BOPP tape micron guide, which thickness for which carton weight
Most tape enquiries we get start with one word: micron.
"Send me 40 micron." "Is 45 better?" "Do you have 70?" We make BOPP tapes up to 70 micron, so I can sell any of these. But the right answer depends on the contents, the carton material and the application method, by hand or by machine.
Here is the guide I would give a friend who is buying tape for the first time. We run our own tape plant in Jaipur, so this guide comes from the factory floor.
The short answer
For light ecommerce parcels in single-wall cartons, 36 to 40 micron is usually enough. For general cartons of 5 to 15 kg, 40 to 45 micron is the safe middle. For heavy, export or long-storage cartons, go to 45 to 55 micron. Keep 60 to 70 micron for very heavy loads, rough recycled board and hard conditions.
Micron is only half the story.
A well-made 45 micron tape will beat a badly made 55 micron tape every day.
What "micron" means on a tape
BOPP stands for biaxially oriented polypropylene, a film stretched in two directions to make it strong and clear. One micron is one thousandth of a millimetre. On a BOPP tape, the micron figure is normally the total thickness: the BOPP film plus the adhesive layer on it.
That creates a trap.
Two tapes can both say 45 micron. One has thick film and a thin coat of glue. The other has thinner film and a proper coat of glue. The second one will usually hold your carton better.
Here is the rule of the trade I share with new buyers. The film carries the load, and the adhesive does the holding. You need enough of both. A customer only notices the one that fails.
When you compare quotes, ask two questions.
- Is the micron figure the total thickness, or the film only?
- How much of it is adhesive?
For buyers in the US, thickness is often given in mil. One mil is 25.4 micron, so a 2 mil tape is about 51 micron.
For a reference point, I looked up 3M's datasheet for Scotch 371, a general-purpose box sealing tape. It lists a total thickness of 45 micron, measured by the European method AFERA 5006. So "general purpose" from one of the biggest tape brands sits right in the middle of the range.
A thickness guide by carton weight
This table is a guide from our own experience, not a standard. No official standard maps tape micron to carton weight. Use it as a starting point, then test on your own cartons.
| Carton and contents | Box material | Suggested total thickness | Width |
|---|---|---|---|
| Light parcels up to about 5 kg, ecommerce | Single wall (3-ply) | 36 to 40 micron | 48 mm |
| 5 to 15 kg, general goods | 3-ply or 5-ply | 40 to 45 micron | 48 mm |
| 15 to 25 kg, export or long storage | 5-ply, double wall | 45 to 55 micron | 48 or 72 mm |
| Over 25 kg, rough recycled board, cold or humid storage | 5-ply or 7-ply | 55 to 70 micron | 72 mm, H-seal |
Two notes on the table. Heavy cartons need more than additional thickness. They need a wider tape and a better sealing pattern. A single strip across the top (an I-seal) is fine for light parcels. For heavy and export cartons, also tape the two edge seams (an H-seal), and bring the tape at least 5 cm down each side.
And the box itself matters as much as the weight. My advice is to look at the carton first whenever a tape "fails". Smooth virgin kraft takes tape well. Recycled board with a dusty, soft top layer often fails at the paper, not at the tape. When the tape lifts with a layer of paper stuck to it, the tape has done its job. The box has not.
Climate: Indian summer, monsoon and winter
India tests tape harder than most markets. We sell the same tape into three very different seasons, often to the same customer in the same year.
- Summer. Godowns under tin roofs get very hot in May and June. Some adhesives soften in heat, and the tape can creep and lift at the ends. Give heavy cartons a slightly thicker tape and an H-seal in summer, especially if the goods will sit in storage for months.
- Monsoon. Corrugated cartons absorb humidity from the air. Their top layer gets weak, and the tape pulls off with the paper. Store cartons on pallets, away from damp walls. No tape can fix a wet carton.
