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When you order custom greaseproof paper, the spec sheet asks you for a weight — a number in gsm — and it is the one line most buyers guess at. Pick too light and a burger wrap tears in someone’s hands; pick too heavy and you are paying for stiffness a pastry never needed, and fighting paper that won’t drape. Weight, or grammage, is the quiet variable that decides how your printed sheet feels, folds, and holds up in service. Here is what gsm measures, what weight each job actually calls for, and the one thing gsm does not tell you.

What gsm actually measures

GSM stands for grams per square metre: the weight of a single square metre of the paper. It is a density-of-sheet figure, not a thickness or a quality grade. A 40 gsm sheet weighs 40 grams per square metre; an 80 gsm sheet weighs twice that for the same area. Because it is measured per unit area, gsm lets you compare a small deli square and a large butcher sheet on equal terms — the number describes the stock, not the cut size. Higher gsm generally means a stiffer, stronger, more substantial sheet; lower gsm means a lighter, more flexible one that drapes and wraps easily. That single trade-off, stiffness versus drape, is most of what the weight decision comes down to.

The weight your job actually needs

Different jobs sit in different weight bands, and the ranges are well established across the industry. The lightest papers, roughly 25 to 38 gsm, are the tissues and interleaving sheets that separate pastries or line a deli case — they need to be thin and flexible, not strong. Basket liners for fries and bread service run a little heavier, around 35 to 50 gsm, enough to hold shape in a basket without becoming board-like. Pastry wraps and bakery sheets land near 40 to 55 gsm. Sandwich and burrito wraps, which get folded, tucked, and handled, sit in a 50 to 70 gsm standard band. Heavier still are butcher and kraft wraps for burgers and hot messy items at roughly 60 to 90 gsm, and takeout bags, which need real structural strength, at 80 gsm and up.

The pattern is intuitive once you see it laid out: the more a sheet has to physically hold, fold around, or carry, the heavier it goes. A useful shorthand is to think in three bands — light stock under 50 gsm for lining and separating, a standard 50 to 70 gsm for wrapping, and heavy 80 gsm-plus for structural jobs. Land in the right band first, then fine-tune within it based on how the paper feels in your hand.

The mistake: weight is not grease resistance

Here is the trap that catches more buyers than any other. It is easy to assume that a heavier, thicker-feeling sheet must resist grease better — and it is simply not true. Grease resistance comes from the barrier: a coating or a densely refined fiber structure that oil cannot penetrate, measured on a separate scale (the Kit level). Weight comes from how much fiber is in the sheet. The two are set independently at the mill. A heavy, substantial-feeling sheet with no barrier treatment will soak through with oil just as fast as flimsy paper, and a light, thin sheet with a good barrier can shrug off a greasy fry for the whole meal.

Specify the two things separately. Choose the weight for the physical job — how the sheet needs to feel and fold — and choose the grease barrier for the food — how oily it is and how long it has to sit. If you only tell a supplier “make it heavy so it doesn’t soak through,” you may get a stiff sheet that still fails, because you asked the wrong specification to do the barrier’s job. Knowing that these are two different knobs is the single most useful thing on this page.

What heavier paper buys you, and what it costs

Assuming the barrier is handled, going heavier does buy real things: more rigidity, better tear resistance, and a more premium hand-feel that signals quality when a customer unwraps their order. That is why a sit-down burger joint might choose a substantial kraft wrap while a bakery reaches for a light tissue. But weight is not free. More grams per sheet means more raw material per sheet, so heavier stock generally costs more per piece and adds up across a large run. It also means more weight per case, which raises freight, and fewer sheets in the same storage footprint. And past a point, extra weight actively hurts: a stiff sheet won’t drape cleanly around a soft item or fold into a neat sandwich pocket. The goal is the lightest weight that still does the job confidently, not the heaviest you can justify.

