Print Version (PDF) [ close ]   

Technical Data Sheet

 

Re-issued September 2005

 

 

EPON™ Resin 8280

 

 

Product Description

EPON™ Resin 8280 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 Resin 8280 amine-cured systems are given below.

 

 

Application Areas/Suggested Uses

  • Adhesives
  • Electrical encapsulation
  • High solids coatings
  • Vacuum processing
 

 

Benefits

  • Low foaming
  • High resistance to filler settling
  • Controlled reactivity with amine curing agents

 

Sales Specification

Property

Units

Value

Test Method/Standard

Weight per Epoxide

g/eq

185 – 195

ASTM D1652

Viscosity at 25°C

P

110 – 150

ASTM D445

Color

Gardner

1 max.

ASTM D1544

 

 

 

 

 

Typical Properties

Property

Units

Value

Test Method/Standard

Specific gravity @ 20°C

g/ml

1.168

 

Density at 20°C

lb/gal

9.7

ASTM D1475

Refractive index @ 25°C

 

1.570-1.575

 

 

 

 

 

 

 

 

 

 

 

Processing/How to use

 

General Information

Low Foaming Tendencies

EPON Resin 8280 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 Resin 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.


 

Performance Properties

 

Table 1 / Typical Properties of EPON™ Resin 8280 – Unfilled Castings

 

Method

Units

A

B

C

EPON Resin 8280

 

pbw

100

100

100

EPIKURE™ Curing Agent 3223 (DETA)

 

pbw

11

 

 

Metaphenylenediamine (MPDA)

 

pbw

 

14.4

 

Hexahydrophthalic Anhydride (HHPA) 1

 

pbw

 

 

82.5

 

 

 

 

 

 

Cure Schedule

 

hr/°C

24 / 23 +

2 /150

2 / 80 +

2 / 150

2 / 90 +

4 / 150

 

 

 

 

 

 

Cured State Properties

 

 

 

 

 

Heat Deflection Temperature

ASTM D648

°C

131

156

131

Tensile Sstrength

ASTM D638

 

 

 

 

0.2% offset

 

psi

5,000

5,400

6,800

Ultimate

 

psi

10,300

12,900

12,300

Tensile Elongation

 

 

 

 

 

0.2% offset

 

%

1.3

1.4

1.7

Ultimate

 

%

5.3

6.8

5.8

Tensile Modulus

 

ksi

420

470

450

Flexural Strength

ASTM D790

psi

14,100

16,900

17,900

Compressive Strength

 

 

 

 

 

0.2% offset

 

psi

6,900

8,900

11,400

At yield

 

psi

16,600

18,900

16,900

Compressive Deformation

 

 

 

 

 

0.2% offset

 

%

1.7

2.0

2.5

At yield

 

%

9.8

9.1

6.1

Compressive Modulus

 

ksi

450

470

490

Izod Impact, notched

ASTM D256

ft.•lb./in.

0.47

0.49

0.38

 

 

 

 

 

 

Chemical Resistance 2

 

 

 

 

 

24 hr - water boil

 

%

1.1

0.82

0.65

3 hr - actone boil

 

%

0.25

0.37

1.59

 

 

 

 

 

 

1 Plus 1 phr BDMA.

2 Percent weight gain after immersion.


 

Figure 1 / Filler Settling Resistance for Three Resin Systems 1

EPON 8280 Figure 1

 

 

Test Method

As defined in “A Simple Pigment-Settling Gage and A Simple Anti-Sag Test,” Temple C. Patton (Baker Castor Oil Co.). Official Digest, Federation of Paint and Varnish Production Clubs, January 1957.

1 Each system comprised of 44% wt. resin, 6% wt. low viscosity monoepoxide diluent, 50% wt. finely divided silica

 

 

Safety, Storage & Handling

Please refer to the MSDS for the most current Safety and Handling information.

 

Please refer to the Hexion web site for Shelf Life and recommended Storage information.

 

Exposure to these materials should be minimized and avoided, if feasible, through the observance of proper precautions, use of appropriate engineering controls and proper personal protective clothing and equipment, and adherence to proper handling procedures. None of these materials should be used, stored, or transported until the handling precautions and recommendations as stated in the Material Safety Data Sheet (MSDS) for these and all other products being used are understood by all persons who will work with them. Questions and requests for information on Hexion Inc. ("Hexion") products should be directed to your Hexion sales representative, or the nearest Hexion sales office. Information and MSDSs on non-Hexion products should be obtained from the respective manufacturer.

 

Packaging

Available in bulk and drum quantities.

 

 

Contact Information

For product prices, availability, or order placement, please contact customer service:

www.hexion.com/Contacts/

 

For literature and technical assistance, visit our website at: www.hexion.com

 

® and ™ Licensed trademarks of Hexion Inc.

DISCLAIMER

The information provided herein was believed by Hexion Inc. (“Hexion”) to be accurate at the time of preparation or prepared from sources believed to be reliable, but it is the responsibility of the user to investigate and understand other pertinent sources of information, to comply with all laws and procedures applicable to the safe handling and use of the product and to determine the suitability of the product for its intended use. All products supplied by Hexion are subject to Hexion’s terms and conditions of sale. HEXION MAKES NO WARRANTY, EXPRESS OR IMPLIED, CONCERNING THE PRODUCT OR THE MERCHANTABILITY OR FITNESS THEREOF FOR ANY PURPOSE OR CONCERNING THE ACCURACY OF ANY INFORMATION PROVIDED BY HEXION, except that the product shall conform to Hexion’s specifications. Nothing contained herein constitutes an offer for the sale of any product.

Print Version (PDF) [ close ]