Weights of the NR sheets obtained with each wood vinegar are not different with formic and acetic acids. The weights of pre-drying and dry NR sheets are in the ranges of 550–580 and 510–525 g, respectively.
The physical and chemical properties of various pre-drying and dry NR sheets are summarized in Table 1. All coagulants prepare NR sheets with similar dirt and volatile contents. Many ingredients in wood vinegars did not affect dirt nor volatile contents in the NR sheets.