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!

10 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

    • 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.

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