Choosing packaging foam starts with the product you need to protect, not with the colour or the deepest sheet available. The correct packaging foam sheets should control movement, separate the item from hard surfaces and fit the available box or case without making it difficult to close. A light retail product, a delicate electronic component and a heavy tool place different demands on the foam. Before selecting a grade, record the item dimensions, weight, fragile areas, storage conditions and likely journey. Then decide whether the foam will act as a simple liner, a layer between products, a shaped insert, a lid pad or a complete protective surround. This approach gives you a clear reason for every material and thickness choice.
What packaging foam should achieve
Packaging foam can perform several jobs within the same box or case. It may reduce direct contact with rigid walls, fill spare space, separate individual components, support a product in a fixed position or provide a softer surface around delicate finishes. A successful design uses the foam for a defined purpose rather than adding material without understanding what it needs to do.
Movement is one of the first issues to consider. If an item can slide across a box, it may strike the sides repeatedly during handling. Foam can help limit this movement when it is measured and positioned correctly. The item should not be loose, but the foam should not apply uncontrolled pressure to fragile switches, lenses, connectors or decorative surfaces.
Distance from the outer container also matters. A thin liner may prevent scratching but provide little space between the product and a hard case wall. A deeper base or side layer creates more separation. The correct amount depends on the product, the packaging construction and the available internal space.
Surface protection is another separate requirement. A product with a polished, painted or delicate finish may need a clean contact layer even when the surrounding case already controls movement. Consider which surfaces can safely touch the foam and whether another wrapping or protective layer is needed.
The packaging must also remain practical. Staff or customers should be able to remove and replace the item without tearing the insert or forcing it through an opening that is too tight. A well planned insert protects the product while keeping packing and unpacking straightforward.
Begin with the item and its journey
The same product may need different packaging for local storage and national delivery. Start by considering where the package will go and how often it will be handled.
A product stored on a shelf may mainly need separation from dust, scratches and nearby items. A parcel travelling through a delivery network may experience repeated movement and changes of orientation. Equipment carried in a reusable case may be packed and unpacked many times. Each situation affects the most suitable foam layout.
Record the weight of the item and note where that weight is concentrated. A product with a heavy base and delicate upper section should not be supported in the same way as a light object with an even shape. Identify handles, corners, protruding parts and controls that should not carry pressure.
Consider how the item will enter the packaging. A top loading case usually needs a clear opening and a base that supports the item when it is lowered into place. A hinged presentation box may use a base recess and a separate lid layer. A shipping carton may use flat layers, corner pieces or dividers instead of a detailed insert.
Also decide whether the packaging will be used once or repeatedly. Repeat use makes accurate fit, easy removal and durable construction particularly important. It is useful to keep a written specification for the foam grade, sheet size, thickness, colour and cut dimensions so replacement inserts can be ordered consistently.
Flat packaging foam for liners, layers and simple inserts
flat packaging foam sheet is a high impact, lightweight material intended for protective packaging such as flight cases, briefcases and cardboard boxes. Its flat surface makes it useful for box liners, separating layers, simple pads and inserts that need an even contact face.
Flat foam is often the clearest option when you need a known depth across the whole surface. It can line the bottom of a box, sit between stacked products or form side pieces around an item. It can also be cut into several smaller components where the design needs separate blocks rather than one full sheet.
The current range is available in 76cm by 100cm, 230cm by 100cm and 230cm by 200cm sheet sizes. Thicknesses run from 1/4 inch, which is 6.3mm, through to 4 inches, which is 101.6mm. Select the sheet size by planning the pieces you need and allowing for sensible cutting space. Select thickness by the role of the foam, the available case depth and the distance required around the item.
A thin flat sheet may work as a liner or separator. A deeper sheet provides more material for a substantial pad or shaped recess. Extra depth is not automatically better. It can reduce the usable space, raise the item too high or stop a lid from closing correctly.
