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HexFlow® VRM37

176°C Curing, Two-Part, Mid-Toughened Epoxy Resin

Product Data


HexFlow® VRM37 is a 176°C curing, two-part, mid-toughened epoxy resin, specifically developed to meet the demanding requirements of structural aerospace resin transfer moulding (RTM) and vacuum assisted resin transfer moulding (VARTM) applications. This epoxy system supports service temperatures from -60°C up to 176°C. At room temperature, HexFlow® VRM37 Part A is a light amber colour; HexFlow® VRM37 Part B is a dark purple colour.


I Two-part system I Mix ratio by Weight: 100A:60B I Toughened (GIC=402.8 J/m )


I Low moisture uptake I Short, simple cure cycle I Superior aerospace performance I Microcrack resistant

I High glass transition temperature (184°C) I Excellent hot/wet properties I Easy to process I Long injection window (120 minutes at 54°C)


Shelf Life 12 months at the recommended storage Recommended Storage Store HexFlow® VRM37 Part A in a sealed moisture proof container at 4°C or below; Store HexFlow® VRM37 Part B at RT in a sealed moisture proof container. Recommended Disposal Procedure See MSDS for disposal instructions. Disposal of this material shall be in accordance with all local, state and federal regulations.


HexFlow® VRM37 is available with a wide range of Injectex, HexForce®, 0/90 and multi-axial (carbon, glass, aramid and hybrid) fabrics. Please refer to our website for additional information on our Reinforcements product line

© Copyright Hexcel Corporation ® HexFlow, HexForce, Hexcel and the Hexcel logos are registered trademarks of Hexcel Corporation, Stamford, Connecticut USA.

HexFlow® VRM37 Product Data

Gel Time

Temperature (°C)

204 1000 190 176 162 148 135 121 107

Gel Time (min)



1 0.0021 0.0022 0.0022 0.0023 0.0024 0.0025 0.0025 0.0026

1/T (1/K)

Viscosity Profiles

Dynamic Viscosity Curve




100000 Viscosity (mPa·s)





1 10 37 65 93 Temperature (°C) 121 148 176

176°C Curing, Two-Part, Mid-Toughened Epoxy Resin

Neat Resin Properties

Property Cured Density (g/cc) MEK Uptake after 14 days (%) CTE (mm/mm-°C) Condition RTA RTA -70 to 50°C 45 to 150°C Flexural Strength (MPa) Flexural Modulus (MPa) KIC (MPa m) RTA RTA RTA Value 1.15 0.5 49E


Test Method Displacement neat resin casting TMA TMA ASTM D790, Method 1 ASTM D790, Method 1 ASTM D5045

63E 21


3,530 0.7822

Recommended Cure Cycle

I Ramp 1.2-2.4°C/min to 100°C, dwell 1 hour I Ramp 1.2-2.4°C/min to 176°C, hold 3 hours I Cool 3°C/min



Hold 3 hours

Temperature (°C)


1.2-2.4°C/min Dwell 1 Hour


Cool-down 3°C/min




26 0 50 100 150 200 250 300 350 400

Time (minutes)

Composite Laminate Physical Properties

Property Glass Transition Temperature (°C) Condition Dry Wet-71°C water, 14 days Value 183 152 Test Method DMTA DMTA



Moisture Uptake (%)





-0.2 0 2 4 6 8 10 12 14 16

Time (days) (14 Days in Water/71°C)

176°C Curing, Two-Part, Mid-Toughened Epoxy Resin

Composite Laminate Mechanical Properties

Standard Modulus Carbon 3K 195 GSM PW Property Compression Strength (MPa) Condition Dry 82°C, Wet Unnotched Compression Strength (MPa) Dry 71°C, Wet Open Hole Compression Strength (MPa) Dry 82°C, Wet Short Beam Shear (MPa) Flexural Strength (3-Point, MPa) Flexural Modulus (3-Point, GPa) Fracture Toughness GIC (J/m )


Value* 821.2 608.8** 426.8 374.4** 262 226.1** 74.5 826 52 402.8

Dry Dry Dry Dry

*All Data has been normalized to 8.9 mil CPT except GIC **Conditioning: 14 days at 71°C

HexFlow® VRM37 Product Data


Hexcel Corporation believes, in good faith, that the technical data and other information provided herein is materially accurate as of the date this document is prepared. Hexcel reserves the right to modify such information at any time. The performance values in this data sheet are considered representative but do not and should not constitute specification minima. The only obligations of Hexcel, including warranties, if any, will be set forth in a contract signed by Hexcel or in Hexcel's then current standard Terms and Conditions of Sale as set forth on the back of Hexcel's Order Acknowledgement.

For more information

Hexcel is a leading worldwide supplier of composite materials to aerospace and other demanding industries. Our comprehensive product range includes: I Structural Film Adhesives I Carbon Fibre I Honeycomb Sandwich Panels I RTM Materials I Special Process Honeycombs I Honeycomb Cores I Reinforced Fabrics I Continuous Fibre Reinforced Thermoplastics I Carbon, Glass, Aramid and Hybrid Prepregs For worldwide sales office telephone numbers and a full address list please click here:

August 2007



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