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.
- Fiber Optic Center AskFOC: Determining minor or normal slight binder indentation on buffer tubes - October 16, 2017
- Press Release: Fiber Optic Center, Inc. introduces Viavi FiberChek Sidewinder, first fully autonomous handheld inspection and analysis solution for multifiber connectors - October 10, 2017
- Press Release: Fiber Optic Center, Inc. announces the promotion of William Sorell to Shipping Supervisor - October 5, 2017
- Fiber Optic Center AskFOC: Where does dust based end face contamination come from? - August 16, 2017
- Fiber Optic Center AskFOC: What is the highest capacity fiber count an OCETS can handle? - August 9, 2017
- Fiber Optic Center AskFOC: Why is it important to clean both ends of the connector pair? - August 8, 2017
- Fiber Optic Center AskFOC: How residue based contamination cause signal loss between a mated connector pair? - August 2, 2017
- Press Release: Fiber Optic Center, Inc. announces the appointment of Larry Donalds as Business Development, Fiber Design and Manufacturing, Technical Sales - July 24, 2017
- Fiber Optic Center AskFOC: What happens if there are dust particles on one of the connector end faces during the connector mating process? - July 18, 2017
- Fiber Optic Center AskFOC: OCETS: How do I configure the software to work with the chamber? - July 12, 2017