However as the amount of borax, the thickening agent is increased, the adhesive becomes thicker with higher molecular weight; this effect dominate resulting in an increase in density of the adhesive produced with 0.4g of borax as shown in Figure 9.
Sodium hydroxide has been reported to have a neutralizing effect on adhesives.
Therefore the use of a base modifier will make the adhesive produced more basic, hence the pH of the adhesive will increase. These trends are shown in Figure 10.