Extended-Core Stretch Film: Specifications, Uses and Buying Guide

Extended-core stretch film is hand stretch film wound on a core that extends past the edges of the roll, so the core itself works as a built-in handle. It is also sold as extended core pallet wrap or stretch wrap with handles. Operators take a roll out of the carton and start wrapping; there is no dispenser to buy or keep track of. It works well in warehouses that hand-wrap light to medium loads a few times a day. For heavy, irregular or high-volume pallets it is less suitable, because a reusable dispenser or a stretch wrapping machine gives better tension control.

We wrote this guide for two groups of readers: warehouse managers who wrap pallets by hand, and distributors who buy extended-core rolls in bulk. If you only need one part, the headings below are organized by the questions buyers ask us most often. Distributors comparing suppliers can also read our guide to pallet wrap suppliers for distributors.

What Is Extended-Core Stretch Film?

A standard hand stretch film roll is wound on a core that sits flush with, or only slightly beyond, the film edge. To use it comfortably, the operator holds the roll directly, slides on a pair of “hand savers,” or mounts it on a dispenser.

An extended-core roll is wound on a longer, usually narrower core that protrudes from both ends of the roll. The operator grips the exposed core ends with both hands, and the roll turns on the core as the film unwinds. When the roll is finished, the core goes into the recycling bin along with the carton.

How the extended core works as a built-in handle

• Grip: the protruding ends give each hand a fixed place to hold, so the palms stay off the moving film.
• Rotation: the roll spins freely as film pays out, so the operator can walk the pallet without fighting the roll.
• Tension: the operator applies tension by gripping more tightly or by pulling back against the roll. Because tension comes from hand friction, it is less consistent than on a dispenser with a brake.

Typical specifications at a glance

Specification	Common range (metric)	Common range (US)
Film width	300–500 mm (wider rolls exist)	12–20 in (up to 30 in)
Narrow banding widths	75–125 mm	3–5 in
Roll length	200–450 m	700–1,500 ft
Thickness	12–30 µm	47–120 gauge
Core extension	roughly 100–125 mm beyond the film	roughly 4–5 in beyond the film
Core diameter	narrower than a standard 76 mm (3 in) core	often around 1–1.5 in
Film type	cast or blown LLDPE	cast or blown LLDPE
Cling	one-side or two-side	one-side or two-side

Exact values vary by manufacturer, so always confirm them on the supplier’s specification sheet.

Extended-Core vs Standard-Core Hand Stretch Film

In most cases the film on both rolls is the same. The difference is in the core, which changes how the roll is handled, how much it weighs and what it costs.

Factor	Extended-core roll	Standard-core roll
Core	Longer and usually narrower; protrudes from both ends	Flush with the film edge; typically 76 mm / 3 in
Tools needed	None	Hand savers or a dispenser for comfortable use
Start-up cost	Lowest: buy film and start wrapping	Film plus a one-time tool purchase
Tension control	By hand grip; varies by operator	Better and more repeatable with a braked dispenser
Ergonomics	Good for short sessions; hands and wrists tire on long shifts	A dispenser reduces strain over a full shift
Width options	Also offered in wide formats (20 in / 500 mm and above)	Mostly up to 18 in / 450–500 mm
Core share of roll weight	Higher, because the core is longer	Lower
Cost per kg of film	Usually slightly higher	Usually lower
Waste	One core per roll, plus the carton	One core per roll; the tool is reused

In practice, you pay slightly more per kilogram of film and save on tools and set-up. That usually makes sense when wrapping is occasional or spread across many locations. When one team wraps pallets all day, standard rolls on a dispenser tend to be cheaper.

Extended-Core Rolls vs Standard Film with a Reusable Handle

Once a site’s wrapping volume grows, the question usually comes up: should it keep buying extended-core rolls, or move to standard rolls with a reusable handle or dispenser?

When extended-core rolls make more sense

• Wrapping is occasional. A few pallets a day, or wrapping done by staff who have other main jobs.
• Many wrap points. Docks, branches, trucks or field crews where dispensers would go missing.
• Mixed or temporary labor. No training on dispenser brakes or roll changes is needed.
• Light to medium loads. Cartons and uniform cases that need containment, not heavy load holding.
• Resale to small users. Distributors selling to customers who will not buy a dispenser.

