Pallet Load Protection: The Complete Guide

Published 26 October 2026 · By Ranjeet Kumar, Proprietor, Solution Enterprises

Short answer: pallet load protection is the set of materials and methods that keep a palletised load square, intact and in one piece from the packing line to the consignee. In practice it has four layers: a sound pallet, edge protectors on the corners, strap or stretch wrap that holds the cartons to the pallet, and — for road and sea transport — separate securing that holds the pallet inside the truck or container. Each layer stops a different failure, so leaving one out is rarely made up by doing more of another.

This guide starts from how loads fail and matches each failure to the protection that stops it. We make paper angle boards, honeycomb paper pallets and PET strap in Greater Noida, and we say plainly where film, timber or plastic is the better answer.

At a glance: failure, cause and fix

Failure	Usual cause	Protection	Read more
Corner crush	Stacking load on weak carton corners	Full-height edge protectors	Stacking strength
Strap cut	Strap bearing on a bare carton edge	Edge pieces under every strap	How many boards
Load lean	Loose strap, too little film, tall narrow load	PET strap, more containment, vertical boards	How many straps
Layer shift	Film not locked to the pallet	Film rope below top deck boards	Boards with wrap
Damp board	Humid storage, wet docks	Dry storage, stock rotation	Monsoon humidity
Pallet break	Pallet rated below the load or point load	Pallet matched to load and handling	Pallet capacity
Box shift	Pallets not blocked or lashed in the container	Blocking, lashing, void fill	Sea freight packing
Port hold	Untreated timber in the pack	ISPM 15 wood, or no wood	ISPM 15

How pallet loads fail

A pallet that arrives damaged has nearly always failed in one of four ways. Naming the failure correctly matters, because the fix for one can make another worse. Pulling a strap tighter to stop a load leaning, for example, is exactly what crushes the top cartons.

Compression

When pallets stack, the upper pallet’s weight travels down through the cartons below. A carton carries most of it in its corners, so the bottom layer fails at the corners first. Time makes it worse: a box that holds a load for an hour can sag under it over a week.

Strap crush

A tensioned strap presses on a narrow line. Where it turns over a carton’s top edge, that force bites into the corner, splitting the carton and letting the strap go slack as it sinks in.

Shift and lean

Braking, forklifts and a rolling ship push the load sideways. If cartons are not held to each other and to the pallet, layers slide and the stack leans. Tall, narrow and slippery loads fail this way first.

Moisture

Paper and board take up water from the air and lose compression strength as they do. A load that is fine in February can buckle in August with nothing else changed, because cartons and boards weaken together.

Each failure costs more than the goods: a replacement despatch, a credit note, time on the claim. See what transit damage really costs.

Edge protectors: the first layer of pallet edge protection

An edge protector is a rigid strip, usually an angle, along an edge of the load. A paper angle board is laminated kraft paper formed into a profile. On a pallet it spreads strap and film pressure, turns four weak carton corners into four columns, and takes the knocks. Plastic and foam suit other problems, as we compare in paper vs plastic vs foam corner protection. Do not confuse a long edge board with a small corner cap that covers one point — the difference is explained in edge protector vs corner protector.

Shapes

• L-profile — the standard for square carton corners on a pallet.
• U-profile — caps a flat edge, such as a bundle of sheets, glass or panels.
• V-profile — for tapered or chamfered edges.
• Wrap-around — one scored board that runs round the whole perimeter of a layer.
• Self-adhesive L — stays in place on its own until the strap or film arrives.

Which one fits which load is covered shape by shape in L, U, V or wrap-around.

Sizing

Size a board in order. Leg width follows the strap width and position. Thickness follows load weight and, above all, how many pallets stand on top. Length follows load height, deck to top. Board thickness is built from ply count and paper weight, and two boards of the same thickness can behave differently; angle board GSM and ply explained shows why. The full method is in how to choose edge protector size, and our edge protector size calculator gives a starting point from your pallet and load dimensions.

How many

Start with four, one per vertical corner, then add a short piece wherever a strap crosses a top edge. Two straps one way usually means four vertical boards and four top pieces. The working is in how many edge protectors per pallet.

The usual mistakes are simple: boards on two corners only, boards shorter than the load, legs narrower than the strap, damp storage. There is a full list in common edge protector mistakes, and our range is on the paper angle board page.

