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Products · Food storage & kitchen · WECK

WECK Mold Jars, 1/2 L (set of 6)

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WECK Mold Jars, 1/2 L (set of 6)

Glass jars with glass lids and natural rubber rings, about $4 a jar. Lead Safe Mama's screening found lead in WECK glass in 2014 and 2019, and WECK has published no migration test. The rings are sold separately.

Best for Fridge and pantry storage of dry goods, leftovers and sauces, without plastic touching the food, if you accept the open lead question below.

Our rating
Good (3.5 of 5)
Price range
Budget
Size
6 jars (19.6 fl oz each), 6 glass lids, 6 rubber rings, 12 clamps
Made in
Germany

approx. $25

See it on WECK’s site → (opens in a new tab)

We are not affiliated with WECK. This link goes to the maker’s own page, with no tracking code. How we're funded.

Also sold at Williams Sonoma ($44.95), Crate & Barrel ($53.70) .

Reader ratings & reviews

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    Reviews are personal experiences, not research, and they never change our quality ratings. Every review is read by our team before it appears.

    How we evaluated it

    How it scores Our rating, metric by metric Good, 3.5 of 5
    1. What touches the food 45% of the rating 4 of 5

      Food touches glass, a glass lid and a natural rubber ring; the steel clamps stay outside. The rubber's additives are not named.

    2. Independent testing 15% of the rating 1 of 5

      The only independent tests we found, Lead Safe Mama's XRF screens, read 107 to 159 ppm lead in the glass and lid. WECK publishes no lead or migration test.

    3. Durability 15% of the rating 4 of 5

      Glass lasts decades and rings ($2.10 to $3.00 a bag of 6) and clamps are sold separately. The rings wear out and no warranty is stated.

    4. Trust 10% of the rating 2 of 5

      By the tester's account WECK has known of the lead readings since 2014 to 2015. It answers buyers by email but has published no lead or migration data, and buyers were still asking in October 2026.

    5. Value 15% of the rating 5 of 5

      About $4 a jar with lid and ring, the lowest price per container of anything we list.

    The rating, 3.5 of 5, is the weighted average of these scores. See how we rank food storage & kitchen and our standard.

    Where to buy Stores and the prices we saw 2 stores
    • Williams Sonoma (opens in a new tab) approx. $44.95. Listed as the Weck Mold Jar, 19.6 oz, Set of 6, with 6 jars, 6 lids, 6 rubber rings and 12 clamps, the same set. $44.95, nearly twice WECK’s $25. Opened 2026-11-03.
    • Crate & Barrel (opens in a new tab) approx. $53.70. Listed as the Weck 19.6-Oz. Glass Canning Jar, Set of 6, with 6 jars, 6 lids, 6 rings and 12 clamps, made in Germany. $53.70, more than twice WECK’s $25. Free shipping. Opened 2026-11-03.

    Prices as we saw them on October 23, 2026. They change often. These links carry no tracking code and earn us nothing.

    What it’s made of What touches your food, water, skin or air 3 materials
    1. Soda-lime glass jars and glass lids (about 70% quartz sand, 10% lime and 13% soda by the maker's recipe, with recycled glass as the largest part of the batch)
    2. Natural rubber sealing rings
    3. Metal clamps: stainless steel 301 according to Lead Safe Mama's XRF reading; WECK does not state the metal
    Who tested it What each test found, and who paid for it 2 tests
    • Independent Lead Safe Mama (XRF screening; the site earns affiliate income from some product links) November 2019

      A recent small WECK jar with a glass lid read 120 to 159 ppm lead in the glass (four readings) and 107 ppm in the lid; cadmium, arsenic and mercury were not detected in the glass, lid or rubber ring. The author calls it the highest-lead reusable baby-food jar she has found, and says new jars WECK sent her from its factory in 2015 all read in the same range. XRF measures total lead in the material, not what moves into food, and she judges leaching likely to be low. Open ↗ (opens in a new tab)

    • Independent Lead Safe Mama (XRF screening; the site earns affiliate income from some product links) November 2017

      A WECK canning jar from 2014 read 142 ppm lead. The author says that is far below leaded crystal but she would not store fermented or pickled food in it, and asks readers to request WECK's leach-test results. Open ↗ (opens in a new tab)

    Who paid, and why it matters
    • Independent The tester took no money from the maker for it: a consumer group, a journalist, a university or a regulator.
    • Paid certification An outside lab or certifier tested or listed it, and the maker paid for that.
    • Maker’s own test A lab report or certificate of analysis the maker commissioned and published.

