Every week someone buys laminating pouches without checking the gsm and ends up with either floppy, easily bent laminates — or pouches so thick their machine won't accept them. This guide stops that from happening.
In this guide
What does gsm actually mean in laminating pouches?
GSM stands for grams per square metre. In laminating pouches, it refers to the total weight — and therefore thickness — of both layers of film combined when the pouch is sealed around your document.
A higher gsm means a thicker, stiffer result. A lower gsm means a thinner, more flexible result. Neither is universally better — the right choice depends entirely on what you're laminating and how it will be used.
80gsm → everyday office documents | 100gsm → menus, instruction cards, frequently handled items | 125gsm → safety signs, outdoor-facing materials, high-use notices | 160gsm+ → ID cards, luggage tags, heavy-duty commercial use.
It's worth knowing that each film layer in an 80gsm pouch is 40 microns thick — because the gsm measurement covers both sides combined. So an 80gsm pouch means 2 × 40 micron film. A 125gsm pouch is 2 × 62.5 microns. This matters when comparing pouch specifications across brands, since some manufacturers describe pouches by total gsm and others by per-side micron thickness.
The gsm guide: every weight explained
Standard / everyday
The most common choice for general office use. Flexible enough to fold slightly if needed and thin enough to feed smoothly through most laminators.
- Internal office notices
- Checklists and procedure cards
- Staff ID cards (light use)
- Curriculum documents
- Everyday A4 documents
Medium-duty / professional
Noticeably firmer than 80gsm with a more professional feel. Holds its shape well when picked up and handled regularly.
- Restaurant and café menus
- Instruction and reference cards
- Healthcare patient information
- Retail pricing and product cards
- Training room materials
Heavy-duty / long-life
Rigid and durable. Documents laminated at 125gsm withstand significant daily handling without bending or creasing.
- WHS and safety signage
- Point-of-sale materials
- High-traffic notice boards
- Construction site documents
- School classroom displays
Rigid / commercial-grade
The stiffest laminate available. Produces a card-like result suitable for items that need to stand up to continuous, intensive handling.
- ID cards and passes
- Luggage and key tags
- Membership cards
- Commercial price tags
Does gsm affect how long the laminate lasts?
Yes — but not as much as the quality of the film itself. A quality 80gsm GBC pouch will outlast a cheaper 125gsm generic pouch. Always buy branded pouches from reputable manufacturers (GBC, Rexel, Fellowes) where the film is consistent in quality and thickness. With cheaper alternatives, what's printed on the packet often doesn't match what's in it.
A4 vs A3 — and other size considerations
Laminating pouches are sized to fit the document — with a small border of film around the edge that seals the document in place. The pouch always needs to be slightly larger than the document itself.
| Pouch size | Document fits | Common uses | Notes |
|---|---|---|---|
| A4 Most common | Up to 210 × 297mm | Standard documents, notices, certificates, menus | Works in most office laminators |
| A3 | Up to 297 × 420mm | Posters, maps, plans, large signage, display materials | Requires an A3-capable laminator |
| A5 | Up to 148 × 210mm | Half-page notices, recipe cards, small instruction cards | More economical for small items |
| Credit card / ID | 54 × 86mm approx | Staff ID, loyalty cards, membership passes | Use with ID card pouches or a card laminator |
Always leave a border
The film seal at the edge of a laminating pouch is typically 3–5mm wide. If your document fills the pouch right to the edge, there's no sealed border and the pouch may open or peel over time. Always use a pouch that's at least 5–8mm larger than your document on each side — and trim afterwards if needed.
Matching your pouches to your laminator
Not all laminators accept all pouch weights. This is the most common source of laminating problems in Australian offices — the wrong combination of machine and pouch causes jams, uneven sealing and poor results.
| Laminator type | Pouch weights accepted | Max size | Typical use |
|---|---|---|---|
| Entry-level office (e.g. GBC Fusion 1000L) | 80gsm – 100gsm | A4 | Occasional office use, low-volume |
| Mid-range office (e.g. GBC Foton 30, GBC Fusion 3000L) | 80gsm – 125gsm | A4 / A3 | Regular daily use, mixed gsm needs |
| Heavy-duty / commercial (e.g. Rexel Ultima 65 A3) | 80gsm – 160gsm+ | A3 and beyond | High-volume, large format, all gsm weights |
| Autofeed laminator (e.g. GBC Foton 30) | 80gsm – 125gsm hands-free | A4 | High-volume A4 without manual feeding |
Using the wrong pouch weight is the #1 cause of laminator jams
If your laminator specifies a maximum of 125gsm, do not use 160gsm pouches. The machine's rollers aren't designed for the added thickness and will either jam, produce an uneven seal, or damage the heating element. Check your laminator's manual for the specified pouch weight range before buying in bulk.
Which pouches do different industries typically use?
The five most common laminating pouch mistakes
Using the wrong gsm for the machine
Always check your laminator's accepted weight range before ordering pouches in bulk. Ordering 500 pouches your machine can't process is an expensive lesson.
Not allowing the machine to warm up fully
Most laminators need 3–5 minutes to reach operating temperature. Feeding pouches through before the machine is ready produces a poor or incomplete seal. Wait for the ready indicator — always.
Inserting the open edge first
The closed (sealed) end of the pouch should enter the laminator first — this prevents the document from shifting inside as it feeds through. Closed end in, open end last.
Buying generic unbranded pouches
Generic pouches have inconsistent film thickness, uneven adhesive and a significantly higher jam rate. The machine downtime from a jam costs more than the pouch saving. Stick to GBC, Rexel or Fellowes.
Storing pouches incorrectly
Laminating pouches stored in heat, sunlight or humidity can pre-activate and stick together before use. Store flat, in original packaging, in a cool dry area away from windows.
Shop laminating pouches by weight
GBC, Rexel and Fellowes laminating pouches in all weights and sizes. Free delivery on orders over $99 Australia-wide.
