cooking to long

[res45]

does it hurt anything? I coated a bunch of bullets yesterday and got distracted and they baked about 45 minutes at 410 degrees. Can you overcook them?

I baked my first couple batches of bullets at around 450+ degrees till I got an oven thermometer and set the dial on my toaster oven and they shot just fine with no issues. There seems to be a good bit of leeway on time an temperature although now I try to keep things as close to 400 degree for 20 min. as possible.

[Grmps]

PC and Hi-Tek coating have "off-gassing" (create fumes) when baking. The lead may emit a slight residue also. All manufacturers strongly recommend not to bake boolits in the same oven you bake food in.

[Smoke4320]

^^^^^
"PC and Hi-Tek coating have "off-gassing" (create fumes) when baking. The lead may emit a slight residue also. All manufacturers strongly recommend not to bake boolits in the same oven you bake food in."
Bold for emphasise

[Dragonheart]

As cheap as one can buy a really good oven, why take a chance. My last Hamilton Beach Countertop Convection Oven I picked up at a Goodwill Store for $20 and it appeared to have never been used.
I see free or almost free wall and freestanding ovens just for hauling them away.

[Mr_Sheesh]

Normally I'd tease "No sense of adventure!", but, lead poisoning is "probably" a bad idea!

[Plate plinker]

Normally I'd tease "No sense of adventure!", but, lead poisoning is "probably" a bad idea!

Or the ingestion of unneeded hydrocarbons in your food. This guy needs to think about what could happen if he hooks up with a hottie that can bake.

[Dragonheart]

I wouldn't worry about the lead poisoning I would be worrying about what was cooking off from the polymer. Everyone gets upset now about plastic in the microwave and that is way below 400+ degrees. My toaster ovens have a coating on the interior & I regularly have to clean the glass so I can read the thermometer.

[Boogieman]

I baked HF red coated boolits at 400f for one hour and dumped them into ice water. They passed the hammer test. The Bh went from 11 to 18.

[popper]

Testing this over-temp/over-time some more, Smoke's red. Pushed temp up to 440F for an hour and WD. Several had some coating 'removed'. I did notice under 20x magnification - alloy has started to 'bubble' out small pimples of alloy. PC definitely missing in those areas. Pb/Sb/Cu only but Pb has lowest melt temp. Tin has lower melt temp. so effect may be worse for those alloys.
Missing strip is ~ 1/2x1/8 and I didn't find it in the bucket of water, therefore I assume it lost 'grip' on the boolit and snapped like a rubber band. No evidence of tearing of coating but a definite edge where missing. Still smashes fine, can't scrape with my fingernail. No discoloring.
Conclusion - can't hurt the stuff by cooking until you get over the slump temp of the alloy.
edit: I was really trying to re-harden some PB for the BO, accuracy went to pot with them. I have been using a hot plate for cooking - evidently didn't get hot enough. So back to the oven until I can rig the plate to the PID. Did the hardness comparison in the vice this morning - dent in the previous, none noticeable in the re-hardened. Have a couple jugs of boolits to redo. Got the K wire, need to get connectors and re-wire the controller. And find a powder that will run them slower so I can use the soft boolits for pig hunting.

[popper]

Pic from above test, Didn't find the strip that is missing, some off the base stuck to the NSAF.
Attachment 220302