Today's KNOWLEDGE Share : Difference between POM acetal Homopolymer and POM Copolymer

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Today's KNOWLEDGE Share

POM homopolymer vs POM copolymer 

POM-H: The full name is POM acetal homopolymer. It is formed by anionic polymerization of formaldehyde. A typical example is DuPont’s Delrin®. And Cylex LLC can produced Delrin® 150.


POM-C: The full name is POM acetal copolymer. It’s formed by cationic polymerization of trioxane. Cylex LLC produced the high performance ratio POM acetal copolymer.


Characteristics of POM-H and POM-C


Hardness and Stiffness

POM-H: POM-H is hard and hard

POM-C: POM-C is not as hard and stiff as POM-H.


Processability

POM-H: Low workability.

POM-C: High workability.


Melting Point

POM-H: Melting point is 172-184 °C.

POM-C: Melting point is 160-175 °C.


Processing Temperature

POM-H: The processing temperature of POM-H is 194-244°C.

POM-C: The processing temperature of POM-C is 172-205℃.


Elastic Modulus (MPa) (tensile at 0.2% water content)

POM-H: The elastic modulus is 4623.

POM-C: The modulus of elasticity is 3105.


Glass Transition Temperature (t g )

POM-H: Glass transition temperature is -85°C.

POM-C: The glass transition temperature is -60°C.


Tensile Strength

POM-H: The tensile strength is 70MPa.

POM-C: The tensile strength is 61MPa.


Elongation

POM-H: Elongation is 25%.

POM-C: Elongation is 40-75%.


Application

POM-H: Abrasive attachments for bearings, gears, conveyor belt links, seat belts and hand mixes are some examples of POM-H.


POM-C: Electric kettles, kettles, snap assemblies, chemical pumps, bathroom scales, telephone keypads, household enclosures, etc. are some of the applications of POM-C.


source : Cylex plastics


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