Polycraft FC-3680 Black fast cast resin is an odourless two component polyurethane system which is designed for rapid demould times and can be used filled or unfilled. Polycraft FC-3680 Black can be used unfilled in prototyping and model-making areas, or filled with mineral or metallic fillers in pattern-making or for thermoforming tools. Polycraft FC-3680 Black gives outstanding colour density and removes the need for black pigmentation.
• Strong thin sections
• Good thermal resistance
• Excellent impact resistance
• Excellent dimensional stability
Ensure that the mould is clean and dry and for flexible moulds, use RTV silicone rubber. If the mould is wooden, ensure the wood is well sealed with varnish and/or wax based release agent.
Shake the Part A thoroughly in order to homogenise the resin. For best results, ensure that the two components are at 20 – 25°C before mixing.
When using unfilled, add the correct amount of Part B to the Part A and stir for 30 seconds. Pour carefully in one place into the mould in order to avoid air inclusion. If using filled, we recommend the use up to 200% filler, Aluminium Trihydroxide for general bulking out and shrinkage reduction, aluminium Powder for higher temperature applications. Large quantities of material, filled or unfilled.
The casting can generally be demoulded in 60 minutes at room temperature. The precise demould time will vary with casting thickness, as thin section units will cure slower than thicker section units. When casting thin wall sections, ensure that the mould and resins are at least 20 – 25°C to facilitate a good cure and reduce the risk of brittleness. To reduce the cure time, the mould can be pre-warmed to 40 – 60°C. It is not recommended to heat the liquid components.
Mix Ratio by Weight : 100 : 100
Mixed Viscosity mPas : 250 - 450
Pot Life (200g, 25°C) : 3 - 4 Minutes
Demould Time : 60 Minutes
Shore D Hardness : 70 - 75
Tensile Strength Mpa : 25 - 30
Elongation at Break % : 6 - 9
Linear Shrinkage % : < 0.2
Heat Distortion Temp : 60 - 65°C