Specifying weight on your order

When you place a custom order, name the gsm explicitly rather than describing the paper as “thick” or “sturdy,” which mean different things to different mills. Tell the supplier the application — deli sheet, basket liner, sandwich wrap, takeout bag — and either the exact gsm or the weight band you want, and pair it with the grease barrier the food requires. If you are unsure, ask for a sample swatch at two adjacent weights and handle them before committing, since the difference between, say, a 50 and a 60 gsm wrap is easy to feel and hard to picture from a number. Getting the weight right on the front end means your printed paper looks the part, behaves the way your staff expect at the counter, and doesn’t cost you a cent more than the job actually needs.

Printing “recyclable” or “compostable” on a deli sheet or basket liner is one of the easiest ways to strengthen a food brand’s green credentials, and one of the easiest ways to make a claim that quietly does not hold up. Whether your custom greaseproof paper can actually be recycled or composted after a customer is done with it is decided almost entirely by two things: the coating on the paper, and how greasy the sheet is when it hits the bin. Get either wrong and the claim on the packaging is, at best, wishful. Here is what is true for each type, and how to specify an order whose environmental label survives a second look.

Why grease is the enemy of recycling

The instinct is that paper equals recyclable, but food packaging breaks that rule. Recycling mills turn paper back into fiber by pulping it in water, and oil does not mix with that process. Food oils, grease, and non-stick coatings cannot be separated from the paper fibers during pulping, and a heavily soiled batch can contaminate the pulp badly enough to ruin an entire run of recycled paper. That is why most municipal recyclers reject visibly greasy paper outright. A clean, unused offcut of genuine greaseproof paper is recyclable like any other paper, but the used sheet that wrapped a burger is not, no matter what the roll it came from was made of.

This is the single most common gap between a printed claim and reality. If your sheets are used for fried food, deli items, or anything oily, “recyclable” describes the paper you shipped, not the paper your customer throws away. For food-contact use, composting is almost always the more honest environmental route than recycling.

Composting is where greaseproof paper can genuinely win

The good news is that the grease which ruins recycling is a non-issue for composting. Commercial composters routinely accept food-soiled paper — pizza boxes, napkins, plates — precisely because their high heat breaks it down and the food residue is just more organic matter. The catch is that only some greaseproof papers are compostable at all, and it comes down to the coating.

Uncoated or “genuine” greaseproof paper — the kind that resists grease through mechanical refining of the fibers rather than a surface coating — is the strong performer. It is made of natural fibers, and when shredded and mixed into a carbon-rich pile it breaks down in roughly 30 to 90 days under good conditions. That makes it a candidate for both home and industrial composting. Silicone-coated paper is a different story: the silicone is heat-resistant and inorganic, so in a backyard pile the paper vanishes but the silicone remains as micro-residue, which is why it is not considered home compostable and is accepted only by some industrial facilities. PE (plastic)-coated and traditional wax (paraffin) papers fail on both counts — the plastic or petroleum wax neither composts nor survives the recycling pulper — and generally belong in the trash.

What the compostable standards actually require

If you want to print the word “compostable,” it helps to know what a certifier is testing for, because the term is standards-based rather than a general description. In the United States the reference standard for industrial composting is ASTM D6400, and it is stricter than most people assume. To pass, a material must biodegrade at least 90% into carbon dioxide within 180 days, and it must physically disintegrate within about 84 days so that what remains passes through a 2mm sieve with no visible fragments. It must also leave compost that is not toxic to plants and does not carry heavy metals above tight limits.

Two details matter for a buyer. First, ASTM D6400 describes industrial composting, which runs hot — roughly 55 to 70°C — not the cooler, slower conditions of a backyard bin, which may take six to twelve months and often never reach the required heat. A separate certification, TÜV Austria’s OK compost HOME, covers home compostability and is the label to look for if you want to claim customers can compost the sheet at home. Second, the claim needs a certifier: ASTM writes the test, and an organization such as the Biodegradable Products Institute (BPI) verifies that a specific product passes and issues the certification, with re-certification typically every three years. “Compostable” without one of these certifications behind it is a term you should avoid on printed packaging.

