When sourcing a grease making machine, you must prioritize the kettle capacity (ranging from 500L to 10,000L) and the heating method, which typically involves thermal oil jackets or induction heating for precise temperature control. Ensure the machine features a high-shear homogenizer to guarantee the stability of the soap fibers and a vacuum system to eliminate air bubbles, which is critical for the final product's oxidation resistance. Additionally, the material of construction should be SUS304 or SUS316L stainless steel to prevent corrosion from chemical additives.