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Technical Data Sheet

 

Re-issued September 2005

 

 

EPIKURE™ Curing Agent 3072

 

 

Product Description

EPIKURE™ Curing Agent 3072 is an accelerated amidoamine similar in class to EPIKURE Curing Agent 3070. Compositions based on EPON™ Resin 828 and EPIKURE 3072 cure well in the presence of moisture and form a strong bond to damp concrete as well as other structural materials. The good profile of mechanical and chemical properties makes this curing agent a candidate for a wide variety of end uses.

 

Application Areas/Suggested Uses

  • Concrete floor toppings
  • Grouts
  • Adhesives for bonding old concrete to freshly poured concrete
  • Metal adhesives

 

Benefits

  • Cures well in the presence of moisture
  • Forms excellent bonds to concrete
  • Good profile of mechanical and chemical properties

 

Sales Specification

Property

Units

Value

Test Method/Standard

Amine value

g/eq

517 – 569

ASTM D2896

Viscosity at 25°C

cP

500 - 900

ASTM D2196

Color

Gardner

<12

ASTM D1544

 

 

 

 

 

Typical Properties

Property

Units

Value

Test Method/Standard

Equivalent weight, approx.

 

65

 

Pounds/gallon @ 25 °C

lbs/gal

8.15

ASTM D1475

 

 

 

 

 

 

General Information

EPIKURE Curing Agent 3072 is a moderately reactive room temperature curing agent. The pot life of epoxy compositions based on EPIKURE 3072 depends on the resin, batch size, amount and type of filler loading, and application temperature.

 

EPIKURE Curing Agent 3072 is normally used at a ratio of 35 parts per 100 parts of EPON Resin 828. In thin sections where exothermic heat is readily dissipated, handling strength is reached in 8 to 12 hours at normal room temperature. Full strength is reached after several days.

 

While thin sections can be cured rapidly at moderately elevated temperatures, thicker sections should be allowed to gel at room temperature before additional curing at elevated temperatures. Maximum high temperature properties are obtained with a post cure of 1 to 2 hours at 100 °C.

 

Sand-filled floor topping compositions based on the resin/curing agent mixtures listed in Table 1 containing 600 to 800 parts of sand per 100 parts of resin, have a working life of 1 to 2 hours at 25 °C.

 

For applications requiring low viscosity, EPIKURE Curing Agent 3072 can be used with epoxy resins containing reactive diluents. However, when maximum adhesion to damp substrates is critical, only EPON Resin 828 should be used. Epoxy resin compositions cured with EPIKURE Curing Agent 3072 are rigid, high strength products having properties intermediate to those obtained with the aliphatic polyamines and the modified amidoamines. Some of the properties of room temperature cured systems will be improved with a post cure of 1 to 2 hours at 100 °C. A comparison of the properties of different systems is presented in Table 1. The effect of a post cure at 100 °C is shown for the composition based on EPON Resin 828.

 

Performance Properties

 

Table 1 / Epoxy Systems Cured with EPIKURE Curing Agent 3072

 

 

Method

Units

A

B

C

D

E

EPON™ Resin 828

 

pbw

100

---

100

---

---

EPON Resin 8131

 

pbw

---

100

---

---

---

EPON Resin 815

 

pbw

---

---

---

100

---

EPON Resin 813

 

pbw

---

---

---

---

100

EPIKURE Curing Agent 3072

 

pbw

35

26

35

35

35

 

 

 

 

 

 

 

 

Handling Properties @ 25°C

 

 

 

 

 

 

 

Initial Viscosity

 

cP

4,000

1,200

4,000

800

700

Pot Life, 100 gram mass

 

min.

40

67

40

50

45

Max. Peak Exotherm, 100g mass

 

°C

157

202

157

174

157

 

 

°F

315

396

315

345

315

 

 

 

 

 

 

 

 

Cured State Properties 1

 

 

 

 

 

 

 

HDT

ASTM D648

°C

59

---

89

59

59

Tensile strength

ASTM D638

psi

8,900

2,400

10,200

8,600

8,900

Tensile elongation at break

 

%

2.5

2.5

6.0

6.5

4.5

Flexural strength

ASTM D790

psi

16,000

3,100

17,000

13,600

15,500

Initial flexural modulus

 

ksi

520

70

440

410

450

Compressive yield strength

 

psi

13,200

2,100

13,000

12,200

13,000

Izod impact, notched

ASTM D256

ft.•lb./in.

0.45

0.95

0.47

0.49

0.38

Hardness

Shore D

 

88

71

88

84

85

Water absortion 2

 

%

0.10

0.66

0.14

0.18

0.17

 

 

 

 

 

 

 

 

Electrical Properties

 

 

 

 

 

 

 

Dielectric constant 3

ASTM D150

 

3.97

4.12

3.89

---

3.68

Dissipation factor 3

 

 

0.021

0.033

0.021

---

0.013

Volume resistivity

 

 

 

 

 

 

 

at 25 °C

 

ohm•cm

1.0(1015)

1.5(1013)

1.59(1015)

---

1.7(1015)

at 66 °C

 

ohm•cm

9.9(1012)

5.2(109)

2.72(1014)

---

2.5(1011)

at 93 °C

 

ohm•cm

2.3(1011)

<109

1.54(1012)

---

<109

at 130 °C

 

ohm•cm

<109

---

4.0(109)

---

---

 

 

 

 

 

 

 

 

1 Determined on 1/8” thick test specimens. Systems A and B were cured for 2 weeks at 25 °C. Systems C, D, and E were cured for 16 hours at 25 °C followed by 2 hours at 100 °C.

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

3 Determined at 106 Hertz and 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.

 

This curing agent product may crystallize after extended storage times. It can be reconstituted by gentle warming of the entire container and its contents to approximately 80°C (176°F) until all visual evidence of crystallization has gone away. Upon cooling to normal ambient temperature conditions the product will regain its original liquid state physical properties.

 

EPIKURE Curing Agent 3072 should be stored in tightly sealed containers, in a dry location at normal room temperature. Care should be taken to avoid storage environments resulting in moisture contamination. Exposure to moisture causes an increase in viscosity and reactivity, the degree of increase depending on the amount of moisture which has been absorbed.

 

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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