Sourcing Japanese Cast Iron: A Buyer's Guide to Nambu Ironware Kettles, Teapots and Import Rules
- 堤浩記
- 2 days ago
- 13 min read
Japanese cast iron sells itself in a photograph. It is much harder to import well. Two products that look almost identical on a supplier's catalogue page can carry different HS codes, fall under different food-contact standards, and require completely different care instructions for your end customer.
This guide is written for importers, distributors and specialist retailers sourcing Nambu ironware — Nambu tekki in Japanese — and other Japanese cast iron. It covers what you are actually buying, how supply routes differ, the compliance work that sits with you as the importer, customs classification, and the landed-cost arithmetic that weight forces on this category.
Regulatory and classification information in this article was verified in August 2026. Standards are revised; confirm current requirements with primary sources and with your own customs authority before you order.
Start here: a kettle and a teapot are not the same product
This is the single distinction that determines almost everything downstream. Get it wrong and you will generate returns, complaints and possibly a customs correction.
Tetsubin: the bare iron kettle
A tetsubin has an unlined interior of bare cast iron. It is designed to sit on a heat source and boil water. It is not designed to hold brewed tea, and it will rust if water is left standing in it. Customers who own one need to know to empty it and dry it with residual heat after every use.
The enamel-lined teapot
What most Western retail listings call a "Japanese cast iron teapot" is a different object: the interior is lined with vitreous enamel. It is filled with hot water and used to steep and serve tea. Most manufacturers state that these are not for stovetop use. The enamel lining is what makes them practical for everyday tea service — and also what makes them vulnerable, because direct flame and abrasive cleaning damage the lining.
Why this matters beyond the product description
The two versions diverge in three ways that affect you as the importer:
Customs classification. Enamelled and non-enamelled cast iron kitchenware and tableware sit under different six-digit HS subheadings.
Food-contact compliance. In China, for example, bare iron falls under the metals standard while enamelled ware falls under the separate enamel (tangci) standard.
After-sales. Rust complaints come from bare iron; chipped-lining complaints come from enamel. They need different pre-sale messaging.
If you are listing both on the same website, use consistent terminology and make the intended use explicit in the product title, the description, the imagery and the insert in the box. In multilingual catalogues, "kettle" and "teapot" get swapped in translation more often than you would expect. Give your translators a glossary.
Where it comes from: two origins, one name
Morioka and Oshu are separate lineages
Nambu ironware is not the output of a single workshop town. Production in Morioka traces to the mid-17th century, when the Nambu clan brought kettle makers from Kyoto to produce tea-ceremony kettles. Production in Oshu, formerly Mizusawa, traces further back, to the late Heian period, when the Oshu Fujiwara clan brought casters from Omi to make Buddhist implements and iron pots.
The two districts unified under the name Nambu tekki in 1959, and the category was designated a national Traditional Craft by the Minister of International Trade and Industry (now the Minister of Economy, Trade and Industry) on 17 February 1975, in the first round of designations under Japan's Act on the Promotion of Traditional Craft Industries.
They remain separate cooperatives with different product emphases and different production scales. "We would like to buy Nambu ironware" is therefore not a specification. Name the district, the maker and the item, or your quotes and lead times will not be comparable.
There is no export statistic for Nambu ironware
If you are building a category case internally, do not expect to find trade data for this product. Japanese trade statistics are compiled by HS code, so Nambu kettles and pans are aggregated into headings that cover all cast iron kitchenware and tableware regardless of origin or maker. Regional production figures appear in industry-association and prefectural material, but the compiling bodies and definitions are not consistent enough for year-on-year comparison.
Assess the category on what is actually selling in your channel, not on a national export line that does not exist.
What you can actually buy
Four groups, each with a different price band, weight profile and compliance burden.
Kettles (tetsubin). Highest unit price, heaviest, and the item that most rewards a channel able to explain provenance and process. Freight is a smaller share of a high retail price, so these often work better on landed cost than buyers expect.
Enamel-lined teapots. The colour range and form make these easy to merchandise as tableware or as a design object rather than as a craft artefact.
Cookware. Sukiyaki pans, skillets, grill pans, takoyaki pans. Sold on what they cook, not on where they come from. This is the group that opens restaurant and foodservice accounts.
