Jump 117 pioneered and has done the most work on this technique, so you might check out : https://www.icmag.com/ic/showthread.php?t=168388
Thank you for your kind words Gray Wolf!
@2bags
It should be noted that the duration of about two hours I was determined for the temperature -20℃, which is well maintained in a thermos.
Without thermal insulation temperature of coffeepot and its contents first will rise to the boiling point of isobutane -11.7℃, and dissolution occurs more rapidly than at -20℃.
When all the isobutane evaporated, coffeepot can warm to the boiling point of n-butane -0.5℃ and further dissolution of the resin at this temperature will occur much more quickly.
How many undissolved residual resin remains on the material when the duration is limited to 15 minutes?
Will there be enough time to dissolve all the necessary resin until all the gas will evaporate?
I hope that your experiments will shed light on these questions.
I would recommend to arrange some insulation and soak longer in colder butane.