Packaging Foam Flat Sheet is not fire retardant and is not suitable for upholstery. If the project is furniture related, use the product guidance within our upholstery foam sheet guide rather than treating packaging foam as a cheaper substitute.
What if you are replacing convoluted lid foam?
Convoluted or egg-crate foam is often associated with case lids because its raised surface can contact items of slightly different heights. All Foam does not currently list a convoluted packaging foam sheet for online purchase, so the current range focuses on flat polyurethane, anti-static, semi-rigid, closed-cell and dense protective options.
If you are replacing an older profiled lid insert, measure the maximum foam height, the available lid clearance and the item positions before selecting a replacement. A flat cushioning layer, shaped insert or separate pad can often be planned around the same practical goal without assuming that the new material must copy the original surface shape.
Do not rely on any surface profile to correct a poorly sized case. The item still needs adequate support beneath it and enough clearance around fragile areas. Check the closed position carefully and make sure the lid does not apply excessive pressure to the product.
The separate flat versus convoluted packaging foam guide is retained for customers researching the two profiles and explains how contact area and compression differ.
Anti static foam for electronics and sensitive equipment
Electronic components and certain sensitive devices may need an anti static packaging material rather than ordinary cushioning foam. pink anti static packaging foam is an anti static polyurethane foam designed to help protect electronics and other sensitive items during storage and transit.
AS22 is available in the same three sheet sizes and thickness range as the flat packaging sheet, from 1/4 inch to 4 inches. This allows it to be used as a thin layer, separator, pad or deeper insert where the product requirements support that choice.
Do not select packaging foam for electronics by appearance alone. A pink colour on an unrelated material does not prove that it has the required property. Use the named product, read the product details and check the relevant technical data sheet before ordering for a controlled or specialist application.
The AS22 product is listed as fire retardant. That does not mean every packaging foam has the same status. Fire information varies across the range and must be checked product by product.
When designing packaging around electronics, note the position of pins, sockets, screens and exposed controls. The insert should support the main body without placing unnecessary force on these areas. Small accessories and cables may need separate compartments so they do not move against the device during transport.
Semi rigid Ethafoam for transit protection
Ethafoam STPE200 Semi-Rigid Packaging Foam Sheet is a medium density, non cross linked expanded polyethylene foam. It is described within the current range as lightweight, protective and water resistant, with uses across packaging, transit protection and industrial applications.
The product is available in white or grey. Sheet sizes are 100cm by 120cm and 200cm by 120cm. Thickness options run from 5mm to 100mm. This metric range gives useful choice for liners, separators and deeper protective components.
The semi rigid structure is different from flexible flat polyurethane packaging foam. Choose it where that firmer form suits the item and packaging design. It may be useful for transit components that need to retain a more defined shape, but the complete design still needs to be measured and tested.
Ethafoam STPE200 is not fire retardant. It should not be substituted into an application that requires a verified fire performance.
Closed cell foam for firmer packing and moisture resistance
Closed cell materials have a different structure from standard open cell packaging foam. The current closed cell range includes AFP30 and AFP45 polyethylene grades, with EPDM available where a flexible closed-cell rubber is more appropriate. These materials are non absorbent or water resistant according to their individual product descriptions and can suit protective lining, packing and specialist inserts.
Our open cell and closed cell foam guide explains the basic structural difference. The correct choice depends on the item, the required rigidity, the environment and the way the foam will be fixed.
AFP30 closed cell polyethylene
Closed Cell Polyethylene Sheet AFP30 is a rigid black or white foam with a non absorbent, waterproof structure. It is intended for lining, sealing, protective packing and other practical uses where closed cell foam is required.
It is available in 100cm by 100cm and 200cm by 100cm sheets, with thicknesses from 2mm to 100mm. Black and white colour options allow the material to be selected for practical or presentation requirements.
AFP30 is not fire retardant. The product guidance advises customers to contact All Foam where a fire retardant option is needed.
