Non-PP Parts Compliance: Gasket, Base & Glass Evidence

A polypropylene body that passes food-contact testing does not make the whole container compliant. Sourcing managers keep learning this the hard way: the listing passes review, then Amazon FBA or a customs broker asks for documentation on the other parts — the silicone gasket, the glass insert, the metal or composite base — and the file isn’t there. What looked like a compliance win turns into a suspension, a hold, or a chargeback.

The container you import is a multi-material system. Every part that touches food, or that sits between food and the outside world, carries its own regulatory basis. This buyer-guide walks through the non-PP components piece by piece — what standard applies, what the evidence should look like, and exactly which documents to demand from a factory before you commit to a mold and a PO.

Table of Contents

• Why the PP body alone is never enough

• The component-by-component non-PP compliance evidence map Silicone gaskets: know which rule actually applies

• Glass inserts: lead and cadmium release, not plastic migration

• Bases and alt-polymer parts: read the whole formulation

• The Declaration of Compliance for component assemblies

• What to demand from your factory: the six-part evidence file

• Must-haves vs red flags

• How to use these criteria in your next RFQ

• FAQ

Why the PP body alone is never enough

Food-contact compliance follows the substance, not the finished product name. An Amazon listing is granted based on the entire article, and marketplace food-contact guidance requires every component that contacts food to be documented. When your packaging or listing claims “food-grade,” “BPA-free,” or “leakproof,” the enforcer treats that claim as applying to every material in the build.

The practical consequence: a PP body tested under a single polymer rule does nothing for a silicone gasket that carries its own migration limits, a glass insert that must meet heavy-metal release thresholds, or a coated metal base that introduces a new surface chemistry. Each is a separate evaluation. A factory that hands over “the FDA report” with no component map has, in reality, handed you very little.

The component-by-component non-PP compliance evidence map

The core of a sourcing decision is a matrix: for each non-PP part, which standard governs it in the market you ship to, and what report proves it. The table below is the working version — treat it as the spine of your RFQ.

Component

US (FDA)

EU / UK (10/2011 + 1935/2004)

Germany (LFGB)

China (GB 4806 series)

Japan (Food Sanitation Act)

Silicone / rubber gasket

21 CFR 177.2600 (rubber, repeated use); extraction evidence

Silicone/rubber generally outside 10/2011; a plastic gasket layer in a closure is covered

§§30/31 + BfR Recommendation XV; migration, VOM, peroxide, sensory

GB 4806.11 (rubber)

Positive-list conformity + migration data for the exact compound

Glass insert / lid

Intended-contact substance + coating review; Pb/Cd release data

Council Directive 84/500/EEC (Pb/Cd); ISO 6486-1 method

Heavy-metal release + sensory

GB 4806.5 (Pb ≤1.5 mg/L, Cd ≤0.5 mg/L, small hollow articles)

Food-contact conformity for glass + decoration

Metal base

Alloy identification + coatings (e.g., 21 CFR 175.300 for coatings)

CoE metals guideline; substance-specific conformity

Metal composition + extractable heavy metals + sensory

GB 4806.9 (composition + heavy-metal migration)

Conformity file for alloy + surface treatment

Alt-polymer base (TPE/ABS/Tritan)

Component-specific basis; FCN/TOR if no CFR coverage

10/2011 — OML ≤10 mg/dm², SMLs per substance; DoC required

§30/31 + applicable BfR rec; migration + sensory

GB 4806.7 (plastics)

Positive-list conformity for resin + additives

Three nuances in that table are worth spelling out, because they trip up buyers who rely on a single “it’s certified” statement.

Silicone gaskets: know which rule actually applies

For gaskets and seals, the US route runs through FDA 21 CFR 177.2600, “Rubber articles intended for repeated use” . It lists the permitted ingredients and sets extraction limits for aqueous and fatty foods — for aqueous contact, total extractables must not exceed 20 mg per square inch after a 7-hour water reflux, then 1 mg per square inch in the following 2 hours. Compliance can rest on a formulation review plus extraction data; it is not a “certificate” in the EU sense.

