Solar Panel Packaging: Where EPP Foam Earns Its Place

Overview

Photovoltaic logistics looks like glass logistics and is not. A solar module is a 2.3 metre laminated plate that usually fails invisibly, and a string inverter is a 40 kg box whose most delicate feature is a heatsink nobody is allowed to touch. Moulded EPP foam earns its place in that picture — but at the corners, the edges, the electronics cavities and the pallet base, not wrapped around the module.

Every few weeks a packaging engineer asks us to quote a foam crate for a photovoltaic module. It is a reasonable question asked by someone who has not yet done the arithmetic, and the honest answer is usually no. A 1,722 × 1,134 mm laminate cannot be protected by foam alone, because foam is a spring and a plate that long needs a rigid frame to keep its span short. The modules survive because the pallet, the frame and the stack geometry are right — and then the foam does a handful of very specific jobs extremely well.

This article is about those specific jobs. It sits alongside rather than on top of our existing guides: if your cargo is bottles rather than busbars, the failure mechanics are different and so is the design (glass bottle protection in transit); if the problem is holding a temperature, that is pharma cold chain packaging; if the cargo is a battery pack inside a vehicle, that is EPP in EV battery packs. Here the question is narrower and more practical: in a photovoltaic supply chain, which foam part is doing real work, and which one is decoration?

A solar module is not a pane of glass

The mental model most buyers carry into this conversation is “fragile flat thing, therefore foam corners and a big fragile label”. That model is wrong in a way that costs real money, because it misallocates protection. A module is a composite sandwich: tempered front glass, encapsulant, solar cells with soldered ribbons, then either a polymeric backsheet or a second sheet of glass, all held in an anodised aluminium frame with a potted junction box bonded to the rear face. Each of those layers fails in a different mode, and only one of them is the mode people worry about.

Table 1 — Six layers, six different failure modes. Only the first is the one buyers plan for.
Layer	Typical construction	How it fails in transit
Front glass	Tempered, 2.0–3.2 mm depending on format	Edge chip and edge crush; tempered glass is strong on the face and weak on the 3 mm edge
Frame	Anodised aluminium, mitred corners, silicone seal	Corner deformation from a point impact at the four corners; seal breach lets moisture into the laminate edge
Encapsulant and cells	EVA or POE laminate with soldered cell ribbons	Micro-cracks from bending and vibration — invisible, and not detectable by eye at goods-in
Backsheet	Polymeric film, or glass in bifacial formats	Scuffing, puncture from a protruding object, and abrasion against the module stacked behind it
Junction box and cables	Potted box bonded to the rear, 15–25 mm proud; MC4-type connectors	Crushed box, bent connector pins, cable insulation cut by a frame edge
Mounting holes and frame lips	Slots and clamp zones on the long edges	Deformation that later prevents clamps seating, discovered on the roof rather than at the dock

The second thing to internalise is how little a module weighs relative to its size. A common 1,722 × 1,134 mm format covers 1.95 m² and masses roughly 21–24 kg, which is about 11–12 kg/m². A 30 mm slab of stone of the same footprint would weigh well over 150 kg. Photovoltaic packaging is therefore not a weight problem. It is a plate-bending problem, and plate bending is governed by span, not by area.

For a plate or beam, deflection under a uniform load scales with the fourth power of the unsupported span. Double the distance between supports and deflection rises roughly sixteen-fold; halve it and deflection falls to about a sixteenth. This single relationship explains almost every good and bad decision in module packaging. A stack that is supported at its two short ends only will sag under its own weight plus the modules above it, and a sagging laminate delivers exactly the distributed bending that generates cell micro-cracks. Adding a support under the middle of the span is worth more than adding ten millimetres of foam anywhere.

The one rule that matters most

Shorten the span before you thicken the foam. Foam manages impacts; it does not manage sag. If a pallet of modules deflects when you press the middle of the stack, no corner protector on the market will fix it — the pallet deck, the intermediate bearers and the frame are the parts that need attention.

The five failure modes that actually occur

Ask a photovoltaic logistics manager what goes wrong and you will hear the same five stories, in roughly this order of frequency. Each one maps to a different packaging feature, which is why a blanket “more foam” answer never solves all of them.

1. Edge chip and edge crush

The 3 mm glass edge is the weakest surface on the module and the easiest to land on something hard. A module rested momentarily on a pallet corner, or a stack whose bottom module sits on a rough deck, produces a chip that propagates into the laminate within a few thermal cycles. The fix is an edge engagement, not a corner cap.

