First, the process classification: molding foam: a foam (large mold, small mold), secondary foam injection foam: MD, slippers continuous foam: EPE extrusion foam: board two, EVA foam basic formula: EVA/LDPE foaming agent Bridging agent Zinc oxide color filler lubricant Special functional additives 1, main raw materials: LDPE: can make a larger rate of foam products, harder and not resilient, mainly used for foam insulation materials, slippers, bags, etc. EPDM: increase elasticity natural rubber: increase anti-slip performance 2, foaming agent existing high, medium, low temperature high temperature: Has a better ratio, but has an impact on the color of the product Medium temperature: for injection and small mold low temperature: for MD, and have color requirements of the product 3, crosslinking agent DCP: universal, low price, but taste BIPB: TAIC: assistant crosslinking agent can effectively help improve the cross-linking speed and effect 4. Zinc oxide classification: Grade A, activity, zinc carbonate grade A: high content of advantages, good physical properties of products; But the price is high and the heavy metal content may exceed the standard activity: low content, low price but low heavy metal zinc carbonate: low content, small particles, foaming fast, suitable for the production of low-grade products 5, color masterbatch: good dispersion, color positive powder: low price, poor dispersion environment polluted color sand: Better dispersion, less pollution 6, lubricant lubricant: stearic acid, EBS function: convenient processing such as turbines