What is the proper curing temperature profile?
In most cases, cable assembly manufacturers are curing by placing their room-temperature product into pre-heated curing ovens—quite a thermal shock. Based on our observations, it seems that curing in this manner, with an oven temperature below 90 degrees C will usually not produce Core Cracking. In many cases, epoxy manufacturers will provide a range of acceptable curing time and temperature combinations for a given epoxy—-for example, the same epoxy maybe able to fully cure in 30 min @ 80 degrees C, or 5 min @ 120 degrees C. To avoid Core Cracking, choose the lower temperature.
Some cable assembly houses have had good success by curing with a “ramped” temperature profile: where the room-temperature connectors are placed in a room-temperature oven, which is then gradually heated until the curing temperature is reached. This lessens the thermal shock to the product, and may allow for curing at higher temperatures without Core Cracking. Curing with this method opens up the available range of epoxies available to use in your product, but does increase the curing time needed (ramp time + cure time), and can be more difficult to control.
READ THE FULL BLOG ARTICLE HERE: Does epoxy cause core cracking? Tips to identify and prevent this phenomenon
ADDITIONAL CONTENT & RESOURCES:
- Category Resource: FOC Epoxy Page
- Find More Information in this Blog: Helpful Epoxy Tips (and a Few Tricks)
Answered by AskFOC Technical Team August 22, 2019
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 focenter.com. Everyone remains anonymous when we post so feel comfortable asking. You can also search your question and others in our content search.
- Lapping film options, part 2 - May 18, 2020
- Standards for optical cable assembly manufacturers - May 7, 2020
- Key specifications of connectors - January 3, 2020
- Considerations regarding freezing epoxy – implementing process adjustment - December 16, 2019
- Considerations regarding freezing epoxy – THAWING - November 13, 2019
- Crystallization in Epoxies: How to Identify and Reverse it - October 23, 2019
- Measuring Insertion Loss and Return Loss Recommendations to Achieve the Best and Most Accurate Test Measurement - October 23, 2019
- Cross-Sectioning Fiber Optic Connectors: An Effective Diagnostic Method to Identify Defects and Resolve Process Issues - October 23, 2019
- The “Ideal” Fiber Height for a Fiber Optic Connector – and How to Achieve It - October 23, 2019
- Considerations regarding freezing epoxy – recommended length of time - October 23, 2019