Hygroscopic glue

Disadvantages of the phenolic resins are the necessary longer press times compared to UF-resins, and the dark color of the glue line and the board surface. There is also the possibility of a higher moisture pickup of the boards when stored at higher relative humidity due to the hygroscopicity of the high alkali content of the resin. 

Chromated Nitrocellulose(Coton-poudre chrome in Fr), Davey of England patented in 1877, the treatment of NC with a soln of chromate or dichromate together with or w/o K nitrate, glue or a hydrocarbon. This material was non-hygroscopic and suitable for use as a core in mining fuses, instead of BkPdr Refs l)Cundill(l889) in MP 5, 309 314 (1892) 2)Daniel(l902), 143 180... 

Very hygroscopic solid with glue-like odour. Picrate y low, hygroscopic needles. Dei. comp, about 90 . 

Because of the hygroscopic nature of starch and fish glues and the wicking effect of wax resins, conservators have been prompted to search further for new materials to function as lining adhesives. Fortunately in the 20th C., polymer science has provided many new raw materials and processes to develop alternate techniques. 

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