Clear Casting Epoxy Resin by Smooth-On
- Product name: EpoxAcast 690.
- Clear liquid epoxy for castings that require a strong, hard finish.
- Each cast layer should be between 3-10mm thick.
- For making jewellery, river tables, pouring into moulds etc.
- Cast in layers between 3-10mm thick. There is no limit to the number of layers that can be added.
- Used to make jewellery and beads, used to create ‘river tables’ and poured into moulds to create castings. Excellent for adding pigments and colourants and for securing stones and crystals in resin art. Also suitable for electronic assembly encapsulation applications where its clear nature allows component identification. Castings cure with negligible shrinkage and are very hard and strong.
- UV Stabilised (slow to yellow compared to non-stabilised resins).
- Not very prone to amine blush but if this does occur take the steps required to remove it.
- Not approved for food contact and not suitable for heat contact above 46oC.
- Manufactured by Smooth-On in the USA.
- The ratio of Part A and Part B is 100A : 30B by weight.
- UV Stabilised (slow to yellow compared to non-stabilised resins). It will still yellow if exposed to UV light or sunlight for long periods or if exposed to temperatures above 46oC. If strongly pigmented or painted then it is fine for outdoor use.
- This makes it less sensitive to application conditions but as amine blush can occur, do not use the resin in cold moist conditions.
- It is often poured into moulds or onto surfaces that have retaining sides e.g. river tables.
- If glass, small stones or powder pigments etc. are added they can make the resin thick enough to pour onto flat surfaces and not run. We have noticed that after adding pigment powders, a 15 minute wait allows the resin to thicken somewhat reducing its tendency to flow. You can see pictures of resin art made this way on flat boards.
- The low viscosity allows entrained air to rise up and escape easily. Torching is often not required and air is usually not a problem with this resin which is a big advantage.
- Do not exceed this thickness in a single layer. Thicker layers may generate too much heat during curing which can damage the resin or the mould
- This resin is not ideal for very thin layers, use in layers between 3-10mm thick.
- The long pot life allows larger quantities to be mixed and used than with short pot life resins. Pot life can be expected to be around 5 hours (for 300g batch) but it decreases in warmer conditions and for larger quantities.
- The relatively fast curing time has obvious benefits. Thin layers, however, cure much slower.
- Cure time is dependent on layer thickness. Thicker layers get hotter and thus cure faster. Expect a cure time of around 24 hours for thicker layers of about 9mm. For thinner layers below 6mm thickness the cure time will be longer, 48 hours or more.
- They resist moisture, solvents and dilute acids.
- They can be machined and can be painted after the application of a suitable primer (remove all release agent before priming).
- Cure times mentioned refer to the time it takes to feel hard (practical cure time). As with other resins the full cure time to maximum strength takes four week or more.
Basic safety and health information is contained in our User Instruction document which is sufficient for the casual user. The Safety Data Sheet for this product can be found in the Technical Section of this website.
1.30kg (1.18 litres)
6.50kg (5.91 litres)