Strapping: holding the load to the pallet

Strap ties the cartons to the pallet so the load moves as one block. Edge protectors and strapping work as a pair: the board protects the carton from the strap, and the strap holds the board on.

PET, PP or steel

Strap	Best for	Watch out for
PET	Medium to heavy pallets, long transit, export	Needs tools matched to its width
PP	Light cartons, short local runs	Loses tension over time under load
Steel	Very heavy, hot or sharp-edged loads	No recovery, rust, cut hazard

The key difference is what happens after the load settles. A pallet compresses slightly in the first hours of transit. PET has elastic recovery, so it pulls back and stays tight; steel does not stretch back, so it simply goes slack against the lower stack. PP stretches more and holds tension less well over a long journey. The trade-offs are covered in detail in PET strap vs PP strap and PET strap vs steel strap. We make PET strap only; the sizes are on our PET strap page.

Tension and sealing

The joint is the weakest part of any strap. A serrated metal seal crimped by a matching sealer, or a friction weld from a battery tool, holds only part of the strap’s own strength, so tensioning beyond what the joint can carry gains nothing. Tension until the load stops moving and the strap sits flat on the boards — not until the top cartons dent. The steps are in how to tension and seal PET strap.

How many straps

Two straps through the fork openings is the usual minimum for a carton pallet. Heavier loads, slippery cartons, tall narrow stacks and weaker joints all call for more, and a tall load often needs a strap in each direction. The number should come from the strength the joints can hold against the load, with a margin — the method is set out in how many straps per pallet.

Stretch wrap with edge protectors

Stretch film holds the load by squeezing it. Lantech, a stretch-wrapper maker, calls this squeeze containment force and describes it as the film’s wrap force multiplied by the number of revolutions, measured at the top, middle and bottom of the load. Film is good at holding many small cartons together and keeping dust and splashes off. It is less good at resisting a heavy load leaning, and its squeeze lands hardest on the four corners — exactly where cartons are weakest when stacked.

That is why film and edge protectors suit each other. Stand the four vertical boards on the corners before the first revolution, hold them until the film has made a turn or two, and wrap upwards over them. The boards spread the film’s squeeze along the whole corner and add column strength; the film holds the boards in place. Lantech also warns that wrapping film right down over the pallet base lets fork tines puncture it. Their suggestion is a rope of film run just below the top deck boards, which locks the load to the pallet and stays clear of the forks. More detail is in edge protectors with stretch wrap.

Film, strap or both? A light, single-stacked load is often fine with film and boards. A heavy, tall or double-stacked load needs strap over boards too. We do not make stretch film; it is here because the guide would be incomplete without it.

The pallet itself

A pallet that cracks or sags takes the whole load with it. Choose its material, size and rating deliberately.

Paper, wood or plastic

• Wood — strong, repairable and widely available. For export it must meet ISPM 15.
• Plastic — durable and washable; suits closed loops where the pallet comes back many times.
• Paper (honeycomb) — light, one-way and recyclable with the cartons. Not made of wood, so not inside ISPM 15. It must be rated for the load and kept dry.

Paper pallet ratings have their own vocabulary — static, dynamic and racking loads mean very different things — explained in honeycomb paper pallet load capacity. For the comparison against plastic, read paper pallet vs plastic pallet, and see our paper pallet page for what we make.

ISPM 15 in one paragraph

ISPM 15, the international standard published under the IPPC, covers wood packaging material made from raw wood, including dunnage. Such wood must be treated and marked under the standard. Processed wood such as plywood is outside its scope, and so is paper. Untreated timber anywhere in the pack can get a well-protected shipment held at port. The full picture is in ISPM 15 explained for Indian exporters.

Sizes

ISO 6780:2003 sets out the principal dimensions of flat pallets for intercontinental handling and lists six plan sizes. The pallet size decides the board lengths, the strap girth and how many pallets fit a container floor, so choose it first. Indian and export sizes are compared in standard pallet sizes in India and for export.

Export and container loads

This is where the most expensive misunderstanding sits. The CTU Code — the code of practice for packing cargo transport units published jointly by the IMO, ILO and UNECE as MSC.1/Circ.1497 — describes three ways to secure cargo. Direct securing uses blocking, lashings or shores. Friction securing uses tie-down lashings that press the cargo onto the floor. The third, compacting cargo by bundling, strapping or wrapping, is in the Code’s own words an auxiliary measure that should always be combined with one of the other two.