Interior and giftware. Wind bells, trivets, paperweights, bottle openers. Low unit price and useful as an entry point to the brand, but the freight-to-value ratio can be worse than on kettles.
A common mistake is to assume small items are the safe way to test a supplier. On a per-unit basis, a light object with a low retail price can carry a worse shipping ratio than a kettle. Build the arithmetic before you decide which group to open with.
Choosing a supply route
Buying direct from a foundry
You get the maker's name, a clearer provenance story and, sometimes, the possibility of exclusivity in your market. You may also get long lead times, limited English-language documentation, no consolidated shipping across makers, and no test reports on file for your destination market.
Buying through a wholesaler or trading company
You get consolidation across several makers in one shipment, export documentation handled as routine, and usually a faster answer on restocking. You give up some margin and, often, direct contact with the workshop.
What to get in writing before the first order
Minimum order quantity, stated twice: per SKU and per order. These are different numbers and suppliers often quote only one.
Lead time, stated twice: for a first order and for a repeat. Repeat lead times are usually materially shorter, and the difference decides whether you can hold shelf space.
Net weight and packed dimensions for every SKU. You cannot quote landed cost without these.
Packing specification, with photographs, and the maximum pallet stacking height.
Damage procedure: reporting deadline, photographic evidence required, and whether the remedy is replacement or credit.
Any existing distribution in your territory, before you raise exclusivity.
Food-contact compliance sits with you as the importer
Kettles, teapots and pans are food-contact articles in every market that regulates them. Cast iron is awkward because a single item can present three different materials to the regulator: the bare iron surface, the enamel layer and the colour pigment in that enamel. Japanese makers frequently hold no test data for your destination. Assume the testing is your cost unless the supplier proves otherwise.
European Union: framework Regulation 1935/2004 and the Council of Europe guide
There is no harmonised EU measure specific to metals and alloys in food contact, in the way Regulation 10/2011 covers plastics. What applies is Article 3 of Regulation (EC) No 1935/2004, the general safety requirement that materials must not transfer constituents to food in quantities that endanger health or unacceptably change the food's composition or organoleptic characteristics.
The reference document used to give that requirement concrete numbers is Council of Europe Resolution CM/Res(2020)9 together with the EDQM technical guide "Metals and alloys used in food contact materials and articles", whose second edition was published in 2024. The figures that matter for cast iron:
Iron (Fe): specific release limit of 40 mg/kg food
Lead (Pb), as a contaminant or impurity: 0.010 mg/kg food
Cadmium (Cd), as a contaminant or impurity: 0.005 mg/kg food
Second-edition changes include replacing the chromium SRL with one for trivalent chromium, adding zirconium at 2 mg/kg, and replacing DIN 10531 with EN 16889:2016 for artificial tap water in release testing
The guide is not binding EU law. It is the reference that member states use when applying Article 3, and in practice it functions as the pass mark for European retail and brand procurement. Note also that EDQM has stated the guide applies to enamel-coated cookware, and that because coating and substrate cannot easily be separated before testing, released metal is assessed without distinguishing which layer it came from. "The enamel covers the iron" is not an answer to a release question.
Some member states additionally maintain national rules on metallic food-contact materials. Check the specific destination, not "the EU".
Sources: Regulation (EC) No 1935/2004; Council of Europe Resolution CM/Res(2020)9; EDQM, "Metals and alloys used in food contact materials and articles", 2nd edition, 2024; EDQM published FAQ
United States: federal leach limits plus state disclosure law
Cookware does not require pre-market approval. The federal exposure is leachable heavy metals. FDA sets action levels for leachable lead from ceramicware, tested by acetic acid extraction, in Compliance Policy Guide Sec. 545.450, and ceramicware exceeding them may be treated as adulterated. Whether a vitreous enamel coating over a metal substrate sits squarely within that guidance is not settled, but the ceramicware figures are the reference point that buyers and testing laboratories work from. Coloured enamel is where this bites, because red, orange and yellow pigments have historically used cadmium and lead.
At state level, California's Proposition 65 imposes warning requirements for listed substances including lead and cadmium, and settlements over the years have established the leach figures that the trade treats as the working threshold for cookware.
The provision most often missed is California AB 1200, codified at Health & Safety Code sections 109000 to 109014. Where a chemical on the designated list maintained by the Department of Toxic Substances Control has been intentionally added to covered cookware, the following apply:
Disclosure on the manufacturer's website has been required since 1 January 2023.
