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Technical Data Sheet

 

Re-issued September 2005

 

 

EPON™ Resin 8281

 

 

Product Description

EPON™ Resin 8281 was developed for use in formulating highly filled compounds, particularly those with high levels of silica-type fillers. This resin allows the formulator to compound materials suitable for use in a wide variety of products, including adhesives, electrical encapsulants and molding compounds, tooling compounds, and most construction end uses

 

 

Application Areas/Suggested Uses

  • Electrical encapsulation
  • High solids coatings
 

 

Benefits

  • Excellent resistance to pigment and filler settling
  • Low saponifiable chlorine level
  • Superior resistance to foaming under vacuum
  • Viscosity stability comparable to other conventional liquid EPON Resins

 

Sales Specification

Property

Units

Value

Test Method/Standard

Weight per Epoxide

g/eq

182 – 195

ASTM D1652

Viscosity at 25°C

P

110 – 140

ASTM D445

Color

Gardner

1 max.

ASTM D1544

 

 

 

 

 

Typical Properties

Property

Units

Value

Test Method/Standard

Density at 25°C

lb/gal

9.7

ASTM D1475

Saponifiable chlorine

% wt.

0.027

 

Water content

% wt.

0.034

 

Sodium content

ppm

0.1

 

Potassium content

ppm

0.6

 

Iron content

ppm

<0.1

 

Epichlorohydrin content

ppm

1 max.

 

 

 

 

 

 

 

Processing/How to use

 

General Information

Formulations using EPON Resin 8281 meet the requirements of the electronics industry for electrical and dimensional stability, high physical strength, excellent chemical resistance and good electrical properties

 

Filler Settling Characteristics

EPON Resin 8281 exhibits superior resistance to filler settling. In the most severe test, 72 hours at 60 °C, EPON Resin 8281 exhibited no settling of filler. This was measured by incorporating 50% by weight silica filler, under high shear conditions, into EPON Resin 8281. After evacuating the entrapped air, the mixture was placed in a 60 °C oven for 72 hours. The mixture was removed from the oven and by use of a metal stirring rod, tested for any filler build-up on the bottom or sides of the container.

 

 

Performance Properties

 

Table 1 / EPON Resin 8281 – Properties of Cured Castings 1

 

Method

Units

A

B

C

EPON Resin 8281

 

pbw

100

100

100

EPIKURE™ Curing Agent 3234 (TETA)

 

pbw

14

---

---

ANCAMINE™ Y 2

 

pbw

---

25

---

Methyl tetrahydrophthalic anhydride (MTHPA)

 

pbw

---

---

80

2-ethyl-4-methylimidazole (EMI-24)

 

pbw

---

---

0.5

 

 

 

 

 

 

Cure Schedule

 

hr/°C

24 / 23 +

2 /150

2 / 80 +

4 / 150

2 / 105 +

4 / 150

 

 

 

 

 

 

Cured State Properties

 

 

 

 

 

Tg by DSC – midpoint

ASTM D648

°C

140

172

153

Tensile Strength

ASTM D638

 

 

 

 

at 25°C

 

psi

10,200

12,300

11,700

at 100°C

 

psi

4,100

7,600

6,000

Tensile Elongation

 

 

 

 

 

at 25°C

 

%

6.0

7.9

7.9

at 100°C

 

%

8.4

8.3

6.4

Tensile Modulus

 

 

 

 

 

at 25°C

 

ksi

41

41

45

at 100°C

 

ksi

27

31

41

Flexural Strength

ASTM D790

psi

16,600

18,500

19,800

Flexural Modulus

 

ksi

48

46

49

Compressive Strength

 

psi

15,300

17,400

15,900

Compressive Deformation

 

psi

19.0

19.1

19.1

Compressive Modulus

 

ksi

30

27

32.6

Coefficient of Thermal Expansion

TMA

 

 

 

 

at -25 to 75°C

 

ppm/°C

66

61

69

at 150 to 200°C

 

ppm/°C

171

158

181

Density @ 22°C

 

g/ml

1.18

1.19

1.20

 

 

 

 

 

 

Chemical Resistance 3

 

 

 

 

 

24 hr - water boil

 

%

0.44

1.0

2.3

3 hr - actone boil

 

%

1.2

0.93

0.73

 

 

 

 

 

 

Electrical Properties

 

 

 

 

 

Dielectric Constant, 1 MHz

ASTM D150

 

3.5

3.9

3.4

Dissipation Factor, 1 MHz

 

 

0.029

0.033

0.015

Volume Resistivity @23°C

 

ohm•cm

2 x 1016

4 x 1016

3 x 1016

Surface Resistivity @23°C

 

ohm•cm

13 x 1016

19 x 1016

26 x 1016

 

 

 

 

 

 

1 Typical for unfilled, 1/8 inch castings prepared with amine and anhydride curing agents.

2 Available through Air Products.

3 Percent weight gain after immersion

 

 

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.

 

This particular resin is quite stable and does not exhibit increased viscosity if stored at or below 120 °F. However, it is recommended that this resin be stored in a cool place in tight, sturdy containers away from sparks and open flames

 

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.

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