As a kashrus agency, Seal-K follows a strict interpretation of Kashrut (Jewish dietary law) in its certification of contemporary food production.
[5] Seal-K’s kosher certification operations grew from European hashgachah activities in the 1990s under Rabbi Bentzion Rabinovich, a long-time resident of Lugano, Switzerland, now of Jerusalem.
Rabbi Rabinovich’s kashrus teams supervised small factories manufacturing chocolate, margarine, and wine, mostly for local consumption, in addition to airline food and a few hotel kitchens.
Over time, the certification began to include up to 15 different hotel programs, such as summer, Passover and Sukkot retreats.
In the United States, Seal-K certifies institutional food services, including a daily on-campus kosher kitchen at Northwestern University in Evanston, Illinois.