    A certification is a floor, not a verdict: it checks what its program checks and nothing else. We weigh tests by someone with no stake in the result most.

    What people ask Worries raised online and elsewhere, and what we found 4 questions
    Do WECK jars contain lead?
    Lead Safe Mama's XRF screens read 120 to 159 ppm in the glass and 107 ppm in the lid of a 2019 jar, and 142 ppm in a 2014 jar. She says the factory samples WECK sent her in 2015 read the same, and the rubber ring in the 2019 jar had no detectable lead or cadmium. For scale, she read 43 ppm in a Ball jar (opens in a new tab) and calls Ball the most consistently lead-free brand she has found; in her 2023 list (opens in a new tab) she tells readers who want strictly lead-free storage to avoid WECK. XRF shows total lead in the glass, not leaching, and she says leaching is likely low; her worry is long freezer storage of baby food and long fermenting. We found no newer test.
    Has anyone tested whether the lead leaches into food?
    WECK has posted no figures. Readers say it emails buyers that lead cannot be fully removed from the glass, that none can move into food, and that a German authority tests the glass mix and rings every year; one reader said the 2019 report it attached said only "pass" (comment (opens in a new tab)). Life Without Plastic, a seller, once wrote that a CPSIA-accredited lab found no lead in leach tests (2019 page copy (opens in a new tab)), and a jar blogger's vinegar test-strip check found none (2018 post (opens in a new tab)). We saw no lab report for any of these. A Reddit thread from October 2026 (opens in a new tab) asks the same question, and the one reply dismisses her work.
    What are the rubber rings made of, and do they last?
    WECK's rings page (opens in a new tab) says natural rubber, which stretches if it meets oil and which WECK says to hand wash and store dry. Additives are not named. They cost $2.10 to $3.00 a bag of 6, and clamps are sold in bags of 12.
    Is it freezer safe?
    WECK's US page says Mold jars are freezer safe when used with its plastic keep-fresh covers. Its German FAQ (opens in a new tab) also describes freezing jars with the ring, glass lid and clips. The plastic covers would bring plastic back over the food.
    Why we chose it What put it on our list 3 points
    • The food-contact parts are glass and natural rubber. WECK's FAQ describes its jars as soda-lime glass and the rings as natural rubber, and the lid is glass held on by two clamps.
    • The set is made in Germany according to the maker, and costs about $25 for six jars with lids, rings and clamps.
    • WECK says its jars are dishwasher and microwave safe, and sells rings and clamps separately.
    Trade-offs What to weigh before you buy 4 points
    • Independent XRF screening found lead in the glass: 107 to 159 ppm in jars from 2014 and 2019. WECK has not published a lead or migration test (buyers say it tells them privately that none moves into food), so we cannot tell how much, if any, reaches food.
    • The rings are a wear item. They are natural rubber, WECK advises hand washing, and oil on the rim makes them stretch. The pages we read give no lifespan.
    • Glass is heavy and can break, so these suit the fridge and pantry better than a lunch bag. WECK says the Mold jars are freezer safe only with its plastic covers.
    • WECK says recycled glass is now the largest part of its glass batch, and we found no published statement from it on lead, cadmium or BPA, only the email reply that buyers report.
    What to know Details worth knowing first

    Our guide to reducing microplastics says to store and reheat food in glass, ceramic or stainless steel rather than plastic. WECK jars are one of the few options where nothing plastic touches the food: a glass jar, a glass lid, a natural rubber ring and a metal clamp, at about $4 a jar.

    The open question is lead. Lead Safe Mama, an independent advocate who screens household goods with an X-ray analyzer, found 107 to 159 ppm lead in the glass and lids of WECK jars from 2014 and 2019, and says new jars from the factory read the same. That is lead in the glass, not lead in your food, and she judges leaching likely to be low. WECK has published no migration test. Buyers say it emails them that nothing moves into food and that a German authority checks the jars each year, and a seller once said a lab found no leachable lead, but we saw no report for either. We found no newer independent result.

