Heavy paper that lets grease through is just expensive failure\u2014spec both weight and barrier.<\/strong><\/p>\n\n\n\n Food service operators and procurement managers choosing packaging paper will gain clarity on specification basics here, preparing them for the detailed GSM reference chart and supplier evaluation guidance that follows.<\/p>\n\n\n\n ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~<\/p>\n\n\n\n Two paper samples on the counter.<\/p>\n\n\n\n Choosing the right paper weight is a balance of tactile rigidity and cost efficiency. For sandwich wraps and basket liners, the decision starts with understanding GSM. <\/em><\/p>\n\n\n\n That uncertainty is familiar. You’re holding samples, staring at numbers, and wondering whether “heavier” means “better”\u2014or just “more expensive.” The truth is simpler than most suppliers make it sound: GSM tells you about weight and rigidity, not grease resistance. Once you separate those two decisions, choosing paper becomes straightforward.<\/p>\n\n\n\n GSM stands for grams per square meter. Imagine cutting a perfect one-meter-by-one-meter square from a roll of paper and placing it on a scale. The weight in grams is the GSM. A 40gsm sheet weighs 40 grams per square meter; a 60gsm sheet weighs 60 grams.<\/p>\n\n\n\n The measurement is standardized internationally. ISO 536<\/a> and TAPPI T 410<\/a> define exactly how to test grammage, which means suppliers worldwide use the same methodology. When a spec sheet says “60gsm tested per ISO 536,” you can compare it directly to another supplier’s 60gsm rating.<\/p>\n\n\n\n Think of it like comparing two blankets of identical size. The heavier blanket has more material packed into the same area\u2014it feels denser, more substantial. GSM works the same way for paper.<\/p>\n\n\n\n One clarification matters here: GSM is not thickness. Two papers with identical GSM can feel noticeably different in your hand. Fiber type, density, calendering, and coatings all affect how thick or stiff a sheet actually feels. GSM tells you the mass per area. It is a primary indicator of mass, though physical properties like tensile strength and stiffness are influenced by fiber orientation and bulk.<\/p>\n\n\n\n Some suppliers\u2014particularly in North America\u2014quote “basis weight” in pounds instead of GSM. Basis weight is calculated using ‘basis reams’ (typically 500 sheets) of a specific ‘trade size.’ Because trade sizes differ between paper grades (e.g., Bond vs. Text), a 50 lb Bond sheet is significantly heavier than a 50 lb Text sheet if they’re using different basis sizes.<\/p>\n\n\n\n Asking for the GSM equivalent is the clean way to compare paper weight across suppliers. Request both the GSM value and confirmation of the basis sheet size they’re using if they quote in pounds.<\/p>\n\n\n\n Higher GSM generally delivers more rigidity and perceived sturdiness. A 70gsm wrap holds a tight fold better than a 40gsm sheet. It feels more substantial when a customer picks up their sandwich. It resists tearing during aggressive wrapping.<\/p>\n\n\n\n Lower GSM provides flexibility and drapes. A 28gsm tissue conforms around a croissant without adding bulk or fighting the shape. Lighter sheets work well for applications where stiffness would be a problem\u2014interleaving pastries, for example, or lining a basket where the paper should settle into corners.<\/p>\n\n\n\n A heavy 85gsm sheet can turn translucent and oily within minutes if it lacks barrier treatment. Meanwhile, a lighter 45gsm sheet with proper greaseproof coating will block oil from a basket of fries for the entire meal. Grease resistance depends on barrier chemistry\u2014specific treatments, coatings, and resistance ratings\u2014not on how much the paper weighs.<\/p>\n\n\n\n When a wrapper fails and grease soaks through, the instinct is to order heavier paper. Instead, you must specify a Kit Level<\/a> (TAPPI T 559<\/a>), which measures the paper’s resistance to oil and grease penetration.<\/p>\n\n\n\n Food-contact compliance works the same way. Paper weight doesn’t prove regulatory compliance\u2014that requires separate documentation<\/a> tied to applicable standards.. When compliance matters for your application, it’s typically demonstrated through declarations referencing regulations like 21 CFR 176.170 for food-contact materials<\/a>, not through GSM values.<\/p>\n\n\n\n Start with how the paper will be used\u2014not with the GSM number itself.<\/p>\n\n\n\n Identify the format first.<\/strong> Is it a wrap that folds tightly around food? A liner sitting flat in a basket or tray? A bag that carries weight and handles stress? A tray sheet with minimal handling? Each format has different rigidity requirements.<\/p>\n\n\n\n Consider handling stress.<\/strong> Will the paper be folded multiple times? Will it face steam or moisture from hot food? Will customers carry it for several minutes before eating? Higher handling stress generally calls for higher GSM to maintain wrapper integrity and tear strength.<\/p>\n\n\n\n Match GSM to the feel you need.<\/strong> A flimsy liner that slides around in a basket frustrates kitchen staff. An overly stiff wrap that cracks when folded wastes money and looks unprofessional. Use GSM to dial in the right “substance” for your application.<\/p>\n\n\n\n Specify grease resistance separately.<\/strong> If the menu item is oily\u2014burgers, fries, fried chicken, anything with visible grease\u2014add a barrier spec to your requirements. Don’t assume that higher GSM handles this. It won’t.<\/p>\n\n\n\n Think of this as a two-lane approach. Lane A covers GSM: you’re setting stiffness, feel, and structural integrity. Lane B covers grease resistance: you’re specifying barrier performance when oily foods are involved. Keeping these lanes separate is how you escape the compliance-cost trap\u2014paying for unnecessary weight when the real issue is a missing greaseproof requirement, or choosing “cheap” paper that fails mid-service because barrier specs were never addressed.<\/p>\n\n\n\n Paper grades form a natural progression from light and flexible to heavy and structured. Understanding this spectrum helps you place your application in the right zone before narrowing to specific numbers.<\/p>\n\n\n\n The following ranges represent industry-standard benchmarks for food-service conversion in food packaging paper<\/a>. Actual performance varies with fiber type, coatings, and your specific menu items. Always test samples with your actual food before committing to volume orders.<\/p>\n\n\n\n
\n\n\n\nGSM in Plain English: What That Number Actually Means<\/h2>\n\n\n\n
![\"\u201cGSM](\"https:\/\/www.paperindex.com\/academy\/wp-content\/uploads\/2026\/02\/gsm-measurement-and-standardization.png\")
<\/figure>\n\n\n\nGSM vs. Basis Weight: Why Quotes Can Get Confusing<\/strong><\/h3>\n\n\n\n
\n\n\n\nWhat GSM Changes\u2014and What It Doesn’t<\/h2>\n\n\n\n
\n\n\n\nA Simple Menu-to-GSM Matching Framework<\/h2>\n\n\n\n
![\"\u201cMenu-to-GSM](\"https:\/\/www.paperindex.com\/academy\/wp-content\/uploads\/2026\/02\/menu-to-gsm-matching-framework.png\")
<\/figure>\n\n\n\n
\n\n\n\nCommon GSM Ranges by Application<\/h2>\n\n\n\n