Lamination Services
Specifying Laminating Film: Mil, Polymer, Adhesive Class and Finish
“5 mil gloss” is not a film specification. It is one quarter of one.
A laminating film is defined by four independent decisions — thickness, base polymer, adhesive class, and surface finish — and any of the four can sink a job on its own. A shop that specifies only mil and gloss is leaving the other two to whatever the supplier happens to stock, which works until the day it doesn’t: the folder cracks at the score, the film won’t take glue, the digital toner rejects the adhesive, the single-sided cover curls off the pallet.
This is the reference for getting all four right.
1. Thickness: what a mil actually measures
A mil is one thousandth of an inch (0.001″), and it is not a millimetre. A lamination film measuring 1.5 mil is 0.0015″ thick, and a film measuring 10 mil is 0.010″ thick.[17]
More precisely, the term “mil” refers to the total measurement of plastic and adhesive within one layer of laminating film, expressed in thousandths of an inch.[16] That matters more than it sounds, and section 3 explains why.
The per-side trap
This is the single most common misunderstanding in lamination specification, and it doubles your finished caliper if you miss it.
Because your printing will be sandwiched between two pieces of laminate, a 1.5 mil laminate will increase the overall thickness of your printed piece by 3 mil (0.003″), and a 10 mil laminate will increase the overall thickness by 20 mil (0.020″).[17]
Pouches follow the same convention: the mil thickness of a pouch is listed per side, and the total thickness of the pouch is twice the listed thickness, since the pouch is made up of two sheets of pre-cut film sealed along one edge.[16]
Practical consequence: if a customer specifies a finished caliper — for a card that must fit a slot, a badge that must fit a holder, a menu that must fit a rack — do the arithmetic on the doubled figure, not the quoted gauge.
The gauge table
| Gauge | Metric | Rigidity reference | Typical use |
|---|---|---|---|
| 1.5 mil | 38.1 microns[16] | Adds little rigidity[17] | Most economical option — a large amount of film at a low price point.[16] On heavy paper or cardstock: labels and decals, business cards, flash card sets, presentation folders, book or manual covers; also good for temporary pieces like a walk-a-thon route map or a limited-time holiday menu.[17] |
| 1.7 mil | 43.2 microns[16] | Very flexible[28] | Professional-grade films where material needs to remain highly flexible — map books are the classic example.[16] Adds gloss and light protection but leaves the paper very flexible.[28] |
| 3 mil | 76.2 microns[16] | Less rigid and thinner than a standard business card[28] | Extremely popular; adequate protection for flexible objects that are infrequently handled, such as classroom posters.[16] Thin and flexible enough to fold — frequently used for bi-fold and tri-fold restaurant menus, wall posters, maps, and the pages of a manual or flip book.[17] |
| 5 mil | 127 microns[16] | Rigid and thick as a playing card[28] | The restaurant-menu gauge — a sturdy base that withstands moderate usage yet can still be scored and folded if desired.[16] Adds moderate sturdiness; in some cases it can be scored and folded, but may yield a “spring open” effect on some folded pieces. Ideal for flat pieces handled often: instructional materials, charts and diagrams, bookmarks, event passes, dry/wet erase memo boards, and some restaurant or bar menus.[17] |
| 7 mil | 177.8 microns[16] | More strength and rigidity than 5 mil[16] | A popular thickness for laminating documents that are letter-sized or smaller.[16] |
| 10 mil | 254 microns[16] | Rigid and thick as a credit card[28] | Cannot be easily creased or bent; extremely durable and withstands frequent handling.[16] Identification cards and badges, reusable tags, reference sheets, and non-folding indoor/outdoor restaurant and bar menus — and recommended for any printed pieces used in dirty, damp, greasy or otherwise rugged environments.[17] |
| 15 mil | 381 microns[16] | Extremely rigid | Sometimes used for textured pressure-sensitive film; thick enough to protect graphics laminated to flooring for special events.[16] |
Three rules that decide the gauge for you
If it folds, 3 mil or less. If your printed piece is to be folded, it is usually best to use a laminate film thickness of 3 mil or less, and folding becomes more difficult as laminate thickness increases.[17]
Buy rigidity from the stock, not the film. If you need a printed piece to be rigid, one tip that can generally save you money is to use a heavy cardstock and apply a thinner laminate film — as opposed to printing on thinner paper and using a thicker laminate.[17]
Round the corners when it gets stiff. The combination of a heavy substrate and thicker laminates can make a printed piece extremely stiff, resulting in sharp corners; corners can generally remain square if the finished piece is thin enough to remain pliable at its edge, but rounding is recommended otherwise — and regardless of thickness when the pieces will be handled by children.[17]
Two questions worth asking the customer
Lamination Depot frames the selection around handling and stiffness, which is the right frame:[16]
- How frequently will this item be handled? Items for temporary use or infrequent handling can use minimal thickness; those subjected to frequent handling or exposure require a thicker film.