Specifying an order whose green claim holds up

The practical path is to decide the claim first, then let it dictate the material. If you want to print compostable, order uncoated genuine greaseproof and ask your supplier which certification it carries — BPI or ASTM D6400 for industrial, OK compost HOME for home — and match your printed wording to that exact scope rather than a vague “eco” label. If your sheets need a moisture or grease barrier stronger than uncoated paper provides, a compostable bio-coating such as PLA can preserve the claim where a PE coating would destroy it, so specify the coating chemistry explicitly rather than accepting “coated” at face value. Confirm that your inks are suitable for food contact and compostable systems, since a heavy metallic or non-approved ink can disqualify an otherwise compostable sheet.

And keep the recycling language honest. Because your paper will usually be used with oily food, avoid a blanket “recyclable” claim and lean on the compostable message, which is both truer and more useful to the customer standing over the bin. The numbers here are indicative and depend on local facilities and conditions, so the safest wording points customers to “where accepted” composting rather than promising an outcome your supply chain cannot guarantee. Choose the coating to match the claim, back the claim with a real certification, and your custom greaseproof paper can carry an environmental message that stands up.

Four papers show up again and again in a food business: greaseproof, parchment, wax, and butcher paper. They can look almost identical stacked on a shelf, and they get swapped for one another constantly, usually by someone who then wonders why the sheet stuck to the pan or melted onto a brownie. They are not interchangeable. Each is built for a different combination of heat, grease, and moisture, and picking the wrong one is the difference between a clean release and a ruined tray. Here is what actually separates them and how to choose without second-guessing.

Greaseproof paper: the wrap-and-serve specialist

Greaseproof paper earns its name through how it is made, not through a coating. The pulp is heavily refined and calendered so the fibers pack tightly, forming a natural barrier that oil struggles to pass through. That means no wax, no silicone, and a clean, food-safe surface that takes printing well, which is why it is the standard for branded deli sheets, basket liners, sandwich wraps, and takeaway. The trade-off is that the barrier is physical, not chemical: over long contact with very wet or very oily food it will eventually absorb some moisture, and it is not designed for sustained oven heat. Weights are typically light, often in the rough range of 30 to 50 gsm depending on the format, though that figure is indicative and varies by supplier. If your job is to hold, wrap, line, and brand food at serving temperature, this is the paper built for it.

Parchment paper: the one built for the oven

Parchment is the paper you bake on, and the reason is a food-safe silicone coating bonded to treated cellulose fibers. That coating does two things greaseproof cannot: it releases stuck food cleanly and it tolerates real oven heat, commonly rated to around 425 to 450°F (about 232°C). Cookies lift off without tearing, roasting vegetables do not weld to the tray, and cleanup is trivial. What parchment is not is a branding surface. The silicone that makes it non-stick also makes it a poor candidate for the kind of printed, under-the-food presentation greaseproof handles so well, and using it purely to wrap a cold sandwich is overkill you are paying for. Reach for parchment when the paper is going into the oven; skip it when it is not.

Wax paper: cold jobs only

Wax paper looks like a cheaper parchment and behaves nothing like it. Its slick surface comes from a paraffin wax coating, and paraffin softens and melts at low temperatures, well below baking heat. Put wax paper in a hot oven and the coating melts and can smoke, which is exactly why it belongs to cold and room-temperature tasks: separating burger patties or cookie-dough layers, wrapping a sandwich for a few hours, lining a container, rolling out candy. There is one narrow exception worth knowing: wax paper can line a cake or brownie pan if the batter completely covers it, because the food shields the wax from direct heat. Outside that specific case, treat wax paper as a storage-and-wrapping material and keep it away from the oven entirely.

