RAJA Self-adhesive Paper Tape 70 gsm

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RAJA Self-adhesive Paper Tape 70 gsm - 2

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Strong 70gsm Kraft paper for durable, reliable sealing
Natural rubber adhesive sticks securely to all carton surfaces
No water required – quick and easy application
Tear by hand or use with a dispenser gun for convenience
Fully recyclable with the box, promoting sustainability
Ideal for cartons up to 30kg, providing heavy-duty performance
Sold in packs of 36, priced per roll

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Find this product on page(s) 455 of the general catalogue

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The ecological alternative for heavier parcels

This strong paper tape is a self-adhesive 70gsm Kraft paper tape used for sealing cartons, securing parcels up to 30kg, and closing boxes at warehouse despatch benches and e-commerce packing stations. The denser 70gsm Kraft backing provides greater tensile resistance than standard 57gsm paper tape, while retaining hand-tear and full recyclability with the box. RAJAPACK holds a Gold rating from EcoVadis for its responsible sourcing commitments.

70gsm Strong Kraft paper tape with natural rubber adhesive. Seals cartons up to 30kg, tears by hand, and recycles with the box. The step up from standard paper tape for heavier mixed-weight despatch.

Best for

Sealing cartons between 20kg and 30kg at hand-packing stations where the 57gsm standard tape is reaching its weight limit and reinforced tape would be over-specified for the load. The denser 70gsm backing holds seam stress that thinner paper tape cannot sustain without edge lift.
Mixed-weight despatch operations running a single tape across a range of carton weights up to 30kg. One roll covers light and heavier cartons without switching product mid-shift.
Retail, e-commerce, and fulfilment packing where hand-tear speed matters and the parcel is customer-facing. 70gsm Kraft presents a clean natural finish that polypropylene tape cannot match.
Businesses with a single-stream recycling policy. Tape and box go into the same cardboard collection without separation.
Storage and archiving at room temperature (14-28°C) where a 9 month shelf life allows bulk purchasing without adhesive degradation risk.

Not for

Cartons over 30kg. At 70gsm, natural rubber adhesive will not hold sustained load stress at heavier weights. Use reinforced Kraft paper tape or polypropylene hot melt for cartons between 30kg and 75kg.
High-volume machine-packing lines. This tape is hand-applied only — it is not compatible with automatic case-sealing machines. Use machine polypropylene tape for automated lines.
Cold environments below 10°C. Natural rubber adhesive loses initial tack below its minimum application temperature, producing seals that look bonded but have not fully set.
Outdoor or UV-exposed storage. No UV resistance — adhesive and Kraft paper backing will degrade under direct sunlight before the rated shelf life.
Humid environments above 65% RH. Kraft paper backing absorbs moisture, causing edge curl and reduced bond strength on the carton surface.

Key features

70gsm Kraft paper backing for hand-tear with greater tensile resistance. At 70gsm, the Kraft paper backing is denser than standard 57gsm tape. The higher fibre density resists longitudinal splitting under seam stress — the failure mode that standard paper tape shows first when carton weight approaches its limit. The tape still tears cleanly by hand across the grain, without needing a blade or dispenser cutter.
Natural rubber adhesive for immediate contact bond on corrugated board. Natural rubber achieves full initial tack faster than synthetic acrylic on porous corrugated board surfaces. The adhesive flows into the board surface on first contact without needing a pressure dwell period. On a fast packing bench sealing cartons up to 30kg, that immediate grip means the seal is set before the next carton is in position.
Single-width 48mm format for full carton seam coverage in one pass. At 48mm, one pass of tape covers a standard single or double-flap carton seam completely. Narrower tapes require two passes to achieve full seam coverage on wider carton flaps, doubling application time and material use at high volumes.
Recyclable with the box — no separation at disposal. 70gsm Kraft paper and natural rubber adhesive are both accepted in standard UK cardboard recycling streams. The tape does not need to be removed before the box is recycled. For businesses managing customer returns or third-party collections where box separation is not guaranteed, this removes a manual step from the process.
76mm core for compatibility with standard desktop dispensers. Fits all standard 76mm desktop tape dispensers without adapters or core inserts. If your team already uses polypropylene or 57gsm paper tape on 76mm dispensers, this tape runs on the same equipment with no changeover cost or equipment investment.

How to get the best result

Confirm the carton weight before choosing this tape

This strong paper packing tape is rated for cartons up to 30kg. For cartons consistently under 20kg, the 57gsm standard paper tape is the more economical choice. For cartons regularly above 30kg, reinforced paper tape is the correct specification. Using 70gsm where reinforced tape is needed will produce seals that hold on the bench but fail under stack load in transit.
Bring cold cartons to room temperature before sealing

Minimum application temperature is 10°C. Cartons stored overnight in unheated areas can arrive at the packing bench surface-cold even when the room reads above 10°C. Corrugated board is a thermal insulator. Natural rubber adhesive applied to cold board looks bonded but has not wet-out fully into the board fibres and will peel under load — particularly at the seam centre where pressure is hardest to apply evenly.
Apply firm pressure along the full tape length immediately after laying

Natural rubber adhesive requires firm, even pressure across the entire bonded length to reach rated bond strength on cartons up to 30kg. The most common failure on heavier cartons is applying tape and moving straight on — the leading and trailing ends bond, the middle does not. At 30kg, that unseated centre section is enough to cause seam failure at the first handling stage. Run the heel of your hand firmly along the full run within 3 seconds of laying.
Tear across the grain, not along it

70gsm Kraft tears cleanly when pulled sharply perpendicular to the roll direction. The denser 70gsm backing is more resistant to hand-tear than the 57gsm standard, so the pulling angle matters more. A clean right-angle pull downward produces a straight edge. Pulling back along the tape length on 70gsm produces a ragged split that is harder to recover than on lighter paper.
Store rolls horizontally in original packaging at 14-28°C, below 65% RH

Storing rolls upright causes adhesive to migrate unevenly under gravity, producing variable tack across the roll width. Under correct conditions, shelf life is 6 months. Rolls stored near loading bay doors or in humid areas degrade significantly faster. At 30kg carton weights, degraded adhesive that might hold a lighter load will fail — inspect older stock before use on heavier cartons.

