Honeymoon’ fast-setting

A particularly interesting system now used extensively in several southern hemisphere countries is the so-called honeymoon fast-setting, separate-application system [66,67]. In this system one of the surfaces to be mated in the joint is spread with a standard synthetic phenol-resorcinol-formaldehyde adhesive plus paraformaldehyde hardener. The second surface is spread with a 50% tannin solution at pH 12. When the two surfaces are... 

In the past decades, significant reductions in resorcinol content have been achieved from pure RF resins, to PRF resins in which phenol and resorcinol were used in equal or comparable amounts, to the modern-day commercial resins for glulam and fingerjointing in which the percentage, by mass, of resorcinol on liquid resins is on the order of 15 to 18%. A step forward has also been the development and commercialization of the honeymoon fast-set system [3], either composed of just synthetic PRF resins or of a PRF resin coupled with the use of tannin extracts, which in certain countries are used to obtain PRFs of 8 to 9% resorcinol content without loss of performance and with some other advantages (such as gluing of high moisture content timber). This was a system improvement, not an advance on the basic formulation of PRF resins. 

These liquid resins then work at a resorcinol content of only 9 to 11%, hence considerably lower than that of traditional PRF resins. These resins can also be used with good results for honeymoon fast-setting adhesives in PRF tannin systems, thus further decreasing the total content of resorcinol in the total resin system at a level as... 

Significant reductions in resorcinol content have been achieved from pure resorcinol-formaldehyde resins, to today s PRF resins in which the percentage, by mass, of resorcinol on liquid resins is between 15 and 18%. A step forward has also been the development and commercialization of the honeymoon fast-set system, which in certain countries is used to obtain PRFs of 8 to 9% resorcinol content without loss of performance. 

Pizzi A, Rossouw D duT, Knuffel W E, Singmin M 1980 Honeymoon phenolic and tannin-based fast-setting adhesive systems for exterior grade fingerjoints. Holzforsch Holzverwert 32 140-150... 

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