RedRum Posted April 18, 2022 Report Share Posted April 18, 2022 Anyone with experience regarding heating up plastic in older microwaves and a potential heating inconsistency? Or the quality of the microwave and heating inconsistency? Im experiencing lower grade results using the same microwave, heating the same quantities and cook times as I have for at least 2 years on the microwave. I bought the Sharp microwave used on offer up for $5 and it’s been fine but recently I’m getting subtle degradation that I can see in my clear plastic. Quote Link to comment Share on other sites More sharing options...
Les Young Posted April 18, 2022 Report Share Posted April 18, 2022 Wasn't long after i started having to heat longer that mine quit. Quote Link to comment Share on other sites More sharing options...
wchilton Posted April 19, 2022 Report Share Posted April 19, 2022 I've noticed that once a spot in the plastic starts to burn the scorching continues from that spot. Waves bounce around inside the microwave oven and sometimes there can be a "hot spot" where more waves converge. Make sure the fan is turning freely (fan inside is used to scatter waves) and also make sure there are no rust spots, etc that could change the way waves bounce around. Might also try stirring a little more or more often, especially after plastic has gelled. The thicker plastic cannot distribute heat as much by convection (currents) but mostly by conduction which is a much slower process. 1 1 Quote Link to comment Share on other sites More sharing options...
RedRum Posted April 19, 2022 Author Report Share Posted April 19, 2022 15 hours ago, wchilton said: sometimes there can be a "hot spot" where more waves converge. May be it. I’ll run 2 pryrex togother and the tray rotates but the two Pyrex don’t heat up evenly Quote Link to comment Share on other sites More sharing options...
Les Young Posted April 19, 2022 Report Share Posted April 19, 2022 Also if you're making two different colors one will get hot way before the other if ones dark & ones a light color so keep that in mind which also means remelts usually act the same way too. Quote Link to comment Share on other sites More sharing options...
Tiderunner Posted April 20, 2022 Report Share Posted April 20, 2022 Define "subtle degradation" in your clear plastic. That could answer all your questions. My microwave is 5 years old. Cheapo bought at Target. No issues. With our household ones, when they started taking longer to heat they usually deuced the bed soon after. Quote Link to comment Share on other sites More sharing options...
