PDF《Overview》

5 3. Key properties of Delrin? acetal homopolymer Delrin? is a highly adaptable thermoplastic material that bridges the gap between plastics and metals for a wide range of technical applications, and offers unique properties. The table below illustrates how the properties of Delrin? can translate to the functional performance of parts. Properties and features of Delrin? Applicability to parts Very hard and stiff, combining high mechanical strength with rigidity. The stiffest, strongest and most fatigue-resistant un- reinforced (unfilled) engineering polymer available. Suitable for wide range of high performance components with long use lifetimes. Low creep and low moisture absorption. Excellent dimensional stability and long operational lifecycles. High fatigue life under cyclical loadings. Suitable for long life, wear-resistant parts. High Impact resistance even at low temperatures. Can withstand repeated shock-loads. High yield strain. Good spring-back capabilities, ideal for '

snap-fit'

connections. Low coefficient of friction with inherent lubricity for non-stick properties. Suitable for maintenance-free moving and sliding parts. Retains toughness over wide temperature span from -40°C to +90°C (intermittent to 120°C). Doesn'

t get brittle at low temperatures;

suitable for winter sports equipment. High electrical resistivity with low static properties. Suitable for electrical applications and in fuel-related and similar applications. Corrosion-resistant with high tolerance to moisture, petrol, solvents and organic chemicals at ambient temperatures. Ideal for many automotive and industrial process components. Outstanding acoustic properties. Provides low-noise components for doors, etc. Favorable molding characteristics. Exhibits better flow rates than standard copolymer acetals for consistent precision molding performance. Smooth, glossy, aesthetic surface finish. Ideal for visible applications and premium consumer products. Easily worked/processed with conventional machinery and skills. Minimal investment and '

learning curve'

required. Very low weight alternative to metals. Half the weight of aluminum and six times lighter than steel. Recyclable. As a thermoplastic material, Delrin? can be recycled using industry standard recovery techniques. Specific application requirements. DuPont offers an unparalleled range of modified resins for special applications and extended performance: ultra-low friction, antistatic, UV stabilized, fiber reinforced, food contact and very-low VOC emission grades. White paper - DuPont? Delrin ? acetal homopolymer C Page

6 4. Mechanical properties comparison in detail Delrin? can be used to replace metal to achieve corrosion resistance, lighter weight, and single-stage manufacturing while by-passing multiple machining steps. Delrin? can also be used to replace polyamides (i.e. nylons) when higher stiffness and thinner parts with better creep and fatigue resistance are needed. More significantly, Delrin? is not as sensitive to moisture as polyamides, resulting in more consistent mechanical properties and part dimensions. Compared to polypropylene and polyesters (i.e. polybutylene terephthalate), Delrin? also exhibits many advantages including higher stiffness for thinner parts and better performance in wear and friction environments. Measured against amorphous engineering plastics (i.e. ABS and polycarbonate), Delrin? outperforms in chemical resistance and stiffness, and shows better performance in wear and friction environments. Acetal polymers come in various molecular weight families, depending on the manufacturer. Delrin? homopolymer is avail........