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Technical Data Sheet

 

Re-issued August 200

 

 

EPIKURE™ Curing Agent 3370

 

 

Product Description

EPIKURE™ Curing Agent 3370 is a low viscosity, modified cycloaliphatic amine capable of effecting thorough cures in epoxy resin systems at normal room temperature.

 

Application Areas/Suggested Uses

  • Light color castings
  • Chemical resistant glaze, sealer and gel coatings
  • Industrial floor toppings
  • Tank linings

 

Benefits

  • Good overnight cure development
  • Moderate resistance to blush or "sweat-out"
  • High degree of chemical resistance
  • Light color

 

Sales Specification

Property

Units

Value

Test Method/Standard

Amine value

mg/g

384.0-407.0

ASTM D2896

Viscosity at 25°C

cP

85-145

ASTM D2196

Color

Gardner

1

ASTM D1544

 

 

 

 

 

Typical Properties

Property

Units

Value

Test Method/Standard

Equivalent weight, approx.

 

72

 

Density

lbs/gal

8.33

ASTM D1475

Flash point, Setaflash

°F

>200

 

 

 

 

 

 

 

General Information

EPIKURE Curing Agent 3370 is an effective curing agent for many epoxy resins including both reactive diluent-modified and conventional bisphenol A types. Table 1 lists the cured state and handling properties for a typical system cured with EPIKURE 3370. The effects of the lower epoxide functionality of the diluent-containing EPON* Resin 813, EPON 8132, and EPON 8101 are reflected by significant increases in extensibility (flexibility), and decreases in strength modulus and solvent resistance.

 

The resistance of a EPON 828/EPIKURE 3370 system to long term exposure to a variety of chemicals at room temperature is illustrated in Table 2. These data confirm a significant improvement in overall chemical resistance compared to systems cured with typical aliphatic amine-based curing agents.

 

EPIKURE 3370 can be combined with most aliphatic and cycloaliphatic curing agents to modify handling characteristics or cured state performance. Blending with EPIKURE 3271 or EPIKURE 3274 has been found to be particularly effective in altering the reactivity. Ultimate performance characteristics of such combinations depend on the level of modification and the performance profile of the aliphatic amine curing agent selected.

 

In many applications, the excellent cured state properties of epoxy systems cured with EPIKURE Curing Agent 3370 allow for modification with non-reactive diluents to lower the system cost. Laboratory studies have shown that in most cases, properties are not critically affected by modifier concentrations of up to 20 parts by weight per hundred parts of resin (phr). The effects on handling and cured state properties of an EPON 828/EPIKURE 3370 system when modified with 20 phr of various commercially available nonreactive diluents are shown in Table 3.

 

EPIKURE Curing Agent 3370 is hygroscopic. Depending on the surface-to-mass relationship, partially-filled, uncapped containers of this curing agent can absorb as much as ten weight percent of atmospheric moisture during an overnight storage period. Absorbed moisture readily complexes with this curing agent and results in the formation of a "skin" or sludge agglomeration on the surface. Once sludge formation occurs, the curing agent can only be reclaimed by removal of the solid by filtration or by blending it with fresh curing agent and heating to temperatures not to exceed 250 °F until the solid material reliquifies. Therefore, EPIKURE Curing Agent 3370 based systems must be stored in containers with tightly fitted lids to minimize exposure to the atmosphere prior to use.

 

 

Performance Properties

 

Table 1 / Properties of epoxy resin systems cured with EPIKURE Curing Agent 3370

 

Composition

Units

A

B

C

D

E

F

EPON™ Resin 828

pbw

100

80

80

EPON Resin 813

pbw

100

EPON Resin 8132

pbw

100

EPON Resin 8101

pbw

100

HELOXY™ Modifier 48

pbw

20

HELOXY Modifier 505

pbw

20

EPIKURE Curing Agent 3370

pbw

38

38

36

38

40

33

 

 

 

 

 

 

 

 

Handling Properties @ 25°C

 

 

 

 

 

 

 

Viscosity, System

cP

2,000

475

475

460

1,300

1,375

Gel Time, 100 gram mass

min

25

29

41

30

28

35

Peak Exotherm, 100 gram mass

°C

201

190

177

197

160

 

 

 

 

 

 

 

 

Cured State Properties 1

 

 

 

 

 

 

 

Heat Deflection Temperature

°C

56

48

47

54

53

49

Tensile Strength

psi

10,700

8,200

5,200

8,100

10,300

7,000

Tensile Elongation at break

 %

2.5

13.0

50.0

29.0

2.7

23.0

Tensile Modulus

ksi

560

430

260

310

530

350

Flexural Strength

psi

16,200

12,800

7,500

10,400

Flexural Modulus

ksi

560

400

230

300

Flexural deflection

in.

