Are there FDA‑compliant seal manufacturers for the food industry? | Insights by Polypac

Friday, October 31, 2025
Explore key considerations for sourcing FDA-compliant seals in the food industry, including regulatory requirements, material safety, and best practices for procurement.

Ensuring the safety and integrity of food products is paramount in the food industry. A critical component in this process is the use of FDA-compliant seals, which play a vital role in maintaining product quality and consumer trust.

In this article, we address common questions and provide essential insights for professionals in the seal manufacturing industry to consider when procuring seals for food packaging.

What Are FDA-Compliant Seals?

FDA-compliant seals are sealing materials and systems that meet the safety standards set by the U.S. Food and Drug Administration (FDA) for substances that come into contact with food. These seals must not impart harmful substances to the food and must maintain their integrity under normal storage and handling conditions.

Why Are FDA-Compliant Seals Important in the Food Industry?

The primary purpose of FDA-compliant seals is to prevent contamination and preserve the quality of food products. They act as barriers against microorganisms, moisture, and other external factors that could compromise food safety. Additionally, tamper-evident seals provide consumers with assurance that the product has not been altered or contaminated.

What Materials Are Used in FDA-Compliant Seals?

FDA-compliant seals are made from materials that are safe for food contact, such as certain plastics, foils, and papers. These materials must not migrate harmful substances into the food and should maintain their integrity throughout the product's shelf life. It's essential to select materials that are compatible with the specific food product and packaging conditions.

How Can Manufacturers Ensure Their Seals Are FDA-Compliant?

Manufacturers can ensure their seals are FDA-compliant by:

  • Conducting Migration Testing: To verify that no harmful substances migrate from the seal into the food.

  • Maintaining Documentation: Keeping records of material safety data sheets and compliance certifications.

  • Staying Updated: Regularly reviewing FDA regulations and guidelines to ensure ongoing compliance.

What Are the Regulatory Requirements for Food Packaging Seals?

The FDA regulates substances that come into contact with food under the Food, Drug, and Cosmetic Act. Manufacturers must ensure that all materials used in food packaging, including seals, are safe and do not adulterate the food. This includes adhering to specific guidelines for materials, labeling, and testing.

How Do Tamper-Evident Seals Enhance Food Safety?

Tamper-evident seals are designed to show visible signs if a package has been opened or altered. This feature helps prevent contamination and assures consumers of the product's safety. The FDA provides guidelines on tamper-resistant packaging to ensure these seals are effective and reliable.

What Are the Best Practices for Procuring FDA-Compliant Seals?

When procuring FDA-compliant seals, consider the following best practices:

  • Supplier Verification: Ensure that suppliers provide documentation of FDA compliance and material safety.

  • Quality Assurance: Implement quality control measures to test seal integrity and performance.

  • Regulatory Updates: Stay informed about changes in FDA regulations to maintain compliance.

How Does Polypac Ensure FDA Compliance in Its Seals?

Polypac is committed to providing FDA-compliant seals by:

  • Utilizing Approved Materials: Selecting materials that meet FDA safety standards for food contact.

  • Conducting Rigorous Testing: Performing migration and integrity tests to ensure seal safety and effectiveness.

  • Maintaining Transparency: Providing clients with comprehensive documentation and certifications of compliance.

By adhering to these practices, Polypac ensures that its seals contribute to the safety and quality of food products, fostering trust and reliability in the food industry.

In conclusion, selecting FDA-compliant seals is crucial for maintaining food safety and consumer confidence. Manufacturers should prioritize compliance, quality assurance, and supplier reliability when procuring seals for food packaging.

By partnering with reputable suppliers like Polypac, businesses can ensure their products meet the highest standards of safety and quality.

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  • FDA Food Ingredients & Packaging

  • FDA Packaging & Food Contact Substances

  • FDA Food Ingredient & Packaging Terms

  • FDA Phthalates in Food Packaging and Food Contact Applications

  • FDA Procedures for Aseptic Processing and Packaging for the Food Industry

  • FDA Tamper-Resistant Packaging Requirements for Certain Over-the-Counter Human Drug Products

  • FDA Food Labeling Guide

  • FDA Procedures for Standardization of Retail Food Safety Officers

  • FDA Food Labeling Guide

By adhering to these practices, Polypac ensures that its seals contribute to the safety and quality of food products, fostering trust and reliability in the food industry.

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FAQ
Products
What is the difference between NBR and FKM materials?
NBR (Nitrile/Buna-N): A general-purpose, cost-effective material with excellent resistance to petroleum-based oils and fuels. It has a standard temperature range of -30°C to +100°C (-22°F to +212°F). FKM (Fluoroelastomer/Viton®): A premium material with excellent resistance to high temperatures (up to 200°C+), chemicals, and oils. It is used in more severe environments but is more expensive than NBR.
How important is surface finish on the metal parts that contact the seal?
Extremely important. A rough surface will abrade and wear out the seal quickly, causing leaks. A finish that is too smooth can prevent a lubricating film from forming. A typical recommended surface finish for dynamic applications is 0.2 to 0.8 μm (8-32 μin) Ra.
How can I prevent seal damage during installation?
Use Tools: Always use dedicated installation tools (e.g., picks, cones, guides). Lubricate: Always lubricate the seal and the contact surface. Protect Sharp Edges: Cover sharp threads and edges with tape or use an installation sleeve. Check the Groove: Ensure the installation groove is clean, deburred, and undamaged.
Can I reuse a seal?
We strongly recommend never reusing seals. Once compressed and used, a seal takes a "set" and its elastic properties are degraded. Reusing it almost always results in a leak. Always install a new seal during any maintenance or repair.
How do I choose the right material for my sealing application?
Material selection depends on four key factors: Media: What fluid or gas will the seal contact? (e.g., petroleum oil, water, chemicals, steam) Temperature: What is the minimum and maximum operating temperature? Pressure: What is the system's operating pressure? Are there pressure spikes? Application: Is it a static, dynamic, or rotary seal? Example: NBR (Buna-N) is excellent for standard hydraulic oil, while FKM (Viton®) is needed for high temperatures or aggressive chemicals.
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