    Until it does, we would use these for the fridge and pantry rather than for baby food, long ferments or acidic food stored for weeks, which are the cases that author worries about. The rings wear out, so buy a spare bag.

    What we checked Each claim, and how sure we are of it 6 checks
    How WECK Mold Jars, 1/2 L (set of 6) measures up against our food storage & kitchen criteria
    What we checked What we found
    Glass or steel where food touches Maker’s claim Soda-lime glass jars and glass lids, per WECK's FAQ. Lead in that glass is covered under the lead check below.
    Lids and seals you can name Maker’s claim Glass lids and natural rubber rings (WECK FAQ and rings page). The clamp metal is not stated; Lead Safe Mama's XRF identified stainless steel 301.
    Written heat limits Maker’s claim Dishwasher and microwave safe; freezer safe with plastic keep-fresh covers. No oven temperature is stated.
    Replaceable parts Maker’s claim Rubber rings are sold in bags of 6 for $2.10 to $3.00 and clamps in bags of 12 for $5.40. Care: hand wash rings, store dry and dark.
    Lead, cadmium and BPA Verified WECK makes no statement on its US pages and publishes no test. Lead Safe Mama's XRF screens found 107 to 159 ppm lead in WECK glass and lids in 2014 and 2019; cadmium was not detected in the 2019 jar. Buyers report a private WECK email saying no lead can migrate and that a German authority tests yearly; we saw no report.
    Recalls and notices Verified No CPSC recall and no Prop 65 notice names WECK (searched 2026-10-23).
    What the labels mean
    • Verified We opened an independent record that confirms it: a certifier’s listing, a regulator’s list or a lab report. It is linked under Sources.
    • Maker’s claim The maker says so on its own page or label. We read it but found no independent record.
    • Not verified We looked and could not confirm it, or the maker does not say. Treat it as unknown.
    Sources Where our facts come from 12 sources
    1. WECK 742 Mold Jar (set of 6) product page. Maker’s page. Price and contents read 2026-10-23. Open ↗ (opens in a new tab)
    2. WECK FAQ: glass composition and rings. Maker’s page. Open ↗ (opens in a new tab)
    3. WECK rubber rings (bag of 6). Maker’s page. Open ↗ (opens in a new tab)
    4. Lead Safe Mama: small newer WECK baby food canning jar with glass lid, XRF results (2019). Test report. XRF screening by an independent advocate; the site earns affiliate income from some product links. Total lead, not leaching. Open ↗ (opens in a new tab)
    5. Lead Safe Mama: 2014 WECK canning jar, 142 ppm lead. Test report. Open ↗ (opens in a new tab)
    6. Lead Safe Mama: Ball mason jar, 43 ppm lead (2017). Test report. Used for scale. In it she says Ball is the most consistently lead-free jar brand she has found and that WECK jars read in the 200 ppm range in her earlier tests. Open ↗ (opens in a new tab)
    7. Lead Safe Mama: Safer choices, baby food storage (2023). Test report. Her list of brands to avoid for strictly lead-free storage; WECK is on it. Open ↗ (opens in a new tab)
    8. Life Without Plastic: WECK 742 Mold Jar page, December 2019 (Internet Archive copy). Independent source. A seller's note that a CPSIA-accredited lab found no lead in leach tests. No report is shown, and Life Without Plastic's catalog no longer lists WECK (checked 2026-10-23). Open ↗ (opens in a new tab)
    9. All About Jars: Do Weck jars contain lead? (2018, Internet Archive copy). Independent source. A jar blog's overnight vinegar test-strip check, not a lab test; the site earns affiliate income. It also quotes the email WECK sends buyers. Open ↗ (opens in a new tab)
    10. Reddit r/Canning: Weck jars (October 2026). Independent source. A buyer asking whether WECK jars still test high for lead and finding nothing recent. Open ↗ (opens in a new tab)
    11. CPSC recall search for WECK, run 2026-10-23. Certifier or regulator listing. No recalls. Open ↗ (opens in a new tab)
    12. California Attorney General: Prop 65 60-day notice search. Certifier or regulator listing. Searched on 2026-10-23; nothing named WECK. Open ↗ (opens in a new tab)
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