POM均聚 美国杜邦 Delrin 520MP 润滑性 低摩擦系数 耐候抗UV
20%特氟隆润滑低磨损低摩擦中粘度缩醛均聚物 20% Teflon" lubricated Medium Viscosily AcetalHomopolymer with low Wear and Low Friction