AFP45 closed cell polyethylene
Closed Cell Polyethylene Sheet AFP45 is a black rigid grade that is more rigid than AFP30. It is intended for demanding packing, lining and sealing uses where the greater rigidity is appropriate.
It uses the same two sheet sizes and the same 2mm to 100mm thickness range as AFP30.
Do not assume that AFP45 is automatically the better choice because it is more rigid. A lighter item or a design that needs more flexibility may be better matched to another material. Rigidity should serve the packaging design, not replace it.
AFP45 is not fire retardant.
Plastazote LD33
Plastazote LD33 is a nitrogen expanded, cross linked closed cell foam historically used for packaging, lining, protection, display and specialist applications. All Foam no longer lists Plastazote for purchase; compare AFP30 and AFP45 for current rigid closed-cell polyethylene options.
The available colours are black, white, blue, red, yellow, purple, orange, pink and light grey. This wider colour choice can be useful for presentation packaging, visual identification or matching an existing project design.
Sheet sizes are 100cm by 100cm and 200cm by 100cm. Thicknesses range from 3mm to 50mm.
Colour can support presentation and organisation, but it should not become the main selection factor. Confirm the material structure, depth and application before choosing the visual finish.
How to choose packaging foam thickness
Thickness should be selected after the foam grade and layout are decided. It controls how much space the material occupies and how far the item sits from the box or case wall. It also affects how much material is available for a shaped recess.
Begin with the internal depth of the container. Subtract the product depth, then consider how the remaining space will be divided between the base, lid and any additional layers. Include every component in the calculation. A design can fail even when each individual piece seems reasonable if their combined depth is too large.
For example, a case may need a base layer, the item itself and a lid layer. Side pieces may also occupy width and length. If the item has a tall control or handle, the lid foam should not press directly onto it.
Thin foam can provide separation or surface protection where space is limited. Deeper foam can create a substantial base or allow a recess to be cut into the material. Convoluted foam must be considered by its profiled shape rather than compared directly with flat foam of the same nominal depth.
The full foam sheet thickness guide explains the available ranges across packaging, closed cell, upholstery and acoustic products.
Measure the box, product and foam layout separately
Accurate measuring is essential because the outer dimensions of a box do not show the usable space inside it. Wall thickness, hinges, fittings, handles and lid construction can all reduce the internal area.
Step 1: Measure the usable interior
Measure the internal width, length and depth at more than one point. Cases and handmade boxes may not be perfectly square. Note any hinge blocks, catches, rounded corners or other obstructions.
Step 2: Measure the product at its widest points
Record the overall width, length and depth, including controls, handles and connectors. Do not measure only the main body if another part projects beyond it.
Step 3: Identify fragile and load bearing areas
Mark surfaces that can support the product and parts that should remain clear. The foam should carry the main structure rather than press against delicate details.
Step 4: Plan every foam component
Record the base, lid, sides, dividers and any insert layers. Add their dimensions together and check them against the usable interior.
Step 5: Allow practical removal space
A recess should hold the item securely without making it difficult to remove. Consider finger access or a suitable opening where the product must be lifted regularly.
Step 6: Create a template before cutting valuable material
A card or paper template can help confirm the shape and orientation before the final foam is cut. Mark the top, front and product direction clearly.
Our guide to measuring foam before ordering provides a wider measuring checklist for foam projects.
Plan shaped inserts carefully
A shaped insert can present and protect a product more effectively than loose pieces, but accuracy matters. Begin with a simple outline and add detail only where it improves support or access.
Avoid making the recess tight around every small feature. The main objective is to hold the product body in a stable position. A very detailed opening can be difficult to cut and may tear at narrow sections. It can also make the item hard to remove.
Keep enough foam between the recess and the outside edge of the insert. A narrow strip may bend or split during use. The correct margin depends on the material, thickness, product weight and case design, so there is no universal measurement that suits every insert.
For multiple items, provide separation so hard components cannot strike one another. Arrange frequently used products where they can be removed without disturbing everything else. Accessories should have their own spaces rather than being left loose above the main item.
