产品展厅
产品展厅
7350M is an ethylene/vinylene acetate copolymer. The trade name is Taisox. This product is manufactured by the high-pressure process. By incorporating vinyl acetate (VA) into the ethylene chain, the high-pressure process produces co-polymerization to EVA. 7350M is a general-purpose for X-linked foam shoes, mid-sole, gaskets. It provides good chemical resistance, excellent elasticity, and high flexible properties.
Physical Nominal Value Unit Test Method Density 0.938 g/cm3 ASTM D1505 Melt Mass-Flow Rate (MFR) (190°C/2.16 kg) 2.5 g/10 min ASTM D1238 Vinyl Acetate Content 18.0 wt%
Mechanical Nominal Value Unit Test Method Tensile Strength ASTM D638 Yield 640 psi Break 2130 psi Tensile Elongation (Break) 800 % ASTM D638
Hardness Nominal Value Unit Test Method Durometer Hardness ASTM D2240 Shore A 88 Shore D 38
Thermal Nominal Value Unit Test Method Brittleness Temperature < -94.0 °F ASTM D746 Vicat Softening Temperature 140 °F ASTM D1525 Melting Temperature 183 °F DSC
VA 含量 和 MI（熔融指数） 是 EVA 两个最关键参数，直接决定：软硬度、弹性、发泡难易、强度、加工好不好做。 一、VA 含量（醋酸乙烯含量）—— 决定「软不软、弹不弹」
VA 越高 = 越像橡胶；VA 越低 = 越像塑料。
VA 低（14%～18%）
VA 高（26%～40%）
简单记： VA ↑ = 更软更弹更粘；VA ↓ = 更硬更挺更强。 二、MI（熔融指数）—— 决定「好不好加工、流不流动」
MI 越高 = 熔体越稀 = 越好流动； MI 越低 = 熔体越稠 = 强度更好，但难流动。
MI 低（2～3）
MI 高（5～6 以上）
