When selecting materials for manufacturing, cost is a crucial factor that can make or break product profitability. Two of the most commonly used thermoplastics, POM (polyoxymethylene) and nylon, have different cost profiles that impact material selection. This article provides an in-depth cost analysis and comparison of POM vs. nylon for US manufacturers.

Raw Material Cost Comparison

The base resin price represents a significant portion of total costs for plastic parts. Currently, POM resin pellets range from $2.50-3.50 per pound while nylon pellets are $1.50-2.50 per pound. With nylon’s lower density, the material cost per cubic inch of nylon is actually higher than POM.

When weighing POM vs. nylon, POM maintains a noticeable cost advantage in raw material pricing. For 1,000 lbs of materials, POM would be $250-350 cheaper than nylon based on current market rates. This advantage can make POM the more appealing choice strictly from a material cost perspective.

Manufacturing and Processing Cost Differences

Converting raw plastics into finished parts involves additional expenses. POM holds some manufacturing cost benefits over nylon. POM melts at lower temperatures, enabling faster cycle times in high-volume injection molding. POM processing also causes less tool wear over time.

Faster cycles and lower tooling costs contribute to POM’s economic advantage. Analysis of overall plastic part production shows POM with 5-15% lower processing costs compared to nylon. Waste rates due to rejects and quality issues are also lower with POM.

Cost Per Unit Analysis

The above factors point to POM having a lower cost profile. However, when analyzing cost per finished part, the picture changes. While POM has material and manufacturing cost benefits, nylon parts often require less secondary machining and finishing.

For a simple plastic bracket, the nylon part may be ready after molding. The POM bracket may require drilling holes and CNC work to achieve the tight tolerances in the design. This erodes some of POM’s cost savings, especially in high volumes.

As part complexity increases, however, POM’s cost-effectiveness improves. The extra machining provides necessary dimensional precision and surface finishes that maximize POM’s performance advantages. Lifetime part costs can be lower even if upfront part price is slightly higher.

Key Applications Where POM Delivers Cost Efficiencies

While nylon has advantages for high volume, basic components, there are certain applications where POM is clearly the more cost-efficient choice:

• Parts requiring very tight dimensional tolerances and stability under load, temperature changes, and moisture. The extra machining of POM is worthwhile to achieve precision.
• Components with critical wear surfaces or friction points. POM’s durability leads to longer part lifespan and less frequent replacement.
• Production equipment parts enduring constant motion and loads. POM’s lubricity enables smoother operation and higher uptime.
• Applications where nylon would require expensive additives to improve wear or reduce friction. Base POM plastic already includes these traits.

Both POM and nylon offer favorable economics that make them viable for mass production. POM can provide raw material and processing cost benefits, while nylon may be cheaper for simple, high volume parts needing little secondary work. When performance requirements call for tight dimensional tolerances, wear resistance and low friction, POM’s advantages outweigh slightly higher part costs. Considering the unique cost structure and performance of each material leads to optimal selections.

When selecting materials for applications involving friction and wear, engineers must evaluate key properties like abrasion resistance, lubricity, and friction coefficients. Two popular thermoplastics, POM (polyoxymethylene) and nylon, perform quite differently in these areas. Analyzing their wear and friction characteristics provides insight into their suitability for different operating conditions.

Wear Resistance Comparison

Wear resistance depends heavily on a material’s hardness and toughness. POM has high hardness and strength, conferring excellent resistance to abrasion and erosion. Its hardness level on the Rockwell scale reaches R125, much higher than nylon’s R115-R120 rating. This extra hardness gives POM up to 5 times more resistance to abrasive wear over nylon in real-world applications.

Nylon also demonstrates good abrasion resistance, though POM performs better under high stress and continuous loads. In terms of frictional wear, POM experiences very low volume loss due to its intrinsic lubricity. Nylon has higher wear rates under sliding friction conditions, especially with higher normal forces and velocities. Over time, the advantages of POM’s wear resistance become even more pronounced.