Butcher paper: breathable, not grease-proof

Butcher paper is the odd one out, because it is not really trying to be a grease barrier at all. It is an uncoated, unwaxed kraft paper, and the pink or peach version that barbecue cooks favor is prized precisely because it is breathable. Wrap a brisket in it at smoker temperatures, commonly in the 250 to 275°F range, and steam escapes rather than pooling, so the bark stays firm while the meat keeps some moisture, something neither foil nor a coated paper can do. It is also the classic table covering and a sturdy wrap for cuts at the counter. What it will not do is stop grease the way greaseproof does; kraft fibers absorb oil, so a burger sitting on plain butcher paper will leave a spreading stain. Rolls are heavier stock, often around 60 gsm and sold in long widths like 18 inches by 175 feet. Choose it for smoking, resting meat, and covering surfaces, not for holding greasy food on a plate.

How to choose without overthinking it

Strip away the marketing and the decision comes down to a single question: what is the paper being asked to survive? If it goes in the oven, you want parchment for its silicone coating and heat rating. If the job is cold storage or separating layers, wax paper is the cheap, correct answer. If you are smoking or resting meat, or covering a table, butcher paper’s breathability is the whole point. And if you are wrapping, lining, or serving food at temperature, and especially if you want your logo under it, greaseproof is the printable workhorse that does that job better than any of the other three. The capability profile above lays the four side by side so the pattern is obvious: no paper wins every category, and the “best” one is simply whichever matches the task in front of you.

The common mistakes all come from ignoring that question. People bake on wax paper and get smoke, they wrap greasy food in butcher paper and get stains, and they pay for parchment to wrap a cold sandwich a plain greaseproof sheet would have handled for a fraction of the cost. Match the paper to the heat and the grease it will actually see, and each one quietly does exactly what it was designed to do.

Two shops can order the exact same custom greaseproof sheet — same 40 gsm stock, same 12″ × 12″ cut, same one-color logo — and pay wildly different prices, simply because one ran it digitally and the other ran it flexo. The print method is the single biggest lever on what a run costs and how fast it ships, and it is the one decision most buyers never actually make on purpose. This guide walks through the three methods you will be quoted on — digital, flexographic, and offset — and shows where each one wins so you can match the method to the job instead of taking whatever the supplier defaults to.

The three methods, and what actually separates them

Digital printing puts your artwork straight onto the paper with no physical plates, the same way a large-format office press would. Because there is nothing to tool up, setup cost is effectively zero and you can economically print a few hundred sheets. It handles full-color artwork, photographs, and gradients without extra charges, and it lets you change the design between runs at no penalty. The trade-off is the per-sheet rate: digital stays relatively flat as quantity climbs, so it never gets dramatically cheaper at scale.

Flexographic printing — flexo — transfers ink from a raised, flexible plate, one plate per color. It is the workhorse of food-paper printing because once the plates are made, the press runs fast and the ink cost per sheet is tiny. Flexo uses fast-drying, water-based food-safe inks formulated so the sheet does not go soggy, which is exactly what you want on a grease-facing surface. The catch is the plates: you pay to make them before a single good sheet comes off the press, and each additional color is another plate.

Offset printing transfers ink from a metal plate to a rubber blanket and then onto the paper. It produces the sharpest fine detail and the most consistent color of the three, which matters for intricate logos or tight brand-color matching. Like flexo it carries real plate and makeready costs, so it only makes financial sense on large runs where that setup is spread across a lot of sheets.

Where the money actually goes

The cost of a printed run has two parts that behave very differently: a fixed setup cost you pay once, and a per-sheet cost you pay on every unit. Digital shifts almost everything into the per-sheet number and charges nothing up front. Flexo and offset load cost into setup and then run cheaply. That single structural difference is why quantity decides the winner.

Setup is the part buyers underestimate. On flexo, plates commonly run in the range of roughly $50 to $200 per color, plus a plate-set or imaging fee often in the $150 to $300 band, so a simple one- or two-color job carries a few hundred dollars of tooling before you count paper. A four-color flexo job frequently lands somewhere around the mid-hundreds, and a six-color set can push past $1,000. Digital skips all of it. Offset setup is higher still and varies enough by press and format that any single figure is only a placeholder. The chart below shows the rough shape of that upfront cost by method — treat the numbers as indicative ranges, not quotes.