Disclosure on the product label has been required since 1 January 2024.
"Cookware" is defined as durable houseware used to prepare, dispense or store food or beverages, with pots, pans, skillets, grills, baking sheets, baking molds, trays, bowls and cooking utensils given as examples in the statute
Items too small for a two-square-inch label and sold with no container, wrapper or tag are exempt from the physical label, but the information must still appear in online sales listings
The statute also restricts "free of" claims for a chemical where the product contains others in the same class
The California Attorney General has issued an enforcement advisory stating that failure to comply may constitute a violation of the state Unfair Competition Law. If you sell into the United States by direct e-commerce without state-level controls, treat this as in scope. Whether a tea kettle falls within the AB 1200 definition of cookware is a question of interpretation worth putting to US counsel before a first shipment.
Sources: FDA Compliance Policy Guide Sec. 545.450; California Health & Safety Code §§109000-109014 (AB 1200); California Attorney General, "Enforcement Advisory: Assembly Bill 1200"
China: two different national standards
Bare iron and enamel-lined ware are governed by different GB food safety standards.
Metal materials, including bare cast iron kettles and pans: GB 4806.9
Enamel (tangci) products, including enamel-lined teapots: GB 4806.3
The metals standard was revised as GB 4806.9-2023, issued in 2023 and in force from 6 September 2024, superseding the 2016 edition. The changes that matter here:
New limits on impurity elements — arsenic, cadmium, lead and mercury — in the food-contact metal substrate and in any plating layer
The number of heavy-metal elements subject to migration testing raised from five to thirteen
For articles intended for repeated use, migration testing is run three times; for metals other than stainless steel, a single exceedance across the three runs fails the article
Labelling requirements for substrate material type and composition, and for the structure of any plating layer
A cast iron kettle is precisely an article intended for repeated use, so the three-run rule applies directly. If China is a destination, commission the testing before you commit to a range.
Sources: National Health Commission and State Administration for Market Regulation Announcement No. 6 of 2023; GB 4806.9-2023; GB 4806.3-2016
Taiwan and other Asian markets
In Taiwan, food-contact utensils, containers and packaging fall under the Ministry of Health and Welfare's Sanitation Standards for Food Utensils, Containers and Packaging, with migration test items and limits set by material; for metals the focus is heavy-metal migration. Imports may be subject to border inspection, and Chinese-language labelling requirements apply.
Singapore, Thailand, Malaysia and other markets each set their own requirements. Do not treat "Asia" as one compliance regime.
"Adds dietary iron" is a health claim
Japanese suppliers routinely describe cast iron cookware as a way to increase iron in food, and the claim is used freely in the domestic market. Translated directly onto your product page or packaging, it may fall under nutrition and health claims rules — in the EU, Regulation (EC) No 1924/2006 — and may attract FDA attention in the United States depending on how it is framed.
Before you use it, establish whether the wording is an authorised claim in your market, whether you hold substantiating data, and whether a claim of that kind can attach to an article rather than to a food at all. If any of those is unclear, sell the thermal performance instead of the nutrition.
HS codes, duty and clearance
Classification for cast iron splits on two axes: what the article is for, and how its surface is finished. Two items from the same foundry can therefore sit under different codes.
Heading 73.23: kitchen and tableware, split by enamelling
Heading 73.23 covers table, kitchen and other household articles of iron or steel. The six-digit subheadings that matter:
7323.91 — of cast iron, not enamelled
7323.92 — of cast iron, enamelled
7323.93 — of stainless steel
7323.94 — of other iron or steel, enamelled (excluding cast iron)
7323.99 — other
A bare-iron kettle and an enamel-lined teapot therefore separate at six digits. If both appear on one invoice, they need separate lines. Note also that many bare-iron kettles carry an exterior coating or colouring; whether that constitutes "enamelled" turns on the actual finish, so do not assume that a coloured exterior means 7323.92.
