and ensures a superior bond – with a lower total application amount compared to the one-sided application. The result: Permanent bonds for quality mattresses [...] mattresses have to be stored for several hours after pressing until the necessary bond strength has built up. To reduce the risk of mould formation, they also have [...] adhesive, reactive hot melts provide excellent adhesion to even difficult to bond materials such as latex or gel foams, which may also have different properties
https://www.jowat.com/fr-CH/detail-de-la-salle-de-presse/polyurethane-hot-melt-adhesives-for-mattress-manufacture-highest-quality-maximum-efficiency/