In the EU, the Commission Regulation (EU) No 10/2011 on plastic food-contact materials draws a careful line. Silicone and rubber as such fall outside its scope. The exception that matters for containers: if a gasket in a cap or closure is a plastic layer or coating, that layer is within the Plastics Regulation. So you cannot assume a silicone seal is “EU 10/2011 certified” the way a plastic body is — the supplier should state the correct basis, and if the gasket is a plastic sealing layer, the 10/2011 route (with its overall and specific migration limits) applies to that layer.

For the German market a silicone gasket is typically assessed under LFGB §§30/31 with BfR Recommendation XV for silicones , covering overall migration, volatile organic matter, peroxide value, and sensory odor/taste transfer. On the China side, GB 4806.11 governs rubber. Japan expects a food-contact conformity package tied to the exact compound and intended use.

Glass inserts: lead and cadmium release, not plastic migration

Glass does not behave like a polymer, so applying a plastic-style overall-migration screen is the wrong mental model. The controlling risk for a glass insert or lid is the release of heavy metals from the glass body and any decoration. Under the China national standard GB 4806.5 (glass articles) , a small hollow article such as a food-container jar keeps lead release at or below 1.5 mg/L and cadmium at or below 0.5 mg/L, tested with the specified methods. In the EU, reusable glassware with lead-cadmium release falls under Council Directive 84/500/EEC and is tested by the ISO 6486-1 method, and any color decoration near the rim earns its own scrutiny.

Bases and alt-polymer parts: read the whole formulation

A metal or composite base brings its own chemistry — alloy composition, plating, coatings, and any liner. The evidence has to follow the surface that touches food. For a stainless or plated base bound for China, GB 4806.9 covers composition and heavy-metal migration; for the EU, the Council of Europe metals guideline and substance-specific conformity apply, and if a coating contacts food it needs its own authorisation. An alternative-polymer base such as TPE or Tritan reverts to the plastic route — under 10/2011 in the EU, with the overall migration limit of 10 mg/dm² and per-substance limits, plus a Declaration of Compliance.

The Declaration of Compliance for component assemblies

For plastic food-contact articles, the EU is explicit: a written Declaration of Compliance is mandatory at every marketing stage other than retail, including intermediate stages and the substances used to make them. Article 15 of Regulation (EU) No 10/2011 sets this out, and Annex IV specifies what the document must contain: the identity and address of the issuing operator and of the manufacturer or importer, a clear identification of the material, article, or component, the date, a statement of conformity with 10/2011 and Regulation (EC) No 1935/2004, and any restrictions on food type, temperature, or contact time. Where a gasket, base, or insert belongs to a plastic assembly, the DoC ties that component to its plastic authorisation.

The US has no single EU-style statutory form. Instead, the FDA’s component-framework guidance is built around establishing a regulatory basis for each component — its identity, specifications, and the limitations on its conditions of use. In practice buyers still receive a supplier Declaration of Compliance, but the value of that document depends on it being per-component and specific, not a blanket “complies with FDA” line.

What to demand from your factory: the six-part evidence file

When you qualify an OEM/ODM partner, ask for a full compliance file for the non-PP parts — the discipline many suppliers skip, and the reason most non-PP parts compliance reviews stall. A serious supplier should be able to produce all six pieces without hesitation:

• Bill of materials / component map. The exact gasket grade, glass type, base alloy or polymer, plus every additive, coating, ink, adhesive, and any recycled content. If a supplier cannot name each non-PP part, you cannot verify it.

• Supplier declarations. A statement from each raw-material vendor identifying the exact formulation and the intended food-contact use. This is where “food-grade” claims stop being conversational and become documented.

• Regulatory basis per component, per market. The specific 21 CFR section (or FCN/TOR), the 10/2011 route with limits, the LFGB/BfR basis, the GB 4806 sub-standard. A single global “certified” claim is a red flag; a market-by-market basis is the real thing.

• Test reports for the exact component. Not a “similar” material or an unverified PDF. The report should name the accredited lab, cite the method, show a sample ID that matches your SKU, carry a date, and state pass/fail.

