Design Explained – Our SlickSteel® Interiors and Nonstick Coatings

Which is better? Nonstick coated or not coated?

At Zojirushi, we know they’re both great!

This month we’re excited to share the design and engineering behind our nonstick and SlickSteel® bottle, mug, and food jar interiors. Both interiors are easy to clean. Both interiors have been proven durable. And both interiors are hygienic and repel stains. So why have two types of interior finishes?

Well, as usual, we believe in customer-centric design, and offer our products in both nonstick and SlickSteel® finishes to satisfy your requests.

As cleanability is important to our customers, many Zojirushi products are nonstick coated. Our nonstick coating is made using PTFE, or polytetrafluoroethylene, a polymer that is applied in a two-step process with a primer and a topcoat. It is nonreactive, inert, ultra-smooth, hydrophobic, and resistant to abrasions, corrosion, and heat. It’s ideal for use in containers that hold food or beverages, since it doesn’t stain or absorb odors. In Japan, our nonstick interior mugs are highly prized for their durability and cleanability, since they are primarily used for holding coffee and tea, which tend to leave odors and stains. Some of our newer bottles, such as the Stainless Mug SM-TA and Stainless Bottle SJ-JS, even utilize double-layer nonstick coating, to provide additional protection against salt-containing beverages such as sports drinks, as materials like salt will corrode stainless steel.

The SlickSteel® interior finish was introduced for our customers who prefer to avoid PTFE nonstick. We’ve electro-polished the interior, resulting in a surface that resists corrosion and repels stains without the use of nonstick coating. Electropolishing works using the principal of electrolysis, whereby the stainless steel is immersed in an ionized, electrolytic solution which is subjected to an electrical current. The reaction that results from the charged solution removes the microscopic peaks and fills the microscopic valleys in the stainless steel, creating an ultra-smooth surface made without any mechanical smoothing, grinding, or buffing.

Because eating out of Food Jars would require a utensil to be used, we use our SlickSteel® interior in all of them so that the nonstick coating is not scratched. Some of the other products with SlickSteel® interior are the Stainless Bottle SV-GWE50, our Stainless Mugs in models SM-JHE, SM-KHE, SM-SHE and our Travel Mug SM-YAE48. Both of our Stainless Tumblers in models SM-DA and SM-DD are SlickSteel® finished.

No matter what your preference is, both of our interior finishes showcase the same smart design and expert engineering you’ve come to expect from Zojirushi. Feel free to call our friendly customer service with any additional questions and of course, to help you select your next mug, bottle, or food jar!

66 thoughts on “Design Explained – Our SlickSteel® Interiors and Nonstick Coatings

  1. I am considering the purchase of your new maestro breadmaker, but am not happy about the non stick pan. Do you offer a pan made with stainless steel or other non toxic material.

      • I have one of the BB-PAC20 breadmakers and the Teflon smell is awful. every time you turn the machine on the room fills with the smell of burnt plastic. it’s unusable. I wish this company would recognize that there are insurmountable challenges to making PTFE safe for food contact and heating.

        • Hi Ty! New machines may have a resinous smell, such as that of plastic, but the odor will lessen as you use the product. Please let us know if you continue to encounter this smell through use. The baking pan has a non-stick coating containing PTFE- a material commonly used for non-stick coating in cookware for conventional kitchen use (FDA approved). If you need further assistance, please contact our customer service team at 1-800-733-6270 or email

      • I have been in the market for a breadmaker forever, and I’m holding out for a pan made without a nonstick coating–for example, one make with your SlickSteel would be something that would interest me. Many other consumers are waiting for teflon-esque free breadmakers. Please invent this!

    • I have zoirushi bottles that have the cancer warning on the box. What part of the bottle is made of that material and what is it I really like it but I am concerned. I have the 200ml lavender flask and the 360 ml flip top.

    • Hi Kathy,

      All of our water boiler liners are made of stainless steel with nonstick coating made of PTFE. It is a fluoropolymer, a material commonly used for nonstick coating in cookware for conventional kitchen use.

      As long as the product is used under normal circumstances, it should not pose any problems.

      All product materials used for our products are materials that are approved by the FDA for food and beverage contact.

      Please contact your nearest authorized service center if you would like to receive an estimate to replace the water boiler liner:

  2. I have a stainless steel mug SM-Sd60-RC. I noticed the interior of the mug is coated and not in steel finish. Is the coating toxic and contains PTFE OR PFOA?

