Machine Design

How-to, in-depth technical articles for machine design engineers

Autonomous Vehicle Engineering

The No. 1 media source for those developing the next generation mobility solutions.

World Pumps

Major news, innovation and real-life applications for pumps and ancillary equipment.


International news and technology for marine/offshore operations around the world.

more free magazines
Glossary » Materials » Polymers » Polyacetal » 2 - 20% PTFE Filled
2 - 20% PTFE Filled Acetal is a subcategory of Polyacetal. The additative is added by weight during the manufacturing process. Its elastic modulus ranges from 250 to 280 MPa. Its flexural modulus ranges from 310 to 360 MPa. Its compressive strength ranges from 11000 to 12600 MPa. Its Izod Impact strength ranges from 0.5 to 1 J/cm. Its coefficient of thermal expansion ranges from 52 to 68 x 10-6/°C. Its melting temperature ranges from 160 to 175 °C. Its molding pressure ranges from 8 to 20 MPa.
Polyacetal, also known as Acetal, is a thermoplastic. Common trade names are Delrin and Ultraform. copolymer It is a lubricious, strong, and resistant to creep and fatigue. It has good dimensional stability and relatively high abrasion and chemical resistance. Acetal is commonly used in quality toy parts, handles, knobs, and bearing parts. Delrin is approved by FDA for use in the food industry. Acetal resins were commonly used in the plumbing industry. However, they are sensitive to chlorine which leads to cracks in acetal plumbing fittings. The widespread failure of acetal moldings in potable and hot water supplies resulted in one of the largest class actions in the USA when acetal plumbing fittings cracked and caused floods of many homes in many states.
Additional Information
Other common Polyacetal (Acetal) include Acetal, Acetal, Impact Modified Acetal, Impact Modified Acetal, Mineral Filled Acetal, Extrusion and Blow Molding Grade Acetal, 2% Silicone Low Wear Acetal, UV Stabilized Acetal, 20% Glass Reinforced Acetal, 25% Glass Coupled Acetal, 40% Long Glass Fiber Reinforced Acetal, 21% PTFE Filled Acetal, 1.5% PTFE Filled Acetal, Chemically Lubricated Acetal, UV Stabilized Acetal, UV Stabilized, 20% Glass Filled Acetal, Extrusion Grade Acetal, 30% Carbon Fiber EMI Shielding (conductive) Acetal, and 10% PAN Carbon Fiber, 10% PTFE Filled EMI Shielding (conductive) Acetal.
Related Pages