Strap and film hold the pallet together; they do not hold it in place in the container. That needs tight stowage, filled gaps and lashing where a pallet could slide or tip. The Code says the total of void spaces in any horizontal direction should not exceed 15 cm, and that gaps between pallets need not be filled only if the pallets are stowed tightly and cannot tip. It also warns that bad weather at sea can fatigue shrink film.

The Code backs edge protection directly. It states that lashing strength figures assume smooth or smoothed edges, that sharp edges and corners reduce them substantially, and that edge protectors should be used wherever practicable. The full stuffing method is in how to pack pallets for sea freight containers, and the strap side of it is in PET strap for export containers. If you are working out how many pallets fit a box, our container load calculator helps.

Monsoon and humidity

Studies of corrugated boxes, including a 2019 Clemson University thesis, found that compression strength falls as relative humidity and moisture content rise. The CTU Code adds two thresholds for the inside of a closed container: from about 40% relative humidity the risk of corrosion on ferrous metal starts to rise, and from about 75% the risk of mould on organic materials such as wood, textiles and foodstuff increases. A container stuffed on a humid afternoon carries that air with it.

• Store angle boards, paper pallets and cartons off the floor, covered and away from dock doors.
• Buy closer to the point of use in the wet months, and rotate stock first-in, first-out.
• Allow more strength margin in stacked loads during the monsoon.
• Do not stuff a container in the rain. Check that the floor and any dunnage are dry.
• Avoid steel strap on bright or painted goods for humid routes; rust stains do not wash off.

The detail for boards is in edge protectors in monsoon humidity, and the wider plan — metal, cartons and condensation — is in packaging for monsoon season in India.

Testing before you change anything

A drop test lets the package fall on its faces, edges and corners to stand in for rough handling. A compression test squeezes it between two plates to find the stacking load it carries. Common methods include ASTM D5276 and ISO 2248 for drops and ASTM D642 and ISO 12048 for compression; ISTA publishes test sequences for whole shipments, including unitised loads. The basics are in drop and compression testing basics.

A lab test does not replace a trial on the real route: send a few pallets, photograph them on arrival, compare. Paper samples are conditioned before testing under ISO 187, so a lab figure says little about a board after weeks in a humid shed.

Writing it into a specification

Protection that lives in a supervisor’s head changes every shift. A written specification makes every packer build the same pallet and every supplier quote the same thing. How to structure one is in how to write a packaging specification.

Example specification (format only)

The figures below are invented to show the format. They are not a recommendation for your load and they are not our product data. Replace every value with your own after sizing and testing.

• Load: cartons of [product], gross load [kg] per pallet, load height [mm], stacked [1 or 2] high in transit.
• Pallet: 1200 × 1000 mm, [wood ISPM 15-marked / plastic / honeycomb paper], rated for the load above.
• Load pattern: column-stacked, no overhang, top tier level; tie sheet every [n] layers.
• Vertical edge protectors: paper L-profile, 4 per pallet, legs [mm × mm], thickness [mm], length = load height minus [mm].
• Top edge protection: 4 short L-pieces, [length] mm, one at each strap crossing.
• Strap: PET, [width × thickness] mm, embossed; [2] straps through fork openings, [n] straps in the other direction.
• Joint: friction weld with [tool], or serrated seal [size] with matching sealer.
• Tension: strap flat on boards, no dent in top cartons; checked by [method].
• Stretch film: [n] base wraps with film rope below top deck boards; 50% overlap; [n] top wraps.
• Storage: boards and paper pallets kept covered, off the floor, first-in, first-out.
• Container: pallets stowed tight; voids filled; lashing where any pallet can tip; container dry before stuffing.
• Checks: [n] pallets per shift inspected against this sheet; photos of each export container before closing.
• Revision: version [n], date [dd mm yyyy], approved by [name].

Cutting cost without more damage

The cheapest board is rarely the cheapest pallet. Cost per pallet is material, labour, freight space and damage. Savings come from fewer board sizes, the right strap width, faster packing and fuller pallets — not thinner materials everywhere. Change one thing at a time and watch claims before the next. The method is in how to reduce packaging cost without more damage.

