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Pom-H

Pom-H, called polyoxymethylene homopolymer, is one of the classes of engineering thermoplastic. This polymer possesses excellent tensile strength, rigidity, hardness and resistance to deformation on prolonged load. Pom-H possesses good properties for sliding and is wear resistant which makes it useful in low clearance high precision applications. Pom-H is widely being compared with POM-C, another similitude of polyoxymethylene copolymer, however POM-H has superior mechanical properties as such than POM-C.

Material Type

Engineering Plastic

Alternative Names

Polyoxymethylene Homopolymer, Domestically known as Delrin

Process Compatibility

POM-H can withstand processes demanding high mechanical performance like machining. Chemical resistance is lower than POM-C as a copolymer and it suffices where strong chemicals with 4-9 pH are used. The polymer is designed for parts where high stiffness, low friction, and good shape retention are needed.

Pom-H
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Jason xue

Kingsun's senior machining engineer

Pom-H Properties

Material Pom-H has specific features properties that improve the performance in various uses with the expected toughness and practicability to fit the industry.
1

Mechanical Properties

  • Tensile strength: About 78 MPa (11,000 PSI)
  • Flexural strength: About 106 MPa (13,000 PSI). However, for this resin, it is usually mannered over 80 MPa for any merchandise
  • Hardness: Rockwell M Scale. 88
  • Impact Resistance: Charpy impact unnotched – no break; Charpy impact notched – 10 kJ/m²
2

Physical Properties

  • Density: 1.43 g/cm3
  • Moisture Absorption: Very little moisture absorption, hence dimensional stability is kept.
3

Thermal Properties

  • Heat Deflection Temperature (HDT): 110°C (230°F) at 1.9 MPa.
  • Melting Point: 180°C (356°F).
  • Thermal conductance: 0.31 W/(K.m) a good polymer composite for heat sink applications
4

Electrical Properties

  • Dielectric strength: Applicable to that of high electrical insulation so it is used almost only for electronic application
  • Electrical Resistivity: This material is also a good electrical insulator but may allow some low electrical conductivity which is not disturbing in isolating medium
5

Post Treatments

Standard machining processes on POM-H can do post-treatments to achieve no. However, it can be polished or annealed to relieve internal stresses and improve surface finishes.

6

Common Applications

  • Automotive Industry: It is used in gears, bushings, and fuel systems components because of its outstanding mechanical strength and low friction
  • Electronics: It is used in connectors and insulators because of its good electrical properties.
  • Food Processing: These are used for parts such as conveyor belts and food-grade machine parts due to their non-wearing ability and food contact use.
  • Industrial Equipment: Can be utilized in production of high dimensional parts due to excellent dimensional stability and high load bearing.

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Frequently Asked Questions (FAQs)

Q: One question here I would like to ask what is POM-H and what is its difference from POM-C?

A: POM-H, known as homopolymer acetal or Delrin® among others, belongs to a thermoplastic called polyoxymethylene (POM). Its structure is different from POM-C (copolymer acetal) thus giving it a slightly higher melting point, higher crystallinity and better mechanical properties. POM-H is mostly characterized by high ultimate strength and wear resistance, dimensional accuracy and stability than POM-C.

Q: What are the main features of POM-H, particularly in regard to its geometry and mechanical properties?

A: The main features of POM-H are the following: high tensile strength, rigidity and hardness, excellent stability of dimensions, good abrasion and wear resistances, low friction coefficient’ and favorable machinability. It also provides good electrical insulation and chemical resistance.

Q: What are the target industries of POM-H acetal, particularly those that require high-performance materials?

A: POM-H is aimed at and used in many industries e.g automotive, consumer electronics, industrial machinery and conveyor systems. Due to its properties, it is widely used in areas where high precision, high wear and low friction characteristics such as gear, bearing and other mechanical parts are needed.

Q: What are the technical details of POM-H?

A: The melting point of POM-H is around 175° C, the tensile strength is in the range of 60 – 70 MPa and the coefficient of friction is in the range of 0.2 – 0.3. The molecular structure of the polymer is highly crystalline (approximately 75 – 80%), which ensures its excellent mechanical properties, high stiffness, and good dimensional stability.

Q: Are there some stock programs in which POM-H is included, particularly those that feature polyacetal homopolymer products?

A: Yes, POM-H stock shapes encompass a variety of forms and are readily available from a number of suppliers to the marketplace. For example, Ensinger provides POM-H stock shapes under the Tecaform® AD trade name. Other common trade names include Acetron®, Ertacetal® H and Delrin® 150. These stock programs usually include rods, sheets and tubes in different dimensions.

Q: How do you rate POM-H material in terms of acetal grades, particularly when considering its high stiffness?

A: POM-H is a homopolymer acetal which incorporates most Propositioning Strength, stiffness & wear resistance compared to copolymer acetal (POM-C), and is often referred to as Delrin. On the other hand, POM-C is advantageous in that it has better chemical resistance & ease of processing. The decision is case to case depending on the needs of the application.

Q: Is there any interesting feature about POM-H regarding its machinability?

A: Yes, POM-H has good machinability. It can be machined easily by using simple operations like turning, milling, and drilling and other conventional methods. With a low coefficient of friction and good dimensional stability, it can also assist in the manufacture of more complicated parts with more than one movement.

Q: What are the advantages of using POM-H in plastic parts?

A: There are several advantages for plastic parts with respect to POM-H, these include; high strength as compared to weight ratio, good resistance to wear, low coefficient of friction, good dimensional stability, and standing up to exposure to a number of chemicals. These features make it possible to be used in areas where the parts need to be very precise, have low friction, and last for long periods of time even when subjecting them to wear.

Q: How does POM-H perform in terms of wear resistance?

A: POM-H possesses high strength as well as sliding characteristics as well as good wear resistance. POM-H furthermore possesses a high degree of crystallinity as well as a structurally high molecular weight which enables the Polymer to sustain high abrasion resistance and resist dimensional change under imposed loads. This makes it viable for the use in rings, belts, pulleys, and other wear parts that are constantly in motion.

Q: What is the impact strength of POM-H?

A: POM-H has reasonable impact strength, though this property is slightly inferior to that of POM-C. The actual impact strength may fluctuate according to the grade and manufacturing method, gentle is typical from 5-10 kJ/m². Due to this reason, POM-H is well applied in the circumstances where impact strength is required in addition to the basic stiffness and hardness of materials.

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