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SF 7018 General Purpose Potting Compound 828

Description

EPON™ Resin 828

Introduction

This anhydride based formulation is designed for general purpose use in the encapsulation of metal or non-metallic electronic components.

 

Suggested Uses

  • Molded parts such as sand-core boxes for foundry work, pipe fitting, cases, and housings
  • Electrical insulation such as transformer bushings for interior service

 

Formula

Material

Supplier

Pounds

Gallons

 

Resin Portion

 

 

 

 

EPON Resin 828

Hexion

97.10

10.052

 

Cab-O-Sil M-5

Cabot Corp.

2.90

0.166

 

 

Total

100.00

10.218

 

 

 

 

 

 

Converter Portion

 

 

 

 

Hexahydrophthalic Anhydride

Anhydrides & Chemicals, Inc.

77.68

7.846

 

DMP-30

Rohm & Haas Co.

0.05

0.006

 

 

Total

77.73

7.852

 

 

 

 

 

 

Filler Portion

 

 

 

 

Super White Silica

C.K. Williams & Co.

446.66

20.546

 

 

Total

446.66

20.546

 

Typical Handling Properties

Table 1 / Handling Properties

 

 

Units

Value

 

Viscosity at 125 °C 1

cP

5,050

 

Pot Life at 125 °C

hrs

At least 2

 

Density

lbs/gal

16.17

                                                                         1 Brookfield, No. 3 Spindle, 10 RPM

 

Compounding

Stir the Cab-O-Sil into the EPON Resin 828 and heat to 125 °C. Also heat separately the hexahydrophthalic anhydride and the silica to 125 °C. Blend the preheated liquid portions. Stir in the silica, maintaining 125 °C. Add the DMP-30 and heat back up to 125 °C, with stirring. Remove entrained air with vacuum.

 

Application

The material can be poured into any mold, preheated to 125 °C, that has been treated with a suitable high temperature mold release agent; e.g., DC-20 (Dow-Corning Corp.). Material and mold should be maintained at 125 °C. to assure a good pourable viscosity. A suitable cure schedule consists of 2 hours at 125 °C, plus 24 hours at 130 °C.

 

Typical Cured State Properties

Table 2 / Cured State Properties at 25 °C and 110 °C

 

Testing Temperatures

 

 at 25 °C

at 110 °C

 

 

 

 

 

 

 

Units

Value

Value

 

Tensile Strength

psi

12,800

8,100

 

Tensile Elongation

%

0.70

 

Flexural Strength

psi

26,700

16,200

 

Flexural Modulus, Initial

ksi

2110

1920

 

Flexural Deflection

inch

0.08

0.08

 

Compressive Strength, Yield

psi

34,100

10,800

 

Compressive Deflection at Yield

inch

0.21

0.08

 

Izod Impact, notch

ft.•lbs/in.

0.37

 

Hardness, Shore D

Shore D

97

 

Coefficient of Linear Thermal Expansion,

 

 

 

 

from 25 to 90 °C

in./in./°C

 

26.7 x 10-6

 

from 90 to 135 °C

in./in./°C

 

49.9 x 10-6

 

Approximate Transition Temperature, °C

 

 

90

 

 

 

 

 

 

Electrical Properties

 

 

 

 

Volume Resistivity, 1 minute at 500 volts

 

 

 

 

at 25 °C

 

 

7.7 x 1014

 

at 66 °C

ohm•cm

 

8.4 x 1014

 

at 93 °C

ohm•cm

 

4.5 x 1014

 

at 130 °C

ohm•cm

 

2.8 x 1012

 

at 150 °C

ohm•cm

 

3.9 x 1011

 

at 180 °C

ohm•cm

 

2.2 x 1011

 

at 200 °C

ohm•cm

 

2.0 x 1011

 

Dielectric Constant at 25 °C

 

 

 

 

60 cycles

 

 

5.125

 

1 megacycle

 

 

4.393

 

Dissipation Factor at 25 °C

 

 

 

 

60 cycles

 

 

0.091

 

1 megacycle

 

 

0.008

 

Storage

Recommendations regarding storage conditions can be obtained by visiting our web site at www.hexion.com

 

 

General Information

These are starting formulations and are not proven in the user’s particular application but are simply meant to demonstrate the efficacy of the products and to assist in the development of the user’s own formulation.  It is the user’s responsibility to fully-test and qualify the formulation, along with the ingredients, methods, applications or equipment identified herein (“Information”), by the user’s knowledgeable formulator or scientist, and to determine the appropriate use conditions and legal restrictions, prior to use of any Information.

 

Safety, Storage & Handling

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

 

 

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

 

 
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