2. Frame corner deformation

The four mitred corners take impacts that the long edges shrug off. A deformed corner distorts the frame-to-glass seal and creates a moisture path at the exact point where the laminate is most vulnerable. Corner protection must wrap the corner in three directions, not just sit on the face.

3. Micro-cracks from bending and vibration

Road and rail excitation, stack settling and handling all bend the laminate. Cells crack along the busbar and finger lines. Output falls by a few percent, or by twenty, and nothing looks wrong. This is the failure mode that makes packaging validation a test question rather than an inspection question.

4. Junction box crush and connector damage

The junction box stands 15–25 mm proud of the rear face. Stack two modules rear-to-rear without a relief pocket and the box of one presses into the backsheet of the next, at a point load, for six weeks at sea. This is the most commonly omitted feature in low-cost packaging designs.

5. Abrasion between modules

Relative movement of a fraction of a millimetre, repeated a million times over a road, polishes through a backsheet or scuffs a coating. Abrasion is not an impact problem; it is a clamping and friction problem, so it is solved by surface texture, separators and stack compression — not by thicker corners.

Failure mode three deserves a paragraph of its own, because it inverts the usual quality-control logic. A chipped edge is visible. A micro-crack is not: the glass is intact, the frame is straight, the module powers up on a simple tester, and the damage only reveals itself as an underperforming string months later on a roof, when the cost of a warranty claim includes scaffolding, labour and a replacement module. Electroluminescence imaging shows the cracks clearly, which is why serious buyers ask for EL samples from a transport test rather than a visual inspection report.

Goods-in inspection cannot find the most expensive defect

A receiving inspection that checks dimensions, glass condition and frame straightness will pass a pallet full of micro-cracked modules. If your contract measures packaging performance by “no visible damage on arrival”, it measures the cheap half of the risk. Either test the package before shipping, or accept that the other half of the risk arrives as a warranty claim two years later.

What the standards actually test

Photovoltaic standards are frequently cited in packaging conversations and frequently cited wrongly. The two famous ones are product standards, not transport standards, and neither of them tells you anything about how a pallet of modules behaves on a ship.

Table 2 — The standards that come up in photovoltaic packaging reviews. Confirm current editions with your test house before writing them into a contract.
Reference	What it covers	What it does not tell you
IEC 61215	Module design qualification and type approval, including a mechanical load test at 2,400 Pa and 5,400 Pa	Those loads represent wind and snow on an installed module, not a stack in a container
IEC 61730	Module safety qualification, including fire class and electrical safety	Nothing about packaging; a Class C rating is a property of the module, not of the carton
IEC 62759-1	Transportation testing of module package units — the packaged module, not the bare laminate	It quantifies a risk under a defined profile; it does not certify zero damage in your lane
IEC 60068-2-6 / -27 / -64	Sinusoidal vibration, shock, and broadband random vibration test methods	These are methods, not acceptance criteria; you and your customer must agree the severity
ISTA 3E / 3A	Unitised loads of similar packaged products / parcel-shipped single packages	Useful for pallet loads and for microinverter cartons; check which series matches your actual distribution
ASTM D4169	A distribution cycle framework with user-selected severity levels	You choose the levels, so the result is only as meaningful as your choices

For a buyer, the practical takeaway is a single question to put in the enquiry: which transport test does the packaged unit pass, at what severity, and can I see the report including the electroluminescence images before and after? A supplier who can answer that has a validated design. A supplier who answers “we have exported for fifteen years” has an anecdote, which is not the same thing — and a supplier who says “we drop test it” without naming a method has neither.

Where EPP foam earns its place: corners and edges

This is the largest genuine use of moulded EPP in photovoltaic logistics, and it is a case where EPP beats the alternatives on physics rather than on marketing. A corner protector has to do four things at once: absorb a point impact, spread the reaction over a larger area of the frame, survive being reused, and not contaminate the product.

