World Centric · Food Packaging
World Centric 8" x 8" x 3" Compostable Fiber Clamshells
Avoid until brand discloses coating chemistry, compostable packaging often relies on PFAS grease barriers.
These compostable clamshells are marketed as eco-friendly but lack public disclosure about the grease-resistant coating. Compostable food packaging frequently uses PFAS chemicals to repel oils and moisture.
The better-graded swap
World Centric
World Centric Compostable Fiber Compost-A-Pak Containers
95/100 safety
Same rubric that flunked this product. The swap earned Excellent.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
fiber pulp (compostable); grease-resistant coating unknown
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What World Centric 8" x 8" Fiber Clamshells is made of, ingredients and materials
World Centric's clamshells are molded fiber pulp, typically bleached and pressed into shape without plastic or synthetic polymer matrices. The structural material itself (plant cellulose) is inherently low-risk for chemical migration. However, the critical unknown is the grease-resistant coating applied to the interior surface. Compostable fiber containers almost universally use water- and oil-repellent coatings to prevent food from saturating the pulp, and many of these coatings historically relied on PFAS chemistry (particularly PFOA or GenX replacements). Without disclosed ingredient lists, the coating composition remains opaque.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Waterproof / stain-resistant treatment
Water-repellent coating treatments have historically used PFAS.
Unknown grease-barrier coating chemistry
Compostable fiber packaging typically requires water- and oil-repellent coatings; World Centric has not disclosed whether its coating is PFAS-based, PFAS-free, or an alternative chemistry. This is the primary non-PFAS safety concern for the product category.
Coating degradation under heat or prolonged contact
Compostable barrier coatings are engineered to break down in industrial compost, meaning they may degrade prematurely under microwave heat, hot food, or acidic conditions, potentially releasing particulates or coating residues.
Bacterial growth or mold if stored damp
Fiber pulp is hygroscopic and can retain moisture. Clamshells stored in humid conditions without drying between uses may develop mold or bacterial film, though this is a storage issue rather than a manufacturing chemical hazard.
What’s reassuring
Bleaching residues in fiber pulp
Compostable fiber containers are typically chlorine-free bleached (TCF, totally chlorine-free) or processed chlorine-free (PCF). No public recalls or health alerts exist for World Centric clamshells related to bleaching residues, and fiber-to-food migration from pulp itself is minimal.
Formaldehyde / VOCs
Molded fiber containers may use small amounts of adhesive or starch-based binders. World Centric products have not been flagged for formaldehyde emissions; fiber containers are not a known source of formaldehyde off-gassing in the way particle board or foam packaging can be.
Source, ATSDR ↗How is this PFAS grade calculated?
The brand's record and disclosure
World Centric markets itself as an eco-conscious, compostable-focused brand and holds BPI (Biodegradable Products Institute) certification for compostability. However, the company has not publicly disclosed the specific chemistry of its grease-barrier coatings or provided PFAS testing reports. Industry pressure on compostable packaging manufacturers to eliminate PFAS has grown since 2020, but World Centric's website and product documentation do not disclose PFAS content or coating composition. This silence is notable given that competitors (e.g., Footprint, some Huhtamaki lines) have begun publishing PFAS-free or reduced-PFAS claims.
How it compares in its category
Compostable fiber clamshells occupy a middle ground, they avoid the BPA and phthalate concerns of rigid polystyrene or polyethylene terephthalate (PET) containers, and they sidestep microplastic shedding from plastic wear. However, they do not automatically guarantee PFAS-free status. Many conventional wax-coated or silicone-coated food containers similarly lack transparent PFAS disclosure. Glass and stainless steel alternatives are not a material linked to PFAS but not compostable and require energy-intensive manufacturing. World Centric's product is typical in its lack of transparency; differentiation in the compostable segment now hinges on PFAS transparency, which this brand has not yet adopted.
If you buy it
Use these containers for dry or room-temperature foods whenever possible (baked goods, sandwiches, salads) rather than hot liquids or high-fat foods, which accelerate any potential coating migration. Do not microwave or expose to prolonged heat; compostable coatings may degrade unpredictably when heated. Store food in clamshells for brief periods only (under 4 hours) rather than as extended refrigerator storage. If PFAS exposure is a household priority, request product safety documentation from World Centric or consider switching to uncoated paper containers for dry items or glass for anything greasy.
What is not known about PFAS in this product?
- Basis
- Model estimate, 45% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- World Centric has made none
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to World Centric 8" x 8" x 3" Compostable Fiber Clamshells?
- Plant-based fiber pulp (compostable)
- A third party reports verifying it as PFAS-free
- Microbe/mold growth if stored damp
2 hazards checked on this product, all on its full breakdown.
Eco-Products
Eco Products WorldView Compostable Take-Out Containers EP-SCRC32
- Plant-based fiber (compostable sugarcane bagasse)
- A third party reports verifying it as PFAS-free
- Bleaching agents and processing residues
3 hazards checked on this product, all on its full breakdown.
Eco-Products
WorldView Sugarcane Take-Out Containers
- Sugarcane bagasse (post-consumer fiber)
- A third party reports verifying it as PFAS-free
- Cellulose fiber degradation and food contact
2 hazards checked on this product, all on its full breakdown.
More food packaging grades
How we score, every product runs through the same public 0-100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.