Sliding Friction Coefficients

Friction coefficients represent the ratio of friction force to applied load. The coefficient of dynamic friction relates to moving objects, while static friction involves stationary contact. POM possesses low static and dynamic friction coefficients around 0.25-0.30. Nylon’s static and dynamic values run higher at 0.5-0.7.

POM’s molecular structure gives it an inherent lubricating capability that nylon lacks. The strong carbon-oxygen bonds in the POM molecule allow sections to regularly reorient themselves under friction, maintaining a lubricating layer. This allows POM to outperform nylon in continuous sliding or rotating applications.

Performance Under Friction

When subjected to high loads and constant friction, POM maintains its low friction properties without seizing up. The same cannot be said for nylon, which loses lubricity over time leading to performance declines. For example, POM excels in production equipment with chains, bearings, and gears under constant motion. It also makes an ideal material for consumer product components involving frequent human contact and movement.

The self-lubricating properties of POM also give it a noise reduction advantage. Applications using POM components tend to produce less audible squeaking and friction noise compared to nylon alternatives. This quieter operation improves the consumer experience.

When reviewing the wear resistance and frictional characteristics, POM provides superior performance under challenging conditions requiring durability. With excellent abrasion resistance and natural lubricity, POM is ideal for low-friction, high load environments involving continuous contact and motion. While nylon resists wear decently in light duty applications, POM outperforms nylon where friction is constant and loads are heavy.

When selecting materials for different components and parts in consumer products, engineers must balance factors like cost, durability, and manufacturing requirements. Two thermoplastics often considered are polyoxymethylene (POM) and nylon. While nylon has been a popular choice for years, POM offers some advantages that make it outperform nylon in certain applications. 

POM vs Nylon in Appliance Components

In appliances that utilize water and get washed regularly, POM can be the better material option compared to nylon. One case study looked at food processor blades – those made of nylon tended to warp and degrade over time when exposed to hot water and dishwasher cleaning cycles. POM blades maintained their shape and performance after repeated washings.

Another example is humidifier water tanks. The humidity and temperature fluctuations in these appliances contributed to cracking in nylon tanks. Switching to POM fully eliminated the cracking issue for one major manufacturer. The improved thermal and chemical resistance of POM made it outlast nylon.

POM vs Nylon in Power Tools

Power tools like drills operate under high torque and temperatures, where POM also has advantages over nylon. One power tool company replaced nylon gears with POM, which reduced wear and friction while improving durability. This translated into tools that could handle more heavy-duty use before needing repair.

POM bushings are another power tool component that see heavy wear. Milwaukee Tools switched from nylon bushings to POM bushings in their latest high-use models, increasing lifespan and reducing noise from friction. The POM parts handled heat generation and load impacts much better compared to nylon.

POM vs Nylon in Electronics

Consumer electronics represent another application where POM has started replacing nylon. For example, Sony chosen POM for many components in their latest Playstation 5 controllers, citing both lower costs and easier coloring while retaining strength compared to nylon.

POM’s superior electrical insulation properties also make it an alternative to nylon for connectors and other components that require insulation. POM maintains its dielectric properties across a wide temperature range, outperforming nylon.

When looking at these real-world examples, we see that POM can outperform nylon in certain high-impact consumer product applications. From food processor blades able to withstand hot water, to humidifier tanks not cracking under humidity, to power tool components lasting longer under high torque, POM demonstrates advantages. Its unique mechanical, chemical, and electrical properties allow it to outlast nylon when factors like heat, chemicals, torque, and humidity are present.

While nylon has been popular for years, the case studies show POM’s superior performance under stress. Considering POM as an alternative can result in appliances, power tools, and electronics with improved lifespans. POM’s properties translate to consumer products that can handle real-world conditions and avoid failure. When performance matters, these examples make clear that POM can be a better material choice than nylon.

Engineering thermoplastics like POM (acetal) and nylon play vital roles across industrial manufacturing sectors. With a balanced mix of mechanical, thermal, and chemical properties, cost-effectiveness, and production scalability, POM and nylon parts are ubiquitous. Understanding where each material excels guides appropriate selection for optimal performance.

