Water clear casting epoxy system R2820 / H8390
Each kilo includes 0.67 kg resin + 0.33 kg hardener
Water clear, low odor epoxy system, designed for decorative parts and jewelry prototyping, where a high transparency finish is required.
The Fibermax Composites R2820/H8390 system exhibits very slow reactivity that allows casting of thick sections in one operation, without a change in color. With almost no odor during application, it hardens at room temperature, but in order to get the full mechanical properties (excellent resistance to thermal and physical shocks,) a post-cure from 40 to 80 oC is advised.
Curing time depends on the quantity of mix for casting, geometry of the part, thermal conductivity of mould and ambient temperature.
R2820 / H8390 system is very slow on small castings. To reduce cycle time, we advise to try several levels of temperature during the cure, in order to control the exothermic temperature in the part.
Advised post cure cycle:
Let cure at ambient temperature. Then increase the thermal properties of the system by a post-cure of 24 hours 40 oC or 8 hours at 40 oC + 12 hours at 60 oC.
Physical properties of R2820 epoxy resin:
Colour: Water clear Gardner < 1
Viscosity (mPa.s) at 20 oC: 5500
Density (Kg/l) at 20 oC: 1.176
Physical properties of H8390 hardener:
Colour: Water clear
Viscosity (mPa.s) at 20 oC: 120
Density (Kg/l) at 20 oC: 0.983
Mix properties of R2820 / H8390 system:
Weight ratio: 100 / 49 g
Volume ratio: 100 / 57 ml
Mix viscosity (mPa.s) at 20 oC: 950
Reactivity of R2820 / H8390 system:
Time to achieve the exothermic peak on 1 kg mix / Temperature taken in the middle of casting at 20 oC: 24 h / 30 oC
Dry to touch on 500 microns film at 20 oC: 24 hours
For detailed data sheet please contact.
Intrastat Number for this product: Epoxy: 39073000, Hardener: 29213091
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