ACETAL ROUND

Acetal provides high strength and stiffness coupled with enhanced dimensional stability and ease of machining. As a semi–crystalline material, acetal is also characterized by a low coefficient of friction and good wear properties–especially in wet environments. Because acetal absorbs minimal amounts of moisture, its physical properties remain constant in a variety of environments. Low moisture absorption results in excellent dimensional stability for close–tolerance machined parts.

In high mositure or submerged applications, acetal bearings outperform nylon 4 to 1. Acetal is ideally suited for close tolerance mechanical parts and electrical insulators which require strength and stiffness. It also offers resistance to a wide range of chemicals including many solvents.

Delrin, a homopolymer acetal, is also manufactured and stocked in rod and plate. It offers slightly higher mechanical properties than Acetron® GP Acetal, but may contain a low–density center, especially in larger cross–sections. Copolymer acetal also offers better chemical resistance than homopolymer acetal. Unblended Delrin AF, offers a slightly higher limiting PV and lower coefficient of friction due to additional PTFE content. This added PTFE typically decreases the wear capability and impact strength.

Copolymer acetal is preferred to Delrin where centerline porosity is concerned. Acetal copolymer resin is produced under several brand names including Celcon & Ultraform. Premium brand: Acetron GP

Delrin® is an acetal homopolymer with an excellent balance of properties that bridges the gap between metal and plastic. Delrin Sheet is known for low moisture absorption, high tensile strength, creep resistance, and durability. With chemical resistance to hydrocarbons, solvents and natural chemicals, Delrin rods are ideal for industrial applications. Delrin Acetal's overall combination of physical, tribological and environmental properties make it ideal for many wear and mechanical applications. Parts exposed to a wet environment, like pump and valve components, are especially suitable. Other common uses for Delrin rods include gears, bearings, bushings, rollers, fittings and electrical insulator parts. Features of Delrin Acetal Sheet: Good dimensional stability Low moisture absorption - Delrin sheet can be used in wet environments with little effect on performance or dimensions. Excellent machine-ability High fatigue endurance High strength and stiffness properties Superior impact and creep resistance Chemical resistance to fuels and solvents Natural grade is FDA, NSF and USDA compliant Good wear and abrasion properties.

 Cont. Service Temperature 185 F

• 20% PTFE Fiber Filled

• Low Coefficient of friction

• Enhanced wear properties

• Excellent for low cost Bearings

• Great sliding properties

• Rods up to 6” Dia & Plate up to 4”

Delrin 100 AF is a 20% PTFE fiber filled acetal that is unblended, meaning the resin is manufactured and packaged by Dupont and extruded “as is”. Delrin 100 AF offers a slightly higher limiting PV and lower coefficient of friction than Delrin AF Blend due to the additional PTFE content. However, the additional PTFE typically decreases the wear capability, tensile and impact strength. Delrin 100 AF is more expensive than Delrin AF Blend and is less widely available.

Applications incude :-

Gear wheels with small modulus

Cams

Bearings and gears with small clearances

Heavily loaded bearings and rollers

Snapfit assemblies

Dimensionally stable precision parts

Valve seats

Electrically insulating components

Typical Physical Properties

Color                                                            Natural and Black

Durometer Hardness, Shore D                        85

Tensile Strength                                            9,500 psi

Water Absorption 24 hrs                                 0.20%

Tensile Elongation at break                             30%

Shear Strength                                              8,000 psi

Specific Gravity                                             1.41

Continuous Service Temperature (Max in air)   180° F

Dielectric Strength                                         420 v/mil

Acetron AF POM-H acetal is a unique thermoplastic material for use in moving parts in which low friction and long wear are important. It is a combination of Teflon fibers uniformly dispersed in Delrin acetal resin. This combination produces a material that has strength, toughness, dimensional stability and good machinability, plus improved wear characteristics over unfilled Delrin. Delrin AF Blend, most commonly supplied as a 2:1 blend of Delrin AF100 and Delrin 150 resins, has excellent sliding/friction properties. Bearings made of Delrin AF Blend sustain high loads when operating at high speeds and show reduced wear. These bearings are also essentially free of slip-stick behavior because the static and dynamic coefficient of friction are closer than with most plastics. Delrin AF Blend retains much of the strength that is inherent in unmodified Delrin acetal. Some properties are changed due to the addition of the softer Teflon fiber. The natural color of Delrin AF Blend is dark brown.Data provided by Quadrant Engineering Plastic Products from tests on stock shapes and parts produced by Quadrant EPP.

 Acetal round pictures: