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On February 1, 2022, Hexion Holdings Corporation announced that it has completed the sale of its Coatings and Composite businesses, which includes the epoxy specialty resins and base epoxy resins and intermediates product lines, to Westlake Chemical Corporation. For epoxy coatings and composite product inquiries, please contact customer service at https://www.hexion.com/en-US/company/contact/ or Service@hexion.com.

SF 7008 Flame Retardant Epoxy 828 505

Description

Flame Retardant Epoxy Premix Molding Compound
EPON™ Resin 828 / HELOXY™ Modifier 505

Introduction

This formulation illustrates the preparation of a stable, low cost, flame retardant epoxy premix, molding compound. It is based on a stress relieving epoxy resin and modified with a vinyl chloride polymer to eliminate binder “squeeze-out” at the mold part line. Parts molded with this compound exhibit good thermal shock resistance.

 

Suggested Uses

  • Electrical component encapsulation, such as motors and coils requiring up to 5 pounds of compound per unit
  • Foundry sand-core boxes, pipe fittings and cases

 

Formula

Material

Supplier

Pounds

Gallons

 

EPON Resin 828

Hexion

90

9.32

 

HELOXY Modifier 505

Hexion

10

1.17

 

Geon 440 x 24

B. F. Goodrich Co.

9

0.77

 

Black Iron Oxide

Akrochem Corp.

9

0.22

 

Candelilla Wax (powdered)

Cornelius Wax Refining Co.

3

0.43

 

ASP 101 Aluminum Silicate

J. M. Huber Corp.

91

4.23

 

Novacite 325 Silica

Malvern Chemicals Co.

227

10.09

 

Tetrachlorophthalic Anhydride

Monsanto Co.

84

5.15

 

Zinc, Stearate, (powdered)

Witco Chemical Corp.

9

0.99

 

1/8-inch Chopped Glass, with compatible finish

Owens Corning Fiberglas Co.

28

1.33

 

 

 

560

33.70

 

Typical Handling Properties

Table 1 / Handling Properties

 

Form

fiber-filled cake, extruded rope, or preform

 

 

 

 

 

Density

lbs/gal

16.7

 

Color

 

black

 

 

 

 

 

Spiral Flow (EMMI 1-66) at 1000 psi/150 °C

Storage 23 °C

Temperature 38 °C

 

Initial

43

43

 

1 week

38

37

 

2 weeks

35

32

 

3 weeks

35

28

 

4 weeks

35

25

 

5 weeks

35

24

 

Compounding

Blend the epoxy resins and Geon 440 x 24 in a high shear mixer with a heating/cooling jacket, such as a J. H. Day Mixtruder. Heat to 107° or 121 °C and continue agitation until the vinyl polymer dissolves. Add and disperse the pigments and fillers while lowering the batch temperature to 79 °C or below. Then add candelilla wax and zinc stearate, and disperse thoroughly.Maintain the temperature at 79 °C, and add the tetrachlorophthalic anhydride and choppedglass fibers. For structural applications, use additional glass fibers up to 1-inch in lengthfor increased impact resistance. Continue mixing, for 5 to 10 minutes, until all components are thoroughly wetted out. Discharge into shallow trays to cool and cover with plastic filmto prevent hydrolysis of the anhydride by atmospheric moisture. Store the premix as a loosecake, extruded rope, or preforms in sealed containers under refrigeration or at normalroom temperature.

 

Molding

This premix can be transfer or compression molded. Transfer pressures ranging from 500 to 1000 psi at mold temperatures ranging from 135 to 180°C are typical. Practical press cycles at these temperatures are 1 to 5 minutes in duration. Dielectric preheating will facilitate low pressure transfer molding.

 

Typical Cured State Properties

Table 2 / Cured State Properties1

 

 

Units

Value

 

Tensile Strength, Ultimate

psi

6,500

 

Tensile Elongation

%

0.3

 

Tensile Modulus, Initial

ksi

2100

 

Flexural Strength, Ultimate

psi

12,500

 

Flexural Modulus, Initial

106psi

1.5

 

Compressive Strength, Ultimate

psi

21,400

 

Izod Impact, notched

ft•lb/in.

0.4

 

Water Absorption 2

%

0.04

 

Weight Loss 3

%

0.46

 

Flame Retardancy per ASTM D-635

 

self-extinguishing 4

 

Linear Shrinkage

inch/inch

0.007

 

 

 

 

 

Electrical Properties

 

 

 

Volume Resistivity

 

 

 

at 23°C

ohm•cm

3(10)15

 

at 66°C

ohm•cm

7(10)14

 

at 93°C

ohm•cm

4(10)14

 

at 130°C

ohm•cm

8(10)13

 

at 150°C

ohm•cm

4(10)12

 

at 180°C

ohm•cm

9(10)10

 

 

 

 

 

At 60 Hertz

Dielectric Constant

Dissipation Factor

 

at 25 °C

4.56

0.004

 

at 40 °C

4.60

0.007

 

at 60 °C

4.66

0.010

 

at 80 °C

4.82

0.012

 

at 100 °C

5.00

0.017

 

at 120 °C

4.59

0.031

 

at 140 °C

4.94

0.035

 

at 160 °C

6.08

0.047

                                                                            1 Determined on specimens that were press cured for 3 minutes at 150 °C and 1,000 psi.

                                                                            2 Percent weight gain after immersion for 24 hours at 25 °C.

                                                                            3 Percent weight loss determined over 24 hours at 150 °C.

                                                                            4 A non-burning rating can be achieved by incorporating 5 parts by weight of antimony oxide into the formulation.

 

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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