• Traceability. Evidence linking the tested samples to the actual shipped lots — batch numbers, production dates, and records. This is what makes “will bulk match the sample?” answerable.

• Change control. Documents covering any change to formulation, supplier, curing system, coating, or process. A gasket that passed last year fails nothing this year if the vendor quietly switched from a platinum-cured to a peroxide-cured silicone.

If you want a ready-made template for requesting these tiers, our food container factory compliance documents guide breaks the full package into the mandatory US food-contact declarations, accredited third-party reports, and traceability files.

Must-haves vs red flags

Turn that list into a decision framework with a simple test: does the supplier hand you components-and-conditions-specific evidence, or a generic certificate?

Must-haves

• A named non-PP component map with grades and additives.

• A per-component regulatory basis that names the exact standard for your target market.

• Accredited-third-party test reports tied to the exact SKU and batch.

• A Declaration of Compliance that names the component and its use conditions.

• Traceability and change-control records that stay live across production runs.

• Claims (“food-grade,” “BPA-free,” “dishwasher-safe,” “leakproof”) matched to the test that supports them.

Red flags

• “It’s all FDA approved” with no component-level breakdown.

• A single consolidated report described as covering “the container” without per-part detail.

• A gasket or sealing material reference with no test of its own — this is the single most common gap.

• Glass components with no lead-cadmium release data.

• No traceability between the certificate and your PO.

• Any pushback when you ask for the original PDF rather than a screenshot.

A factory that treats non-PP compliance as a routine part of the file — rather than a request that needs escalation — is the one worth shortlisting. That is the standard we hold at Xinghui Plastic Products : the same OEM/ODM food-storage line we run across FDA, SGS, and LFGB baselines treats gasket, base, and insert documentation as part of the standard deliverable, not an add-on.

How to use these criteria in your next RFQ

Add the component table from this guide to your RFQ as a blank matrix and ask the factory to fill in the standard, the report number, the lab, and the date for each non-PP part, per target market. If they name a standard that does not match the component (for example, an EU 10/2011 claim on a silicone gasket), probe it — the correct basis matters. Then pair each claim with the original third-party report and the traceability that links it to your lot. You will end up with a defensible file your brand, your importer, and the marketplace can all rely on. For a wider view of the certifications to weigh across categories, the 7 essential certifications for plastic food storage containers and our five-market compliance map are good complements to this component-level deep dive.

FAQ

Does a single FDA report cover the gasket and the glass insert too? Not reliably. FDA evaluates a food-contact material component by component. A PP-body-only report says nothing about a silicone gasket (21 CFR 177.2600) or a glass insert (lead-cadmium evaluation). Demand per-component evidence.

Is a silicone gasket “EU 10/2011 certified”? Usually not directly — silicone and rubber fall outside 10/2011’s scope. A plastic layer forming a gasket in a closure is inside it. Ask the supplier for the correct basis: 10/2011 for a plastic sealing layer, or the appropriate EU/national silicone or rubber route for a silicone seal.

What tests does a glass insert need? Lead and cadmium release, per GB 4806.5 in China and EU 84/500/EEC in the EU, using the ISO 6486-1 method. Plastic-style overall migration is the wrong test for glass.

What is a Declaration of Compliance and when is it required? Under EU 10/2011, a written DoC is mandatory at marketing stages other than retail and must meet Annex IV content. In the US there is no single statutory form, but a defensible per-component regulatory basis fulfils the same intent.

What is the most common compliance gap when importing multi-material containers? The silicone gasket. Buyers test (or inherit a claim about) the PP body, then miss the sealing material, which has its own migration and sensory requirements — and it is the part that leaks, stains, or carries odour in use.

Key Takeaway : Food-contact compliance is per component, per market. Before you commit to a mold, demand a six-part evidence file — component map, supplier declarations, per-component regulatory basis, exact-component test reports, traceability, and change control — and let the presence of that file separate a serious OEM/ODM partner from a “certified” hand-wave.