0.18

>0.60

>0.60

>0.60

Compressive Strength, Ultimate

psi

19,200

15,100

19,000

27,000

Compressive Strength, Yield

psi

17,300

14,000

7,800

10,700

Izod impact, notch

ft.•lb./in.

0.42

0.39

0.64

0.54

0.51

0.67

Hardness

Shore D

90

88

84

87

90

50

Glass Bow Shrinkage Test

inch/inch

fail

pass

 

 

 

 

 

 

 

 

Chemical Resistance2

 

 

 

 

 

 

 

Water, distilled

%

0.13

0.20

0.29

0.22

0.17

0.21

5% Acetic Acid

%

0.21

0.29

0.44

0.29

0.41

0.29

Xylene

%

0.05

1.85

7.45

0.03

1.18

1All systems were cured for 7 days at 25 °C.

2Values reported as percent weight gain after immersion for 24 hours.


 

Table 2/Chemical resistance1 of EPON Resin 828 cured with EPIKURE Curing Agent 3370

 

 

1 Day

1 Week

1 Month

3 Months

Water

0.12

0.32

0.65

1.22

5% Detergent

0.10

0.31

0.63

1.18

5% Acetic acid

0.18

0.49

1.03

1.90

20% Acetic acid

1.62

4.54

8.862

Destroyed

50% Acetic acid

6.87

Destroyed

99.7% Acetic acid

5.69

Destroyed

10% Sulfuric acid

0.30

0.74

1.43

2.45

25% Sulfuric acid

0.25

0.67

1.33

2.46

70% Sulfuric acid

0.24

0.44

0.88

1.85

98% Sulfuric acid

Destroyed

5% Nitric acid

0.23

0.59

1.13

2.03

20% Nitric acid

0.46

1.17

2.20

3.84

10% Hydrochloric acid

0.19

0.47

0.91

1.70

10% Sodium hydroxide

0.09

0.26

0.51

0.94

50% Sodium hydroxide

0.00

0.00

-0.06

-0.08

5% Citric acid

0.13

0.34

0.68

1.25

5% Lactic Acid

0.13

0.38

0.72

1.33

Methyl ethyl ketone

Destroyed

Xylene

0.04

0.06

0.09

0.18

Toluene

0.04

0.09

0.19

0.59

Ethanol

0.79

3.06

6.873

Destroyed

Methanol

4.31

Destroyed

Isopropanol

-0.01

-0.01

0.03

0.21

Gasoline

0.03

0.04

0.06

0.11

Antifreeze

0.00

-0.02

-0.05

-0.05

Brake fluid

0.13

0.49

1.58

4.37

Transmission fluid

0.05

0.08

0.10

0.152

Skydrol (500B4)

0.01

-0.01

-0.01

0.03

Bleach

0.10

0.23

0.46

0.92

3% Hydrogen peroxide

0.12

0.36

0.76

1.51

50% Sugar solution

0.10

0.28

0.56

1.05

1Reported as percent weight change of immersed 1" x 3" x 1/8" samples at 25 °C.

2Moderate swelling and slight softening.

3Moderate swelling and softening.


 

Table 3/ The effect of modifier addition on the properties of EPON Resin 828 /EPIKURE Curing Agent 3370 systems

 

Composition

Units

A

B

C

D

E

EPON Resin 828

pbw

100

100

100

100

100

Nonylphenol

pbw

20

Benzyl alcohol

pbw

20

Dibutyl phthalate

pbw

20

Piccoclastic A-51

pbw

20

EPIKURE Curing Agent 3370

pbw

42

42

42

42

42

 

 

 

 

 

 

 

Handling Properties @ 25°C

 

 

 

 

 

 

Viscosity, System

cP

165

90

90

310

1,000

Gel Time, 100 gram mass

min

24

24

45

44

18

 

 

 

 

 

 

 

Cured State Properties 2

 

 

 

 

 

 

Heat Deflection Temperature

°C

54

28

47

52

50

Tensile Strength

psi

10,500

2,850

5,700

10,250

9,050

Tensile Elongation at break

%

2.4

44.0

28.5

3.4

5.7

Tensile Modulus

ksi

550

130

290

510

450

             

Izod impact, notch

ft.•lb./in.

0.47

1.23

0.46

0.4

0.45

Hardness

Shore D

90

80

86

89

89

 

 

 

 

 

 

 

Chemical Resistance3

 

 

 

 

 

 

Water, distilled

%

0.18

0.39

0.39

0.12

0.09

5% Acetic Acid

%

0.27

0.72

0.72

0.20

0.30

Xylene

%

0.06

0.47

0.47

0.53

1.32

1Supplied by Hercules, Inc.

2All systems were cured for 7 days at 25 °C.

3Percent weight gain after immersion for 24 hours at 25 °C.

 

 

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.

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