Acetal Copolymer vs Delrin® Acetal Homopolymer

It’s more than acetal – it’s DuPont™ Delrin®.

Unlike acetal copolymers, Delrin®  is a tough, lightweight and durable acetal polymer with inherent low friction, low wear, low noise, low moisture pick-up and excellent spring back properties, invented by DuPont. It's so well known that the brand name Delrin® is often misused as the industry term for acetal resin. But, not all acetals are equal.

How is Delrin® different? 

Delrin® is an acetal homopolymer and has a uniform backbone with a larger crystalline block structure than acetal copolymers providing better chemical bonding. As a result, Delrin® is the stiffest and strongest unreinforced technical engineering polymer available. 

The uniform, larger crystalline block structure of Delrin® provides better internal bonding
Delrin® offers the potential for reduced material usage and shorter molding cycle times

   

Delrin® offers major benefits over acetal copolymer

Specifying Delrin® for highperformance, high precision mechanical parts can allow to optimize part design and production :    

  • Increased design flexibility
  • Thinner wall sections at same physical part performance
  • Lighter parts 
  • Less material usage
  • Improved mold filling
  • Shorter molding cycle times
  • Upgrading from existing tooling delivers higher performance parts
  • For new part design and upgrading with current molds 
  • Potential for reduction in part production cost (customers quote up to 20%)

Mechanical properties comparison

For example, Delrin® 500P, our general purpose resin, significantly outperforms general purpose acetal copolymer across the entire mechanical spectrum: 

  • 80% higher yield strain
  • 65% higher flow rate
  • over 40% higher impact resistance, particularly at low temperature
  • higher stiffness, yield strength, strain at break and creep resistance
  • >1000% higher flex fatigue resistance

 

ADVANTAGES OF DELRIN® VERSUS ACETAL COPOLYMER
Delrin® Properties Customer Benefits
Higher Yield Stress and Yield Strain
  • Better memory of original shape after deflection
  • Useful for snap-fits/buckles and simplicity in assembly
Higher Modulus
  • Stiffer material allows design of thinner-walled parts leading to more efficient use of resin
Higher Flow Rates with Better Mechanical properties
  • Better filling of thinner-walled cavities
  • Useful for effectively designing thin-walled parts
Much Higher Notched Charpy Impact Strength, even at Low Termperatures
  • Parts that are more resistant to fracture and capable of absorbing much more energy
  • Useful for gears in motors that change directions or stop abruptly and mechanical/moving components in refrigerated environments
Higher Strain at Break
  • Contributes to overall toughness of part
  • Allows deflection farther past yield point w/o part failure
  • Useful for snap-fits and buckles
Higher Creep Resistance
  • Better maintains overall shape over long exposures to loads
  • Maintains tighter fit in snap-fit applications 
  • Better maintains dimensions in spring-loaded applications
Much Higher Fatigue Resistance
  • More durable in high-cycle applications like continuously running gears

Delrin® offers major benefits over acetal copolymer

Specifying Delrin® for highperformance, high precision mechanical parts can allow to optimize part design and production :    

  • Increased design flexibility
  • Thinner wall sections at same physical part performance
  • Lighter parts 
  • Less material usage
  • Improved mold filling
  • Shorter molding cycle times
  • Upgrading from existing tooling delivers higher performance parts
  • For new part design and upgrading with current molds 
  • Potential for reduction in part production cost (customers quote up to 20%)

INSERT INLINE CALL OUT IMAGE Image name: DPP_acetal_copolymer_vs_Delrin_homopolymer_design_flexibility

Increased Part Design Flexibility

INSERT INLINE CALL OUT IMAGE Image name: DPP_acetal_copolymer_vs_Delrin_homopolymer_mechanical_properties

Mechanical properties comparison

For example, Delrin® 500P, our general purpose resin, significantly outperforms general purpose acetal copolymer across the entire mechanical spectrum: 

  • 80% higher yield strain
  • 65% higher flow rate
  • over 40% higher impact resistance, particularly at low temperature
  • a 30% higher strain at break
  • higher stiffness, yield strength and creep resistance
  • >1000% higher flex fatigue resistance

and Delrin® 111DP outperforms high MW copolymer by 3 orders of magnitude! 

ADVANTAGES OF DELRIN® VERSUS ACETAL COPOLYMER
     
     
Delrin® Properties Customer Advantages
Higher Yield Stress and Yield Strain

Better memory of original shape after deflection

Higher Modulus

Stiffer material allows design of thinner-walled parts leading to more efficient use of resin

Higher Flow Rates with Better Mechanical properties

Better filling of thinner-walled cavities

Useful for effectively designing thin-walled parts

Much Higher Notched Charpy Impact Strength, even at Low Termperatures

Parts capable of absorbing much more energy and more resistant to fracture

Mechanical moving components in refrigerated environments

Useful for gears in motors that change directions or stop abruptly

Higher Strain at Break

Contributes to overall toughness of part

Allows deflection farther past yield point w/o part failure

Snap-fits and buckles

Higher Creep Resistance

Better maintains overall shape over long exposures to loads

Better maintains dimensions in spring-loaded applications

Much Higher Fatigue Resistance More durable in high-cycle applications like continuously running gears

Delrin® offers major benefits over acetal copolymer

Specifying Delrin® for highperformance, high precision mechanical parts can allow to optimize part design and production :    

  • Increased design flexibility
  • Thinner wall sections at same physical part performance
  • Lighter parts 
  • Less material usage
  • Improved mold filling
  • Shorter molding cycle times
  • Upgrading from existing tooling delivers higher performance parts
  • For new part design and upgrading with current molds 
  • Potential for reduction in part production cost (customers quote up to 20%)

INSERT INLINE CALL OUT IMAGE Image name: DPP_acetal_copolymer_vs_Delrin_homopolymer_design_flexibility

Increased Part Design Flexibility

INSERT INLINE CALL OUT IMAGE Image name: DPP_acetal_copolymer_vs_Delrin_homopolymer_mechanical_properties

Mechanical properties comparison

For example, Delrin® 500P, our general purpose resin, significantly outperforms general purpose acetal copolymer across the entire mechanical spectrum: 

  • 80% higher yield strain
  • 65% higher flow rate
  • over 40% higher impact resistance, particularly at low temperature
  • a 30% higher strain at break
  • higher stiffness, yield strength and creep resistance
  • >1000% higher flex fatigue resistance

and Delrin® 111DP outperforms high MW copolymer by 3 orders of magnitude! 

ADVANTAGES OF DELRIN® VERSUS ACETAL COPOLYMER
     
     
Delrin® Properties Customer Advantages
Higher Yield Stress and Yield Strain

Better memory of original shape after deflection

Higher Modulus

Stiffer material allows design of thinner-walled parts leading to more efficient use of resin

Higher Flow Rates with Better Mechanical properties

Better filling of thinner-walled cavities

Useful for effectively designing thin-walled parts

Much Higher Notched Charpy Impact Strength, even at Low Termperatures

Parts capable of absorbing much more energy and more resistant to fracture

Mechanical moving components in refrigerated environments

Useful for gears in motors that change directions or stop abruptly

Higher Strain at Break

Contributes to overall toughness of part

Allows deflection farther past yield point w/o part failure

Snap-fits and buckles

Higher Creep Resistance

Better maintains overall shape over long exposures to loads

Better maintains dimensions in spring-loaded applications

Much Higher Fatigue Resistance More durable in high-cycle applications like continuously running gears