When a reusable dispenser or hand saver is the better choice

• High volume. One or more operators wrapping for most of a shift.
• Heavy or unstable loads. Heavy or irregular pallets need consistent, higher tension and more stretch.
• Cost control per pallet. You want to use the least film per pallet, consistently.
• Ergonomics programs. Your site tracks hand and wrist strain or repetitive-motion injuries.
• Lower film price per kg. Standard rolls usually cost less per kilogram of film.

Cost per pallet: a simple comparison

Compare the two options on cost per pallet, not price per roll:

Cost per pallet = (film used per pallet ÷ net film weight per roll) × price per roll + tool cost per pallet

• Film used per pallet: weigh a roll before and after wrapping 10 pallets, then divide by 10.
• Tool cost per pallet: the dispenser price plus expected replacements over a year, divided by pallets wrapped that year. For extended-core rolls this is zero.

At low volumes the tool cost per pallet is high, so extended-core rolls usually win. As volume rises, the tool cost spreads thin, and the better tension control of a dispenser often reduces film use as well. The volume at which a dispenser starts to pay for itself depends on your loads, your operators and your film price, so run the numbers with your own trial data. Our guide to calculating stretch film usage and cost per pallet shows the method step by step.

Question	Extended core	Reusable handle or dispenser
Pallets per day per wrap point	Low to moderate	Moderate to high
Number of wrap points	Many, spread out	Few, fixed
Risk of tools going missing	High	Low
Need for consistent tension	Low to medium	Medium to high
Operator time spent wrapping	Short sessions	Long shifts

How to Specify Width, Thickness, Net Film Weight and Core Extension

Choosing film width for pallet height and load type

• 400–500 mm (16–20 in) is the workhorse width for pallet wrapping. It covers a standard pallet in fewer revolutions and is still easy to handle.
• Narrower rolls (300–380 mm / 12–15 in) are lighter, which helps with tall stacks, overhead reach and smaller operators.
• Wide rolls (up to 30 in / 750 mm) cover tall pallets in fewer passes but are heavy to hold by the core. Trial them before standardizing.
• Banding widths (75–125 mm / 3–5 in) are for bundling cartons, pipes, lumber or long items rather than full pallets.

Thickness: micron vs gauge conversion table

Europe usually specifies thickness in microns (µm); the US uses gauge. One micron is about 3.94 gauge. For a deeper look at matching thickness to load weight, see our stretch film thickness guide.

Microns (µm)	Gauge (approx.)	Typical hand-wrap use
12	47	Light, uniform cartons; cost-sensitive; often a high-performance or “equivalent” film
15	60	Light loads
17	67–70	Light to medium loads
20	80	General-purpose medium loads; the most common hand-film choice
23	90	Medium to heavier loads
30	120	Heavy loads, sharp corners, puncture risk

Two notes:

1. Thinner high-performance films, including pre-stretched film, can match the holding force of a thicker standard film. They are usually less forgiving on sharp corners and rough handling, though, so test them on your actual loads.
2. Cast vs blown: cast film is clearer, quieter to unwind and has good cling. Blown film is generally tougher and more puncture-resistant, at the cost of more unwind noise.

Net film weight vs gross roll weight (and why it matters)

Net film weight is the weight of film only. Gross roll weight includes the core. Because an extended core is longer than a standard core, it makes up a larger share of the gross weight. Two rolls with the same gross weight can therefore carry different amounts of film.

You can estimate net film weight from the nominal dimensions (LLDPE density ≈ 0.92 g/cm³):

Net film weight (kg) = width (m) × length (m) × thickness (µm) × 0.00092

Roll	Theoretical net film weight
400 mm × 300 m × 17 µm	≈ 1.88 kg
500 mm × 300 m × 20 µm	≈ 2.76 kg
18 in × 1,000 ft × 80 ga	≈ 2.60 kg (5.7 lb)
20 in × 1,000 ft × 80 ga	≈ 2.89 kg (6.4 lb)

Buyer checks:

• Ask for net film weight and core weight separately on the quote.
• Weigh a sample roll, then weigh the empty core after use. Gross minus core should land close to the theoretical figure.
• Compare offers on price per kg of film, or price per metre at a stated thickness, never on price per roll alone.