Source: Japan Customs Tariff Schedule, Chapter 73, and the Explanatory Notes to heading 73.23
When heading 73.21 applies instead
Heading 73.21 covers non-electric domestic cooking appliances and plate warmers — stoves, ranges, grates, braziers, gas rings — with subheadings by fuel type. What belongs there is an appliance incorporating a heat source. A cast iron pan, skillet or grill pan with no integrated heat source generally falls in 73.23; the Explanatory Notes to that heading list frying pans, kettles, and gridirons and ovens other than those designed to incorporate heating elements among its examples of kitchen articles. Work from 73.23 first and only consider 73.21 where the article integrates the burner.
Wind bells and decorative items may leave Chapter 73
A wind bell, a small figure or a desk ornament may be classified as an ornamental article rather than a household one, which can move it to Chapter 83 — heading 83.06 covers bells, gongs and similar articles, and statuettes and other ornaments of base metal. Same foundry, same material, different chapter, because the use differs.
Get a binding ruling before volume shipments
Most major markets offer advance classification rulings — Binding Tariff Information in the EU, CBP rulings in the United States, and Japan's advance classification system on the export side. For a category where enamelling decides the code, a ruling is worth the effort. Submit interior and cross-section images, not just catalogue photography, because the finish is what the classifier needs to see.
Weight drives your landed cost
A kettle typically weighs one to two kilograms; a large pan weighs more. Against ceramics or lacquerware at a comparable retail price, freight takes a much larger share of the margin. Build the number before you build the range.
Work backwards from shelf price
Start from what a comparable product sells for in your channel. Deduct retail margin, your own margin, duty and VAT or sales tax, international freight and domestic delivery. What remains is the ex-works price you can pay. Then check whether any supplier can meet it.
Run this per group and the answer changes. High-value kettles usually survive it. Low-value small items frequently do not, because freight per unit does not fall in proportion to price.
Decide air versus sea before you quote
Cast iron is dense, so weight-rated services penalise it. In practice: samples and small top-ups by air or courier, main orders by sea, and two separate price lists so the arithmetic is visible. A quotation that says "freight quoted per order" stalls the buying decision, because neither side can model the margin.
Rust happens in transit
Bare iron in a sea container crossing the tropics is a corrosion problem. Packing that is adequate for Japanese domestic distribution may not survive the route. Ask for VCI paper or equivalent rust-inhibiting wrap, desiccant, a moisture barrier, and a stated stowage preference. Agree in advance who carries the cost of the rust-prevention specification, and how minor surface discolouration on arrival will be handled.
Packing and damage terms
Cast iron is heavy and it chips. On enamelled ware, a chip is a total loss of retail value. Fix the per-unit packing specification with photographs, set a maximum pallet stack, and write the damage procedure into the terms — reporting window, evidence required, replacement or credit. Doing this before the first order is what makes the second order straightforward.
Selling it after it lands
Lead with use, not heritage
"Four hundred years of tradition" is context, not a reason to buy. For a kettle, the reason is how it boils and how it ages. For a teapot, it is how it looks on the table and how it holds heat. For a pan, it is what it cooks. Provenance supports the price once the use case has landed; it rarely creates demand on its own.
Care information prevents returns
Bare iron and enamel need opposite handling. Publish both, in the local language, on the product page and in the box: how to dry a bare kettle, what not to use on an enamel lining, and what normal ageing looks like versus a genuine fault. Photographs work better than paragraphs here.
Rust is not a defect, but your customer does not know that
In Japan, "iron rusts" is common knowledge. To a first-time buyer in your market, light discolouration or spotting on arrival reads as a faulty product and produces a return and a one-star review. Setting the expectation before purchase is cheaper than handling it afterwards, and it protects the review score that carries the rest of the range.
Working with Link Global
Link Global is a Japan-based consultancy supporting overseas market development for Japanese manufacturers and craft producers, having supported more than 100 companies in over ten countries. Our representative director, Hiroki Tsutsumi, serves as an overseas expansion advisor to Japanese public bodies including the City of Kyoto and Fukuoka Prefecture's Global Connect Fukuoka.
For overseas buyers, we can help identify and approach producers in Iwate and other craft regions, clarify what a given workshop can realistically supply in terms of quantity, lead time and specification, and coordinate communication through to sampling and first order.
Related reading
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Sourcing Japanese Kitchen Knives: A Buyer's Guide to Regions, Steel and Import Rules
Selling Japanese Lacquerware & Ceramics Overseas: A Practical Export Guide
Six Key Points to Avoid Failure When Expanding Traditional Crafts Overseas
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