  3. I have a NS-KCC05 I bought 7 years ago as used which had the bowl already scratched. The scratches catch nylon shamoji and damage it then the shamoji damages the scratched coating more and more. Despite being careful and removing the damage from the shamoji the scratches are becoming larger chips. The bowl is no longer available anywhere.

    But I would like to make a suggestion, or perhaps request, for the harder non-stick ceramic coatings. I would not mind paying more. And then I do not need to worry so much about the coating being damaged. Thanks.

  4. Hi, my food jar with slicksteel interior has been scratched by stainless steel spoon. Is it still safe to use? Thank you.

  5. I have SM-LA60AD mug. I have recently noticed that this coating has come off my mug and is now floating on top of my drink. I don’t think it is safe, and even if is safe to consume this coating, I don’t feel very comfortable. Will I be able to receive a refund or exchange of product somehow? Thanks.

  6. Great blog article, looking forward to see a SlickSteel or something similar in your rice cookers. I have no interest in PTFE coating, aluminum pot, fluorine platinum powder coating or any such similar products. It’s nice to see that finally Zojirushi is working on new non aluminum material like SlickSteel. As soon as it is available in the rice cookers we most likely be some of the first ones to get it.

  7. Hello, I have tried to find info about the nonstick coatings on your rice cookers but I don’t see any details. Can you please offer specifics on the product pages? Thanks!

  8. I have bought Zojirushi Stainless Mug SM-SD60 around a one and half year and found out that the nonstick interior become rough which i never use any detergent to wash it before. Would like to know the possibility of the caused ?

  9. Can i know if i can order a replacement part and have it picked up locally in singapore? the singapore website forms are not getting replied, so i think it seems like i need to spend on a whole rice cooker instead when the pan coating is flaking.
    can you let me know if you can arrange for an overseas PO ?

    • Hi Lincoln, unfortunately we cannot send parts overseas, as the product safety and design requirements are different for each country, and the products and parts we have here are only for the US (and Canada). I will see if I can have somebody contact you directly by e-mail.

  10. Please make an uncoated stainless steel rice cooker pot that I could use to replace my current pot. I don’t want to use PTFE-based products anymore and am considering no longer using my rice cooker because of it. I love my rice cooker, and I would hate to get rid of it. I think many more people would consider buying your products if this were an option, even if it took a bit more effort to clean.

    • Hi Emil, the nonstick coating is made of PTFE and it is PFOA free. The nonstick coating is a fluoropolymer, a material commonly used for nonstick coating in cookware for conventional kitchen use.

      As part of the approval process, the FDA considers the amount of a substance expected to migrate into food and the toxicological risks associated with that substance. FDA standard testing methods found no detectable levels of PFOA in any of our products.

      Please let us know if you have any other questions, thank you!

  11. Hi
    I have read the info about slick steel. So how does slick steel compare to the stainless steel interior that has bren used in Thermos sold in America fir the last few years. I purchased a 16oz thermos in New York in 2015 and it has stainless steel inside.

  12. I have a 34 oz. Tuff Sports Vacuum Bottle SJ-SDE10XA (with non-stick coating) which I bought years ago. Can you please tell me if the coating on these older bottles was made with PFOA, or if it was PTFE. Thank you!

    Also, I no longer want to use non-stick coatings/PTFE. All the larger bottles I see on your site have non-stick coating. The closest similar option to the Tuff Sports bottle—with the same type of lid, but with SlickSteel—seems to be the SV-GWE50…but it is only 17 oz., which is HALF the size of my current bottle. Am I missing something, or do you make a larger size of this bottle with SlickSteel? Please let me know the best option to replace the bottle I have, except with SlickSteel.

    Lastly, if you don’t make larger bottles with SlickSteel, I’d strongly urge your product team to do so.


  13. Can you make a rice cooker with an inner pot made of ceramic it clay instead? I’ll just sleep better knowing I’m not using Teflon. Thanks

      • Your 400 dollar multicooker is the only option for people who don’t want to buy something which is potentially toxic to the consumer and well known to be toxic to the environments local to the production? How generous of you. You people make the best rice cookers on the market, and you can afford to be more responsible and give us better, more ethical options.

  14. I purchased a rice cooker (NP-HCC10 Model) in April 2019. It is still less than a year old. I have already noticed there are 3 spots (each size about a sesame seed) that already have the coating coming off. I phoned the company and they said it is not under warranty. I am super disappointed about their product quality. I also concerned about the coating material toxin level since it comes off so quick and so easy.

