Bagasse Meal Tray: A Sizing and Stacking Guide for Contract Caterers
Last spring a hospital group in Johor sent back three pallets. Bench test passed. QA signed off. On the ward trolleys, stacked nine high under a hot lamp for 70 minutes, the bottom layer bowed and two trays split at the corner rib. Nobody blamed the material. The tray had a 24 g base, 38 mm deep. The job wanted 31 g and a deeper skirt. Match the service line, trolley and dish. Miss one and you get returns.
We make these in Qingdao, roughly 2,500–3,000 tonnes a year, for caterers, hospitals, schools, airlines and central kitchens. Figures are directional; the drawing and a filled sample decide.
Five buyers, five different trays
“Meal tray” covers plenty of ground. Five buyers, five answers:
- Hospitals. Ward trolleys, warm-holding cabinets, 60–90 minute holds, texture-modified diets. Depth and base stiffness beat volume.
- Schools. High volume, tight budget, 20–30 minute lunches. Single-compartment rectangles win; kids carry them at an angle.
- Contract caterers. Three-compartment trays, plated in the kitchen, bussed back.
- Airline and rail. Depth under 35 mm, tight weight limits per drawer, a waste story to defend.
- Central kitchens. One tray for four brands, filled on a line, then chilled or blast-frozen under a sealer.
Identical on a spec sheet. Different failures in service.
Spec table: the tray sizes we press most
Outer dimensions at the rim; the inner cavity runs 10–14 mm smaller per axis. Weights are base plus wall, lid separate.
| Format | Outer | Depth | Weight | Capacity | Comp. | |||
|---|---|---|---|---|---|---|---|---|
| Temp | Pcs/box | Cartons/40HC | ||||||
| 5-comp | 320×260 | 29 mm | 25 g | ~750 ml | 5 | −20 to 110 °C | 200 | ~1,050 |
| 3-comp | 300×230 | 35 mm | 28 g | ~900 ml | 3 | −20 to 120 °C | 200 | ~1,000 |
| 3-comp deep | 300×230 | 45 mm | 31 g | ~1,150 ml | 3 | −20 to 120 °C | 150 | ~880 |
| Ward tray | 340×250 | 40 mm | 32 g | ~1,200 ml | 4 | −20 to 120 °C | 150 | ~850 |
| Airline | 240×180 | 26 mm | 20 g | ~520 ml | 2 | −20 to 110 °C | 400 | ~1,200 |
| Inset | 325×265 | 48 mm | 34 g | ~1,500 ml | 1 | −20 to 120 °C | 120 | ~780 |
Watch the last two columns. Shallow: 1,200 per 40HC. Deep inset: 780. Same freight bill, a third fewer units.
Depth, weight and the stack test that matters
Depth gets asked for first and understood least: 19 extra mm adds 2 g of pulp and eats 15% of your carton count.
Stack performance comes from the base radius and rib pattern, not wall thickness alone. Our working numbers:
- 4-high on a trolley, under 700 g of food: 24–27 g base is fine.
- 8-high in a warm cabinet at 65 °C for 90 minutes: 29 g minimum, ribbed base only.
- 12-high in a central-kitchen crate before blast chilling: 31 g and up, or a corrugated divider every sixth tray.
A Dutch caterer tried a 26 g base on a 45 mm tray to hit a price target. Six-high at 80 °C, the bottom trays took a set. They didn’t break; they leaned. The 30 g version cost 0.011 USD more per piece and ended the argument.
Microwave, warm-holding and the limits we won’t paper over
Bagasse tolerates a microwave. It hates a combi oven and a steam table.
- Microwave: 2–3 minutes at 800–1,000 W is routine. Past about 4 minutes on a dry tray, the rim dries and can scorch. Our trays are tested to a 120 °C surface peak — a peak, not a working temperature.
- Warm-holding: fine at 60–75 °C with humidity. Dry heat above 85 °C stiffens the rim.
- Combi ovens: no. Sustained heat above roughly 140 °C carbonises the pulp. An oven pass means CPET or aluminium, not us.
- Steam tables: a bad fit. Soggy base, and the tray softens exactly where the stack load sits.
