Water-activated tape, also known as gummed paper tape, is a kraft paper tape coated with a starch-based adhesive that only turns sticky when it is moistened. Once applied to a cardboard box, the adhesive soaks into the fibres of the carton and dries to form a single, tamper-evident bond that becomes part of the box itself. That fibre-to-fibre seal is stronger, more secure and more recyclable than ordinary plastic packing tape, which is why a growing number of UK businesses are switching to it.
If you ship parcels and want a cleaner, more professional and more secure seal, this guide explains exactly how gummed paper tape works, how it compares with plastic tape, and when it is the right choice for your packaging.
What is water-activated (gummed) tape?
Water-activated tape (often shortened to WAT) is made from a backing of kraft paper coated with a dry, starch-based adhesive. The adhesive is derived from natural, renewable starches such as corn, potato or tapioca, and it stays completely dry and non-tacky on the roll. It is only when water is applied that the adhesive activates and becomes ready to bond.
You will find it in two main forms. Standard gummed tape is a single layer of paper, which is ideal for lighter cartons and everyday parcels. Reinforced gummed tape has fibreglass threads laminated between two layers of paper, giving it extra strength for heavier boxes. Both are available as plain kraft or as custom printed tape from Fast Printed Tapes, so you can seal a parcel and reinforce your brand at the same time.
How does water-activated tape work?
The science is what makes gummed tape so effective. When you moisten the adhesive side, hydrated starch chains flow into the porous cellulose network of the corrugated board. As the moisture evaporates, hydrogen bonds knit the starch to the cardboard fibres, creating an integrated bond at fibre level rather than a layer of glue simply resting on the surface.
In practice this means the tape effectively becomes part of the box. A single strip across the seam is usually enough to close a carton securely, whereas pressure-sensitive plastic tape often needs several passes to hold. To apply it consistently you moisten the tape as you dispense it, which is why most businesses pair their rolls with a gummed paper tape dispenser. A simple manual gummed tape dispenser wets and cuts each strip to length, keeping the process quick and mess-free on a packing bench.
Water-activated tape vs plastic packing tape
The most common question we hear is how gummed paper tape compares with the plastic (pressure-sensitive) tape most people already know. The short answer: plastic tape sits on top of the box, while gummed tape bonds into it. That single difference drives most of the advantages below.
- Security: Because gummed tape fuses with the cardboard, it cannot be peeled back cleanly. Any attempt to open the box tears the paper or the carton itself, giving you a genuinely tamper-evident seal. Plastic tape simply floats on the surface and can often be lifted and re-stuck without a trace.
- Strength: One strip of water-activated tape typically seals a carton that would take two or three strips of plastic tape, so boxes are less likely to burst open in transit.
- Reliability in tough conditions: Gummed tape bonds well to recycled and dusty cardboard, where plastic tape adhesive frequently fails to grip.
- Recyclability: Paper backing and starch adhesive mean the sealed box can usually be recycled as one, with no need to peel plastic off first.
- Presentation: A clean kraft finish looks more premium than shiny plastic, and printed gummed tape turns every parcel into branded packaging.
Is water-activated tape recyclable and eco-friendly?
Yes. Because gummed tape is made from kraft paper and a plant-derived starch adhesive, it is widely recyclable along with the corrugated box it seals. There is no plastic layer to separate, so a taped-up cardboard box can generally go straight into card and paper recycling. Corrugated cardboard is one of the most commonly recycled materials in UK household collections, and you can check local guidance through Recycle Now.
For businesses trying to reduce plastic in their packaging, switching from plastic tape to gummed paper tape is one of the simplest changes to make. It also supports wider efforts to cut avoidable plastic waste, an area covered by the government's guidance on packaging waste and design. Kraft paper comes from wood pulp, a renewable resource, and the starch adhesive replaces the petroleum-based glues used on many plastic tapes.
When should you use gummed paper tape?
Water-activated tape is not just for warehouses. It suits any business that wants a secure, professional and sustainable seal, but it comes into its own in a few situations.
High-value or fragile e-commerce orders
If you sell items that need to arrive intact and untampered with, the tamper-evident bond of gummed tape offers real peace of mind for both you and your customer. Explore the full range in our water-activated gummed tape collection.
Brands that care about unboxing
Custom printed gummed tape lets you put your logo, colours or a short message across every box. It is a low-cost way to lift the unboxing experience and make repeat customers remember you.
High-volume packing benches
When you are sealing dozens or hundreds of boxes a day, the speed of a single-strip seal and a dedicated dispenser adds up. Fewer strips per box also means lower tape usage over time.
Getting the best results from gummed tape
To get a reliable bond every time, use just enough water to moisten the adhesive without soaking the paper, and press the tape firmly across the seam so it makes full contact with the board. A dispenser takes the guesswork out of this by applying a consistent amount of water and cutting each strip to a set length. For lighter parcels a single strip along the top seam is usually plenty; for heavier boxes, use reinforced tape and consider an H-taping pattern across both the top and bottom seams.
Frequently asked questions
Is water-activated tape stronger than plastic tape?
In most cases, yes. Because the starch adhesive bonds into the cardboard fibres rather than sitting on the surface, a single strip of gummed tape usually holds a carton more securely than several strips of plastic tape. Reinforced gummed tape adds fibreglass threads for even greater strength on heavy boxes.
Do you need a special dispenser for gummed tape?
A dispenser is strongly recommended rather than essential. You can moisten the tape by hand with a damp sponge, but a manual or electric gummed tape dispenser wets and cuts each strip consistently, which is faster, cleaner and far more practical for regular packing.
Is water-activated tape recyclable?
Yes. Gummed paper tape is made from kraft paper and a starch-based adhesive, so a sealed cardboard box can usually be recycled as a single item without removing the tape first. Always follow your local recycling guidance.
Can water-activated tape be printed with a logo?
It can. Custom printed gummed tape is one of the most cost-effective forms of branded packaging, letting you display your logo or message across every parcel while still giving you a secure, tamper-evident seal.
Will gummed tape stick to any box?
It bonds best to corrugated cardboard, including recycled and slightly dusty surfaces where plastic tape often struggles. It is not designed for sealing plastic bags, poly mailers or very smooth, non-porous surfaces, as it needs paper fibres to bond into.
Ready to upgrade your parcel seal?
Switching to water-activated tape gives you a stronger, more secure and more sustainable seal, with the option to brand every box you send. Browse our gummed paper tape range and tape dispensers, or visit Fast Printed Tapes to design custom printed tape that seals and sells at the same time.