For Formulating Filled Compounds For a Wide Variety of Structural Applications, Superior Resistance To Foaming Under Vacuum
EPON 8280 Modified Liquid Epoxy Resin has been designed especially for formulating filled compounds for a wide variety of structural applications, including bonding, electrical encapsulating, tooling, flooring and most construction uses. EPON Resin 8280 is a low molecular weight resin with outstanding resistance to pigment and filler settling, which gives greater stability to filled systems. The resin also has superior resistance to foaming under vacuum and has an adjusted, controlled reactivity with amine curing agents, which serves to extend pot Iife and working life characteristics. In addition, viscosity stability — often a problem in anti-settling resins — presents no problem for EPON Resin 8280. It is as good in viscosity stability as other conventional liquid EPON Resins. Furthermore, it yields products with high physical strength, excellent chemical resistance and good electrical properties. Typical properties for several EPON 8280 amine-cured systems are given below.
Application Areas/Suggested Uses
- Electrical encapsulation
- High solids coatings
- Vacuum processing
- Low foaming
- High resistance to filler settling
- Controlled reactivity with amine curing agents
|Weight per Epoxide|
185 – 195
|Viscosity at 25°C|
110 – 150
|Specific gravity @ 20°C|
|Density at 20°C|
|Refractive index @ 25°C|
Processing/How to use
Low Foaming Tendencies
EPON Resin 8280 Modified Liquid Epoxy Resin possesses the ability to inhibit foaming during out-gassing in vacuum processing applications. It also has a tendency to reduce bubbles and voids at ambient pressures.
Controlled Reactivity with Amine Curing Agents
The reactivity of EPON 8280 is controlled to provide more uniform reactivity between lots and greater ease of handling to the user. The reactivity is similar to undiluted resins,
e.g., EPON Resin 828.
Resistance to Filler Settling
When compared to standard liquid epoxy resins, EPON Resin 8280 exhibits improved resistance to silica filler settling. This is illustrated in Figure 1, which reflects testing of EPON Resin 8280 and two other systems under three different conditions — 3 hours at 95 °C; 10 hours at 95 °C; and 72 hours at 60 °C. All three systems were prepared using finely divided silica. The curves in Figure 1 plot the depth of the settled layer excluding zero settling. The greater the curvature of the line, the softer the settling layer, and therefore, the more easily redispersed.
In the 3 hour test, EPON Resin 8280 showed virtually no settling, where the other two systems exhibited a small but hard layer of filler settling. In the 10 hour test, the EPON Resin 8280 system showed a shallow layer of soft settle, while the other two produced deeper and harder layers. In the most severe test, 72 hours, the EPON Resin 8280 system still exhibited a shallow layer of soft settling while the other two systems showed the same or a greater degree of disparity.
Settling tendency was also tested for seven days at 25 °C (not shown in Figure 1). In this test, EPON Resin 8280 exhibited a negligible amount of soft settling, whereas with other systems tested, about half the filler content had settled in a hard layer.
Miller-Stephenson is an Epon 8280 Supplier and certified from Hexion for direct distribution, technical support, and formulation modifications. For Technical Service Question please click here
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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.