The Mechanical Properties of Natural Rubber Filled with Latex Foam Waste from Industrial
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Abstract
Latex foam waste is a waste product from the production of mattresses and pillows. Recycled latex foam wastes mixed with the STR 5L rubber can be used as a filler resulting in a reduction product cost and increase the value of waste from the production process. The latex foam wastes were crushed into a smaller size by using granulator and grind with a two-roll mill machine through sieve number 10. Five rubber formulas were issued varied on the amount of latex sponge and classified into 5 levels: 0; 15; 30; 45 and 60 (phr). Then, such wastes were mixed with the chemical content in a fixed ratio including stearic acid (5 phr), zinc oxide (1.5 phr), Wing Stay L (1 phr), CBS 1 phr and sulfur (2 phr), after that grinded and mixed with a two-roll mill. Then, the test was formed by bringing the mixture to a compression molding machine at 150 degrees Celsius. The size of 25x25x0.2 cm. was tested with ASTM D412 (Die C) standard. The results found that the hardness and tensile strength was low based on the amount of waste latex sponge with a minimum of 3.59 MPa. The thickness of ASTM D2240 (Shore A) standard with the hardness properties had a higher amount of latex foam wastes with a maximum value of 55 Shore A when compared with a natural rubber without the latex foam waste from the industry.
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