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In automotive applications, POM’s dimensional stability, low friction, and heat resistance allow it to withstand demanding engine environments. POM timing gears maintain precision synchronization of valve and camshaft timing at elevated temperatures. Fuel system components like fuel rails and pump housings made of POM endure hydrocarbon fuels while providing vibration damping. Pedal assemblies and gear shift levers take advantage of POM’s low friction surface.

Nylon excels in underhood parts needing heat and UV resistance like air intake manifolds and tubing. As wire and cable insulation, nylon jacketing resists abrasion, fuels, and oils. Inside vehicles, molded nylon interior parts offer sound dampening, abrasion resistance, and styling flexibility.

Across consumer products, POM and nylon continue complementing each other in appliances, electronics, sporting goods, textiles, and luggage. POM provides dimensional precision in gears, bearings, and pumps within washing machines, blenders, mixers, and vacuum cleaners. Nylon luggage and backpacks withstand travel abuse while remaining lightweight.

Industrial machinery heavily leverages POM’s stiffness, hardness, and low-friction. Gears, rollers, latches, fasteners, and bushings made of POM endure continuous operation and heavy loads. Nylon contributes to less critical components like bolts, washers, and spacers that benefit from nylon’s noise dampening.

POM’s FDA compliance makes it ideal throughout food processing machinery as bearings, rollers, slicer blades, and robot grippers. Nylon is avoided in food contact applications without additional regulatory approvals. Medical devices use machined POM parts for precision instruments and housings requiring chemical resistance. Nylon excels in single-use medical tubing and catheter lumens.

Aerospace applications take advantage of POM’s stability, electrical insulation, and flame resistance for uses like connectors, insulators, and structural components. Nylons serve interior panels and auxiliary parts needing a balance of strength, temperature resistance, and fire retardance.

In summary, POM and nylon cover a wide range of engineering part requirements across industries. Matching application needs to material capabilities drives proper selection. Both thermoplastics will continue serving critical roles thanks to their complementary performance profiles.

Machining is a critical manufacturing process for producing plastic parts and products. The machining behavior of plastics can vary widely depending on the material. Two of the most common thermoplastics, POM and nylon, have markedly different machining characteristics. Understanding these differences is imperative for efficient, high-quality machining.

POM Machining Characteristics: POM is renowned for its stellar machinability. It machines like a metal, holding tight dimensional tolerances without distortion. POM’s thermal conductivity prevents localized heat buildup, allowing high speeds and feeds. This results in very low cutting forces, power consumption and tool wear. POM’s crisp edges and ability to capture fine details enable precision machined components like gears or bearings. Surface finishes down to 0.2 microns are possible with POM machining.

Nylon Machining Characteristics: In contrast to POM, nylon is notoriously more difficult to machine precisely. Its lower thermal conductivity leads to melting, smearing, and gumming on cutting tools. Nylon’s tendency to grab and stick to tools accelerates tool wear. Higher cutting forces are required, increasing power needs. The additional heat generated can limit cutting speeds and feeds. While dimensionally stable nylons are available, achieving tight tolerances is still challenging. The moderate surface finish of nylon usually requires post-machining operations.

Machining Recommendations: Adjusting parameters like tool geometry, feed rates, depth of cut and use of coolants can aid nylon machining. HSS tooling with sharp cutting edges and high positive rake angles perform better. Flood cooling is suggested to prevent melting. Roughing and finishing operations may need to be optimized differently for nylon versus POM. POM can often be machined in a single pass.

Application Examples: For precision components like gears or bearings, POM’s stellar dimensional stability would be highly beneficial. Where dimensional accuracy is less critical, such as housings or enclosures, nylon may be suitable. In all cases, the plastic’s machinability must be matched to the part requirements.

In summary, POM’s excellent thermal conductivity and stability result in superior machining behavior over nylon. POM allows higher speeds and precision while reducing tool wear and power needs. Understand your plastic’s machinability characteristics relative to your application requirements when selecting a material. With the right techniques, even challenging plastics like nylon can be machined successfully.