They make great lead flux
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They make great lead flux
I have noticed that some types of plastics become brittle when subject to a couple freeze/thaw cycles. I first noticed this with a couple food safe plastic buckets.. Could that be what happened to these old wads?
A trick that works with nylon zip ties is to boil them in water, I suspect wads are polyethylene so it probably won't work but you've nothing to lose.