Table 3 — Corner protection options compared on the four criteria that matter for photovoltaic modules.
Option	Behaviour on impact	Reuse	Contamination risk	Where it wins
Moulded EPP	Resilient; recovers most of its thickness after impact, so it can take several hits	High — tens of trips with inspection	None: closed cell, does not shed beads	Multi-trip pallet pools, high-value formats, dusty or clean-room-adjacent sites
Moulded pulp	Crushable; one good impact and the energy absorption is spent	Low	Fibre dust, which is manageable	One-way shipments where cost dominates and damage history is good
EPS	Crushes progressively; excellent first-impact absorber, then useless	None — single trip by nature	High: beads fracture and migrate, and they stick to surfaces electrostatically	Low-value one-way consumer packaging, never a module line
Corrugate corner	Little energy absorption; relies on the frame being strong	One or two trips at best	Low	Cost-first, short domestic lanes, modules with heavy frames
Timber battens	Rigid, so it transfers impact rather than absorbing it	High, if the design allows	Moisture and ISPM-15 treatment obligations	Structural crating and long-span support, not point protection

The contamination column deserves emphasis because it is routinely underestimated. Expanded polystyrene beads are electrostatic, lightweight and almost impossible to remove once they are inside a stack. They lodge in frame channels, settle into junction box cavities and cling to backsheets. On an installation site, a bead trapped between a module and a rail becomes a point load; in a warehouse, beads migrate for months. Moulded EPP has no beads to shed because the part is a single fused moulding — that property alone justifies the material in a photovoltaic line, independent of any performance claim.

Design rules for the part itself are unglamorous and decisive:

Engage three faces, not one. A corner protector should contact the front face, the rear face and the edge, so an impact from any direction loads foam in compression rather than in shear. A flat pad on the front face only is a sticker with ambitions.
Keep the load out of the glass edge. The part should bear on the aluminium frame, with a relief so the glass edge itself never becomes the contact surface. Ten millimetres of relief costs nothing and removes a whole failure mode.
Wall thickness by duty, not by habit. For a stack of thirty modules, 8–12 mm of EPP at 50–70 g/L at the corner radius is a sensible starting point for impact; thin sections at the radius are where these parts fail first.
Design in the relief pocket for the junction box. If your corner part is also the stack spacer, the pocket must clear the box by several millimetres under full compression, not at nominal dimensions.
Give it a stack register. Interlocking features make a pallet of modules stack squarely, which prevents the relative movement that causes abrasion, and make depalletising safer for the two people doing it.
Specify colour for a reason. A bright colour is not decoration: it makes a lost protector visible on a site floor, and visible damage on a reused part is easier to spot. Black parts hide the cracking that retires them.

Where EPP foam should not be used

Being clear about the limits is more useful than another list of benefits. In photovoltaic logistics there are five jobs where moulded EPP is the wrong answer, and proposing it damages your credibility with the engineers who will review the design.

The module crate itself. A 2.3 m span needs a rigid frame to keep deflection in check. Foam is a spring; a spring is precisely what you do not want under a plate that fails by bending. Timber or steel frame plus corrugate sleeve remains correct, with foam only at the interfaces.
Any moisture barrier function. EPP is closed-cell and does not absorb water in bulk, but it is not a vapour barrier and must never be specified as one. If a module or an inverter needs humidity control, that is a foil barrier bag plus desiccant, with the foam inside it as a mechanical part only.
Long-term outdoor storage. Polypropylene without stabilisation degrades under ultraviolet light; stabilised packaging grades last longer, but a pallet of protectors left in the sun for a season will chalk, embrittle and then fail in someone's hands. Keep reusable protectors under cover, and say so in the returnable loop contract.
High-temperature load paths. EPP softens around 100–110 °C, and under sustained load it begins to creep well below that. A corner block carrying 700 kg through a six-week sea voyage in a hot container is a creep calculation, not a cushioning calculation — and the honest answer is often a rigid pallet deck taking the load, with foam only shaping and locating.
Bulk fire-rated storage. EPP is a combustible plastic. Large volumes of foam packaging in a warehouse raise sprinkler design, insurance and fire-loading questions that a packaging datasheet will not answer. Involve your insurer before you build a pallet pool, not after.

There is a commercial version of the same honesty. For a single one-way shipment of low-cost modules on a short domestic lane, a moulded pulp corner plus a well-designed corrugate sleeve is frequently the cheaper answer that performs adequately. EPP becomes the right answer when the parts are reused many times, when bead contamination is unacceptable, or when the value per module is high enough that the difference between adequate and good is worth paying for. That calculation is the same one we set out in the closed-loop economics of returnable packaging, applied to a different cargo.

Microinverters, optimizers and other module-level electronics

Here the picture reverses completely. Module-level power electronics — microinverters, DC optimizers, rapid shutdown devices — are small, dense and mechanically awkward: a potted housing of roughly 0.5–3 kg with connectors protruding on two sides, a mounting flange, and a cable whip that must arrive straight. This is textbook moulded EPP territory, because the part is not protecting a plate, it is holding a brick.