Technical specifications

Material / backing: Kraft paper
Adhesive: Natural rubber
Paper weight: 70gsm
Width: 48mm
Length per roll: 50m
Core size: 76mm
UV resistance: No
Max application temperature: 60°C
Min application temperature: 10°C
Weight capacity: Up to 30kg
Shelf life: 6 months (correct storage conditions)
Storage conditions: 14-28°C, max 65% relative humidity
Tearability: Hand and dispenser
Colour: Brown
Brand: RAJA

Choosing the right tape for your operation

This tape fills a specific gap — heavier than standard paper tape, lighter than reinforced. Here is how it sits within the paper tape range.

70gsm strong paper tape (this product): Cartons between 20kg and 30kg, manual hand-packing, room temperature environment, recyclability required.
57gsm self-adhesive paper kraft tape: Cartons consistently under 20kg where lighter tape is sufficient and more economical. Same recyclability, lower cost per roll.
Reinforced 125gsm Kraft paper tape: Cartons above 30kg or subject to rough handling in transit. Cross weave reinforcement distributes seam stress in a way that 70gsm unreinforced paper cannot.
Hot melt 80gsm brown paper tape: Where faster initial tack is needed on a high-throughput bench. Hot melt adhesive grips slightly faster than natural rubber on first contact, useful when dwell time is a constraint.
Polypropylene tape: Where packing speed is the primary constraint, recyclability is not required, or temperatures regularly drop below 10°C.

Frequently asked questions

What is strong paper tape?

Strong paper tape is a self-adhesive 70gsm Kraft paper packaging tape with a natural rubber adhesive that bonds on contact without water activation. The denser 70gsm Kraft backing gives it greater tensile resistance than standard 57gsm paper tape, making it suitable for sealing cartons up to 30kg. It tears by hand without a blade and recycles with the cardboard box in standard UK recycling streams.

What is the difference between 57gsm and 70gsm paper tape?

The difference is in the Kraft paper backing density. 70gsm Kraft has a denser fibre structure than 57gsm, which resists longitudinal splitting under seam stress on heavier cartons. Both tapes use natural rubber adhesive, both tear by hand, and both recycle with the box. The 70gsm is rated for cartons up to 30kg versus 20kg for the 57gsm. If your cartons are consistently under 20kg, the 57gsm is the more economical choice.

Is strong paper packing tape recyclable?

Yes. 70gsm Kraft paper and natural rubber adhesive are both accepted in standard UK cardboard recycling streams. The tape does not need to be removed from the box before recycling. RAJA holds a Gold rating from EcoVadis for its responsible sourcing and packaging commitments. If you use a specialist contracted waste service, confirm with your waste contractor that natural rubber adhesive residue is accepted in their stream.

Why is my paper tape peeling on heavier cartons?

On cartons approaching the 30kg limit, edge peel almost always comes from insufficient pressure at the seam centre rather than adhesive failure. Natural rubber adhesive needs firm pressure across the full bonded length within 3 seconds of laying — not just at the ends. At heavier weights, any unseated section of the seal is enough to cause failure at the first handling or palletisation stage. Run the heel of your hand firmly along the full tape length immediately after applying. A secondary cause is applying below 10°C minimum temperature, where adhesive does not fully wet-out into the board surface.

Can 70gsm paper tape be used on a tape dispenser?

Yes. This tape runs on any standard desktop tape dispenser with a 76mm core. The denser 70gsm backing feeds and cuts consistently on standard dispensers — no adjustment needed compared to lighter 57gsm tape. It is not compatible with automatic case-sealing machines, which require machine-grade polypropylene tape.

Can strong adhesive paper tape be used in cold environments?

The minimum application temperature is 10°C. Natural rubber adhesive does not achieve full bond strength below this threshold. Seals applied to cold board surfaces look set but will peel under load — a particular risk on 30kg cartons where the seal is already working near its rated limit. Bring cartons to room temperature before sealing if your packing area regularly drops below 10°C.

How should I store 70gsm paper tape rolls?

Store rolls horizontally in original packaging at 14-28°C with relative humidity below 65%. Upright storage causes adhesive to migrate unevenly under gravity, producing variable tack. Shelf life under correct conditions is 6 months. On heavier cartons near the 30kg limit, degraded adhesive that might hold a lighter load will fail — check older stock before use if storage conditions have not been maintained.

You might also need

Desktop tape dispensers with 76mm core compatibility. At 30kg carton weights, consistent tension on application matters more than at lighter weights. A dispenser controls tension and placement more reliably than hand-pulling across a full shift.
Cardboard boxes and cartons in double-wall corrugated board for cartons approaching 30kg. Single-wall board at heavier weights can fail at the base before the tape seal becomes the weak point — the box and the tape need to be specified together.
Void fill to maintain internal load distribution. Under-filled cartons shift contents in transit and concentrate impact stress at the sealed seam. At 30kg, that internal movement creates forces that even correctly applied 70gsm tape cannot absorb.