Herma unveils new adhesive for tamper evident labels

With the 62L luminophore adhesive has been designed to improve safety, both for the product manufacturer as well as the product user. Instead of a special varnish that is applied to the labels afterwards, the new product integrates the luminophores directly into the coating of the adhesive bond.

‘The coating of the adhesive takes place with a precision and uniformity that is clearly superior to typical commissioned varnish work,’ said Ulli Nägele, Herma's head of development. ‘This allows us to achieve a better and complete distribution of the luminophores. We also no longer have to monitor whether the varnish was actually applied everywhere and whether there may have been any glitches.’ 

In the 13-stage Laetus scale, which is used to measure the intensity of luminescence and which is used as an industry standard, the 62L reaches a value of at least 7; usually required for pharmaceutical applications. 

Due to its high transparency and an extremely high whitening resistance, the 62L is ideal to achieve no-label-look, including for subsequent printing in multi-colored UV-printing. It also features high tack with very high cohesion in conjunction with good final adhesion. This high cohesion helps to avoid adhesive leaking. The new adhesive has high UV stability and good resistance against light, heat, water and ageing.