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Tips, Techniques, and Questions -- Technical questions or tips

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  #1  
Old 2018-12-22, 9:29am
ewok1234 ewok1234 is offline
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Default 304 Stainless bottle stopper?

I'm new to making bottle stoppers and saw where nilesbottlestoppers.com was recommended by a few of you. I found another site that was cheaper and ordered stoppers from them: stainlessbottlestoppers.com My neighbor is a machinist and said I did not get food grade stainless as advertised. He put a magnet on the stoppers and said it would not stick to 304 grade stainless steel.

My question is; does it really matter what grade they really are? I like their prices but don't want returns from my customers.


Last edited by ewok1234; 2018-12-22 at 9:34am. Reason: Add photos
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  #2  
Old 2018-12-22, 6:26pm
ESC ESC is offline
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304 is perfectly safe for food and is non magnetic. 430 is not generally used for food and is magnetic. Not very resistant to rust either.
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  #3  
Old 2018-12-23, 9:51am
Lampwork49 Lampwork49 is offline
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If it's not 304 it's more susceptible to corrosion due to acids in the wine
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  #4  
Old 2018-12-24, 8:05am
ewok1234 ewok1234 is offline
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Thank you, and so if the magnet sticks, does that mean it will rust in wine and maybe I should return the stoppers and ask for a refund before I even use them? How can a company advertise a specific material if it's not? never mind, I think I know the answer to that!!
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  #5  
Old 2018-12-24, 2:20pm
losthelm losthelm is offline
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ask them what alloy is used.
304 can get magnetic in some situations, usually less so than 4** series steel.
you may have noticed this with butter knives in restaurants.
430 series steel is usually more expensive and used in some brewing equipment like the pipe flanges.
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  #6  
Old 2019-01-06, 7:33pm
Lampwork49 Lampwork49 is offline
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Default Stainless

308 is mostly used in good brewing and tap systems
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  #7  
Old 2019-01-06, 7:34pm
Lampwork49 Lampwork49 is offline
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308 is used in most GOOD brewing and tap systems
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