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Technical Data Sheet

 

Re-issued August 2001

 

 

EPIKURE™ Curing Agent 3270

 

 

Product Description

EPIKURE™ Curing Agent 3270, a modified aliphatic amine, is designed to rapidly cure thin sections of epoxy resin formulations at temperatures of 60 °F (15 °C) and above. EPIKURE 3270 is of special interest for decorative flooring and high-build coating applications because 100 percent reactive formulations of this type cure rapidly to clear, tough, mar-resistant films over a wide ambient temperature and relative humidity range. High-build floor coatings have been applied in one day and opened to traffic after an overnight cure period. Additionally, EPIKURE Curing Agent 3270 is well suited for fast setting equal volume adhesives.

 

Application Areas/Suggested Uses

  • Adhesives
  • Flooring
 

 

Benefits

  • Light color
  • Good mar resistance
  • Resistance to amine carbonate formation (“blush”, “bloom” or “sweat-out”)
  • Convenient combining ratios

 

Sales Specification

Property

Units

Value

Test Method/Standard

Amine as KOH

mg/g

313 – 337

ASTM D2896

Viscosity at 25°C

cP

4,000 – 7,000

ASTM D2196

Color

Gardner

2 max.

ASTM D1544

 

 

 

 

 

Typical Properties

Property

Units

Value

Test Method/Standard

Equivalent weight, approx.

 

142

 

Pounds/gallon @ 25 °C

lbs/gal

8.07

ASTM D1475

Flash Point

°F

>200

Setaflash

 

 

 

 

 

General Information

The useful combining ratio range of EPIKURE Curing Agent 3270 is 60 to 100 parts per 100 parts resin when used with an unmodified liquid epoxy resin such as EPON™ Resin 828. Equal volume proportions are 83 parts per 100 parts resin.

 

The gel time of an EPON 828/EPIKURE 3270 system is approximately 6 minutes for a 100-gram mass at 77 °F (25 °C). Thinner sections permit longer working life; for example, 1/8-inch thick “puddles” may be used to extend application time in decorating and are workable for approximately 25 minutes. For 2-mil thick coatings, tack-free cure is obtained in approximately 2 hours at 25 °C.

 

Aliphatic polyglycidyl ethers such as HELOXY™ Modifiers 32, 67 and 48 are useful flexibilizers and reactive diluents for formulations cured with EPIKURE Curing Agent 3270. These modifiers contribute a better balance of reactivity, strength and toughness than do monoepoxide diluents. Using HELOXY Modifier 48 or other high functionality resins provides maximum reactivity. The large variation in epoxide equivalent weights between EPON 828 and most aliphatic polyglycidyl ethers necessitates an adjustment in combining ratios when these modifiers are incorporated.

 

EPIKURE Curing Agent 3270 is compatible in all proportions with other aliphatic polyamines, including EPIKURE Curing Agents 3295, 3125, 3055, 3046, and 3274. Blending with EPIKURE Curing Agent 3274 achieves intermediate reactivities with no sacrifice in resistance to amine carbonate formation “sweat-out”. The compatibility of EPIKURE 3270 with coal tar and petroleum derived extenders is notably high.

 

Performance Properties

 

Table 1 / Properties of Systems Cured with EPIKURE Curing Agent 3270

 

 

Method

Units

A

B

C

D

EPON™ Resin 828

 

pbw

100

100

90

100

HELOXY™ Modifier 8

 

pbw

---

---

10

---

EPIKURE Curing Agent 3270

 

pbw

75

13

45

75

EPIKURE Curing Agent 3274

 

pbw

---

33

15

---

 

 

 

 

 

 

 

Handling Properties @ 25°C

 

 

 

 

 

 

Viscosity

 

cP

5,800

---

---

5,800

Gel Time

 

 

 

 

 

 

100 gram mass

 

minutes

6

34

15

6

1/8 inch thick

 

minutes

38

---

65

38

Tack-Free Time

 

 

 

 

 

 

0.003-inch thickness at 25 °C

 

hours

2

16-24

5

2

0.003-inch thickness at 10 °C

 

hours

18

---

---

18

Film Clarity

 

 

clear

clear

clear

clear

 

 

 

 

 

 

 

Cure Schedule

 

wk/°C

2/25

2/25

2/25

2/25

 

 

 

 

 

 

 

Cured State Properties 1

 

 

 

 

 

 

Heat Deflection Temperature

ASTM D648

°C

56

64

40

60

Tensile Strength

ASTM D638

psi

8,870

8,300

6,200

7,800

Tensile Elongation at break

 

%

2

1.9

15

2

Compressive Strength, ultimate

 

psi

15,300

---

19,800

13,300

Compressive Strength, Yield

 

psi

---

---

9,500

---

Izod impact, notched

ASTM D256

ft.•lb./in.

0.42

0.44

0.98

0.40

Hardness

 

Shore D

83

82

80

82

 

 

 

 

 

 

 

Chemical Resistance

 

 

 

 

 

 

Water absortion 2

 

%

0.20

0.14

0.27

0.36

 

 

 

 

 

 

 

Electrical Properties

 

 

 

 

 

 

Volume resistivity

 

 

 

 

 

 

at 25 °C

 

ohm•cm

4.1 x 1014

---

---

4.7 x 1014

at 66 °C

 

ohm•cm

2.3 x 1011

---

---

6.0 x 1011

at 93 °C

 

ohm•cm

1.7 x 109

---

---

9.4 x 109

at 130 °C

 

ohm•cm

<109

---

---

<109

 

 

 

 

 

 

 

1 Determined on 1/8” thick test specimens at 25 °C. Systems A through D were cured for 2 weeks at 25 °C.

2 Percent 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.

 

To preserve product quality and prevent discoloration, it is recommended that a nitrogen blanket be maintained on the headspace of an opened container and that storage / handling temperatures in excess of 50°C (122°F) be avoided. Spillage around the opening of the container from dispensing operations will form a crystalline residue. This residue is not soluble in the curing agent nor the resin, and certain measures should be taken to prevent it from contaminating the remaining contents of the container. The crystalline residue should be removed with a warm damp wash cloth PRIOR to re-opening the container for dispensing.

 

EPIKURE Curing Agent 3270 should be stored in tightly sealed, completely filled containers of metal, glass, or polyolefin plastic at normal room temperatures. The curing agent may darken during long-term storage, the extent of color formation depending on storage temperature and exposure to air.

 

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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