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Epikote™ Resin MGS LR235 Epikure Curing Agent MGS LH233-239

Characteristic

Approval DNV-GL (Germansicher Lloyd)
Application Rotor blades for wind turbines, boatbuilding as laminating and adhesive resins (wood-epoxy construction), sporting goods, moulds, tools and other devices
Operational
temperature
-60 °C up to +50 °C without heat treatment
-60 °C up to +80 °C after heat treatment
Processing At temperatures between 15 °C and 50 °C, all common processing methods
Features Pot life from approx. 10 min. up to more than 12 h
Can be used without heat treatment
Physiologically compatible
Storage Shelf life of 24 months in originally sealed containers

 

Application

Laminating resin system approved by the German Lloyd. It contains no solvents and fillers and has a wide range of pot lives. The system is used for processing of glass, carbon and aramide fibres, featuring high static and dynamic loadability. This system has very good adhesion properties on wood and other materials. In boatbuilding, laminating resin LR 235 can be used universally, especially for wood-epoxy constructions.

The range of pot lives is between approx. 10 min. and more than 12 hours at room temperature. This enables a selection of the optimum system for all processing methods. After precuring at room temperature, the manufactured components are workable and demouldable. The final properties, however, will only be reached after postcuring at temperatures of more than 40 °C. At room temperature, the fast hardeners LH 233 - 235 are processable and demouldable after 6 - 12 hours, while the very slow hardeners LH236 and 237 have curing periods of 2 - 4 days at room temperature.

Parts produced with LR 235 result in high-gloss and non-tacky surfaces, even with unfavourable curing conditions, e. g. lower temperatures and/or high humidities. The mixing viscosity guarantees a fast and complete impregnation of the reinforcement fibres, however, the resin will not spill out of the fabrics on vertical surfaces.

Due to the chemical characteristics of this system we do not expect any problems concerning compatibility (e. g. blistering, tearing or changes in colour), when it is processed with gelcoats. However, comprehensive tests are indispensable.

Epoxy resins are super cooled liquids, therefore crystallisation is immanently possible. 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. 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.

Although LR 235 is very unlikely to crystallize at low temperatures, storage conditions of 15-30 °C and low humidity are recommended. After dispensing material, the containers must again be closed carefully, to avoid contamination or absorption of water.

All amine hardeners 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.

The materials have a shelf life of minimum 2 years, when stored in their originally sealed containers. Due to selected raw materials, we expect minimal problems concerning skin irritation and allergies during processing.

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

 
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