3:1 epoxy resin is manufactured under the brand name Bondone Clear cast

Bondone® Clear Cast is two components, modified, low viscosity
epoxy system for clear casting and lamination application. The
system is clear, having excellent optical properties with negligible
shrinkage on curing. Faster productivity can be achieved, if curing
is performed at higher temperature near to 40°C.
Features The Epoxy casting system Bondone® Clear Cast offers:
 Glass like transparent casting with good hardness.
 Good wetting properties
 High gloss finish
 Long pot life
 Resistance to water and chemicals