Last reviewed: August 12, 2026
Food-contact suitability for custom polyethylene packaging cannot be established by a general “food-grade,” “FDA-approved” or “FDA-certified” claim. The regulatory status of the exact resin, additives, colorants, inks, adhesives, closures and other components must be evaluated for their intended use.
This guide explains how 21 CFR 177.1520 may apply to olefin polymers used in food-contact packaging and how buyers should interpret supplier declarations and laboratory reports. It does not certify every Flexon Pack product or every custom PE construction as compliant with US food-contact requirements.
What 21 CFR 177.1520 Covers
Title 21 CFR 177.1520 addresses specified olefin polymers that may be safely used as articles or components of articles intended for use in contact with food, subject to the identities, specifications, extractive limitations and conditions stated in the regulation.
Official regulation: 21 CFR 177.1520 — Olefin Polymers .
A reference to 21 CFR 177.1520 should identify the applicable polymer category and the evidence showing that the proposed material meets the relevant specifications and use limitations.
The Regulatory Status of Every Component Matters
FDA explains that the overall regulatory status of a food-contact material is determined by the regulatory status of the individual substances that make up the article and are reasonably expected to migrate to food under the intended use.
Depending on the construction, a review may need to include:
- Base polyethylene resin and polymer grade
- Processing aids, slip and anti-block additives
- Color masterbatch and pigments
- Printing inks and coatings
- Adhesives and pressure-sensitive closure systems
- Zipper profiles, sliders and labels
- Other substances expected to migrate under the intended use
Official FDA guidance: Determining the Regulatory Status of Components of a Food Contact Material .
Start with the Exact Resin Grade
The review should identify the resin manufacturer, resin grade and applicable supplier declaration. A declaration for one polyethylene grade should not be applied automatically to a different resin, blend, masterbatch or finished bag.
A resin declaration should be reviewed for:
- The legal name of the resin supplier
- The exact commercial grade and polymer description
- The applicable 21 CFR provision
- Specifications or limitations stated by the supplier
- Covered food types and conditions of use, where relevant
- The declaration date and document version
Virgin PE may be selected when required by the approved specification, but virgin-resin status alone does not establish the regulatory status of the complete finished package.
Food Type and Conditions of Use Must Be Defined
The intended use affects the regulatory assessment. Buyers should identify:
- The food type, including whether it is aqueous, acidic, fatty or alcoholic
- Direct or indirect food contact
- Contact duration
- Filling and storage temperature
- Refrigerated or frozen storage
- Whether the package will be reheated or used for cooking
- Whether repeated use is intended
Official FDA reference: Food Types and Conditions of Use for Food Contact Substances .
Evidence for unprinted film under one set of contact conditions should not be applied automatically to printed, colored, adhesive-closure or otherwise modified packaging used under different conditions.
How to Interpret Flexon Pack’s Public SGS Report
Flexon Pack publishes information about one company-held SGS report with the following identified scope:
- Applicant: Dongguan Chenghua Industrial Co., Ltd.
- Report number: CANHL25024319201
- Laboratory: SGS-CSTC Standards Technical Services Co., Ltd., Guangzhou Branch
- Sample: Biohazard specimen transport ziplock bag
- Report date: October 13, 2025
- Reported result: Pass for the selected density, extractable-fraction and soluble-fraction-in-xylene tests requested for the submitted sample
This is an SGS test report for the named sample. It is not an FDA-issued certificate, FDA approval of Flexon Pack or evidence that every Flexon Pack food bag, resin, additive, ink or finished construction is suitable for every food type and condition of use.
Review the current report and its limitations in the Compliance Evidence Center.
Supplier Declarations and Laboratory Reports Serve Different Purposes
A supplier declaration documents the supplier’s regulatory basis and the material or component it covers. A laboratory report records results for the submitted sample and selected methods. Neither should be interpreted beyond its stated scope.
A document review should confirm:
- Applicant, manufacturer or declaration issuer
- Exact material, component or finished sample
- Regulatory provision or authorization relied upon
- Test method, analytes and acceptance criteria
- Food types and conditions of use covered
- Report or declaration date
- Relationship to the proposed commercial specification
Thickness and Physical Performance Are Separate Questions
Film thickness affects weight, seal behavior and mechanical performance. It does not independently establish food-contact suitability, migration performance, shelf life or protection against spoilage.
Dimensional and thickness tolerances must be defined separately in the approved product specification. The permitted limits, measurement method, sampling plan and acceptance rule should be appropriate for the specific construction and order. They do not establish food-contact suitability, migration performance or compliance with 21 CFR 177.1520. Required seal strength, puncture resistance, barrier performance and migration evidence should be defined and evaluated separately.
PFAS Evidence Is Also Separate
A statement that PFAS is not intentionally added is a formulation and supply-chain statement. It is not equivalent to a laboratory conclusion that no targeted PFAS was detected above defined reporting limits.
Virgin polyethylene does not itself prove the absence of PFAS in the complete package. Any PFAS requirement should define the finished sample, substance scope, method, reporting limits, laboratory and destination market.
Minimum Evidence Package Before Approval
- Approved finished-product specification and version
- Exact resin grade and supplier declaration
- Documentation for relevant additives, colorants, inks and adhesives
- Closure and zipper-component documentation where applicable
- Defined food types and conditions of use
- Representative or order-specific laboratory report where required
- Production-lot identification where contractually required
- Written confirmation of document limitations and change-control rules
Flexon Pack’s Specification-Based Review
Flexon Pack is the international B2B packaging brand operated by Dongguan Chenghua Industrial Co., Ltd., incorporated in Dongguan in 2015. The manufacturing team’s PE packaging experience dates to 2012.
Flexon Pack can review a proposed material and construction and identify which currently available declarations or reports may be relevant. Availability and applicability are confirmed for the specific project. Additional evidence or testing may be required when the proposed specification differs from an existing documented sample.
Request a food-contact packaging evidence review.
Official References
- eCFR: 21 CFR 177.1520 — Olefin Polymers
- FDA: Determining the Regulatory Status of Food-Contact Material Components
- FDA: Food Types and Conditions of Use
- FDA: Inventory of Food-Contact Substances Listed in 21 CFR
This article provides general procurement and document-review information. It is not legal advice, an FDA approval, an FDA certificate or a declaration that every Flexon Pack product is suitable for food contact. The responsible business should confirm the current regulatory status of every relevant component and the intended conditions of use before placing the packaging on the US market.
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