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Technical Data Sheet


Issued: November 2016


EPIKOTE™ Resin MGS™ RIMR 935 and

EPIKURE™ Curing Agent MGS™ RIMH 936/937







Applications that require high heat resistances – boat and shipbuilding, automotive, tooling and moulding

Operational Temperature

-60 °C up to +120 °C (-76 °F up to +248 °F) after suitable heat treatment



At temperatures between 15 °C and 50 °C (59 °F-122 °F), preferably 25 °C - 35 °C (77 °F - 95 °F), infusion, hand lay-up and others


Very high heat resistance, low mixed viscosity, good mechanical properties, pot life approx. 2-5 h, short curing times at elevated temperatures


Shelf life of 24 months in originally sealed containers




Low viscous infusion resin system for processing of woven and non-crimp multiaxial fabrics of low to high areal weight. Due to its very good mechanical properties, this system is suitable for the production of components featuring high static and dynamic loadability and high heat resistance.


Infusion resin RIMR 935 is based on bisphenol A/F resin. Hardener RIM H 936 and RIM H 937 are a modification of aliphatic and cycloaliphatic amines. Pot life (100 g mixed at 30 °C/86 °F) is approximately 2 hours for RIMH 936 and 3,5 h for RIMH 937. Optimum viscosities for infusion are realized at temperatures in the range of 25 - 35 °C (77 ° - 95 °F). Pot life is then between approx. 1 h (RIMH 936 at 40 °C/104 °F) to 5 h (RIMH 937 at 25 °C/77 °F). Following initial curing at room temperature, the parts are still brittle and require heat treatment at a min. temperature of 50 °C/122 °F before processing or demoulding. Direct curing at elevated temperatures (60 °C-100 °C/140 °F-212 °F) is possible. The curing time can be reduced to a few minutes by this.

Non-tacky, high-gloss surfaces are obtained even with unfavourable curing conditions, such as low temperatures or high relative humidity.


The infusion resin system does not contain any unreactive components. All raw materials and additives feature a very low vapor pressure, therefore permitting processing of the material under vacuum even at elevated temperatures. Compatibility problems are not to be expected in combination with suitable gelcoats, various paints (e.g., PUR-based), etc., however comprehensive tests are indispensable.


These products can be stored for at least 24 months in their carefully sealed original containers. Even though it is unlikely, these products may crystallise at temperatures below +15 °C. The crystallisation is visible as a clouding or solidification of the contents of the container. If crystallisation of either component should be observed, it can removed by warming up. Slow warming up to approx. 50 °C-60 °C (122 °F-140 °F) in a water bath or oven and stirring or shaking will clarify the contents of the container without any loss of quality. Use only completely transparent products. Before warming up, open containers slightly to permit equalization of pressure. Caution during warm-up! Do not warm up over an open flame! While stirring up, use safety equipment (gloves, eyeglasses, respirator equipment).


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





Resin RIMR 935




1,14 - 1,20




400 - 800

Epoxy equivalent



155 - 165

Epoxy value



0,61 - 0,64

Refractory index

1,5350 - 1,5450




Hardener RIMH 936

Hardener RIMH 937



0,92 - 0,97

0,92 - 0,96



10 - 50

30 - 100

Amine Value

[mg KOH/g]

550 - 650

450 - 500

Refractory index

1,4850 - 1,4920

1,4920 - 1,5020



Measuring conditions: measured at 25 °C / 77 °F




Resin RIMR 935

Hardener RIMH 936

Hardener RIMH 937

Average EP - Value




Average amine equivalent









RIMR 935 : RIMH 936

RIMR 935 : RIMH 937

Parts by weight

100 : 29 ± 2

100 : 38 ± 2

Parts by volume

100 : 35 ± 2

100 : 45 ± 2



The specified mixing ratios must be observed as exactly as possible. Adding more or less hardener will not result in a faster or slower reaction, but in incomplete curing, which cannot be corrected in any way. Resin and hardener must be mixed very thoroughly. Mix until no clouding is visible in the mixing container. Pay special attention to the walls and the bottom of the mixing container.





Viscosity Development MGS RIMR 935





 Temperature Development



The optimal processing temperature is in the range between 20 and 25°C (68 - 77°F). Higher processing temperatures are possible, but will shorten pot life. A rise in temperature of 10 °C (18°F) will halve the pot life. Water (for example very high humidity or contained in fillers) causes an acceleration of the resin/hardener reaction. Different temperatures and humidities during processing have no significant effect on the strength of the cured product.





 RIM 935-Viscosity of Mixture





Max. TG at 80 °C (176 °F) post cure

90 - 100 °C (194 - 212 °F)

Max. TG at 100 °C (212 °F) post cure

105 - 120 °C (221- 248 °F)

Max. TG at 140 °C (284 °F) post cure

135 - 150 °C (275 - 302 °F)





 RIM 935-DMA



® 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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