Rubber is derived from petrochemical refining, with the raw rubber being non-transparent and more brownish. It has excellent elasticity and wear resistance. During the mixing process, carbon black is added to enhance reinforcement, improving hardness, wear resistance, tensile strength, and elasticity. Carbon black, being black, results in the final rubber product also being black. Products with specific performance requirements like tires (wear resistance), rubber hoses (hardness and pressure resistance), and conveyor belts (wear resistance and tear resistance) are best made with black rubber to meet functional needs.
LeeKuma has also developed colored low-pressure hoses, such as red, blue, and gray-white, for better identification by customers. While black is predominant in molded products, each type of rubber has representative colors based on its characteristics: NBR and EPDM are often black; Viton and FKM are brown; HNBR is mostly green; solid silicone rubber is translucent white, while liquid silicone rubber is nearly transparent and easy to color. Silicone products, known for high-temperature resistance, are usually red or brick red.
LeeKuma has also developed colored low-pressure hoses, such as red, blue, and gray-white, for better identification by customers. While black is predominant in molded products, each type of rubber has representative colors based on its characteristics: NBR and EPDM are often black; Viton and FKM are brown; HNBR is mostly green; solid silicone rubber is translucent white, while liquid silicone rubber is nearly transparent and easy to color. Silicone products, known for high-temperature resistance, are usually red or brick red.