Epoxy resin WWA ECO + Hardener WWB

WWA ECO is an epoxy system of exceptional clarity intended mainly for decorative applications, but also for making scientific instruments. Typical products made with WWA include "river table" tables, jewellery, watches and other items with embedded decorations.

With over 25 years of experience in formulating clear casting resins, WWA ECO offers the same advantages as the classic WWA systems:

• Perfect clarity, even at large thicknesses.
• Excellent UV resistance.
• Ultra-low viscosity, making degassing easier
• Moderate exotherm.
• Can be coloured with pigments and dyes.

RESOLTECH focuses on user safety – all WWA systems are free of solvents and CMR components (carcinogenic, mutagenic and reprotoxic substances).

Mix ratio

For the WWA ECO resin system the recommended mixing ratio by weight is 100/40 with hardener WWB4

Important information

Storage: To improve degassing, the products should be stored at 20 to 25°C. The colder the resin, the higher the viscosity, and the higher the viscosity, the harder it is for bubbles to escape from the resin. This means the storage temperature should always be above 20°C. However, after mixing, pouring and self-degassing (approx. 1 h), the mould into which the resin has been poured can be placed in a cooler room to cure at temperatures below 20°C, as this helps to avoid a high exotherm and thus allows thicker layers to be cast.

Mixing: The mixing stage is the most important. 99% of quality differences come from inadequate mixing. Follow these rules:

• Mixing ratios are by weight: always use scales and check that they are accurate – especially if battery-powered.
• Start by pouring the hardener into the mixing container.
• Add the correct amount of WWA resin.
• Mix thoroughly but slowly to avoid too many air bubbles.
• When the mixture becomes perfectly clear and homogeneous, pour it into a second mixing container: this is called the double-pot technique and ensures that unmixed resin and hardener from the sides of the first mixing container are not used.
• Mix again.

Casting: Once the mixture is homogeneous, it is ready to pour into the mould. Bubbles may appear at this stage; they will disappear within 15 minutes.

Curing: The thinner the resin layer, the longer it takes to cure. Conversely, the thicker the casting, the faster it hardens due to the mass effect.

For thick castings, working at a room temperature below 23°C is recommended, which reduces the risk of a high exotherm.

Manufacturer: Resoltech – a French manufacturer of epoxy resin systems with aerospace and marine certifications.