Myths vs facts

Topic	Myth	Fact
Tension	Tighter strap means a safer load.	Past the point where the load stops moving, extra tension crushes cartons and strains the joint.
Film	More film layers replace edge boards.	Film adds squeeze, not column strength. Boards carry stacking load; film cannot.
Container	A well-strapped pallet is secured for sea.	The CTU Code calls strapping auxiliary; pallets still need blocking or lashing.
Corners	Two boards on the front corners are enough.	Load and strap act on all four corners; the bare ones fail first.
ISPM 15	Any pallet needs fumigation for export.	ISPM 15 covers raw-wood packaging. Paper and plywood are outside it.
Weather	Paper boards are fine if they never get rained on.	Humid air alone lowers paper stiffness; storage matters too.

Common questions

What is the best way to secure a pallet load?

Build the load square on a sound pallet, put edge protectors on all four vertical corners, then hold the cartons to the pallet with PET strap, stretch film or both. For road and sea, secure the pallet in the vehicle or container as well.

Do I need edge protectors if I use stretch wrap?

For light, single-stacked loads, film alone can be enough. If pallets stack, travel far or carry strap, use boards: film squeezes the corners and does not add column strength.

How long should a vertical edge protector be?

From the pallet deck to the top of the load, or a few millimetres short. A board that stops low leaves the top tier bare.

Is PET strap strong enough to replace steel?

For most palletised freight, yes, and it stays tight as the load settles. Very heavy, hot or sharp-edged goods may still need steel.

How many straps does a pallet need?

At least two through the fork openings for a typical carton load, more for heavy, tall or slippery loads. Work it out from joint strength against load weight with a margin.

Should the strap go over or under the edge protector?

Over it. The board sits between the strap and the carton so the strap bears on the board, never on a bare carton edge.

Are paper pallets strong enough for export?

Within their rating, yes. Check static, dynamic and racking ratings separately, watch point loads, and keep them dry.

Do paper pallets need ISPM 15 treatment?

No. ISPM 15 covers wood packaging made from raw wood. A paper pallet is not wood packaging, though any timber dunnage packed alongside it is.

Does strapping secure a pallet inside a container?

No. Under the CTU Code, strapping and wrapping are auxiliary. Stow pallets tight, fill voids and lash where needed so the pallet itself cannot slide or tip.

Why do loads fail more in the monsoon?

Paper and board absorb moisture from humid air and lose compression strength, cartons and boards together.

Can edge protectors be reused?

A board that is straight, dry and undamaged can go on another load in-house. A bent or wetted one goes to paper recycling.

What should I send when asking for a quote?

Pallet size, load height and weight, how high pallets stack, strap width, route and monthly quantity. With those we can suggest board sizes; send them through our request a quote form.

Sources

• IMO / ILO / UNECE, Code of Practice for Packing of Cargo Transport Units (CTU Code), MSC.1/Circ.1497 — Annex 7 section 4.1.3 (securing principles; compacting as auxiliary), sections 2.3.6–2.3.7 (void spaces, pallets and shrink foil), section 2.4.3 (sharp edges, edge protectors); chapter 2 definitions (corrosion and mould growth thresholds).
• International Maritime Organization, CTU Code overview page — joint IMO/ILO/UNECE code, non-mandatory.
• International Plant Protection Convention, ISPM 15: Regulation of wood packaging material in international trade — scope (raw wood, dunnage; processed wood such as plywood excluded).
• ISO 6780:2003, Flat pallets for intercontinental materials handling — Principal dimensions and tolerances.
• Lantech, Quick guide to stretch wrapping — containment force; film cable below the top deck boards.
• G. A. Brown, Relative Humidity Effects on the Compression Strength of Corrugated Boxes, MS thesis, Clemson University, 2019.
• Georgia Institute of Technology, Effects of moisture content on box compression strength.
• ISO 187, Paper, board and pulps — Standard atmosphere for conditioning and testing.
• ASTM D5276 and D642; ISO 2248 and ISO 12048; International Safe Transit Association (ISTA) test procedures.

Last verified: 26 October 2026. General guidance, not a load-securing calculation for a specific shipment. Size materials and securing for your own load and route, follow your carrier’s and destination’s rules, and test before changing a working pack.