The design logic is different from corner protection in three specific ways. First, the cavity does the work: a moulded pocket that matches the housing controls the unit in all six directions, so the energy of a drop is absorbed by controlled compression of a known wall rather than by whatever happens to hit the floor. Second, the standoffs belong at the corners of the housing, not under its centre — a central pad turns a face impact into a bending load on the housing, while corner standoffs let the wall compress and keep the housing in a rigid-body motion. Third, cables need a dedicated channel with a generous bend radius, because a connector that is loaded sideways in a carton is a field failure that looks like a manufacturing defect.

Wall thickness for a parcel drop. For a 1–2 kg unit in a parcel network, 15–20 mm of EPP at 40–60 g/L at the corners is a reasonable starting point, with the caveat that the drop height, the drop orientation count and the surface all belong in the test plan rather than in a rule of thumb.
Ribs instead of mass. A ribbed wall gives progressive crush — soft at first, stiffer as it compresses — which is what you want for a range of drop energies. A solid block is stiffer than necessary at low energy and bottoms out at high energy.
Do not load the connector. Every connector face should be a no-contact zone. If the cavity geometry cannot avoid it, redesign the cavity rather than adding foam.
Label and orientation. A moulded arrow costs nothing and prevents the upside-down carton that puts the cable whip under the unit's full weight.
ESD only if the part is genuinely ESD-sensitive. Most potted module-level electronics are not sensitive at the packaging interface, and specifying dissipative foam because it sounds rigorous adds cost for no benefit. Where dissipation genuinely matters, the grading and test method are set out in our guide to anti-static and ESD EPP foam.

String inverters: never carry load through the heatsink

A residential or commercial string inverter is 10–50 kg of aluminium housing, magnetics and a cast or extruded heatsink on one face. The heatsink is the single most protected feature in the design and the single most abused feature in the carton, because it is flat, it is at the bottom when the unit sits naturally, and it looks like a convenient place to put a foam block.

The fin exclusion zone

Never let packaging load pass through heatsink fins. Fins are thin aluminium, and a foam block pressed against them for weeks in a container will close the gaps, bend the tips and in the worst case crack a fin root. The unit still works when it arrives, and then derates for the rest of its life because its convection path is partly blocked. Load the chassis edges and the mounting flange, and design a clearance pocket over the entire fin field.

The second inverter-specific problem is sustained load. A 40 kg unit on a foam base, stacked two high on a pallet, in a container whose interior reaches 60–70 °C in sun, is a creep scenario: the foam slowly compresses, the stack settles, the cartons go slack and the units start moving against each other. The engineering answer is to keep sustained stress low — a working limit of roughly a third of the short-term compressive strength at 25 % strain is a common starting point for long-duration loads, and it should be verified against the foam supplier's creep data rather than assumed — and to put the real load into a rigid pallet deck or a corrugate block rather than into the foam.

Specify the foam by density and by the load it must carry over the shipment duration, not by appearance. A 60 g/L part and a 30 g/L part look similar in a photograph and behave nothing alike over six weeks.
Keep the mounting bracket and its hardware in a separate bagged compartment; loose brackets are the most common cause of cosmetic damage inside an otherwise well-designed carton.
Protect the display and the ventilation louvres with a clearance pocket, not with direct contact. Louvres deform easily and read as damage even when function is unaffected.
Design the carton so the unit cannot be lifted by its cable glands. If a handle exists, people will use it, so give them one in the right place.
For hybrid units with a battery module in the same carton, treat the battery as the primary mass and the electronics as the secondary — the reverse of the usual assumption.

Pallet and container arithmetic

Packaging decisions in photovoltaics are made or lost on cube, not on mass, and the numbers are worth writing down. The following uses a 1,722 × 1,134 mm module at about 22 kg as a worked example; substitute your own format, because module sizes change every couple of years and the conclusions move with them.

