What can it actually stick together?

In laboratory tests, the adhesive achieved high strength across a range of materials:

• birch wood
• stainless steel
• aluminum
• glass
• Teflon

The Teflon result stands out. Teflon — the brand name for polytetrafluoroethylene, or PTFE — is famously difficult to bond because almost nothing sticks to its nonstick surface. Yet the mistletoe-based formulation produced load-bearing joints on it. In some tests, the glue reached shear strengths of more than 10 megapascals. A megapascal is a unit of pressure; for comparison, typical household adhesives manage far less, while specialized structural adhesives sit in this same range.

The glue also keeps working at extreme cold. It maintained its bonding performance at -150°C (-238°F).

Why does heat-reactivation matter?

The adhesive can be separated and then re-activated by heating to around 90°C (194°F) — and it can do this several times. This reversibility is unusual and could solve a specific industrial headache: glued electronics.

Many modern devices — smartphones, laptops, displays — are held together with adhesives that were never designed to come apart. Repairs are difficult, and recycling is worse, because components often break when pried apart or cannot be cleanly separated by material type.

A heat-reactivated glue changes that equation. Displays, housings or other glued components could be replaced more easily without damaging the parts, and recycling could become simpler.

The cryogenic performance opens another door. In extremely cold environments, including space technology, adhesives are typically used only when bonded joints are also secured by mechanical fasteners. That precaution exists because existing adhesives sometimes create incomplete bonds prone to failure. A glue that reliably holds at -150°C could reduce the need for bolts and brackets.

Is it ready for industry?

Not yet, and the researchers are candid about the limitation. The starting material still comes from processing mistletoe berries, which makes the approach unsuitable for large-scale production for now. A parasite that grows on host trees is not an industrial feedstock.

The next step, according to Lieleg, is to work around the plant itself. "The mistletoe berry makes use of molecular building blocks and mechanisms which, in combination with the additives selected by us, are responsible for very strong adhesion," he said. "In the long term, we want to transfer these principles to industrial manufacturing processes by exploring ways to produce the key adhesive components independently of the plant and make the process scalable."

How solid are the findings?

A few caveats are worth keeping in mind. The results come from laboratory tests, not from long-term field use in real devices or spacecraft. The study does not yet demonstrate production of the adhesive's key components without the plant, and the path from a lab-scale bio-glue to a certified industrial adhesive — especially for space applications — typically takes years of additional testing.

Still, the core result is a proof of principle with unusual breadth: one natural sugar mixture, two simple acids, and joints strong enough to count as structural — on materials ranging from wood to the most famously unsticky surface known to engineering.