DELO PHOTOBOND PS4140 is reportedly the world’s first liquid tape for gas diffusion layer fixation in fuel cells. The liquid pressure-sensitive adhesive (PSA) replaces conventional tape-based solutions and offers key advantages. It can be applied in a fully automated process with freely selectable dispensing geometry, requires no cutting, and therefore generates no material waste. After fast curing and joining, parts can be handled immediately.

The adhesive bonds reliably to typical fuel cell materials. It delivers high peel resistance of up to 0.9 N/mm on PET/PET. A glass transition temperature of –10 °C ensures flexible, stable bonds even at low temperatures. Both properties help compensate for peel loads that occur in roll-to-roll processes commonly used in fuel cell production. With a water absorption of only 0.7 wt.%, the liquid tape remains dimensionally stable under the persistently high humidity typical of fuel cell environments. In addition, the mechanical stability of the liquid tape has been confirmed after storage in application-relevant media at typical operating temperatures.