Table 4 — Worked arithmetic for one common module format. Values are indicative; recompute for your actual module and pallet pattern.
Quantity	Indicative value	Why it matters
Module footprint	1.95 m² per module	The unit of everything downstream
Modules per pallet	About 30 for this format	Set by stack height and pallet rating, not by preference
Loaded pallet footprint	Roughly 1.75 × 1.15 m, about 2.0 m²	The number that competes for container floor
Loaded pallet mass	Around 650–750 kg	Includes pallet, corner sets, sleeves and strapping
Container floor, 40 ft high cube	About 12.0 × 2.35 m, roughly 28 m² usable	Two pallets across, six rows deep in the simple case
Pallets per 40 ft high cube	Typically 12, sometimes 14 with a tighter pattern	Check the pattern with your forwarder, not with a drawing
Modules per 40 ft high cube	Around 360 at 30 per pallet	The real unit of freight cost
Total cargo mass	Around 8 t plus packaging	Far below the 26 t weight limit: the container is volume-limited

The consequence of being volume-limited is that every millimetre of packaging is paid for in modules not shipped. If a protective cap adds 50 mm to the height of each pallet and the container can only take the stack in one tier, that is 50 mm of air across twelve pallets. If a corner set widens the pallet footprint enough that the two-across pattern no longer fits, the loss is not 5 % — it is a whole row, and the freight cost per module moves by a tenth.

Price packaging in modules, not in euros per box

In a floor-limited container, the meaningful cost of a packaging change is how many modules no longer fit. A protector that costs a little more but preserves the loading pattern is cheaper than a cheaper protector that breaks it. Ask your packaging supplier to quote against your container pattern, and ask your forwarder to confirm the pattern for the actual module format — both answers change more often than the catalogue suggests.

The container heat problem

A steel container standing in sun on a terminal apron behaves like an oven. Interior air temperatures in the 60–70 °C range are routinely reported in summer conditions, and the surfaces nearest the roof run hotter still. That number matters for two reasons in this application, and neither of them is usually discussed at the quotation stage.

The first is foam creep. Polypropylene softens in the 100–110 °C region, and moulded EPP under sustained load creeps appreciably well below that. A corner block at 60 °C carrying a share of 700 kg for six weeks is being asked to do something quite different from what a short-duration compression test measures. The design response is not thicker foam; it is to reduce the sustained stress and to let a rigid member carry the mass.

The second is that the module is in the same box. Laminates, backsheets and junction box potting all experience the same thermal excursion, and a pack that has been through a hot container has a thermal history. If you are validating a packaging design, validate it as a sequence — vibration, then shock, then the thermal profile — rather than as three independent tests, because that is what the cargo actually experiences.

A specification checklist, part by part

The following is the table we would want to receive if we were the buyer. It is deliberately written as a specification rather than as a wish list, because a foam part that is not specified cannot be inspected, and a part that cannot be inspected will drift in production.

Table 5 — Part-by-part specification and test matrix. Every line should appear in the drawing pack, not in an email.
Part	Function	What to specify	What to test
Module corner protector	Point impact and stack register at four corners	EPP density, wall at radius, three-face engagement, glass-edge relief, colour, stack feature	Drop at the corner, compression set after 24 h, fit on the actual frame profile
Edge rail or end cap	Edge crush and span support along the long edges	Length, section, engagement depth, retention method	Edge drop, deflection of a loaded stack
Junction box relief pad	Clear the rear-face box under full stack compression	Pocket depth with tolerance, foam density, contact area	Compression at working load, clearance measured loaded
Interleaving separator	Prevent abrasion between modules	Thickness, surface texture, coefficient of friction	Slide test, abrasion after a vibration run
Pallet deck pad	Distribute load, protect the bottom module	Density for creep, area, drainage if outdoor	Long-duration compression at container temperature
Microinverter or optimizer tray	Six-direction location, drop absorption, cable channel	Cavity dimensions with tolerance, rib pattern, wall thickness, cable bend radius	Parcel drop per ISTA 3A, retention after drop
Inverter base and cap	Carry mass at the chassis, clear the fin field	Fin exclusion pocket, load path, sustained stress limit, stack height	Static load at 60 °C for the shipment duration, drop at the corner

Two habits make this table actually enforceable. The first is to put the test method, the severity and the acceptance criterion next to every requirement — the structure we set out in the EPP foam RFQ checklist. The second is to require a first-article report that includes the measured values, the date and the person responsible, which is the same discipline described in our tolerances and quality control guide.

How the cost actually compares

There is no useful absolute price for a corner protector, because the part is defined by the module it protects and by how many trips it has to survive. What is useful is the structure of the comparison, and the shape of the curve.

