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EPON 8021
Low Viscosity Resin Possessing Excellent Wetting Characteristics, Rapid Reaction Rates
EPON 8021 is a very low viscosity resin possessing excellent wetting characteristics and rapid reaction rates with aliphatic amine curing agents over a broad temperature range. This combination of properties makes EPON Resin 8021 an excellent choice for use in adhesives for bonding difficult-to-wet substrates, low temperature applied flooring compounds, rapid setting sealing compounds, and pressure injection systems. Aliphatic amine cured EPON Resin 8021 compositions are characterized by tough flexible cures reflecting a good combination of mechanical properties. As a modifier for basic liquid epoxy resins, this resin imparts to the composition a unique combination of reduced viscosity, fast cure, and flexibility. The excellent wetting characteristics of this resin are readily apparent when applied in bondline thicknesses to metal, plastic, damp concrete, and other difficult-to-wet substances. This property is manifest in exceptionally high bond strength to many such materials.
EPON 8021 General Information
EPON 8021 is a highly reactive multifunctional resin containing both epoxide groups and reactive unsaturation. Unlike conventional epoxy resins, polymerization can occur with moderate heating. The temperature of EPON 8021 should not exceed 50 °C during storage, mixing or grinding operations. The use of typical epoxy diluents or alkaline fillers with this resin may also result in polymerization. Therefore, it is important that any modifier be carefully screened prior to commercial use with EPON 8021. Equivalent weight based on reaction with amine-active hydrogen 150. The extremely low viscosity of this epoxy resin permits higher filler loadings, eliminates the need for reactive diluents, and provides for suitable working characteristics at lower application temperatures than conventional epoxy resins. EPON 8021 was designed to be cured with aliphatic amines. Suitable curing agents for use with this resin include EPI-CURE™ 3282 and 3271 Curing Agents as well as the unmodified polyethylene amines, such as triethylenetetramine. For optimum property development, the preferred combining ratio is calculated on the basis of one amine-active hydrogen equivalent per 150 parts by weight EPON 8021. Polyamide curing agents, amidoamine curing agents, aromatic amine curing agents, mercaptans, and anhydrides can also be used to cure EPON 8021. However, generally soft, low strength thermosets are obtained when using these types of curing agents. Catalytic curing agents such as boron trifluoride complexes, dicyandiamide, and tertiary amines are not recommended for use with this resin. When cast in thin films, systems based on EPON Resin 8021/aliphatic amine curing agent combinations form smooth, continuous coatings free of cratering, crawling and residual surface tackiness. Such systems are less prone to form “sweat-out” when applied in thin film than are similar systems based on conventional bisphenol A based epoxy resins. Epoxy compounds based on EPON 8021 possess unusually low exotherm temperatures for their reactivity class. This combination of high reactivity and moderate exotherm suggests the use of this resin in splicing and sealing compounds.
Sales Specification
| Property | Units | Value | Test Method/Standard |
| Weight per Epoxide | g/eq | 300 – 320 | ASTM D1652 |
| Viscosity at 25°C | cP | 85 – 115 | ASTM D445 |
| Color | Gardner | 1 max. | ASTM D1544 |
Typical Properties of EPON 8021
| Property | Units | Value | Test Method/Standard |
| Density at 25°C | lb/gal | 9.2 | ASTM D1475 |
| Combining Equivalent Weight | 150 | ||
50+ years of Industry Expertise at your service
Miller-Stephenson is an EPON 8021 supplier and certified from Hexion for direct distribution, technical support, and formulation modifications. We also have a long history in numerous epoxy resins industries, and Hexion’s EPON brand of products are respected around the world for quality and reliability. When you purchase Miller-Stephenson epoxy resins you not only get industry-leading products, you also gain access to our many years of direct production floor experience. We understand your production issues and can help you optimize your epoxy design and maintenance and to improve your bottom line.
Miller-Stephenson also offers an exceptional epoxy release agent with our ReleaSys EP5.
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The recommendation made here with and the information set forth with respect to the performance or use of our products are believed, but not warranted to be accurate. The products discussed are sold without warranty, as to fitness or performance, express or implied and upon condition that purchasers shall make their own test to determine suitability of such products for their particular purposes. Likewise, statements concerning the possible uses of our products are not intended as recommendations to use our products in the infringement of any patent.