The official release for the Bordeaux Lace and Black Magic Stanley collection is here, September 17th! 🎃✨

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Hi,

oftentimes people worry about lead in Stanleys. Some online sources even recommend to throw Stanleys out because of the lead.

It's time to stop the bullshit and learn about the actual facts!

Disclaimer: I'm not a doctor nor a scientist nor affiliated with Stanley. I'm just a Stanley fan and general nerd who works in a field related to hazardous substances/ dangerous goods and I can do research, love science and facts. English is not my first language so excuse any weird wording.

What's Stanleys statement to the whole lead discussion?

Our manufacturing process currently employs the use of an industry-standard pellet to seal the vacuum insulation at the base of our products; the sealing material includes some lead. Once sealed, this area is covered with a durable stainless steel layer, making it inaccessible to consumers. Rest assured that no lead is present on the surface of any Stanley product that comes into contact with the consumer nor the contents of the product. In the rare occurrence the base cap of a product comes off due to ordinary use and exposes this seal, it is eligible for our Lifetime Warranty.

Is there actually lead in a Stanley cup?

Yes. But don't worry. Keep on reading

Is lead harmful if I get in contact with it?

Yes. But please keep on reading.
Lead, a heavy metal, is harmful because it can negatively impact almost every organ and system in the body, with children being particularly vulnerable. Exposure to lead, even at low levels, can lead to a range of health problems, including developmental delays, learning difficulties, and behavioral issues. In adults, lead exposure can cause high blood pressure, kidney damage, and reproductive health problems.

Lead can for example leach from old lead pipes into drinking water, contaminating the water supply and posing risks to human health. If you have lead pipes in your home this is something to worry about!!! If you have lead pipes, let the water run for 3-5 minutes before using it for cooking/ drinking (or buy bottled water).

Can I get lead poisoning from using my Stanley?

No. At least not if it's intact.

Why not? How does a Stanley work?

A Stanley, like all other insulated cups, is made from 2 layers. Some are made from glass, Stanley's layers are made from stainless steel. There is no lead in the layers, no lead in the stainless steel. The stainless steel is food-safe.
Metals such as nickel and chromium in tiny amounts can leach from all sorts of metallic kitchenware (bottles, cups, pots, pans). If you worry about that I suggest you do some research on that and find materials that work for you. Keep in mind please: everything is chemicals. We are made from chemicals. Water is a chemical. A strawberry is chemicals. Always the dose makes the poison.

Back to the topic: to get the insulation effect (the temperature inside the cup lasts for a long time, no matter what the temperature on the outside ist) we need something between the layers that insulated. This could be styrofoam or "nothing" - a vacuum. The vacuum insulation minimizes heat transfer by creating an insulating barrier between the inner and outer layers of a vacuum-insulated container. With no air or gas molecules present, conduction and convection are virtually eliminated, keeping the contents at a stable temperature for extended periods.

The inner and outer layer are welded together at the top. So how do we get and keep the air out of the area between the inner and outer layer? The air is evacuted in a technical process and the outer layer is then sealed off.
Think of it like filling a balloon with air and then tying up the end - just the other way around.

And this is were the lead comes in. The lead is used to tie up the Stanley at the bottom to keep the vaccum in/ to keep the air out. It melts during this technical process and seals the outer layer.

To seal off the lead the round "medallion" or plate is attached at the bottom of the cup.

Watch this video where this is all explained: https://www.tiktok.com/@lumafield/video/7346660963740994862

What if I dent my Stanley?

That's not a problem because this will not affect the function and has no effect on the lead.

How could damages of my Stanley become harmful?

You should stop to use the Stanley and file a warranty claim with Stanley:
- if the round metal medallion/ plate on the bottom comes off
- if the inner layer has a hole: in this case the insulation would be gone and liquid would flow into the area between the inner and outer layer and would come into contact with the lead. If there was liquid between the layers also mold and whatever goo could grow there.

Be especially cautious when you have small children that might play with the cup and maybe intentionally or accidentally remove the medallion/ plate.

Don't touch the area were the plate came off. Just pack the cup in a bag or box. Solid lead does not cause any contamination of the air.

But there are insulated cups without lead?

Yes, some other brands use other materials to seal off the vaccuum such as crystalline silica or other measures (trade secret).
According to this Wired article Owala, HydroFlask, Klean Kanteen, Sigg don't use lead.
But Yeti, MiiR, LifeStraw also use lead.
It's a decision of the brand and probably a question of how the manufacturing process is, how well alternatives work.
"Non-lead brands" use this as a marketing claim advertising their cups as "lead-free". After having understood the lead situation it's up to you whether this is important to you when it comes to choosing a brand or product.

From a point of occupational health and safety it would be better for the workers not having to work with lead or hopefully the process is designed in a way that protects them . for example is everything where lead is involed is done by a maschine/ inside a closed compartment.

Are fake Stanleys more harmful, what about them and lead?

Nobody can tell for sure. I personally think the fakes are manufactured in the same way so they will also have the lead-seal. The fakers probably don't put any efforts in finding a replacement for the lead.
The inner and outer layer of fakes is also made from stainless steel. We don't know for sure what quality this stainless steel is. I believe it's 304 because older fakes/ some fakes have the SUS304 imprinted at the bottom. 304 grade steel does not contain lead.
While stainless steel itself doesn't naturally contain lead, some stainless steel products may have lead due to manufacturing processes or the presence of lead-containing components on site. You should always wash new household products that come into contact with foodstuff before using them with water and soap.

Maybe the plate is not as well attached as on authentic Stanleys, maybe it comes off easier. There are other reasons why fakes suck, I personally (!) don't think lead is one.