杜邦POM 500AL

杜邦POM 500AL---Lubricated Medium Viscosity Acetal Homopolymer with Low Wear and Low Friction

POM can be divided into homoformaldehyde and copolyformaldehyde according to the different chemical structures in the molecular chain. Homoformaldehyde is generally obtained by polymerization of anhydrous paraformaldehyde, and copolyformaldehyde is the copolymeric product of POM and a small amount of dioxolane. It is due to the different structure that leads to the difference of homopolymer and copolyformaldehyde in various properties. The main differences between the two are: homoformaldehyde has higher density and crystallinity, melting point and HDT are 10 ℃ higher than that of copolyformaldehyde, and the strength, creep resistance and friction resistance are better, but the thermal stability is poor, the processing temperature range is about 10 ℃, and the acid-base stability is low.

物理性能额定值单位制测试方法
密度1.39g/cm³ISO 1183
熔流率（熔体流动速率） (190°C/2.16 kg)14g/10 minISO 1133
溶化体积流率（MVR） (190°C/2.16 kg)12.0cm³/10minISO 1133
收缩率ISO 294-4
    垂直流动方向1.7%ISO 294-4
    流动方向1.8%ISO 294-4
机械性能额定值单位制测试方法
拉伸模量3000MPaISO 527-2
拉伸应力 (屈服)65.0MPaISO 527-2
拉伸应变 (屈服)11%ISO 527-2
标称拉伸断裂应变23%ISO 527-2
拉伸蠕变模量ISO 899-1
    1 hr2400MPaISO 899-1
    1000 hr1600MPaISO 899-1
弯曲模量2800MPaISO 178
冲击性能额定值单位制测试方法
简支梁缺口冲击强度ISO 179/1eA
    -30°C6.0kJ/m²ISO 179/1eA
    23°C7.0kJ/m²ISO 179/1eA
简支梁无缺口冲击强度ISO 179/1eU
    -30°C130kJ/m²ISO 179/1eU
    23°C160kJ/m²ISO 179/1eU
悬壁梁缺口冲击强度ISO 180/1A
    -40°C5.0kJ/m²ISO 180/1A
    23°C6.0kJ/m²ISO 180/1A