The moisture absorption of jute composite samples were also measured according to ASTM D 5708. This test was carried out to determine the amount of moisture absorbed and the performance of the material in humid environment. Four square shaped samples of 3.5 cm x 3.5 cm of 5% natural rubber latex jute composite were tested. The samples were kept in an oven at temperature 100°C for one hour. Then the weights of the samples were measured. After that the samples were kept in a desiccator containing saturated solution of NaCl. The relative humidity of saturated Sodium chloride is 74.87 ± 0.12 at room temperature of 35°C. The percentage of moisture absorption of samples after 24, 48, and 120 h were calculated according to Eq. (4) as used in the water absorption test.

where W1 is original weight of the sample and W2 is final weight of the sample after 24, 48 and 120 h.

The results of moisture absorption test are shown in Table 6.3. The percentage of the moisture absorption gradually increases and then it reaches a saturation point and an average of 10.05% of moisture is absorbed approximately after 120 h.