Innovation of rubber cap for covering concrete block from natural rubber

Abstract

Rubber cap for covering concrete block is a combination of concrete and rubber blocks called "Safety Block”. For this product, a concrete block serves as a base and a rubber block provides a soft and elastic surface on the top can be used in both indoor and outdoor environments. This research is to find the best formula for making rubber cap for covering concrete block and its property must meet all criteria of the industrial standard number TIS2348-2551. The best compound formulation found in the research is; rubber 100 phr, Calcium carbonate 50 phr, White clay 50 phr, Paraffinic oil 5 phr, Zinc oxide 5 phr, Steric acid 3 phr, Antioxidant 5 phr, CBS 1 phr, TMTD 0.5 phr, Sulfur 3 phr, color 5 phr, Paraffin wax 2 phr, and added UV protection 5 phr, anti-fungal 0.5 phr and anti-bacterial 0.5 phr for more efficient use of the outdoor environment. The test results from the best formula found that the product meets all criteria of the industrial standard number TIS 2378-2551 that is, hardness (56 Shore A), tensile strength (14.7 MPa), elongation at break (570%), hardness changed after aging increase 2 Shore A, tensile strength changed after aging decrease 13% and elongation at break changed after aging decrease 9%, abrasion resistance (246 mm), good Ozone resistance, compressive strength (0.96 MPa), and level 3-4 grey scale Q.U.V. weathering resistance.