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The aluminium extrusion process makes the most of aluminum’s unique combination of physical characteristics. Its malleability allows it to be easily machined and cast, and yet aluminum is one third the density and stiffness of steel so the resulting products offer strength and stability, particularly when alloyed with other metals. The aluminium extrusion process is greatly heat dependent. Monitoring temperatures from beginning to end is critical to ensuring aluminium alloy properties such as tensile and yield strengths are met, as well as affecting the final finish of the part. The aluminium extrusion process begins by heating the billets or logs to 400-480°C (750-900°F). The aluminium alloy is still solid but malleable. It does not glow when heated; aluminum looks the same whether hot or cold.