Peel, Tack, and Shear: How to Read a Tape TDS Like an Engineer

Every carton sealing tape ships with a technical data sheet, and every TDS looks reassuringly precise: peel adhesion 42 oz/in, shear 50+ hours, tensile 124 lbs/in. The problem is that these numbers are only comparable when you know what each test actually measures — and most tape failures in the field trace back to specifying the wrong property, not a defective product.

What a TDS is — and is not

A TDS reports laboratory averages measured under controlled conditions: standard steel panels, fixed dwell times, room temperature. It is a comparison tool, not a guarantee. Two tapes can only be compared when the test method is identical — peel values from a 180° test and a 90° test are not interchangeable, and a shear result in hours says nothing about peel. Treat the TDS as the starting shortlist; the final decision always belongs to a trial on your own line.

Peel adhesion: how hard the tape resists being pulled off

Peel adhesion measures the force required to peel the tape from a surface at a defined angle, usually 90° or 180°, after a fixed dwell time (commonly 20 minutes). It is reported in oz/in or N/25 mm. High peel matters where the seal faces direct pulling forces — carton flaps under internal pressure, or tape applied over dusty, recycled corrugated where the bond starts weaker. Note the substrate: a value measured on stainless steel will read higher than the same tape on corrugated board. When comparing, check that both the angle and the substrate match.

Tack: the first second of contact

Tack is the tape’s ability to form a bond with light, brief pressure — the “quick stick” you feel when a finger touches the adhesive. It is commonly reported via loop tack or rolling ball tests. Tack is the property that decides whether a carton seals at line speed: on a case sealer running hundreds of cartons per hour, the tape gets a fraction of a second of roller pressure. Low tack on a fast line means edge lift, even if the peel number looks excellent. Rough or recycled liners demand higher tack than smooth virgin kraft.

Shear (holding power): the long game

Shear, or holding power, measures how long a bonded tape resists sliding under a constant load — typically a weighted strip hanging from a steel panel, reported in hours. This is the number that matters for pallets sitting in a warm warehouse, stacked cartons under sustained load, and filament tape bundling that must stay tight for weeks. A tape can have aggressive tack and still creep under shear; the two properties are independent.

Tensile strength and elongation: the strapping numbers

For filament and strapping tapes, tensile strength (lbs/in or N/25 mm) is the headline figure — the load at which the tape breaks. Elongation tells you how much it stretches first; low elongation (3–5%) keeps bundles tight, while higher elongation absorbs shock. Match tensile to the load with margin, and remember that published tensile is measured along the reinforcement direction on mono-directional grades.

Comparing two TDS documents: a checklist

1. Same test method for every number you compare — angle, dwell, substrate.
2. Same units — convert lbs/in to N/25 mm before ranking.
3. Note the conditions — temperature and humidity shift results.
4. Remember these are lab averages — confirm the shortlisted grade on your cartons, at your line speed, in your climate.

Which numbers matter for your application

Carton sealing on a fast line: tack first, then peel. Heavy or overfilled cartons: peel and shear. Palletizing and bundling: tensile and shear. Long storage in heat: shear above all. Clean removal from product or reusable containers: specify a residue-free grade and verify peel on the actual surface.

Specified correctly, a TDS stops being a wall of numbers and becomes a short, testable hypothesis: this tape, on this carton, under these conditions. Run the trial, keep the report, and the numbers start working for you.

JL3 publishes TDS data for every SKU across its kraft, water-activated and filament tape lines. Values shown are laboratory averages; samples are available for line trials — contact us through the inquiry form.