Why does my epoxy have crystals in it?
Crystallization of liquid epoxy is a known phenomenon that frequently surprises users who are not very familiar with epoxies. Crystallization may look like crystals, snowflakes, cloudiness, fog, turbidity, and even a solid, or a solid sediment, in the epoxy resin. The reason some epoxy resins crystallize has to do with their ‘super-cooled’ nature – they are supposed to be solids at room temperature, but have remained liquid below their solidification (freezing) point. Therefor super-cooled liquids have a natural tendency to crystallize. The timing of crystallization is highly variable and unpredictable. Factors effecting crystallization include resin purity, viscosity, additives, moisture content, the presence of ‘seed’ crystals, and environmental variables such as storage temperature and even a sudden cold shock. Crystals can be easily eliminated by increasing the temperature of the liquid resin to about 50°C (about 122°F) for a period of hours or until all signs of the crystals are gone. Allow the resin to cool back to room temperature, and proceed to use normally. There is nothing about crystallization that is damaging to the epoxy. It is the same as water freezing, and melting ice: the water is exactly the same before and after crystallization.
Answered by AskFOC Technical Team June 21, 2015
Have a technical question for Fiber Optic Center?
Please email your question to AskFOC@focenter.com and we will respond ASAP.
In addition to replying, we will post your question and our answer here on the AskFOC page. Everyone remains anonymous when we post so feel comfortable asking your questions. You can also search to see if your question has already been answered in the FAQs section below.
- Hengtong USA, LLC announced at OFC 2017 — a collaboration between Hengtong Cable Group and Inland Energy Inc. - April 13, 2017
- Press Release: Fiber Optic Center, Inc. announces FOC Cleaving Station with demonstration at ECOC 2017 - April 4, 2017
- Fiber Optic Center AskFOC: Looking for a replacement of isopropyl alcohol as a fiber optic cleaning fluid - March 16, 2017
- From the Industry: IWCS Seeks Abstracts for 2017 Symposium - March 14, 2017
- Trade show best practices, improved processes and a little pixie dust. - March 3, 2017
- Fiber Optic Center AskFOC: Cleaning the entire surface of an MT ferrule most effectively - February 24, 2017
- Fiber Optic Center AskFOC: What is the absolute strongest adhesive? - February 22, 2017
- From the Industry: Viavi Introduces the ability to intuitively eliminate OTDR complexities and ensure network quality - February 20, 2017
- From the Industry: AFL Awarded Five Technology Patents - February 16, 2017
- Press Release: Fiber Optic Center, Inc. announces Fiber Month at New Bedford Art Museum/ArtWorks! Sponsorship March 2017 - February 16, 2017