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Technical Data Sheet

 

Issued: November 2016

 

EPIKOTE™ Resin MGS™ RIMR 935 and

EPIKURE™ Curing Agent MGS™ RIMH 936/937

 

CHARACTERISTICS

 

Approval

-

Application

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

 

Processing

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

Features

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

Storage

Shelf life of 24 months in originally sealed containers

 

 

APPLICATION

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.

 


SPECIFICATIONS

 

 

Resin RIMR 935

Density

 

[g/cm³]

1,14 - 1,20

Viscosity

 

[mPas]

400 - 800

Epoxy equivalent

 

[g/equivalent]

155 - 165

Epoxy value

 

[equivalent/100g]

0,61 - 0,64

Refractory index

1,5350 - 1,5450

 

 

 

Hardener RIMH 936

Hardener RIMH 937

Density

[g/cm³]

0,92 - 0,97

0,92 - 0,96

Viscosity

[mPas]

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


PROCESSING DETAILS

 

 

Resin RIMR 935

Hardener RIMH 936

Hardener RIMH 937

Average EP - Value

0,63

-

-

Average amine equivalent

-

45

59

 

 


MIXING RATIOS

 

 

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

 

 

Viscosity Development MGS RIMR 935

 


TEMPERATURE DEVELOPMENT

 

 

 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.

 


VISCOSITY OF MIXTURE

 

 

 RIM 935-Viscosity of Mixture

 

 

GLASS TRANSITION TEMPERATURE (TG) UNCONDITIONED

 

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)

 


DMA

 

 

 RIM 935-DMA

 

 

® and ™ Licensed trademarks of Hexion Inc.

DISCLAIMER

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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