Now layer the per-sheet cost on top. Because flexo runs so cheaply once it is set up, its total cost per sheet keeps falling as the run grows, while digital flattens out. Below a few hundred to a couple thousand sheets, digital is usually cheaper overall because you are not paying for plates. Somewhere in the low thousands the two lines cross, and past roughly 5,000 sheets flexo pulls clearly ahead. The comparison below traces that crossover using published print-cost patterns; the exact dollar figures shift with sheet size and ink count, but the shape holds for greaseproof work.

Minimum order quantities set the floor

Method also dictates how small you are allowed to go. Digital’s plate-free setup means suppliers will often take orders starting around 250 sheets, which is what makes it viable for a new food truck testing a design or a caterer printing for a single event. Flexo minimums typically start higher — commonly around 500 sheets and often more — because a supplier will not tool up plates for a tiny run. Offset minimums are higher again. If you only need a few hundred branded sheets, the decision is effectively made for you: digital is the method that will accept the order at all. If your annual volume is in the tens of thousands, the minimums never bind and you should be choosing on per-sheet cost instead.

Color, detail, and lead time

Match the method to the artwork. A clean one- or two-color logo prints beautifully and cheaply on flexo, and that describes most deli-sheet and basket-liner branding. If your design is full-color, uses photographic imagery, or blends gradients, digital handles it without per-color charges and is usually the practical choice at small to mid volumes. When you need the crispest possible fine lines or an exacting brand-color match across a very large run, offset earns its setup cost.

Speed follows the same logic. Digital’s lack of tooling makes it the fastest to start, with production often quoted in the 3 to 5 business day range, while flexo more typically runs 7 to 10 days once plates are factored in. For custom greaseproof specifically, a common end-to-end window for printing and delivery is around 6 to 8 business days, though anything with new plates, multiple colors, or a large quantity can run longer. If a fixed event date is driving the order, confirm the lead time in writing before you commit, and remember that reordering the same flexo design later is faster and cheaper because the plates already exist.

A simple way to decide

Start with quantity, because it settles most cases on its own. Under about 1,000 sheets, or any time you want to test or frequently change a design, digital almost always wins on both cost and flexibility. Above roughly 5,000 sheets of a stable, simple design, flexo’s cheap per-sheet rate makes it the clear economic pick, and its food-safe, fast-drying inks are purpose-built for grease-facing stock. In the middle — very roughly 1,000 to 5,000 sheets — the two methods are close enough that color count, reorder plans, and lead time should break the tie: heavy color or a one-time run leans digital, while a simple design you expect to reorder leans flexo since you amortize the plates across future orders. Reserve offset for large runs where fine detail or exact color consistency genuinely justify the higher setup.

Whatever the method, hold two things constant: confirm the inks are water-based and food-safe for direct contact, and ask the supplier to state setup cost, per-sheet cost, minimum order, and lead time as separate line items. Once those four numbers are on the table, the right print method for your run tends to pick itself.

Greaseproof paper sits directly against food, which makes it a food-contact material and, since 2023, a regulated one in much of the country. Two separate questions decide whether a given sheet is fit for the job, and buyers often collapse them into one. The first is performance: does the paper actually stop grease from soaking through under your hottest, oiliest menu item. The second is compliance: is the paper free of the fluorochemicals that a growing list of states now ban in food packaging, and can the supplier show it meets food-contact rules. A sheet can pass one test and fail the other, so it pays to understand both before committing to a print run.

How grease resistance is actually measured

The industry does not grade greaseproof paper by feel, it grades it with the Kit test, standardized as TAPPI T559. The test applies a series of increasingly aggressive oil-and-solvent mixtures to the paper surface, and the paper’s rating is the highest-numbered solution that can sit on it for fifteen seconds without staining through. The scale runs from Kit 1, minimal resistance, to Kit 12, maximum resistance, so a higher number means a tougher grease barrier. The number you need is driven entirely by what the paper will hold. Dry and low-grease items such as bread, rolls, and plain pastries are served fine by roughly Kit 1 to 4. Moderately greasy foods, the sandwiches, burgers, and pizza slices that make up most counter service, generally call for Kit 5 to 7. Fried and high-fat foods such as chicken, wings, fries, and doughnuts push into Kit 7 to 9, with the upper end recommended when food sits in a warming drawer for half an hour. Heavily sauced items or long holding times are where Kit 10 to 12 earns its keep.

