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EpoxAcast 690 is a two-part clear casting epoxy mixed 100A:30B by weight, sold for rigid, optically clear castings such as lenses and encapsulation work. Its very low viscosity makes mixing easy and limits trapped bubbles, and it gives a 5-hour working time with a 24-hour room-temperature cure and negligible shrinkage. It tolerates humid rooms without moisture sensitivity and can be tinted with UVO or IGNITE colorants. The main trade-offs are the gram-scale weighing it demands, a maximum pour of 3/8 in. per layer, and the ventilation and respirator the maker calls for.
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EpoxAcast 690 is a clear casting epoxy resin for industrial and art projects that need a rigid, clear finished casting. It is optically clear and suits lenses and encapsulation. The resin has a very low viscosity, so it mixes easily and traps few bubbles.
It is mixed 100 parts resin (A) to 30 parts hardener (B) by weight, so a gram scale is required. Working time is 5 hours and cure time is 24 hours at room temperature. Castings cure with negligible shrinkage and are very hard and strong. The resin is not moisture sensitive and can be used in humid environments.
The resin can be colored with UVO or IGNITE colorants or Cast Magic Effects Fillers. Dry fillers can also be added. Mix color or filler into Part A before adding Part B. Flexer Epoxy Flexibilizer can be added to some Smooth-On casting epoxies to make the cured epoxy softer.
