Properties of Black Delrin

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Properties of Black Delrin
Black delrin can be moulded or machined to exacting standards. (gear image by circotasu from

Delrin is a polymer plastic that is a good choice as a substitute for parts made of wood or metal. Delrin is easy to saw, drill, lathe and even sand. It is stiffer than most plastics and can be machined to finer specifications. Black delrin (Dupont 300CP BK642) has improved thermal stability and exceptional ease of processing for both moulding and machining.

Characteristics of Black Delrin

Black delrin is designed to maintain the characteristics of natural unpigmented delrin. Delrin 300CP BK642 has high tensile strength and high impact strength. It is designed to have excellent resistance to creep and fatigue.

Physical Properties

Black Delrin 300CP BK642 has a density of 1.42g/cm3. It has a yield stress of 10.3 kpsi and a yield strain of 22 per cent. Nominal strain at break is 40 per cent and it has a tensile modulus of 440 kpsi. The melting temperature of black delrin is 178C. Black delrin is an acetal polymer resin also known as polyoxymethylene (POM). Delrin has exceptional tolerance to impact and strain.

Processing Characteristics

For moulding, black delrin should be heated to 210 to 220 degrees C, with the optimum being 215C. Optimum mould temperature is 90 degrees C. Black delrin should be dried or cured at 80 degrees C for two to four hours. Hold pressure during forming should be between 12 and 15 kpsi. Mold shrinkage is between 1.8 and 2.1 per cent. Delrin is noted for low-void moulding applications.

Typical Applications

While black delrin can be moulded, it is commonly finished by machining. Typical uses are for precision-fit parts that are subjected to wear. Applications include wear rings, guide rings, piston and rod bearing rings, bushings, spacers and washers. Black delrin has excellent resistance to many solvents and fluids including hydraulic fluids, fuels such as gasoline, alcohol, diesel and others. Delrin is also resistant to water-based solutions. It is approved by the FDA for food-based applications. Dupont manufactures several types of black delrin designed for specific applications requiring different tolerances to temperature, lubricity and other characteristics.

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