P-29, r. 1 - Regulation respecting food

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9.3.2.11. Freezing. Technique: Processed sea food products must be frozen by means of a technique that makes it possible to reduce the temperature, at the centre of a block of unpackaged fillets 25 mm in thickness to -21ºC in not more than 2 hours.
O.C. 1055-82, s. 14.