If the packaging will be produced repeatedly, keep the final dimensions and orientation notes. Label templates clearly and record which side faces upward.
Fixing packaging foam
The current AFP30 and AFP45 sheets are supplied unbacked. Many packaging inserts do not need permanent bonding because the case, cavity or surrounding layers retain the foam.
Where a fixed liner is required, choose a separately specified compatible fixing system only after the insert has been measured and dry fitted. Loose removable inserts can be easier to replace, clean or reconfigure.
Fire information must be checked by product
Packaging foam does not have one shared fire classification. The current products include both fire retardant and non fire retardant materials.
Antistatic Pink Packaging Sheet AS22 is listed as fire retardant. Packaging Foam Flat Sheet, Ethafoam STPE200, AFP30 and AFP45 are listed as not fire retardant. Plastazote LD33 should be checked against its own product details and technical document for the intended application.
Never infer fire performance from colour, density, thickness or appearance. Read the product card and technical data sheet. Our fire retardant foam guide explains what information to check before using foam in furniture, commercial or regulated environments.
Common packaging foam mistakes
Choosing foam before measuring the container
This can leave too little room for the product or create layers that do not fit together. Measure the usable interior first.
Selecting only by colour
Colour can support presentation, but it does not establish whether a foam is anti static, closed cell, fire retardant or suitable for the item.
Assuming the deepest sheet gives the best protection
Excess depth can stop the case closing, compress fragile areas or raise the item into the lid. Thickness must fit the whole design.
Allowing pressure on fragile parts
Support the main body of the product. Keep foam away from controls, connectors, lenses and other areas that should not carry load.
Using ordinary packaging foam for sensitive electronics
Where anti static protection is required, use a product identified for that purpose and check its technical information.
Treating packaging foam as upholstery foam
Packaging grades are designed for protection, not seating comfort. Use furniture grade foam for upholstery projects.
Ignoring the lid layer
A secure base alone may not prevent movement when a package is turned or handled. Consider the complete surround, including the lid and sides.
Forgetting removal access
A tightly shaped recess can protect the product but make it frustrating to lift out. Plan a safe grip point or opening.
Practical examples of product selection
A cardboard box containing a general retail product
Flat packaging foam may be used as a base, separator or side liner. Measure the internal carton and decide whether the aim is surface protection, movement control or both. Use only the depth that fits around the packed product without distorting the box.
A reusable case for camera or test equipment
A flat or closed cell base can provide a defined support surface, while a suitable flat lid pad or shaped cushioning arrangement can control vertical movement. Keep pressure away from screens, lenses and controls. Separate accessories so they cannot move against the main equipment.
Packaging for electronic components
AS22 anti static foam should be considered where anti static protection is required. Confirm the technical data and provide separate spaces for small parts, leads and connectors.
A presentation insert with a colour requirement
Where colour is a core requirement, a specialist coloured closed-cell material may need to be sourced separately. For current All Foam products, choose AFP30 or AFP45 by structure, thickness and required rigidity. A simple, accurate recess often produces a cleaner result than an unnecessarily complex shape.
A semi rigid transit separator
Ethafoam STPE200 may suit a design that needs a lightweight semi rigid polyethylene sheet. Select between white and grey, then choose the depth that fits the packaging layout.
Final packaging foam checklist
Before ordering, confirm the exact product and the role it will perform. Record the usable internal dimensions of the box or case, the full product dimensions and the fragile areas that must remain clear. Plan the base, lid, sides and dividers as one complete layout.
Check whether the item needs anti static protection, water resistance, a closed cell structure, a semi rigid material, a particular colour or a particular fixing requirement. Confirm the fire information for the exact grade. Select thickness only after all these requirements are understood.
Finally, make sure the finished design can be packed, closed, carried and reopened without forcing the product or foam. A packaging insert is successful when it protects the item, fits the container and remains practical for the people using it.
