Start with the chocolates, then work outward. The shape, dimensions, mass, surface decoration, wrapper and removal needs of each piece define the cavity. The cavity array and wall geometry define the tray. The tray perimeter, depth and layer stack define the box. Write down contact-material and documentation requirements alongside the layout brief. Before approval, request food-contact, grease, moisture, odour and temperature evidence for the exact material and intended use.

That order matters. A tray that fits beautifully is still unapproved if the contact documentation does not cover your market. A material with an attractive environmental claim is not automatically suitable for direct chocolate contact. This guide walks through the sequence a buyer, product team and packaging engineer can work through together before requesting quotation and samples.

Build the cavity brief from the actual chocolates

Start with the products, not the tray. For each stock-keeping unit, record the finished chocolate's length, width and height, its mass, and the tolerance you can accept on those dimensions. Then add the details that are easy to overlook: moulded surface texture, hand-painted or printed decoration, exposed fillings, cocoa butter bloom sensitivity, sharp corners, and whether the piece is naked, foil-wrapped, flow-wrapped or seated in a paper cup.

The last point changes the specification substantially. If the chocolate sits inside a wrapper or cup, the pulp touches the wrapper, not the food. If the chocolate is meant to sit directly in the cavity, the pulp is a food-contact surface and the evidence requirements are different. Write down which it is for every SKU rather than assuming one answer covers the range.

Also describe how the piece should be removed. A deep, closely fitting cavity may hold a truffle securely in transit but be awkward for a customer lifting it out at the table. Fingertip clearance, a shallow scoop under the piece, or a slightly wider cavity opening can solve this, but each choice trades off against movement in the box. If decoration must not be touched, say so, because the removal geometry then has to protect the decorated face as well as the base.

Where possible, supply physical chocolate samples or accurate technical drawings rather than a verbal description. A drawing should state the measurement basis, such as maximum outer dimension including any decoration, because a moulded piece is rarely a perfect box.

Set cavity count, spacing and layer arrangement

Once each piece is described, decide the arrangement. A uniform assortment, such as twelve identical truffles, allows a regular grid with consistent cavity spacing. A mixed assortment needs a layout that reflects the actual product map, because a large bonbon and a small square in adjacent positions will not share the same cavity depth or wall position.

Published product configurations show the range rather than a fixed standard. One six-compartment sugarcane pulp chocolate insert tray is a moulded tray with six cavities, while a nine-piece divided chocolate pulp tray uses a moulded divider arrangement for truffles and similar pieces. These are configuration examples only. Neither establishes cavity dimensions, tolerances or suitability for your chocolates. Treat them as starting points for a conversation, not as catalogue sizes to order from.

When setting the layout, agree on these points with the supplier:

• Cavity count and the exact product assigned to each position.
• Spacing between cavities and the wall thickness between them.
• Cavity depth relative to product height, including how much of the piece sits above the tray surface.
• Dimensional tolerance on cavity width, depth and position, and how it is measured.
• Whether a single-layer or multi-layer arrangement is needed, and how layers are separated.
• Orientation marks or position numbering if the pack line assembles to a fixed product map.

Ask for the tolerance in writing and ask how it will be checked on the approval sample. A tolerance figure without a measurement method is difficult to enforce.

Match the molded-pulp tray to the box

The tray is an internal component, so its outside dimensions have to work with the box, not just with the chocolates. Confirm the tray's overall perimeter against the box's internal dimensions, allowing for the box material, any lining, and the clearance needed to lower the tray in without forcing it.

Depth is the next constraint. The tray base, cavity depth and any layer above it all consume vertical space. Check lid clearance. A chocolate that protrudes above the tray rim may look generous in an open box but contact the lid once closed, which risks the decoration and lets the piece settle. If the assortment uses two layers, specify how the upper tray rests on the lower one and whether a separator sheet is needed.

Then think about how the box is actually packed and shipped. Will the tray be loaded flat or on edge? Does the box travel upright, and does the chocolate map stay in the intended orientation? Stacking load on outer cartons can transmit through the box and tray, so describe the transport route and stacking expectation to the supplier and agree what transport validation is appropriate.

This article stays with the insert and its fit inside the box. Rigid outer-box structure, board choice and print layout are a separate specification exercise. If your team is changing both at once, keep the tray brief and the outer-box brief as separate documents so that a change to one does not silently invalidate the other.

Separate food-contact and barrier questions from structural fit

A tray can pass every fit check and still fail the compliance review. Molded pulp, sugarcane pulp, bagasse and similar fibre materials may be described as biodegradable or compostable, but those environmental attributes do not by themselves establish food-contact suitability, grease resistance, moisture behaviour, odour performance or temperature tolerance.

For direct-contact use, specify the exact material and the intended use, then request product-specific food-contact documentation for your target market. In the United States, the FDA's information on food packaging and other food-contact substances explains that food-contact substances include packaging components and substances applied to packaging surfaces, and that where authorisation is required the agency considers intended use along with migration and toxicological data. That is general regulatory background, not a statement that any particular insert is authorised or suitable, and it does not replace a review against the rules of the country where you will sell.

