DELRIN ROD / POM ROD

DELRIN ROD , POM ROD, ACETAL ROD

Dia = 12MM TO 150MM

Length = 300MM, 1000MM & 1200MM

Polyoxymethylene (POM), also known as Homo-Polymer acetal

About Delrin :-

• This is the “Homo-Polymer” grade of Acetal and Delrin® is DuPont’s trade name for it. It has excellent load-bearing qualities in both tension and compression. It will absorb minimal amount of moisture and are resistant to a wide range of solvents. The service temperature range is -29º to 85º C, intermittent at 93.3º C. It has high yield strength at elevated temperatures. Properties include low friction (very slippy), high wear resistance and ease of fabrication.
  

Advantages and Disadvantages :-

*     Good electrical and dielectric properties

*     Very-good mechanical strength

*     Very-good abrasion resistance

*     Pretty good heat resistance

*     Low water absorption

*     Low coefficient of friction

*    Typically very difficult to bond

*    Is not readily available in a flame-retardant grade

*    Susceptible to being attacked by both strong acids and oxidizing agents

What it’s used for :-

• Typical applications include high performance engineering components (e.g. gear wheels, ski bindings, fasteners, crash pegs on motorcycles). It is also widely used in the automotive and consumer electronics industry.

What not to use it for :-

• In areas where very high wear is needed, it has very good resistance but there are better materials such as Nylon and UHMWPE. Areas where strong chemicals are around, this may be the job of its close relative The Co-Polymer Acetal.

How it performs :-

• Delrin® offers high tensile strength, stiffness, and creep resistance, and significantly outperforms many other polymers on impact resistance, allowing for thinner and lighter part design.   In addition it offers outstanding low and high temperature performance, good colour ability, and good mating with metal and other polymers. It provides dimensional stability in high precision moulding and flexibility of design.

Applications include:

• Mechanical gears, slide-ways and guiding elements, housing parts, screws, nuts, fan wheels, pump parts, valve bodies.
• Electrical Engineering: insulators, bobbins, connectors, parts for electronic devices etc.
  
•  Vehicle: Fuel sender unit, Light stock (including shifter for light, turn signal),  power windows, door lock systems, articulated shells.
  
•  Medical: insulin pen, Metered dose inhalers (MDI)
  
•  Furniture: hardware, locks, handles, hinges.
  
•  Construction: Structural Glass - pod holder for point
  
•  Packaging: aerosol cans, vehicle tanks.
  

Machining characteristics :

• Delrin® rod is excellent for machining using traditional methods such as turning, milling, drilling etc. The material is free-cutting, but does require sharp tools with a high clearance angle. It usually leaves little or no burrs. The use of soluble cutting lubricant is not necessary, but is recommended. Because the material lacks the rigidity of most metals, care should be taken to use light clamping forces and sufficient support for the work piece.
• Machined Delrin® can be dimensionally unstable in comparison with metals, especially with parts that have large variations in wall thicknesses. It is recommended that such features are ‘designed-out’ e.g. by adding fillets or strengthening ribs. Annealing of pre-machined parts before final finishing is an alternative. A rule-of-thumb is that in general, small components machined in Delrin ® suffer from less warping.
  

• Delrin ® is naturally opaque white, due to its high crystalline composition, but it is also available in black. Rods are available in diameters ranging from 10mm to 200mm.

Why should you choose this material :

• Its a high performance, easily machine-able engineering plastic.  Because of its high strength, slippery-ness and resistance to impact and fatigue, it is much more economical and easier to machine than most metals .

Why not to choose this material :

• Delrin ® has been approved for some food applications, but it is not a suitable choice for food storage as it is easily attacked by acidic foods.

Food applications suitability :

• Delrin® can be used to replace metal in automated food processing equipment, with the potential to produce lighter, lower-cost and corrosion-resistant components.  Its low-friction properties make it an ideal material for improving the speed at which high-adhesion foods can be fed through a processor. It meets the U.S.  FDA standards, is USDA approved, and is not UV stabilized.

Summary :

• Basically there are two types of Acetal, Co-Polymer grade and Homo-Polymer grade. Delrin ® rod is the name usually given to the homo-polymer grade. Both grades are incredibly similar but have a few differences. Homo-polymer grade is generally used for more “mechanical/strength” applications, Co-Polymer grade works best in “chemical” applications.