4 ms·
>It's likely the washing process still scratches the glass but it's less visible. It doesn't increase the "safe" life of the glass, as bacteria is still able to
by Rinzler89 2y ago
>It's likely the washing process still scratches the glass but it's less visible. It doesn't increase the "safe" life of the glass, as bacteria is still able to get into those scratches.
Honestly, I've never heard of this before and I have friends working in the restaurant industry. Is it a real documented health hazard or a FUD spread by the glass manufacturers to create perpetual demand for their product (Glass As A Service)?
My grandma still uses the same glassware from like 30+ years ago and washes it by hand and it doesn't look tarnished at all. Is she and our family likely to die from drinking from those old glassware with micro scratches?
- scott_w 2y ago> and washes it by hand That's the key part here. Pubs use commercial dishwashers which effectively shot blast your dishes and glasses. There's a reason you can see "Not dishwasher safe" on certain items: because it'll blast off the nice patterns. I know because I've done it by accident.
- sfn42 2y agoNot sure what shot blast means, but as far as I know dishwashing machines just spray hot water and detergent on everything. I guess that could cause abrasion if there's hard and sharp particles in the water, but I'm not sure what could cause those. Maybe if glass breaks during washing, but I'd assume the machine filters the water before reusing it.
- scott_w 2y ago> as far as I know dishwashing machines just spray hot water and detergent on everything There's a couple of sources: - The dishwasher tablets have a mildly abrasive substance - The water itself (especially in the UK) can carry abrasive substances from the pipes
- ThePowerOfFuet 2y agoIf it was in the pipes, handwashing would do it too. Dishwasher detergent does not contain abrasive substances; dissolve a teaspoon of it in a glass of hot water and see for yourself.
- scott_w 2y agoI’m not convinced because I can run pellets over a surface by hand and not scratch it, yet a shot blast will strip paint off easily. Same substances with different processes produce different results.
- Rinzler89 2y ago> There's a reason you can see "Not dishwasher safe" on certain items: I've nerve seen it on glassware though. That warning is usually for plastics since they melt at hot dishwasher water, and on certain metal cook-ware where the caustic dishwasher detergent will corrode the metal anodization, but glass is usually resistant to both temperature and caustic detergents, which is why it's used in bio labs for storing and mixing harsh chemicals, granted, different composition of glass, but it's still glass not adamantium. So this point doesn't scan for me.
- scott_w 2y ago> I've nerve seen it on glassware though. No but the process that strips the paint off delicate crockery is self-evidently abrasive, which stands to reason when you look at the scratch marks in glass that has been through too many cycles. It's not on glass because an individual washing won't destroy it but repeated washing eventually scratches the glassware to hell. I've seen it with my own eyes.
- seszett 2y ago> self-evidently abrasive, which stands to reason when you look at the scratch marks in glass that has been through too many cycles. Marks on glass are not due to abrasion, they appear because glass is slightly soluble in alkaline water, which is the case in dishwashers. Porcelain and stainless steel do not get scratched by dishwashers for example.
- scott_w 2y agoThanks for the explanation! I guess this means there’s no way to make even “unbreakable” glasses to not mark?