 4-123 / 5-382



KE-24070 / KE-23982 / KE-24299



25036-25-3 / 80-05-7 / 693-98-1



25036-25-3 / 80-05-7 / 693-98-1

Safe Handling Information

Dow provides its customers with a product specific Material Safety Data Sheet (MSDS) or Safety Data Sheet (SDS) to cover potential health effects, safe handling, storage, use and disposal information. Dow strongly encourages its customers to review the MSDS or SDS on its products and other materials prior to their use.

Notice: This epoxy curing agent is supplied as solid, flaked material in 25 kg polyethylene valve bags. The curing agent should be stored in a cool, dry place in its original closed packaging. Flakes may fuse if subjected to excess heat or compression. Stacking bags of D.E.H. Phenolic Hardener should be avoided whenever possible. Also see the corresponding sales specification or the Dow Technical Bulletin entitled, entitled, Sintering of Low Molecular Weight Solid Epoxy Resins, Form No. 296-01693.

This epoxy curing agent should retain its chemical properties for a period of at least 12 months. For further handling information consult the Dow brochure entitled, DOW Epoxy Curing Agents Product Stewardship Manual, Safe Handling and Storage, Form No. 296- 01331.

Dow Material Safety Data Sheets (MSDS) contain pertinent information that you may need to protect your employees and customers against any known health or safety hazards associated with our products. Under the OSHA Hazard Communication Standard, workers must have access to and understand MSDS on all hazardous substances to which they are exposed. Thus, it is important that you provide appropriate training and information to your employees and make sure they have available to them MSDS on any hazardous products in their workplace.

Dow sends MSDS on non-OSHA-hazardous as well as OSHA-hazardous products to its customers upon initial shipment, including samples. If you do not have access to one of these MSDS, please contact your local Dow representative for a copy.

Updated MSDS are sent upon revision to all customers of record. In addition, MSDS are sent annually to all customers receiving products deemed hazardous under the Superfund Amendments and Reauthorization Act.

MSDS should be obtained from suppliers of other materials recommended in this bulletin.

Dow is a member of the American Chemistry Council and is committed to ACC’s Responsible Care® Program.