Stainless and SIlicon baking forms.

[itsmoked]

When greasing aluminum cake pans the paper towel gets a dark residue on it. I rather expect this aluminum oxides and I often use wax paper to avoid food contact.

Well today I get a very dark residue while greasing my stainless cookie sheets what is it and why?

Is there any hazard with silicon cook sheets contacting food?

Thanks for any insights!

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[CoryPad]

At what stage do you see dark residue? Before exposure to high temperatures, or after?

Are you sure you are using the word silicon correctly? Silicon is an element, a semiconductor, used for making microchips. Silicone is a generic name for a group of silicon-based substances, usually elastomeric polymers like polydimethylsiloxane.

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[EdStainless]

What oils are you using? My guess is that you are seeing some breakdown of the oil at baking temp. If you use low sability oils you will form varnish on the sheets. If this builds up too much you can cut it with citrus solvent cleaners.

The other possability is that hte sheets have been rubbing against each other and there is a little bit of metal wear residue coming off of them.

Baking molds of silicone rubber have become popular. I would bake them once before using them. I would also watch and when they begin to crack or tear I would pitch them.

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Rust never sleeps
Neither should your protection

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[swall]

EdStainless--by "baking molds", do you mean muffin cups and such? Just curious.

 

[itsmoked]

CoryPad; On initial greasing of washed/dried cookie sheets.
And yes I meant Silicone! Thanks for the correction.

EdStainless; This is before heating so I don't think it is varnish. We do definitely see the varnish after baking.
No rubbing has occurred because of the sheet shapes. (they can't nest)

I was concerned that the interstitial material that gives elastic materials their flexibility(I forget what it's called){the stuff that slowly leaks out of keypads on our remotes to render them useless} might come out of the Silicone sheets and render us useless.

Thanks for the direction.

swall; Yes! Muffin and cup-cake forms of Silicone and actually flat sheets that you can line cookie sheets with to avoid having to grease them.

Thanks,
Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[CoryPad]

Keith,

I have seen what you are describing. Likely this is a combination of aluminium oxide, aluminium particles, and other foreign particles (food, dirt, etc.).

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[EdStainless]

If the stainless molds have been formed then it could be eihter metal residue or lubricant residue from the forming operations.
You are correct in assuming that 'things' come out of the silicone. But these materials are used for a lot of biological and medical applications. I wouldn't be too worried.

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection

http://www.trent-tube.com/contact/Tech_Assist.cfm