Take a set of four moulded corner protectors. The cost per module-trip is the set cost divided by the number of trips, plus inspection and replacement of failed parts, plus the freight and storage cost of the return leg. On a single trip, the EPP set is the most expensive option on the table — often several times a pulp corner. By the fifth trip it is usually level with a mid-priced one-way solution. By the fifteenth trip it is clearly the cheapest, provided the loop is actually closed: protectors that are lost, damaged or never collected never complete their payback.

Table 6 — Qualitative comparison. Any specific figure belongs in your own quotation with your own volumes and lanes.
Scenario	Dominant cost	Where EPP lands
Single one-way shipment, short domestic lane	Piece price of the protector	Rarely justified; pulp or corrugate usually wins
Single one-way export, high-value modules	Damage risk and warranty exposure	Often justified on risk, not on piece price
Installer pallet pool, regional	Reverse logistics and losses	Usually the best answer if the loop is managed
Utility-scale site, hundreds of pallets	Site waste handling and labour	Strong case: fewer cartons to dispose of, faster depalletising
High-humidity or dusty destination	Contamination and rework	Strong case, independent of trip count

Bringing it together

Photovoltaic packaging rewards a slightly unfashionable kind of thinking: work out what actually fails, then buy the cheapest thing that addresses that failure and nothing else. On that test, moulded EPP is the right material for corners that must survive many trips, for edges that must not shed beads onto a laminate, for module-level electronics that need a real cavity, and for inverter bases that must carry mass without touching a heatsink. It is the wrong material for long spans, for moisture barriers, for months in the sun, and for the cheapest possible one-way carton.

The rest of the design is geometry and discipline: short spans, relief pockets where something protrudes, three-face engagement at corners, load paths that avoid delicate features, and a test plan agreed before the tool is cut. None of that is exotic, and all of it is cheaper than a warranty claim on a roof.

Frequently asked questions

Do solar panels need foam packaging at all?

Not as a crate, no. Large modules travel safely in a rigid frame with a corrugate sleeve, and the foam's job is limited to corner and edge protection, rear-face relief around the junction box, and interleaving to stop abrasion. Foam used as the primary structure over a 2 m span will deflect, and deflection is what cracks cells.

Can solar modules be shipped vertically instead of flat?

Both orientations are used, and the choice is a trade between bending and stability. A vertical pack puts the module on its edge, which reduces self-weight bending but concentrates load on the 3 mm glass edge and makes the load far easier to tip; a horizontal stack spreads load but accumulates it through the stack. The decision belongs with the frame and pallet design and should be validated by transport test, not chosen by preference.

What causes micro-cracks in modules that arrive looking perfect?

Bending and repeated vibration, mostly. Road and rail excitation flexes the laminate; stack settling adds quasi-static load; the cells crack along busbars and fingers. Because the glass and frame stay intact, the damage is invisible without electroluminescence imaging, which is why a visual goods-in inspection cannot measure packaging performance.

Is EPP better than EPS for module corner protection?

For this application, usually yes, for two reasons that have nothing to do with cushion curves. EPS crushes permanently on the first significant impact, so it cannot be reused, and it sheds beads that are electrostatic, hard to remove and unwelcome anywhere near a laminate or a junction box. EPP recovers, survives multiple trips and does not shed.

Can EPP foam be used inside inverter cartons?

Yes, with one absolute rule: no load through the heatsink. Fins deform and close under sustained pressure, and the unit then derates for its whole service life. Load the chassis edges and mounting flange, cut a clearance pocket over the entire fin field, and check creep at container temperature rather than at room temperature.

Which standard should photovoltaic packaging be tested to?

For the packaged module unit, IEC 62759-1 is the reference that specifically addresses transportation of module package units. Around it, IEC 60068-2-6, -27 and -64 provide the vibration and shock methods, ISTA 3E covers unitised loads and ISTA 3A covers parcel-shipped electronics, and ASTM D4169 offers a distribution-cycle framework. Agree the severity and the acceptance criteria in writing, and confirm current editions with your test house.

Designing packaging for a photovoltaic or inverter line?

Send us the module or unit drawing, the pallet pattern and the lane — we will tell you which parts should be moulded EPP, which should not, and what the transport test should prove before you commit to a tool. Browse our packaging work or get in touch directly:

Contact us for a packaging review EPP cushion packaging solutions EPP foam packaging for flat panel products High-density EPP packaging box Rigid EPP case for long-format products Custom die-cut foam inserts EPP foam RFQ checklist (previous guide)EPP foam recycling and closed-loop recovery