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Technical Data Sheet




EPIKURE™ Curing Agent MGS™ RIMH233, RIMH235 - 237





DNV-GL Germanischer Lloyd (RIMH235 – RIMH237)


Rotor blades for wind turbines, boat and shipbuilding, sports equipment, model construction, tooling and moulding


-60 °C up to +50 °C without heat treatment

-60 °C up to +80 °C after heat treatment


at temperatures between 15 °C and 50 °C


very low viscosity

pot life from approx. 10 minutes to approx. 4,5h


shelf life of 24 months in originally sealed containers




RIMR235 is a low-viscous infusion resin system with different pot lives for processing of glass, carbon and aramide fibers. Due to its excellent mechanical properties, this system is suitable for the production of components featuring high static and dynamic loadability.

The range of pot lives is between approx. 10min and more than 4h depending on the choice of curing agent.

RIMR235 features an extraordinary low mixed visosity, resulting in fast and complete fibre wetting at a high transportation rate in infusion processes. The infusion resin system does not contain any unreactive components. The raw materials used feature a very low vapour pressure which permits processing of the material under vacuum even at elevated temperatures.


Optimum processing temperatures are in the range of 15 - 40°C. As the initial cure at room temperature is very slow as for the low reactive hardeners, some heat treatment should be performed at minimum 40 - 50 °C before demoulding.

Curing at higher temperatures (up to approx. 80 - 100°C) is possible, depending on layer thickness, geometry of the parts and choice of curing agent.

Full mechanical properties will only be obtained after a suitable post cure cycle. Especially for operations at elevated temperatures such a post cure cycle is required to obtain the required thermal stability. For optimum mechanical properties a heat treatment of minimum 50°C is required.


The infusion resin system RIMR235 remains practically free of crystallisation, even if it is stored at low temperatures (<15 °C). In an early stage, crystallisation is visible as a clouding, and can progress to a stage, where the resin becomes a wax- like solid. Crystallisation can be reversed by slow heating of the product to approx. 40 - 60 °C while stirring. This physical phenomenon is reversible and is no restriction to quality after removal, in fact a high purity of material will increase a tendency for crystallisation.


After dispensing material, the containers must again be closed carefully, to avoid contamination or absorption of water. All amine curing agents show a chemical reaction when exposed to air, known as „blushing“. This reaction is visible as white carbamide crystals, which could make the materials unusable.


Curing agents can be coloured to distinguish between resin and curing agents, and for easier identification of a correct mixing process. Although unlikely, deviations in colour are possible (e.g. due to UV radiation after longer exposure to sun light), but however have no effect on the processing and final properties of the material


The materials have a shelf life of minimum 2 years, when stored in their originally sealed containers.


The relevant industrial safety regulations for the handling of epoxy resins and hardeners for safe processing are to be observed.







Infusion resin RIMR235

Density 1)


1,14 – 1,18

Viscosity 1)


1.000 – 1.300

Refractory index 1)


1,550 – 1,560




Curing agents without GL-Approval




Density 1)


0,96 – 1,00

Viscosity 1)


50 – 100

Refractory index 1)


1,505 – 1,515

Potlife 2)


Approx. 10 min

Tg mid,pot


90 – 95°C unconditioned




Curing agents with GL-Approval






Density 1)


0,92 – 0,96

0,93 – 0,96

0,92 – 0,96

Viscosity 1)


10 – 30

10 – 30

10 – 30

Refractory index 1)


1,465 – 1,469

1,460 – 1,469

1,457 – 1,460

Potlife 2)


Approx. 80 min.

Approx. 3h

Approx. 4,5h

Tg mid,pot


90 – 95°C unconditioned

 Measuring conditions:  
1) measured at 25°C
2) measured at 30°C






RIMR235 : All curing agents

Parts by weight

100 : 34 ± 2

Parts by volume

100 : 41 ± 2


The mixing ratio stated must be observed very carefully. Adding more or less curing agent will not influence reaction speed – but in incomplete curing which cannot be corrected in any way. Resin and curing agent must be mixed very thoroughly, mix until no clouding is visible in the mixing container.



EPIKOTE Resin MGS RIMR 235 and EPIKURE Curing Agent RIMH 235-238_temperature development 


Measuring conditions: 100g mixture in a water bath at 30°C


Optimum processing temperature is in the range of 20 to 35 °C. Higher temperatures are possible, but will shorten pot life. A temperature increase of 10 °C will halve the pot life. Water (e.g. high humidity or contained in additional fillers) causes an acceleration of the resin/curing agent reaction. Different temperatures during processing are not known to have significant impact on the mechanical properties of the cured product.
Do not mix large quantities – particularly of highly reactive systems – at elevated processing temperatures. As the heat dissipation in the mixing container is very slow, the contents will be heated up by the reaction heat rapidly. This can result in temperatures of more than 200 °C in the mixing container, which may cause smoke-intensive burning of the resin mass.




 EPIKOTE Resin MGS RIMR 235 and EPIKURE Curing Agent RIMH 235-238_viscosity of mixture


 Measuring conditions: Rotation viscosimeter, plate-plate configuration, measuring gap 0.2 mm



EPIKOTE Resin MGS RIMR 235 and EPIKURE Curing Agent RIMH 235-238_viscosity development 

 Measuring conditions: Rotation viscosimeter, plate-plate configuration, measuring gap 0.2 mm, Temperature 40°C





EPIKOTE Resin MGS RIMR 235 and EPIKURE Curing Agent RIMH 235-238_Tg1


EPIKOTE Resin MGS RIMR 235 and EPIKURE Curing Agent RIMH 235-238_Tg2


EPIKOTE Resin MGS RIMR 235 and EPIKURE Curing Agent RIMH 235-238_Tg3


EPIKOTE Resin MGS RIMR 235 and EPIKURE Curing Agent RIMH 235-238_Tg4


EPIKOTE Resin MGS RIMR 235 and EPIKURE Curing Agent RIMH 235-238_Tg5


EPIKOTE Resin MGS RIMR 235 and EPIKURE Curing Agent RIMH 235-238_Tg6





Mechanical data, typical for curing of 10hrs at 70°C


DIN EN ISO 1183-1


1,12 – 1,18

Flexural strength



95 – 115

Tensile modulus

DIN EN ISO 527-2


3,0 – 3,2

Tensile strength

DIN EN ISO 527-2


65 – 70

Elongation at break

DIN EN ISO 527-2


6 – 8

Water absorption at 23°C


24h [%]
 7d [%]

0,10 – 0,30
0,40 – 0,60


Mechanical data are typical for the combination of infusion resin RIMR235 with curing agent RIMH237. Data can differ in other applications.


® and ™ Licensed trademarks of Hexion Inc.


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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