And the loaded tray: bagasse is not a soup bowl. Gravy or anything above 200 ml of free liquid will wick through a seam in 15–20 minutes unless lined. A lined tray is a different SKU at a different price.
What a tray actually costs
Bagasse is not cheap per unit.
| Format | Price (FOB) | vs. PP | Freight* | Landed** |
|---|---|---|---|---|
| 5-comp | 0.085–0.11 USD | +40 to 60% | ~0.018 | ~0.11–0.14 |
| 3-comp | 0.10–0.13 USD | +60 to 80% | ~0.022 | ~0.13–0.17 |
| 3-comp deep | 0.13–0.17 USD | +80 to 110% | ~0.028 | ~0.17–0.21 |
| Ward | 0.16–0.21 USD | +90 to 120% | ~0.031 | ~0.21–0.26 |
| Airline | 0.07–0.09 USD | +35 to 55% | ~0.013 | ~0.09–0.11 |
\* Rough freight per piece at 2024–25 rates to a US or EU port; a 40HC ran 4,500–8,500 USD in that window.
\** Before duty and port fees. Confirm per SKU.
Tooling moves these more than negotiation. A bespoke 4-compartment tray needs a new mould, amortised into the first order: workable above roughly 100,000 pieces. Shaving 4 mm of depth can add 6–8% more pieces per box. A container of deep trays can hit the weight limit before the cube limit.
What we ask before quoting
Most buyers have three of these five ready.
- Hold time and temperature on the service line.
- Stack height, and what it stacks on — trolley, crate or sealer.
- Liquid content in the wettest dish.
- Compartment layout and the largest item that must fit one well.
- Certification clause: BPI, OK Compost HOME, EN 13432, FDA or LFGB, and which market’s paperwork.
A 30-minute call saves a return. We hold BPI, OK Compost HOME, FDA, LFGB and EN 13432 across the range, with OEM rim branding and flexible MOQ — a pallet per SKU works, a full container gets the better rate. Lead time: 20–30 days stock, 35–45 days for new tooling.
Where bagasse trays lose, and when they still win
Deep trays eat container space: a 50 mm inset takes 780 cartons where a shallow one takes 1,200. Heavier gram weights, heavier shipments. Unit price sits 35–120% above polypropylene. And no fibre tray handles a wet stew.
They win in tenders. EU and UK tenders increasingly carry a single-use plastics clause, and PPWR (EU) 2025/40 sets reuse and recyclability requirements for packaging producers — check specifics against your market. A school district showing compostable serviceware in its bid signs faster with fibre.
For mixed hot meals we default to a 29–31 g three-compartment base with a ribbed bottom: eight-high in a warm cabinet, a 3-minute microwave pass, no new tooling. The three-compartment bagasse food container uses the same pulp.
FAQ
What’s the difference between a bagasse meal tray and a clamshell?
A clamshell is hinged: base and lid are one pressing. A tray is a base with a film, board or pulp lid, stacks flatter and busses better on ward trolleys; clamshells close faster on a takeaway line.
Can these trays go in a microwave?
Yes, typically 2–3 minutes at 800–1,000 W. Never in a grill or combi oven. Print the limit on the sleeve.
How many trays fit in a 40HC?
Roughly 780–1,200 cartons, at 120–400 pieces each. Depth decides it: a 25 mm airline tray fits about 50% more than a 50 mm inset.
Are the trays home-compostable?
Certified to EN 13432, with OK Compost HOME on selected SKUs. Don’t market home compostability unless that SKU carries it; certification is per product, not per brand.
What MOQ applies to a custom compartment layout?
A new mould needs ~100,000 pieces to amortise. Existing tools run from one pallet of 120–200 cartons, with a clear price drop at a full container.
Do lids come separately?
Yes — pulp, clear PLA or board sleeves. Lids ship on their own carton line; a pulp lid adds 8–11 g per tray.
Request a tray spec
Send menu, hold time and stack height. We’ll return a tray drawing, a gram weight recommendation and a landed cost — not a bare unit price. The quote request takes five minutes; the contact page reaches our export desk directly. For the plant and certification side, see our sugarcane bagasse tableware manufacturer page. If your menu runs wet, say so early. We’d rather sell a different tray than take a return in nine months.