The practical error is to over-spec or under-spec. Buying Kit 12 paper for dry cookies wastes money on a barrier the food will never test, while wrapping fried chicken in a Kit 4 sheet produces exactly the grease-through that stains a customer’s hands and a branded bag. Match the rating to the greasiest thing the paper will actually touch, and account for how long the food sits before it is eaten.

The PFAS shift buyers cannot ignore

For decades, the cheapest way to hit a high Kit rating at low paper weight was to treat the sheet with per- and polyfluoroalkyl substances, the fluorochemicals known as PFAS. They are extremely effective grease barriers, and they are also persistent in the environment and the body, which is why regulators moved against them in food packaging specifically. The change has been rapid. A representative group of a dozen states, including New York, California, and Washington from 2022 and 2023, then Colorado, Maryland, Minnesota, and others through 2024 and 2025, now bans intentionally added PFAS in food packaging, and more have measures pending. At the federal level, manufacturers completed a voluntary phase-out of PFAS-based grease-proofing agents for paper and paperboard food packaging by early 2024, so those treatments are no longer being supplied into the U.S. market.

For a brand ordering custom greaseproof paper, the upshot is simple: PFAS-treated grease resistance is on its way out regardless of where you operate, and in many states it is already unlawful. Specifying PFAS-free is no longer a premium green choice, it is the baseline a compliant order has to meet.

How PFAS-free paper still stops grease

Removing PFAS does not mean giving up grease resistance, it means achieving it a different way. The most common route is mechanical: heavily refining and densifying the pulp so the sheet’s fibers pack tightly enough that oil cannot travel through, which is the principle behind traditional glassine and genuine greaseproof papers. The second route is a non-fluorinated barrier coating, such as water-based dispersion coatings, clay, silicone, or a thin poly layer, applied to the food-contact side. Each approach has trade-offs worth knowing. Densified papers keep the sheet fully paper-based and often recyclable or compostable, but very high Kit levels can require heavier stock. Coated papers can reach strong grease and moisture resistance at lighter weights, but a plastic or poly coating can complicate composting and recycling. When you ask a supplier for PFAS-free paper at a given Kit level, ask which method delivers it, because that determines both the feel of the sheet and its end-of-life options.

Food-contact and print compliance

Grease resistance and PFAS status are the headline issues, but a compliant sheet has to clear a few more. The base paper and any coating that touches food fall under the FDA’s food-contact rules for paper components, codified at 21 CFR 176.170, so a reputable supplier should be able to confirm the paper is manufactured to food-contact standards. Printing matters too: custom greaseproof paper should be produced with food-safe, low-migration inks, and good practice keeps heavy ink coverage on the side that does not contact the food wherever the design allows. If you intend to make a compostable claim, that is its own certification rather than a byproduct of being paper, and it typically means meeting a standard such as ASTM D6400 or D6868 and carrying third-party certification; a poly-coated sheet generally will not qualify. None of this requires you to become a materials expert, but it does mean the right questions to ask a supplier are specific: confirm PFAS-free status, state the Kit level your menu needs, request food-contact documentation, and clarify the ink and any compostability claims in writing.

Specifying a compliant order

Put together, a sound spec reads less like a wish and more like a checklist. Start from your greasiest, hottest item and pick the Kit level that survives it through your longest holding time. Require PFAS-free grease resistance as a non-negotiable, and ask whether it is achieved by densified fiber or a named coating so you understand the recycling and composting implications. Confirm the paper meets food-contact requirements and that your artwork will print in food-safe inks. Handling those four points before the press runs is what separates paper that merely looks the part from paper that holds the food, protects the brand, and keeps you on the right side of a fast-moving set of rules.