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.
This product is suitable for use in powder coatings.
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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:
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.
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.
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.
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MSDS should be obtained from suppliers of other materials recommended in this bulletin.
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D.E.H.™ is a trademark of Dow (“Dow”) or an affiliated company of Dow.
The suggestions and data in this document are based on information we believe to be reliable. They are offered in good faith, but without guarantee, as conditions and methods of use of our products are beyond our control. The prospective user is responsible for determining whether our products and the information in this document are appropriate for your use, and for ensuring your workplace and disposal practices are in compliance with applicable laws and other governmental requirements. These suggestions and data are based on information we believe to be reliable. They are offered in good faith, but without guarantee, as conditions and methods of use of our products are beyond our control. We recommend that the prospective user determine the suitability of our materials and suggestions before adopting them on a commercial scale.
Suggestions for uses of our products or the inclusion of descriptive material from patents and the citation of specific patents in this publication should not be understood as recommending the use of our products in violation of any patent or as permission or license to use any patents of Dow.