Core extension length, diameter and wall strength

• Extension length: the core should protrude far enough for a full grip with a gloved hand, commonly around 100–125 mm (4–5 in) beyond the film. Too short and knuckles rub the film; too long and the core can flex or snag.
• Diameter: a narrower core is easier to grip but must still be stiff enough not to bend. Ask for both inner and outer diameter.
• Wall strength: the core should not crush, flatten or delaminate during wrapping, or when cartons are stacked in transit. Ask how the core is protected in the carton.
• End finish: clean, smooth core ends reduce glove wear and hand discomfort.

Warehouse Trial Checklist: Grip, Unwind, Tension and Load Stability

A spec sheet tells you what a roll should do. A short trial on your own pallets, with the people who will use the film, tells you what it actually does. We recommend one before switching to any new extended-core film.

Trial setup: brief operators on correct pallet wrapping technique first, then use 2–3 operators, at least 10 pallets of your most common load type, and a scale. Record the roll weight before and after the trial.

Grip and handling

• The core ends are comfortable to hold with and without gloves
• The core does not flex, crush or slide out of the roll during use
• The roll weight is manageable for a full pallet without wrist strain
• Operators can start and finish the wrap without setting the roll down

Unwind behaviour

• The film unwinds smoothly with no jerking or sudden release
• Unwind noise is acceptable for the work area
• Layers do not block (stick together) on the roll
• The film tears off cleanly by hand at the end of the wrap
• No edge damage, gels, holes or breaks during the trial

If a trial roll tears, unwinds unevenly or won’t hold its tail, the hand stretch film troubleshooting guide helps find the cause.

Applying tension by hand

• Operators can apply visible stretch without the film breaking
• Neck-down (narrowing of the film as it stretches) stays reasonable
• The film clings to itself so the tail stays put
• Results are similar from operator to operator

Pallet stability checks after wrapping

• The top tier is locked to the load with an overlap at the top
• The load is tied to the pallet with extra wraps at the base
• A firm hand push on the upper corners shows little lateral movement
• The load arrives intact after an internal move or a test shipment
• Film used per pallet (kg or g) and wrapping time per pallet are recorded

What to compare: film weight per pallet, time per pallet, film breaks per roll and operator feedback. A roll that costs slightly more but uses less film per pallet, with fewer breaks, is usually the better buy.

For export or long-haul loads, also look at containment force and pallet stability. Some shippers also use transport stability test methods such as EUMOS 40509, but for most warehouses the in-house trial above is enough to make a decision.

Bulk Purchasing for Distributors: Packaging and Quote Fields

Packaging options

• Rolls per carton usually depend on width. Wide pallet rolls are often packed around 4 per carton; narrow banding rolls (3–5 in / 75–125 mm) often 12–18 per carton.
• Carton labeling: product name, size, thickness, net weight, batch number and barcode. Ask whether private labels or neutral cartons are available.
• Pallet pattern: cartons per layer, layers per pallet, maximum pallet height, and whether pallets are corner-boarded and wrapped.
• Container loading: pallets per 20 ft and 40 ft container, or floor-loaded carton counts if you do not need pallets.

Loading quantities vary with roll size and carton design, so ask your supplier for a loading sheet for each SKU before you build your price list. Once stock arrives, follow good stretch film storage practice so rolls keep their cling and unwind properly.

Quote checklist: fields to confirm before ordering

Group	Field
Film	Type (cast / blown), width, length, thickness (µm and gauge), color or tint, cling (one-side / two-side), stretch performance
Weight	Net film weight per roll, core weight, gross roll weight
Core	Inner and outer diameter, extension per side, material and wall thickness
Packing	Rolls per carton, carton size and gross weight, labeling or private label
Logistics	Cartons per pallet, pallet size and height, pallets or cartons per 20 ft / 40 ft container
Quality	Tolerances on length, thickness and weight; batch traceability; test report on request
Commercial	MOQ, unit price basis (per roll / per kg / per carton), Incoterms (EXW, FOB, CIF, DDP), payment terms, lead time
Samples	Sample rolls available, sample cost and shipping, how trial feedback is handled

Distributor tips:

1. Normalize every quote to price per kg of film. This exposes differences in roll length, thickness and core weight.
2. Match bulk to the approved sample. Keep a roll from the approved trial and agree before the first order that bulk production will match it.
3. Lock the core spec. A change in core length or wall thickness changes both the user experience and the gross weight.
4. Vet the supplier, not just the price. Our checklist on how to evaluate a stretch film manufacturer and our guide to importing stretch film from China cover audits, samples and shipping.
5. Order a trial quantity first, run the warehouse checklist above with a key customer, then scale up.

FAQ