Two alternatives that are often confused
Buyers who want to move away from plain plastic usually meet two options in supplier catalogs. The first is the starch-based container, often called corn starch tableware, cream coloured and slightly matte. The second is molded fiber, including bagasse made from sugarcane residue, which is pressed from wet pulp into bowls, clamshells and plates. Both are sold with similar pictures and similar wording, and both are often described in ways the material cannot support. The comparison below starts with what each material actually is, because that decides how it performs and what can be said about it.
Starch-based containers: what the blend is
The partner plant literature the desk works from describes its range simply as corn starch, and files it under PP thermoforming. The desk therefore treats these items as starch blended with PP, with the ratio confirmed per spec. That matters: a starch-PP blend is still a plastic, behaves largely like a thermoformed PP part and is described as a blend with lower plastic content, not as biodegradable or compostable.
The reference range is broad. Round bowls run from 380 ml at 136x83x51 mm to 1,000 ml at 175x125x67 mm, with an 800 ml lidded bowl at 175x125x56 mm as the main reference. Rectangular boxes run from 500 to 1,000 ml, from 183x121x42 to 183x123x72 mm, and divided meal boxes with three, four or five compartments reach 950-1,400 ml on footprints in the 220-251 mm class. They pack 200-300 sets per carton. See starch-based food containers.
Strengths: the blend handles hot and wet food in a way close to PP, takes a snap lid, nests well and has a distinct look. Limits: it is not a plastic-free route, it cannot carry a compostable claim without a certificate for the exact item, and in the EU it is treated as plastic.
Molded fiber and bagasse: strengths and limits
Molded fiber containers are formed from plant pulp in heated molds. They are stiff, have a natural paper-like surface and handle dry and many hot foods well. Because the base material is fibre rather than a polymer, some molded fiber items can be certified compostable to EN 13432 or ASTM D6400, and where they are, that claim can be made with the certificate number.
The limits are grease, water and the chemistry used to resist them. Plain fibre absorbs oil and moisture, so grease and water resistance often come from additives or coatings. In the United States, California AB 1200 has banned intentionally added PFAS in plant fibre food packaging since 1 January 2023, with a 100 ppm total organic fluorine screening line, and at least 13 states restrict PFAS in food packaging; Vermont, Connecticut and Minnesota cover all food packaging materials. The desk has no partner plant reference model for molded fiber, so these items are sourced per project with a PFAS statement and test data per item. The molded fiber and bagasse note goes deeper.
Side by side
| Factor | Starch-based (starch and PP blend) | Molded fiber or bagasse |
|---|---|---|
| What it is | Corn starch blended with PP, ratio per spec | Plant pulp pressed in heated molds |
| Hot and wet food | Close to PP behaviour | Good for many hot foods; wet and oily food needs barrier |
| Lids | Snap lids in the same blend or PP | Fibre lids or separate PET or PP lids |
| Compostable claim | No, unless a named certificate covers the item | Only where certified to EN 13432 or ASTM D6400 |
| Main rule to watch | Plastic rules, EU SUPD treats it as plastic | US state PFAS laws, California AB 1200 |
| Partner reference | 800 ml bowl, 175x125x56 mm | Sourced per project |
What each can claim
Claims are where most problems start. Under the FTC Green Guides, 16 CFR 260.8, an unqualified degradable claim needs evidence that the item will completely break down within a reasonably short time after customary disposal; items that go to landfill and do not break down within a year make such a claim deceptive. Under 260.7, a compostable claim must be qualified where composting facilities are not available to a substantial majority of consumers. In practice that means a starch-PP blend is described as a starch and PP blend with lower plastic content, and molded fiber is described as compostable only where the item holds an EN 13432 or ASTM D6400 certificate, quoted with its number and qualified for facility access. See biodegradable claims and the Green Guides.
The EU question
Under the Single-Use Plastics Directive 2019/904, chemically modified natural polymers and bio-based plastics such as PLA count as plastic. A starch-PP blend is clearly in scope as a plastic product, which affects marking and reduction measures; single-use plastic plates and cutlery are banned outright. Unmodified natural fibre products sit differently, but coatings and linings can bring them back into scope. EU buyers should confirm the classification of each item with counsel before launch.
Testing both on the same menu
The fairest way to compare the two is to fill samples with the real menu. The desk agrees a short plan per order: hot fill with the hottest dish, a tilt and inversion check with sauce or soup, a hold test in a closed delivery bag to see how each wall handles steam and oil, and stacking in the bag. For the starch-PP blend, add a freezer check and a microwave test where the supplier marks it. For molded fiber, add a grease hold-out check on the inside face and a PFAS screening report for US states. Migration tests run at a third-party lab against the target market. Results are recorded against the sample so the bulk order can be checked to the same standard; see testing and inspection.
How to choose
- Decide the claim the brand wants to make and check whether any material can support it with a certificate.
- For hot, wet and saucy food with a snap lid and no compostable claim, the starch-PP blend is the practical choice.
- For a certified compostable message, choose molded fiber items that hold the certificate and a PFAS statement for US states.
- Run a hot fill and grease test on samples of both.
- Check quantities: stock items typically start from 1-10 mixed cartons, confirmed in writing; see MOQ and lead time.
Send the menu, target market and the claim you want to make through the quote form. The desk returns matched items with the material of each part and the documents each claim needs.