Is your epoxy resin white, flaky and no longer usable? Follow these tips on crystallization!
First of all, the good news: The crystallization of epoxy resins is completely reversible and can be reversed without leaving any residue. In the same way that water freezes at very low temperatures and turns into a hard lump, epoxy resin also reacts differently to low temperatures and strong temperature fluctuations.
Signs of crystallization include cloudiness, floating crystals, clusters of crystals, or completely solidified material. Since crystals contained in liquid resin have a higher density, they sink to the bottom of the container and solidify there. The milky white substance collects there and on the sides of the container and begins to spread. If the resin is exposed to low temperatures for a long time, this sandy texture will eventually take over the entire contents of the container.
Does crystallization occur with every type of epoxy resin?
Yes and no. A particularly high purity and a very low viscosity of the material promote a strong crystallization. This always occurs when the material comes into contact with very low temperatures or a sharp temperature fluctuation. However, it can also happen that epoxy resin does not fully crystallize in such situations, but only becomes slightly cloudy .
Attention: Even a slight clouding can have an impact on the epoxy resin and negatively influence its curing process.
How do I remove crystallization?
After opening, the resin (A component) should always be checked for its condition. Especially in the autumn and winter months, the resin can cool down significantly and crystallize during transport.
If crystallization is detected, we recommend heating the closed container of the affected A component in a water bath . The water temperature should not initially exceed 60°C. If the crystallization has not noticeably reduced after one hour, the water temperature can be increased gradually (up to a maximum of 100°C). It is also advisable to turn the crystallized lump every now and then and stir it thoroughly to speed up the process. Depending on the amount of material affected, this process may take some time.
Once all the crystals have disappeared, the resin should be allowed to cool to room temperature before use. The epoxy resin can then be used normally again.
Tip: To measure the temperature correctly, we recommend using an infrared thermometer. This can be purchased here in our shop.
How do I avoid crystallization?
To avoid crystallization, epoxy resin should always be stored at the optimal room temperature (15°C-20°C) if possible. If this is not the case, we recommend proactively carrying out the water bath described above before use.
Note: High temperatures have no effect on the resin component and do not cause any damage. There is also no impairment or even hardening of the material, as there is no mixing with component B (hardener).
If any problems occur, please contact us before actual use .
Conclusion:
Don't panic if your epoxy resin suddenly becomes milky and lumpy - this is not a permanent condition! With a little patience and the right heat treatment, the crystallization can be dissolved without leaving any residue. Just make sure that you use an appropriate storage and processing temperature so that your resin is always ready for perfect results in the future. If you are unsure, do not hesitate to contact the manufacturer or retailer - then nothing will stand in the way of your next epoxy resin project!