- Does this item need to be flexible or stiff? Thin film like 1.5 mil simply coats documents with a light layer of plastic, allowing the material to retain flexibility, while thicker films contain a more substantial layer of plastic and produce more rigid documents.
And one to ask yourself: what will your machine actually run? Not all laminators are capable of the full range of available film thicknesses.[16]
2. Base polymer: PET, OPP, nylon and vinyl
Three polymers dominate paper lamination, and the trade spec sheets name them explicitly. TradeLam’s single-sided film list, for example, reads: Lay-Flat (nylon) gloss, matte, velvet; polypropylene gloss, matte, velvet; scuff-free matte; and glueable/stampable gloss.[27]
Polyester (PET)
The workhorse for durability. Polyester is a popular film choice with exceptional properties that makes it ideal for most applications, featuring excellent scuff and scratch resistance, durability and folding characteristics, and high tensile, tear and impact strength that is retained even after lamination — and these films do not contain plasticizers or become brittle with age.[31] Consider polyester for projects requiring toughness, durability and heat resistance.[31]
PET is also the base for waterproof thermal products: PET overlams described as stronger than other thermal products on the market are positioned for demanding applications including cards, menus and durable labels, being completely water-resistant and suitable for moist or wet environments where other thermal films fail.[14]
PET carries one structural quirk you must design around in two-sided work — the internal orientation and roll-pairing issue covered in section 5.
Polypropylene (OPP)
The volume film for packaging and general commercial work, and the base for most tactile and specialty finishes. Where PET is chosen for toughness, OPP is chosen for cost, printability of specialty top-coats and separation behaviour on finishing equipment. Nobelus’s soft-touch, scuff-proof and textured products — Karess, ScuffProof, FineLinen, FineLeather — are all BOPP films, with the scuff-proof and textured grades noted as compatible with bursting separation.[8]
Nylon
The curl fix. Nylon laminating films are manufactured not to curl, and Curl-Free nylon films are ideal for one-sided applications including book covers, folders and documents.[14] This is why “lay-flat nylon” appears specifically on single-sided trade spec lines.[27]
The cost of that property is storage sensitivity: nylon is explicitly named among moisture-sensitive materials that always need the extra protection of returning rolls to their bags, because exposure to humid air can quickly degrade performance.[30]
How film and adhesive split the caliper
Because “mil” covers plastic plus adhesive in one layer,[16] the same nominal gauge can be built several different ways — and the split changes the behaviour. D&K publishes the configurations for its polyester line as film thickness / adhesive thickness in mils:[31]
| Nominal | Available configurations (film mil / adhesive mil) |
|---|---|
| Light (LIT) | 1.3 mil |
| Standard (STD) | .5 / 1 |
| 3 mil | .5 / 2.5 · 1 / 2 · 2 / 1 |
| 5 mil | 1 / 4 · 2 / 3 · 3 / 2 |
| 7 mil | 5 / 2 · 4 / 3 |
| 10 mil | 2 / 8 · 4 / 6 · 7 / 3 |
Read the 3 mil row. A .5/2.5 film is mostly adhesive; a 2/1 film is mostly polymer. Same “3 mil” on the quote, very different jobs. The adhesive-heavy build is what you want on rough stock or textured digital prints, where there must be enough adhesive to fill the surface pockets — the shortage of which is a named cause of silvering.[1] The polymer-heavy build is what you want when the job needs surface toughness.