  15. I am looking for a replacement pan for my Zojirushi rice cooker. I have been very happy with it but the lack of a stainless steel pan will force me to another brand. I no longer will buy anything with a coated finish.

  16. Just adding my vote against Teflon PTFE etc. was looking for a Teflon free rice cooker, alas. Teflon and Dupont so terrifying — ever since I read the 2015 three-part series in the Intercept about the Teflon Toxin and saw the Dark Waters film I am terrified of it all. I am angry that these chemicals are now in the blood of 99% on people on Earth and that they will never fully break down. The fumes also kill birds. We should not be eating out of or cooking with Teflon or PTFE containers.

  17. I’m currently in the market for a rice cooker & feel unsafe using a nonstick bowl. After searching Amazon & Zojirushi websites many hours over a few months for a Zojirushi cooker with uncoated SS bowl, and considering other options, I’ll be buying an Instant Pot. Not the Instant Pot Zest rice cooker for $29, because that is coated as well, but the regular Instant Pot multicooker in the small size to use as a healthy stainless steel rice maker. I really wanted a zojirushi but I am buying NOW for a lasting solution, so I won’t be getting a Zojirushi for at least many years. People are willing to spend some time soaking off stuck-on rice if it means better health. Or maybe just run a short heating cycle with just water to clean it up faster. I’m SO disappointed in Zojirushi for seeing the trend away from unhealthy non-stick coatings that has been brewing for years, like we all have, & yet taking ZERO ACTION. You just don’t seem to want our business, do you! How dare you! You’ve stolen my dreams.

  18. I have a Zojirushi thermos. Model sm-khe48-xa. I think it was manufactured in 2013? The sticker on the bottom says BD131028. Would this have a slick steel coating or a PTFE coating? Thank you!

  19. I love my Zojirushi rice maker, and am looking for a new one, but I want to avoid PTFE and Teflon Coatings. Please consider making a rice maker with a SlickSteel inner pot! I am sure this will be very popular! Thank you!

  20. I have to add my vote as well, PLEASE make a non-chemically coated version of the cooking pan. I was about to order a nice new rice cooker finally when I realized it was non-stick coated. I just can’t.

  21. My Zojirushi rice cooking pot interior Teflon is in good shape but the pot’s exterior bottom has scratches from sitting In the sink.
    My question is, should I worry about these exterior scratches?

  22. My non stick coating is coming off my bread pan in my zojirushi Home Bakery BB-PDC30BA Virtuoso
    I have only used it a few times. Why would the coating be coming off? It is around the paddles also circular scratches where the paddles go around. I have only had the machine for less then a month. Maybe baked 5 loaves total.

  23. Dear Sir

    I would like to inquire where can I get the non stick inter pot for my zojirushi NS-WXQ18 from

    Thank you

  24. I purchased a Zojirushi Rice Cooker Model NS-TSC10 In the United States, PFOA was banned in 2014. Being that is an older model and that it was manufactured in China was this chemical eliminated from the cooking pot.

    • Hi Lisa, the nonstick coating is made of PTFE. It is a fluoropolymer, a material commonly used for non-stick coating in cookware for conventional kitchen use.

      As part of the approval process, the FDA considers the amount of a substance expected to migrate into food and the toxicological risks associated with that substance. FDA standard testing methods found no detectable levels of PFOA in any of our products so if any particles of nonstick coating were, in fact, accidentally swallowed there would still be no toxicological risk according to the FDA.

      Because this nonstick coating comes into contact with food or beverage, we carefully screen and select all materials we use. The nonstick coating used on our products may be safely used as components in food equipment and are safely designed to come into contact with food, in compliance with FDA regulation 21 CFR 177.1550 (perfluorocarbon resins).

      As a basic rule, the nonstick coating to be used on a product is tested before a new model is designed and manufactured.

      Please let us know if you have any other questions!

  25. are you ever going to stop using dangerous chemicals in your products… such a shame.. best name in the market but you can’t make a rice cooker without teflon… come on man get it together

  26. I just realized my awesome rice cooker from Zojirushi uses Non-Stick Coating. I have only used it a few times and love it but cannot use it any longer conscientiously due to the potential health risks. I agree with all the other comments about offering a non-stick coating option and a replacement pan for those who already purchased the Non-Stick version. I know it may seem trivial to many but the science is pretty well established and strong enough to pay heed and is very concerning. Please come up with a healthy solution for your awesome rice cooker, please!

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