### STATISTICAL REVIEW OF CALCIUM NITRATE COAGULANT ON THE NATURAL RUBBER LATEX FILM STRENGTH

#### Abstract

Statistical analysis had been used to study the effect of calcium nitrate Ca(NO_{3})_{2} (CaN) as coagulant onto the properties of natural rubber latex involving film thickness (h), swelling ratio (Q), tensile strength (TS), elongation at break (EB) and modulus 300% (M_{300}). CaN concentration (in ethanol 95%) varied from , 5, 10, 15, 20, 25 and 30% (w/v). Calcium carbonate (30% w) were added into each variation as detacking agent. Single-coagulant dipping was applied to produce NRL film and vulcanization was held by steam 90 °C for 30 min. Swelling test had been conducted by immersion in toluene within 24 h at 25±2 °C in a closed bottle. Statistical analysis used in this work consisted of Pearson correlation and linear regression. The results showed CaN concentration gave very low correlation with TS and M300 with non-significant correlation coefficient. EB gave low correlation but with significant coefficient. High correlation was given by EB, Q and h. Linear regresion could be used to predict the behavior of EB, Q and h because their slope were not zero. Experimental data followed normal distribution because the Skewness/Kurtosis (S/K) ratio lied within value of -2< S/K<2.

Keywords: coagulant dipping, calcium nitrate, latex film, statistical analysis

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