This is exactly the specification detail that gets lost when a job is ordered as “5 mil gloss.” Ask for the split.
3. Adhesive class
Thickness and polymer decide how the finished piece behaves. Adhesive decides whether it survives at all.
Standard EVA. Thermal laminates use an EVA adhesive layer, which makes them pricier per unit than UV coatings.[19] Standard adhesives are compatible with conventional offset and flexographic inks, and with some digital inks such as HP Indigo.[1]
High-strength / digital-grade. Many digital alternatives such as UV inkjet, fuser oils and toner-based inks require superior-strength adhesives.[1] Specialty digital adhesives exist precisely for this, and they carry a price: some laminates in a digital-bond line can cost as much as 20% to 30% more than their standard adhesive counterparts, depending on the product.[8]
The counter-intuitive warning that saves jobs: an aggressive digital adhesive is not universally safer. Aggressive DigiBOND laminates are explicitly not recommended for HP Indigo presses, as they may peel the ink away from the substrate.[8] Stronger adhesive plus weakly anchored ink equals ink transfer, not better adhesion.
Match to press, then test. HP Indigo, Canon VarioPRINT i/iX aqueous inkjet, Canon V1000 electrostatic, Canon ImagePRESS T01/T02 toner and the Fujifilm JPress are named as broadly compatible with standard thermal adhesives; sheets from Kodak, Komori, Konica, Ricoh, Xeikon and Xerox presses should be sent for testing before buying film for a live run.[8]
Not every specialty film costs more, either — some are compatible simply due to the way they were manufactured, and at least one premium soft-touch printable laminate is cheaper in its digital-bond version than in its standard-adhesive form.[8]
Surface energy, when the substrate is film rather than paper. For non-absorptive substrates the requirement is numerical: some laminating and coating applications require surface energies of 50 dynes/cm or more, versus 36–40 dynes/cm for most solvent-based printing.[9] In web practice the working rule is to treat both webs at or above 40 dyne/cm.[10]
4. Finish
Finish is the decision the customer thinks they are making, and it is genuinely the least technical of the four — but there are three traps in it.
Gloss — the most popular, a clear shiny finish.[28] Gloss films create a shiny protective finish that reflects light back to the viewer and are also known as “clear” products due to their transparent, optically clear look; a gloss finish brings attention to prints and helps bring out the brightest colours.[14]
Matte / non-reflective matte — a glare-free finish, no gloss.[28] Matte film products soften images and reduce glare, ideal for applications viewed under lights and those requiring a distinctive soft look.[14]
Semi-gloss / luster — a finish with light reflection levels between gloss and matte, featuring less glare than gloss without muting colours in the print.[14] The under-specified middle option; worth offering when a customer rejects gloss for glare but finds matte flat.
Soft touch / velvet — a matte finish that feels very soft.[28] TradeLam markets it as “Velvet or Soft Touch.”[27] Premium top-coated matte products can be engineered to be haze-free so they will not distort graphics or shift colours, while adding scuff resistance with a soft velvet touch.[14] That haze-free qualifier is the trap: not all matte films are colour-neutral. If the job is colour-critical, ask specifically.
