Letter that was sent to some kosher certifiers

 To the Rabbinic Leadership and Certification Standards Committee,

 I am writing to bring to your urgent attention a serious and largely unaddressed matter affecting the integrity of kosher wine certification — specifically as it pertains to Passover compliance.

For many years, a number of major cooperages, including some of the largest barrel manufacturers in the United States, have used wheat paste (a mixture of wheat flour and water) as a sealant in the croze groove where the barrel head meets the stave body. This practice introduces chametz directly into contact with wine that is subsequently certified as kosher.

I have firsthand knowledge of this practice from visits to cooperages, and I was personally involved in arranging for at least one major cooperage to switch to a kosher l’Pesach-compliant paste for barrels designated for kosher wine production. However, the problem extends well beyond any individual arrangement.

 A Critical Halachic Point: The K’zayis Threshold

I wish to draw your attention to a halachic dimension of this matter that has, to my knowledge, not been formally addressed by any major certifying agency.

The bead of wheat paste applied to the croze groove of a standard wine barrel is, by volume, almost certainly greater than a k’zayis — the minimum quantity of chametz that obligates complete destruction before Pesach. This is not, therefore, a matter of bitul b’shishim or trace contamination that might be dismissed as negligible. Each barrel contains a measurable, identifiable quantity of chametz that stands on its own as an object requiring biur chametz before Pesach.

The implications are significant:

—  Any winery holding barrels sealed with conventional wheat paste going into Pesach is potentially holding chametz that must be destroyed or sold before the chag.

—  Any wine aged in such a barrel — in sustained contact with a k’zayis or more of chametz over a period of months or years — cannot, in our view, be considered kosher l’Pesach, regardless of the certification it carries.

—  The standard kosher certification symbol does not communicate this distinction to consumers, leaving even the most observant families unable to make an informed decision at the point of purchase.

 Retroactive Record Review

Given the severity of this concern, we respectfully but firmly urge that this matter not be treated as prospective only. Wineries under your certification should be required to:

1.    Conduct a retroactive audit going back a meaningful number of years — we would suggest a minimum of five years, given typical barrel aging and reuse cycles — to identify which barrels were used in the production of certified kosher wines.

2.    Obtain documentation from their cooperage suppliers confirming the specific sealant used in each barrel, or class of barrels, supplied during that period.

3.    Identify any wines that were aged in barrels that cannot be confirmed as chametz-free, and flag those wines accordingly.

4.    Where those wines remain in inventory, in distribution, or on retail shelves, take steps to ensure they are marked and sold as “not for Passover use.”

This is admittedly a significant undertaking. It will require diligent cooperation between wineries, cooperages, and certifying bodies, and it may affect a substantial number of SKUs across many producers. Nevertheless, the halachic obligation is clear, and the integrity of kosher l’Pesach certification demands nothing less.

 

Forward-Looking Requirements

In addition to the retroactive review, we urge your organization to:

5.    Audit all cooperages currently supplying barrels to wineries under your certification, and require written disclosure of the sealant used in the croze groove of every barrel — including brand name, full ingredient composition, and any existing kosher certification of that material.

6.    Establish a formal written standard requiring that all barrels used in certified kosher wine production use only sealants that are kosher l’Pesach certified or that are entirely and verifiably free of chametz.

7.    Require wineries to maintain ongoing documented records of cooperage and sealant provenance for every barrel in use.

8.    Mandate clear Passover labeling. Any wine that cannot be affirmatively confirmed as having been produced using chametz-free sealants throughout its full barrel aging period must carry a clear, consumer-facing notation — “Not for Passover use” or equivalent — on its label or packaging.

9.    Issue public guidance making clear that “kosher” and “kosher l’Pesach” are not interchangeable designations for barrel-aged wines, and that the distinction is a matter of halachic substance, not mere marketing.

 

An Additional Concern: Gluten-Free Labeling

As a related matter, we note that some certified kosher wines make or imply gluten-free claims. No wine aged in a barrel sealed with wheat paste can responsibly carry such a claim without independent laboratory testing confirming gluten levels below the FDA threshold of 20 parts per million. We urge your organization to address this parallel consumer protection issue in conjunction with the Passover compliance standards above.

 

Conclusion

The consumers who are most likely to purchase and serve a premium, barrel-aged kosher wine at their Passover seder are precisely the consumers who are most stringent in their Passover observance. They rely on the integrity of your certification. The gap identified here is not theoretical — it is measurable, halachically significant, and has existed unaddressed for many years. The time to close it is now.

I am available to speak directly with your rabbinic and technical standards staff and to share additional detail about cooperage practices based on my own direct experience in the industry. I hope you will treat this matter with the full seriousness it deserves.

Respectfully submitted,

 

Rabbi Yehuda Shain

International Kosher Consultants

1140 Forest Ave, Lakewood, NJ 08701

1-732-363-7979

kashrusy@aol.com