Chocolate brings its own questions. Cocoa butter and some filled pralines may leave grease marks, and the surface finish of a fibre tray may affect how a piece slides or releases. Rather than relying on a general material reputation, ask for grease and moisture test results for the actual material and finish proposed, and ask what test method was used. Likewise, ask whether the material has an odour that a delicate chocolate could pick up, and request any odour assessment the supplier can provide.

Temperature is a further boundary. Do not assume that a fibre tray insulates, prevents condensation, or protects against melting. These are performance claims that need evidence for your product and route. If your distribution includes warm or fluctuating conditions, describe them in the enquiry and ask what the supplier can substantiate.

A simple way to keep the two workstreams apart is to record structural fit and contact evidence as separate approval items, each with its own owner and its own evidence.

A simple fit-and-evidence table

Use a short table like this to keep the specification readable across teams. The columns are the decision inputs. The values come from your own product data and your supplier's written responses, not from generic assumptions.

Approve a complete assortment sample

Sample approval should use the real assortment in the real box. A tray tested with a single representative chocolate will not reveal whether a large piece lifts a small one, whether a decorated surface rests against a wall, or whether the lid closes cleanly once every cavity is filled.

Build the approval sample as a full set: every SKU in its intended cavity, in the intended wrapper or cup, inside the actual box with the intended lid and any layer separators. Then check it in the ways the product will be handled.

A useful approval checklist:

• Every chocolate seats without force and without rocking in its cavity.
• Decorated or fragile faces are clear of walls, lid and neighbouring pieces.
• There is a workable way to lift each piece out.
• The tray drops into the box without distortion, and the lid closes with the specified clearance.
• Layer separators sit correctly and the upper layer does not press on the lower pieces.
• Cavity dimensions and positions are measured against the agreed tolerance and method.
• The contact material, finish and any wrapper or cup are recorded against the approved sample.
• Odour is checked on the actual material, not just described.
• Marking, position numbering or orientation aids are legible if required.
• The transport validation plan is agreed and recorded before the sample is signed off.

Keep the approved sample and a signed record of what it represents: material, finish, cavity layout, box used, and any deviations accepted. If production later differs from that record, you have a clear basis for the conversation.

Prepare the tray enquiry and approval record

A clear enquiry shortens the back-and-forth and gives the supplier something concrete to quote against. Send the product data first, then the structural brief, then the compliance and performance questions.

Include in the enquiry:

• Chocolate samples or drawings for every SKU, with dimensions, mass and tolerance basis.
• Decoration type and which surfaces must not be touched or marked.
• Wrapper, foil or paper cup details, and whether direct food contact is intended.
• Required cavity count, the product map, and single or multi-layer arrangement.
• The outer box's internal dimensions and the lid clearance available.
• Target markets and the food-contact rules you need to satisfy there.
• Grease, moisture, odour and temperature information you need substantiated.
• Quantity expectation, sample route and the transport validation you plan.
• Questions on mould or tooling, cavity tolerance, production and shipping lead time.

The last two lines are procurement questions rather than assumptions. Ask how tooling is handled, what cavity tolerance can be held, what the sample route looks like, and what quantities and lead times apply to your brief. Do not treat any figure as agreed until it appears in the supplier's written response.

For range context, Otara's food packaging collection shows several pulp formats, including chocolate trays alongside other food packaging. It helps you see available directions; it does not confirm that a specific configuration suits your assortment.

What to send and what to ask

A practical way to close the loop is to send one enquiry document containing the product map, the box drawing and the evidence questions, and to ask for a written response item by item. Then keep the supplier's answers alongside the approved sample so that the approval record and the quotation refer to the same specification.

If you are planning a chocolate or truffle insert project, share the piece dimensions or samples, the cavity count and arrangement you have in mind, your box internal size, your target market, the expected quantity and any documentation or test requirements. With those inputs, the specification conversation can move to fit, evidence and sample approval rather than guesswork.

Frequently asked specification questions

Can a molded pulp tray touch chocolate directly?

That depends on the exact material, its intended use and the rules of your market. Direct contact makes the pulp a food-contact surface, so request product-specific documentation for the material and use you are considering rather than relying on the general reputation of fibre packaging.

Does a sugarcane or compostable tray protect against melting or grease?

Not by definition. Environmental attributes and protective performance are separate questions. Ask for grease and moisture test results and any substantiated temperature data for the proposed material, and describe your route conditions in the enquiry.

How many cavities should the insert have?

There is no universal count. It follows from the assortment, the product map, the box size and the packing process. A uniform set may suit a regular grid; a mixed selection usually needs a custom layout.

What if the chocolates change after the mold is made?

Cavity geometry is tied to the pieces it was designed for, so a change in size, decoration or wrapper can affect fit and protection. Tell the supplier early and ask whether a new sample and layout review are needed before production.