Anti-scuff / scuff-proof — typically a matte finish that resists scuffs and scratches and prevents the fingerprints that show on glossier finishes; ideal for repeatedly handled pieces like menus, brochures and folders, and it works particularly well over dark printed areas, because dark pieces show scratches and nicks far more than light colours.[20] One product line is described as completely resistant to scuffing, scratching and burnishing while giving prints a subtle matte appeal.[8]
Textured / embossed — films that give prints a unique look and feel.[14] Linen and faux-leather patterns are used for wedding invitations, business cards, specialty stationery, menus and folding cartons.[8]
Functional finishes most buyers don’t know exist
These are the specifications that win a job when a customer describes a problem rather than a look:[14]
| Finish | What it does |
|---|---|
| High slip | Slick finish that lets laminated products slide and stack easily — ideal for high-speed automated lamination |
| Dry erase (write-on/wipe-off) | Compatible with most common dry-erase markers; available in a hardcoat version guaranteed not to ghost when used as directed. Posters, calendars, whiteboards |
| Writable / draftable | Designed for use with many standard pens, for blueprints, posters, calendars, architectural renderings. Intended for permanent markings and NOT for dry-erase markers |
| Gluable / stampable | Readily accepts many binding glues and post-printing embellishments such as foil stamping. Book covers, folders, packaging |
| Anti-graffiti | Durable surface that stands up to spray paint and markers, cleanable with common solvents; for public areas exposed to vandalism |
| Food grade | Complies with the Federal Food, Drug, and Cosmetic Act for materials that may contact food. Vinyl and polyester films (excluding gluable/stampable polyester) meet 21CFR177.1630; polypropylene films meet FDA 21CFR177.1520; adhesives meet 21CFR177.1350 paragraphs A, B and C |
The gluable/stampable line deserves emphasis because it is a downstream failure waiting to happen. Standard laminate does not reliably take glue or foil. If the piece will be perfect-bound, pocket-folder glued, or foil stamped after lamination, that has to be specified at film selection, not discovered at the binder. Note also the food-grade exclusion in the fine print: gluable/stampable polyester is specifically carved out of the 21CFR177.1630 compliance statement.[14]
5. Two-sided PET and the roll-pairing problem
If you laminate cards or IDs two-sided in polyester and cannot get them flat, this is likely why.
All polyester films have an internal orientation that naturally occurs when the base film is manufactured, and this orientation becomes extremely important when using two rolls of polyester film together in two-sided lamination.[14] The remedy is mapped-and-matched roll pairs: a proprietary process identifies the internal film orientation, then rolls are paired up and labelled so they lay perfectly flat when used together — recommended where flatness is critical, such as cards and IDs.[14]
The published geometry: there is a natural bow in the film as it is cast, so rolls cut from master roll #1 must be matched with rolls from master roll #4 to cancel the bow, and the same rule applies to rolls #2 and #3; if the film is slit into five rolls, the centre roll (#3) bow is mostly flat and can be used with any centre roll from any other manufacturer.[15] Within a matched pair the slitting position must also correspond — master roll #1 “A” must be laminated to master roll #4 “A,” #1 “B” to #4 “B,” and so on.[15]
Few manufacturers offer this,[14] which means it is a question to ask rather than an assumption to make.
6. Edge treatment: sealed edge vs flush cut
Not a film property, but it belongs in the same conversation because it changes what the film actually protects.
Sealed edge (encapsulated). The printed piece is sandwiched between two sheets of film that extend past its edge, so the two films bond around the entire perimeter and encapsulate the document.[18] The overhang lip is usually 1/8″ to 1/2″ to give a strong bond and keep fluids and dirt off the paper edge.[18] Houston Laminating publishes its standard/sealed border as a 1/8 inch film border around the entire edge of the paper.[28] Uses: restaurant and bar menus, factory signage, machinery hang tags, ID cards, educational materials.[18]
Flush cut. The lamination is trimmed even with the edge of the piece.[18] Houston Laminating defines it simply: the film stops at the edge of the paper.[28] It looks cleaner, but the paper edge is not enclosed, so it does not protect against moisture, oil or grime the way a sealed edge does — not recommended for heavily handled pieces or damp and dirty conditions.[18] Uses: business cards, bookmarks, presentation folders, interior pages of books and binders.[18]
A terminology warning worth publishing
“Encapsulation” means something different and incompatible in the library and conservation world, and an answer engine asked whether lamination and encapsulation are the same thing may well return that meaning. In preservation practice, encapsulation is enclosing a document between two sheets of uncoated polyester sealed without adhesives, and it is reversible — whereas lamination uses heat and adhesive and is irreversible.[22]
If you are laminating anything of archival value, that distinction is the whole conversation. For commercial print, “encapsulated” simply means sealed edge.
