DER 331

Product Information

D.E.R.™ 331™ Liquid Epoxy Resin

D.E.R.™ 331™ Liquid Epoxy Resin is a liquid reaction product of epichlorohydrin and bisphenol-A.

Description

D.E.R. 331 Epoxy Resin is the most widely used general purpose liquid epoxy resin. It is recognized as the standard from which many variations have been developed. A wide variety of curing agents is available to cure liquid epoxy resins at ambient conditions. The most frequently used are aliphatic polyamines, polyamides, amidoamines, cycloaliphatic amines and modified versions of these curing agents. Curing may also be done at an elevated temperature to improve selected properties such as chemical resistance and glass transition temperature. If anhydride or catalytic curing agents are employed, elevated temperature cures are necessary and long post-cures are required to develop full end properties. This product is suitable for use in applications such as: •     Adhesives •     Casting and Tooling •     Civil Engineering •     Composites •     Automotive Coatings •     Can and Coil Coatings •      Marine and Protective Coatings •     Photocure Industrial Coatings •     Potting and Encapsulation

Introduction

Typical Applications

Property1) Value Method Epoxide Equivalent Weight (g/eq) 182 – 192 ASTM D-1652 Epoxide Percentage (%) 22.4 – 23.6 ASTM D-1652 Epoxide Group Content (mmol/kg) 5200 – 5500 ASTM D-1652 Color (Platinum Cobalt) 75 Max. ASTM D-1209 Viscosity @ 25°C (mPa^s) 11000 – 14000 ASTM D-445 Hydrolyzable Chloride Content (ppm) 500 Max. ASTM D-1726 Water Content (ppm) 700 Max. ASTM E-203 Density @ 25°C (g/ml) 1.16 ASTM D-4052 Flash Point (°C) 252 ASTM D-93 Epichlorohydrin Content (ppm) 5 Max. DowM 101321 Shelf Life (Months) 24 (1) Typical properties, not to be construed as specifications.

Typical Properties

The Dow Chemical Company provides its customers with a product specific Material Safety Data Sheet (MSDS) or Safety Data Sheet (SDS) to cover potential health effects, safe handling, storage, use and disposal information. Dow strongly encourages its customers to review the MSDS or SDS on its products and other materials prior to their use.

This liquid epoxy resin is supplied in bulk or in 220 kg tight-head drums. The resin should be stored in a dry place in its original closed packaging. This low viscosity epoxy resin should retain its chemical properties for a period of at least 24 months.

For further handling information consult the Dow brochure entitled, DOW Epoxy Resins Product Stewardship Manual, Safe Handling and Storage, Form No. 296-00312 and the technical bulletin, Product Coding, Shelf-life and Storage Stability, Form No. 296-01657.

Notice: D.E.R.™ 331™ Liquid Epoxy Resin can crystallize. This reversible, physical phenomena can be greatly avoided by storing the resin at temperatures not below 25°C. For additional information, consult the technical bulletin, Crystallization of Liquid Epoxy Resins, Form No. 296-01652.

Viscosity: D.E.R. 331 Liquid Epoxy Resin

Temperature (oC)

Reactivity and

Structural

Properties

	Chemical Resistance
	Thermal Resistance
				Formulation A Parts By Weight B Parts By Weight C Parts By Weight D.E.R. 331 Epoxy Resin 100 100 100 D.E.H. 24 Epoxy Curing Agent 13 1,2-Dicyclohexane Diamine 17 Polyamide 43 Thermal Degradation @ 160°C (wt% loss) 100 hours 0.71 1.4 0.73 200 hours 1.0 1.6 1.1 300 hours 1.4 1.9 1.4 500 hours 1.6 2.0 1.6 Thermal Degradation @ 210°C (wt% loss) 100 hours 3.4 3.8 2.9 200 hours 5.4 5.6 4.2 300 hours 6.8 7.3 5.0 500 hours 7.8 9.9 5.6

Safety and Handling

The Dow Chemical Company provides its customers with a product specific Material Safety Data Sheet (MSDS) or Safety Data Sheet (SDS) to cover potential health effects, safe handling, storage, use and disposal information. Dow strongly encourages its customers to review the MSDS or SDS on its products and other materials prior to their use.

This liquid epoxy resin is supplied in bulk or in 220 kg tight-head drums. The resin should be stored in a dry place in its original closed packaging. This low viscosity epoxy resin should retain its chemical properties for a period of at least 24 months.

For further handling information consult the Dow brochure entitled, DOW Epoxy Resins Product Stewardship Manual, Safe Handling and Storage, Form No. 296-00312 and the technical bulletin, Product Coding, Shelf-life and Storage Stability, Form No. 296-01657.

Notice: D.E.R.™ 331™ Liquid Epoxy Resin can crystallize. This reversible, physical phenomena can be greatly avoided by storing the resin at temperatures not below 25°C. For additional information, consult the technical bulletin, Crystallization of Liquid Epoxy Resins, Form No. 296-01652.

 

Reactivity and

Structural

Properties

Typical Properties As Formulated

Formulation	A	B	C
	Parts By Weight	Parts By Weight	Parts By Weight
D.E.R. 331 Epoxy Resin	100	100	100
D.E.H.™ 24 Epoxy Curing Agent	13
1,2-Dicyclohexane Diamine		17
Polyamide			43
Mix-viscosity @ 25°C (mPa^s)	2250	1020	16000
Properties
Gel Time (min) 500 gram	25	50	56
Temperature at Gel Point (°C)	74	113	94
Maximum Exotherm (°C)	266	172	118
Time to Maximum Exotherm (min)	36	56	110
Heat Deflection Temperature (°C)	111	110	101
Flexural Strength (N/mm2)	96	106	67
Flexural Modulus (kN/mm2)	3.0	2.9	2.4
Yield Compressive Strength (N/mm2)	112	110	85
Tensile Strength (N/mm2)	79	71	57
Elongation at Break (%)	4.4	4.0	3.9

 

	Chemical Resistance
	Thermal Resistance
				Formulation A Parts By Weight B Parts By Weight C Parts By Weight D.E.R. 331 Epoxy Resin 100 100 100 D.E.H. 24 Epoxy Curing Agent 13 1,2-Dicyclohexane Diamine 17 Polyamide 43 Thermal Degradation @ 160°C (wt% loss) 100 hours 0.71 1.4 0.73 200 hours 1.0 1.6 1.1 300 hours 1.4 1.9 1.4 500 hours 1.6 2.0 1.6 Thermal Degradation @ 210°C (wt% loss) 100 hours 3.4 3.8 2.9 200 hours 5.4 5.6 4.2 300 hours 6.8 7.3 5.0 500 hours 7.8 9.9 5.6