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Glossary » Materials » Polymers » Polyacetal » Mineral Filled

Mineral Filled Acetal is a subcategory of Polyacetal. The additative is added during the manufacturing process. Its elastic modulus ranges from 522 to 780 MPa. Its flexural modulus ranges from 430 to 715 MPa. Its tensile strength ranges from 6400 to 11500 MPa at break. Its flexural strength ranges from 12500 to 13000 MPa. Its Izod Impact strength ranges from 0.9 to 1.2 J/cm. Its elongation at break ranges from 5 to 55 %. Its hardness ranges from 83 to 90 Rockwell M. Its specific gravity ranges from 1.48 to 1.64. Its coefficient of thermal expansion ranges from 80 to 90 x 10^-6/°C. Its melting temperature ranges from 160 to 175 °C. Its molding pressure ranges from 10 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.