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EP 243, Fast, UV resistant, clear, Epoxy resin, thin castings

Epoxy resin EP 243 is an fast cure epoxy resin for casting, coating and  laminating epoxy resin specially designed for use in industrial applications that require a strong and durable casting with low color and high UV resistance. Epoxy resin EP 243 has excellent water and chemical resistance, excellent mechanical properties and excellent adhesion to a variety of surfaces. The EP 243 is also often used for transparent and clear UV-resistant coatings such as on wood, table tops, furniture, polyurethane and can be used as a laminating epoxy resin. The EP 242 is also often used for transparent and clear UV resistant coatings such as on wood, table tops, furniture, polyurethane and castings of 5 -35 mm thickness.

The EP 243 is ideal for making transparent and clear castings with thin layers and where faster drying is required with 2-5 mm thick castings.

Special features

  • fast curing epoxy system
  • Low viscosity, easy to apply
  • Low yellowing tendency when exposed to UV
  • Excellent mechanical properties
  • Excellent chemical and water resistance
  • Excellent adhesion

Mix ratio: 100A: 50B (by weight)
Processing time (min.):> 25-30 min.
Demoulding time: 24 hours
Full cure: 7 days
Minimum curing temperature *: 15 ° C
Recommended processing thickness: 2-5 mm

Viscosity: 600-900 mixed mPa.s
Density: 1.03-1.13 g / cm3
Tensile strength (N / mm2): 60.0 – 65.0 MPa
Hardness (Shore D): 80-85
Packaging: 1.5 kg, 7.5 kg, 37.5 kg, 400 kg.


Before using this epoxy, make sure that the epoxy resin is compatible with the surfaces you want to use, but also the reinforcements or fillers will be used. This can easily be done by doing a small test and seeing, for example, inhibition. Inspect both components for signs of crystallization. Crystallization can cause the liquid to become cloudy or viscous, and in extreme cases the product can become solid / crystal. If any of the components have crystallized, heat to 40 ° C with sufficient extraction to remove any fumes. Shake the package until the product becomes a clear liquid. Let the product cool down to room temperature before use and do not apply epoxy resin if the ambient or substrate temperature is lower than the minimum curing temperature.


Thoroughly mix the resin and hardener according to the indicated mixing ratio, avoid air entrapment and make sure that the material on the bottom and sides of the mixing bowl is well stirred in the center. By venting the mixed material through vacuum chambers, there will be no air ingress, air bubbles and voids in the casting. The two components must be mixed and applied within the processing time.


This Epoxy resin system is room temperature curing RTV epoxy resin. The curing percentage of the EP 243 is influenced by the temperature. This resin must be poured into the product at temperatures above 18 ° C and with minimum thickness. Incomplete curing can occur if it is applied thinly or poured into thin parts. The exact cure time depends on the size and geometry of the casting. With thinner castings, the curing process takes longer than with thicker castings. On average, the epoxy resin can be demoulded after 48 hours.

Incomplete curing can lead to slight deformation or deformation of the components when forces are applied. This feels a bit tough and pliable. If the product is softer than expected, take a longer curing time or heat it to 30 – 40 ° C in an oven. Recommended casting The above thicknesses may not apply to small or large volume castings. Thicker castings shrink more than thinner castings. This is because heat is generated during curing. this heat is higher at larger volumes and generates a small shrinkage.

If desired, a step-wise post-treatment can be used to maximize the cured properties. Allow the product to cure at room temperature for a minimum of 24 hours, then heat to 40 °C for 1 hour in the oven followed by 60 °C for another 1 hour and then heat at 80 °C for 3 hours. To avoid deformation during the post cure cycle, the molded object must be placed on a conformer.

after the heat treatment in the oven, let the oven cool down slowly to room temperature. Sudden change in temperature can cause deformation or warping. Heating the cured part can cause a small degree of UV yellowing.

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