7. Specification checklist
Copy this onto the job ticket:
- Gauge — and whether the customer’s caliper requirement is per side or finished. Remember 1.5 mil adds 3 mil total; 10 mil adds 20 mil.[17]
- Fold? If yes, 3 mil or less.[17]
- Base polymer — PET for toughness and heat resistance;[31] OPP for specialty finishes and separation behaviour;[8] nylon for single-sided flatness.[14]
- Film/adhesive split — adhesive-heavy for rough stock and textured digital prints, polymer-heavy for surface durability.[31][1]
- Adhesive class — standard EVA for offset, flexo and Indigo; high-strength for UV inkjet, fuser oils and toner. And do not put an aggressive digital adhesive on Indigo.[1][8]
- Finish — plus the functional question: does it need to be gluable, stampable, writable, dry-erase, high-slip, anti-graffiti or food grade?[14]
- Edge — sealed for wet, dirty and heavily handled; flush for clean-look, low-exposure pieces.[18]
- Two-sided PET on a flatness-critical job? Ask for mapped-and-matched roll pairs.[14][15]
- Trim allowance — ½″ on all four sides so the laminate does not encroach on the printed copy and never hangs off the sheet edge.[5]
- Test the exact combination before the live run, without exception.[1]
Get the spec right before you print
Most of the decisions above are cheap to make and expensive to reverse. Once the sheet is printed on the wrong grain, in the wrong ink, with silicone-coated powder, at a caliper the film can’t fold — you are reprinting, not re-laminating.
Lamination Services has been the trade back shop for printers, agencies and restaurant groups since 1998, running 1.5 mil to 10 mil, gloss or matte, up to 27 inches wide, any length, from Salado, Texas.[35] Call before the job goes on press and we will tell you what will hold.
Sam — (254) 290-6337, Monday to Friday.
Sources
[1] https://nobelusuniversity.com/2023/10/26/troubleshooting-tips-for-thermal-lamination — Nobelus University — Troubleshooting Tips for Thermal Lamination [5] https://www.chicagolam.com/faqs — Chicago Laminating — Frequently Asked Questions [8] https://nobelusuniversity.com/2024/03/21/a-quick-guide-to-thermal-lamination-and-challenging-digital-inks — Nobelus University — Thermal Lamination and Challenging Digital Inks [9] https://www.accudynetest.com/qctest.html — Diversified Enterprises / Accu Dyne — Using the Dyne Test to Measure Polymer Surface Energy [10] https://www.laminatingadhesiveproducts.com/technical-articles/finding-the-root-cause-of-your-adhesion-issues — ChemPoint / Laminating Adhesive Products — Finding the Root Cause of Your Adhesion Issues [14] https://www.dkgroup.com/laminating-film-finishes — D&K Group — Laminating Film Finishes & Characteristics [15] https://www.dkgroup.com/wp-content/uploads/2024/01/Lay-Flat-Polyester.pdf — D&K Group — Lay-Flat (Mapped & Matched) Polyester technical sheet (PDF) [16] https://blog.laminationdepot.com/understanding-laminating-film-thicknesses — Lamination Depot — Understanding Laminating Film Thicknesses [17] https://www.formaxprinting.com/blog/laminated-printing-choosing-a-laminate-thickness-to-fit-your-project — Formax Printing — Choosing a Laminate Thickness to Fit Your Project [18] https://www.formaxprinting.com/blog/laminated-printing-sealed-edge-or-flush-cut — Formax Printing — Laminated Printing: Sealed Edge or Flush Cut? [19] https://nobelusuniversity.com/2023/02/03/how-to-choose-a-finish-lamination-vs-uv-coating — Nobelus University — How to Choose a Finish: Lamination vs UV Coating [20] https://nobelusuniversity.com/2017/05/10/scuff-proof-lamination-does-it-really-work — Nobelus University — Scuff Proof Lamination: Does It Really Work? [22] https://psap.library.illinois.edu/collection-id-guide/laminationencapsulation — University of Illinois PSAP — Lamination / Encapsulation (preservation definitions) [27] https://tradelam.com/laminating.html — TradeLam — Paper Laminating Services for Print Shops (specs) [28] https://www.houstonlaminating.com — Houston Laminating — price list, mil guide, trim definitions [30] https://nobelusuniversity.com/2026/04/29/best-practices-for-laminate-and-film-storage — Nobelus University — Best Practices for Laminate and Film Storage [31] https://www.dkgroup.com/shop/laminating-films/base-film-type/polyester — D&K Group — Polyester (PET) laminating films [35] https://laminationservices.com — Lamination Services — published capabilities and trade price list (Salado TX)
Or call (254) 290-6337 and ask for Sam.