I would love to have a glass plate for the inside of my microwave. Unfortunately over cooked popcorn broke our glass plate.

It will be fine. They aren't made for sustained cooking on high power. Popcorn is dry but oiled, so it gets very hot and burns. You can use the glass carousel plate or replace it. Depending how big the crack is, any water in the crack will finish it off. A new glass tray is $57. A new Microwave the same is $319. Samsung are one of the better makes.

https://www.google.com/search?q=samsung+me18h704sfs+replacement+glass+plate

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Arcing will occur if you have any metal inside the microwave, or if the powder paint on the inside has been damaged. If the paint is damaged dispose of the microwave

i had that problem. the solution is glass. my turntable is not glass and microwave popcorn must rest on glass to pop. just place a glass dish upside down and cook it on that.

All that is required to crack/break an item that is microwave safe is a fine crack or deep scratch. Water will expand so quickly as the microwave energy heats up the water, it turns to steam and cracks the plate with the pressure build up.

I'm not sure why they would have sent you here, but, when it comes to microwave plates, they can often reach an expensive price when purchasing on their own, if and when you can find somewhere that sells them.
My suggestion is keep an eye out for any dis-carded microwaves that may have glass plates in them still or to contact the manufacterer to purchase a new plate, but be prepared to be met with a high cost
Sorry for the bad news. Good luck.

It's best to put the popcorn bag on an upside-down paper plate, and be sure it's off-center, not in the center of the turntable.

Raising the plate and keeping it slightly off center allows more even heating and also protects the glass tray from overheating repeatedly in the center, which can eventually lead to its cracking.

If it still won't cook properly, the magnetron, cooling air flow or power line voltage may be less than it should be.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

You can order a turntable of off eBay and as for the other tais a trial and error thing you will just have to mess with it microwaves vary

Are you cooking it this way, as shown in the owner's manual?

"Use an overturned 9 or 10 inch oven proof glass pie plate on top of the
turntable when popping bagged microwave popcorn."

You can also use a paper plate in a pinch, but as always, never leave a microwave unattended while it's cooking, since some paper products can have impurities which will allow overheating and possibly fire.

This is a convection oven, so it has a metal turntable tray.

Microwaves cannot penetrate the metal from below like it would on a standard microwave's glass tray, allowing for even heating.

If you've lost your owner's manual, you can get it here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

According to the owner's manual (which you can download free from us here),

1. Place the bag of popcorn over an upside-down 9" glass (or paper) plate.

2. Touch POPCORN pad.

It will cook and stop automatically.

If this does not work, you may have a bad humidity sensor or control board, etc. and parts for this model are generally no longer available.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.