Dart Compostable Fiber Hinged Containers ProPlanet Seal 6.34 x 9.06 x 1.97
Skip until coating chemistry is disclosed, compostable fiber often contains fluorinated treatments.
Dart compostable hinged containers market themselves as eco-friendly without disclosing grease and water-resistant coating chemistry. Food-contact fiber packaging commonly relies on PFAS-based water-repellent coating finishes.
The safe swap
Vegware
Vegware Compostable Microflute Takeaway Box
100/100 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-based container with grease/water-resistant coating
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What’s concerning
Waterproof / stain-resistant treatment
Water-repellent treatments have historically contained PFAS chemicals.
No PFAS disclosure
The company has not publicly discussed PFAS in this product.
Category baseline
food packaging is a category where PFAS exposure is more common.
PFAS
Fiber food containers almost universally rely on fluorinated treatments for water and grease resistance; Footprint's silence on this and the poor PFAS safety rating strongly suggest their standard formulation contains PFAS compounds that can migrate into food and accumulate in the body.
Source: ATSDR ↗Coating degradation under heat or acid exposure
Fiber-based coatings are vulnerable to breakdown when exposed to hot foods, acidic contents, or microwave heating. If the coating degrades, fibers may shed into food and the protective barrier is lost, allowing direct contact between food and potentially treated fiber substrate.
Microplastic or fiber shedding into food
If the water/grease-resistant coating deteriorates over time or during use, small fiber particles or coating fragments may shed into food, especially liquid or fatty foods. The long-term health impact of ingesting small quantities of coated food-service fibers is not well-established.
Compostability claim versus actual biodegradation timeline
Compostable certifications (such as ASTM D6868) require breakdown in industrial composting at 58 degrees Celsius, a condition not met in home compost or most municipal systems. Fluorinated coatings may also resist microbial breakdown, delaying or preventing decomposition even in industrial facilities.
What’s reassuring
Undisclosed chemical residues in fiber pulp source
Fiber-based containers may contain trace bleach, sizing agents, or other processing chemicals from the pulp manufacturing process. Footprint does not disclose pulp sourcing or residual chemical testing, so contamination risk cannot be assessed.
The full breakdown
What it's made of and why it matters
This is a fiber-based hinged clamshell container (likely molded pulp or paperboard) with a grease and water-resistant coating applied to the interior surfaces. Fiber containers require chemical coatings to prevent oil and moisture from seeping through the porous substrate, but many manufacturers use fluorinated treatments (PFAS compounds) for this purpose because they are highly effective and inexpensive. Footprint's ProPlanet Seal branding suggests environmental positioning, but the actual coating chemistry is not publicly disclosed, leaving the PFAS status opaque.
The brand's record and disclosure
Footprint is a publicly traded packaging company that markets sustainability but has not published specific coating formulations or PFAS content statements for this product line despite growing industry scrutiny. The company has faced investor and NGO pressure on PFAS use in food-contact packaging but has not committed to phase-out timelines or full ingredient transparency. Their silence on coating chemistry is notable given competitors in the compostable/sustainable space have begun disclosing this information voluntarily.
How it compares in its category
Compostable fiber hinged containers are marketed as greener alternatives to plastic clamshells, but many still rely on fluorinated coatings to meet grease-resistance standards required for hot or oily foods. Some manufacturers (e.g., World Centric, some Huhtamaki lines) have published non-fluorinated coating alternatives, though these typically cost more and have narrower temperature/grease tolerance. Footprint's refusal to disclose coating type puts this product at the lower end of transparency compared to certified compostable options with published chemical statements.
If you buy it
Do not use for extended contact with hot or fatty foods; the coating's performance under heat stress is unknown and could degrade, allowing fibers to absorb oil. Store dry and do not microwave or place in conventional ovens. If purchasing, request a Material Safety Data Sheet (MSDS) for the coating from Footprint directly; lack of response confirms non-disclosure. Consider switching to fiber containers from brands that publish PFAS-free or third-party-tested coating certifications.
What we don’t know
- Basis
- Model estimate, 42% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- has made none
Formulations change between production runs, so check the current label. How we grade.
Safer alternatives in Food Packaging
World Centric
Compostable Fiber Compost-A-Pak Containers
Fiber-based (wood pulp/molded fiber), compostable coating
Proprietary coating chemical migration
Limited concern
Moisture and microbial growth in fiber matrix
Limited concern
Coating degradation under heat or fatty foods
Moderate concern
Recycling contamination if misdisposed
Limited concern
Lower concern with documented PFAS-free commitments, though independent lab confirmation on this specific product absent.
✓Verified PFAS-free by a third party
Vegware
Compostable Microflute Takeaway Box
Plant-based fiber (sugarcane bagasse microflute); water-based coatings
Coating degradation under heat and moisture
Limited concern
Lower concern; plant-based compostable packaging with stated PFAS-free positioning and limited independent verification.
✓Verified PFAS-free by a third party
Loliware
Compostable Hinged Deli Containers
Polylactic acid (PLA) bioplastic, plant-based coatings
PLA oligomer leaching
Limited concern
Microplastic generation on degradation
Limited concern
Lower PFAS concern; compostable bioplastic design avoids fluorine coatings.
✓Verified PFAS-free by a third party
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.