- Winter in north India. Cold cartons and cold tape grab slowly. Keep tape stock at room temperature and press the tape firmly after application. I would rather a packer spend one extra second rubbing the tape than lose a carton in transit.
The adhesive formulation changes this behaviour, and this is where manufacturers differ. Water-based acrylic adhesive ages well and handles heat and sunlight well, but it grabs more slowly in the cold. Hot melt (rubber-based) adhesive grabs fast, even on dusty recycled board, but it can soften in high heat. We make BOPP tape with both acrylic and hot melt adhesive. Tell us where the cartons will be stored and we will suggest the right one.
Hand taping or machine taping
For hand dispensers, the common size is 48 mm x 65 m on a 3 inch core. It is comfortable for packers, and changing rolls takes seconds.
For carton sealing machines, the roll needs to be much longer, so the line does not stop every few minutes for a roll change. We have made rolls of 650 m for machine users. A machine pulls the tape at a fixed tension, so the tape must unwind evenly and must not stretch or neck down under that pull. A tape that works on a hand dispenser does not always work on a machine.
Run a full roll on your machine before placing a big order.
Large converters who slit their own rolls buy BOPP tape jumbo rolls and cut them to size.
On width, 48 mm is standard. Go to 72 mm for large or heavy cartons. Narrow widths like 24 mm and 36 mm suit small boxes and bundling.
One honest tip on length. Some rolls in the market are sold as "65 m" and have less. Weigh ten rolls of the same size. If one supplier's roll is much lighter than another's at the same stated micron and length, something is missing.
Printed tape
Printed tape does two jobs, and I think buyers underestimate the second one. It carries your brand to every customer who opens the box. It also shows tampering, because a carton cut open and re-sealed with plain tape is easy to spot.
We print BOPP tape in up to 8 colours by rotogravure. For printed tape, share your artwork, colours and the carton size early, so we can plan the print repeat to look right on the box. Choose the same micron you would choose for plain tape on that carton.
A simple test you can run yourself
Labs test tape with methods from the Pressure Sensitive Tape Council (PSTC): PSTC-101 for peel, PSTC-107 for shear and PSTC-6 or PSTC-16 for tack. You do not need a lab to compare two suppliers. Use your own cartons, because that is where the tape has to work.
- Tack. Press your thumb lightly on the sticky side and lift it. Good tape grabs immediately. Then put a strip on a carton with light hand pressure only, and see if it stays down.
- Peel. Seal a strip on your carton, rub it firmly, wait 20 minutes and pull it back slowly. Good tape tears the top paper of the carton instead of peeling clean.
- Shear. Stick 2.5 cm of tape on the side of a carton and hang a 1 kg packet of salt from the free end. Leave it overnight in your warehouse and measure how far it has moved.
- The real test. Seal ten filled cartons, stack them in the hottest corner of the godown for a week and check whether any tape ends have lifted.
Run the same tests on your current tape and on the sample.
The comparison matters more than any number on a datasheet.
Where JPPL fits
We make BOPP tapes up to 70 micron, plain and printed in up to 8 colours, in hand and machine roll sizes. I will be honest, most of our buyers do not need 70 micron. It costs more, and for a normal 10 kg carton a good 45 micron tape does the job.
If you want to move away from plastic tape, our kraft paper tapes are a paper option for cartons where the look matters.
Questions buyers ask
Is 40 micron tape enough for ecommerce parcels?
Usually yes, for single-wall boxes up to about 5 kg. If your parcels are heavier or stored in a hot godown, move to 45 micron.
Is a higher micron always stronger?
No. Additional thickness helps, but the adhesive coat and the carton surface decide whether the box stays closed. A 45 micron tape with a good adhesive coat can beat a 55 micron tape with a thin one.
Should I ask for total thickness or film thickness?
Ask for both. The total tells you the overall build. The film figure tells you how much of that total is adhesive.
Send us your carton size, the weight inside and how you seal (hand or machine) through our contact page. We will suggest a micron and width, and send two free sample rolls for you to test against your current tape.
