Meaning
Federal regulations governing the composition of polymeric substances used as components of food-contact surfaces establish safety limits for high-temperature applications. The fda 21 cfr 177 1390 regulation specifies the permitted polymers, adjuvants, and extraction limits for materials used in laminate structures that are subjected to retort processing. This standard ensures that no harmful chemicals migrate from the packaging material into the food when the package is heated to high temperatures during sterilization.
It applies to laminates used for packaging soups, sauces, and infant formula, where the package must withstand temperatures above 250 degrees Fahrenheit. Understanding this regulation is essential for manufacturers of flexible packaging and adhesive formulators who supply the food-contact industry.
Material Selection
Resins designed for retort packaging must be formulated using only the substances listed in this regulation. Polyurethane adhesives and polyester resins must pass rigorous extraction testing using food simulants at high temperatures. If a material contains unauthorized additives or fails the extraction limits, it cannot be used for high-temperature food packaging.
Extraction Testing
Laboratory evaluations use solvents like distilled water, heptane, and ethyl alcohol to simulate different types of food. The packaging material is exposed to these solvents at specified temperatures and times, and the amount of extracted residue is measured. These tests ensure that the barrier and adhesive layers do not degrade and release harmful compounds during the retort process.
Compliance Consequence
Failing to meet these regulatory standards can lead to product recalls and legal action, as well as damage to the manufacturer’s reputation. Molders and converters must maintain detailed traceability records and certificates of compliance for every batch of resin and adhesive used in the manufacturing process. This documentation is a critical part of the quality assurance system for food-contact materials.
