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�Toughened Epoxy Systems

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DR / DH Series Resins and Hardener

DR/DH series epoxy resins offer a wide range of physical and mechanical properties.� These resins are all categorized as two phase systems where elastomeric particles form within the resin during the cure to enhance the toughness and cohesion properties.� DR/DH resins are designed to optimize resin toughness while maintaining high stiffness and adhesion properties.�� The DR/DH resin systems work well on all fiberglass, carbon, and Kevlar reinforcements.� The different resins and hardeners can be matched in any way to yield desired cure characteristics and properties.� See Table I for suggestions and appropriate mix ratios.�

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Resins (DR)

� DR-5 is a low viscosity (2000 cps) resin intended for hand laminating, filament winding, RTM and VARTM processes.�

� DR-7 medium viscosity (3000 cps) resins for wet impregnation equipment and applications where higher viscosity

�� is beneficial to improve handling.� DR-11 has higher stiffness and is optimized for applications under high compression loads.

� DR-AD is a tough adhesive for maximum peel strength and creep resistance.� Adhesive works well in bonding metal and

� �composite structures.

� DR-ADTX is same as DR-AD but with additional thixotropic bondline control.� Excellent adhesive for manufacturing

� honeycomb and other cored structures where low sag is needed.

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Data Sheets: DR-5 / DR-7 /

DR-ADTX / DH_AD

Hardeners

� EH-101 is the fastest cure hardener (15 min. pot life) and is excellent for joining and fairing.� Cures well at low temperatures.

� EH-102 is designed for laminating moderately large components which need very good overnight room temperature cure and

�� 2-3 hours working time.� Parts can be de-molded after 12 hours at 77 F without the typical epoxy brittle phase.

� EH-103 is a long potlife (200 min) hardener which sets overnight, but requires 120 F post cure to eliminate brittle phase in

�� cure.� Excellent hardener for large boating projects which may require 8 hours of working time

� EH-104 is the slowest hardener and has low skin irritation and is recommended for individuals whom are sensitive to epoxy

�� resin hardeners, and large projects that require up to 12 hours of working time.� Parts will set hard after 48 hours, but require

��additional heat at 160 F for 4 hours to complete the cure.� Hardener is not recommended for cures below 160 F.

� DH-AD converter is formulated to promote adhesion without the loss of modulus or creep resistance.�� DH-AD also

� maximizes bonding to polyester and vinyl ester resins and gel coats when used as a boundary ply.� For best adhesion results,

� a light sanding and solvent wipe is recommended.

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Data Sheets: EH-101 / EH-102 / EH-103

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Property Summary and Application Guide for the DR - Toughened Epoxy Systems

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Physical and Mechanical Properties:

Table I.

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Viscosity (cps)

A / B / Mixed

Mix Ratio

Vol����� Wt

Pot Life

150 gr @

�25 C

HDT

(deg. C)

Peel Strength *

(lb/in)

Flex. Modulus

(msi)

Applications

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DR-5/EH-101

2000/300/1200

4:1

100:22

15 min

83

25

.46

Fairing, bonding, and joining of parts which require short working time. Excellent bonding to metallic surfaces.

DR-5/EH-102

2000/200/1000

4:1

100:22

87 min

81

19

.44

Hand lamination jobs requiring 3 hrs working time.� Excellent overnight cure.

DR-5/EH-103

2000/100/1000

4:1

100:22

180 min

92

18

.48

Hand lamination jobs requiring 8 hrs working time and low temperature cure

DR-5/EH-104

2000/300/1400

4:1

100:22

8 hrs

88

18

.48

Large parts requiring long working time. Fast cure pultrusions (1-5 minutes @ 250-300 F).� Low skin sensitivity. Parts require

160 F post cure.

DR-7/EH-101

3000/300/2000

4:1

100:22

13 min

92

24

.48

Same as DR-5/EH-101 but to be used with wet impregnation equipment.� Gives optimum balance of� peel strength and modulus.� Excellent for manufacturing skis and snowboards.

DR-7/EH-102

3000/200/1800

4:1

100:22

60 min

100

19

.52

Same as DR-5/EH-102 but with a slightly higher viscosity and increase in stiffness.Excellent for products under high compression loads.

DR-AD/DH-AD

15,000/

11,000/12,000

2:1

100:44

85 min

85

25

.45

Excellent for secondary bonding to

composites and metallics.� At least one surface should be textured for bondline control.� Otherwise use DR-ADTX adhesive.

DR-ADTX

/DH-AD

Paste / Gel

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100:44

85 min

85

28

.46

Honeycomb sandwich panels, and bonding� jobs requiring low sag.
  • 90o�Peel Strength is a direct correlation with� resin toughness and adhesion, and is a measurement of the composites resistance to premature delamination.�

  • Test done using 3 plies 7781 glass reinforced laminate co-cured to lightly sanded and solvent wiped aluminum sheet.

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Epoxy pricing

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Pricing per pound for DR epoxy resins

Product Drum (480 lbs) - $ per lb 5 Gal Pail (42 lbs) - $ per lb 1 Gal Ctnr (8-10 lbs) - $ per lb
DR-5 4.00 5.00 6.20
DR-7 3.70 4.40 5.40
DR-ADTX 4.20 (400 lbs) 5.10 (35 lbs) 6.10 ( 7 lbs)

Pricing per pound for hardeners

Product 15 Gal Ctnr (110 lbs) - $ per lb 5 Gal (20 lbs) / 1 Gal (8-10 lbs) 1 Qt Ctnr (2 lbs) - $ per lb
EH-101 3.95 4.70 / 5.70 6.95
EH-102 4.40 5.45 / 6.45 7.55
EH-103 4.85 5.95 / 7.20 8.80
EH-104 4.85 5.95 / 7.20 8.80
DH-AD 3.95 (176 lbs) 5.95 (16 lbs) 5.95 (3.1 lbs)

������������������������������������������������������� July 2005. Prices subject to change with out notice.

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