That's a LOT of elastic!
Here is bundles of 1/8" wide x 8 yards elastic, drying after soaking in a flame resistant solution.
I've flame tested the elastic before when I first settled on the solution ratios.
On this test I'd take pictures.
It's a simple test, holding the elastic close above a candle flame.
In the test the elastic was about 3/8" above the flame.
Here's the result -
The top line of elastic didn't get the flame resistant treatment.
At just a few seconds the elastic melts and catches fire.
The lower elastic was soaked in the flame resistant solution.
It was held above the candle flame at the same height and for the same time. There is just a slight distortion and yellowing of the elastic.
Please note: The Odd'l Rockets treated elastic shock cord material is flame resistant, not flame proof.
Over time, elastic and plain rubber shock cords can deteriorate from the ejection charge flame and heat. The flame resistant treatment will extend the shock cord life. There may still be some smoke discoloration after flights.