⚪ DELRIN / ACETAL
Delrin and Acetal Machining for Precision Parts in Albany, NY
Few materials machine as cleanly and hold tolerance as well as acetal, which is exactly why it is the default when an Albany engineer needs a precision plastic part. Sold under the Delrin trade name as a homopolymer and as copolymer grades from other producers, acetal turns into crisp gears, low-friction bushings, and dimensionally stable mechanical parts that thrive in the region's automation and medical equipment.
ISO 9001ISO 13485
The Precision Plastic of Choice
Acetal, chemically a polyoxymethylene or POM, is the polymer engineers reach for when they need metal-like precision in a plastic. It has high stiffness and strength for a thermoplastic, excellent dimensional stability, a low coefficient of friction, good fatigue resistance, and outstanding machinability. Those properties make it ideal for gears, cams, bearings, bushings, rollers, manifolds, and the countless small mechanical components that fill automation equipment.
Around Albany, that fits naturally with the semiconductor sector's material-handling and wafer-transport mechanisms, which depend on quiet, low-friction, dimensionally stable moving parts, and with medical-device assemblies that need precise, clean-running components. Acetal also resists most solvents, fuels, and moisture, holding its dimensions where nylon would absorb water and swell.
The two big families are homopolymer, best known as Delrin, and copolymer. They are similar but differ in ways that matter for specific applications, which is the first decision a buyer should make.
Homopolymer (Delrin) Versus Copolymer
Delrin homopolymer offers slightly higher mechanical strength, stiffness, and surface hardness than copolymer, plus a marginally higher rating in certain applications, which makes it a favorite for highly loaded precision parts. Delrin 150 is a common general-purpose homopolymer grade, an unfilled, medium-viscosity acetal used widely for machined parts where balanced mechanical properties and good machinability are wanted.
Acetal copolymer trades a little peak strength for better resistance to hot water, to certain chemicals, and to long-term thermal aging, and it tends to have a more uniform internal structure with less of the small centerline porosity that can appear in extruded homopolymer rod. That centerline characteristic in thick homopolymer stock is worth knowing about for parts machined from large-diameter rod where a porous core would be exposed.
For Albany buyers, the practical guidance is straightforward: choose homopolymer like Delrin when maximum stiffness, strength, and hardness drive the design, and choose copolymer when hot-water or chemical exposure, long-term thermal stability, or freedom from centerline porosity matters more. Both machine beautifully.
Machining and Dimensional Behavior
Acetal is among the most pleasant plastics to machine. It cuts cleanly with sharp tooling, produces well-formed chips, holds fine threads and crisp features, and achieves excellent surface finishes, often without coolant. This is why prototype and production machined parts come off Albany CNC equipment quickly and economically. The material does generate heat at high cutting speeds, so good chip evacuation keeps the workpiece cool and dimensionally true.
The behavior buyers must respect is thermal expansion and, for tight parts, post-machining relaxation. Acetal has a relatively high coefficient of thermal expansion compared to metals, several times that of steel, so a part that fits perfectly at room temperature can bind or loosen across an operating temperature range when it mates with metal components. Designers should account for this in clearances and fits.
Acetal also has low moisture absorption, which is a real advantage over nylon for dimensional stability, but it is not zero, so for the most precision-critical parts, a stress-relief or conditioning step before final machining improves long-term stability.
Frequently Asked Questions
Delrin is a brand name for acetal homopolymer made by one major producer, while acetal is the generic name for the polymer family, which also includes copolymer grades made by various manufacturers. So all Delrin is acetal, but not all acetal is Delrin. The meaningful engineering distinction is homopolymer versus copolymer. Homopolymer, including Delrin, has slightly higher mechanical strength, stiffness, and surface hardness, making it preferred for highly loaded precision parts. Copolymer has somewhat better resistance to hot water and certain chemicals, better long-term thermal stability, and a more uniform structure that avoids the small centerline porosity sometimes seen in thick extruded homopolymer rod. For most Albany machined parts, either works well and both machine excellently, so the choice comes down to whether you need maximum strength and hardness, favoring homopolymer, or chemical and hot-water resistance with freedom from centerline porosity, favoring copolymer. When you request a quote, specify which family you need rather than just saying acetal, especially if the application has hot-water exposure or uses thick stock.
Delrin 150 is a common general-purpose acetal homopolymer grade, an unfilled, medium-viscosity resin that offers a well-balanced combination of strength, stiffness, toughness, and machinability. It is one of the standard go-to grades for machined precision parts because it delivers the classic Delrin property set without any special fillers or modifications, making it predictable and widely available through distribution. Use Delrin 150 for general mechanical components like gears, bushings, bearings, rollers, manifolds, and structural plastic parts where you want reliable mechanical performance and clean machinability, which describes a large share of the automation and equipment parts made around Albany. If your application needs something special, there are modified grades: filled or reinforced versions for higher stiffness or wear, low-friction grades with added lubricants for bearing applications, and FDA-compliant or medical grades for food-contact and device work. But for a straightforward, dimensionally stable, well-machining precision part, Delrin 150 is the sensible default, and its ready availability keeps lead times short.
Acetal holds tolerance very well at stable temperature, which is a major reason it is the precision plastic of choice, but you must account for its thermal expansion across an operating range. Acetal has a coefficient of thermal expansion several times higher than steel, so a part machined to a precise fit at room temperature can grow or shrink noticeably as temperature changes, and that becomes a problem when the acetal part mates with metal components that expand much less. The consequence can be binding when warm or excessive clearance when cold. The way to manage it is in the design: build appropriate clearances into fits, avoid press-fitting acetal tightly into metal across a wide temperature range, and where mating tolerances are critical, calculate the expansion over the expected temperature span. Acetal also has low but non-zero moisture absorption, so for the most dimensionally critical Albany parts, a stress-relief or conditioning step before final machining helps long-term stability. Discuss the operating temperature range with your machine shop so the fits are designed correctly from the start.
Yes, acetal is one of the best plastic choices for gears, bearings, and bushings, and it is used heavily in exactly these applications. Its combination of high stiffness and strength for a thermoplastic, low coefficient of friction, good wear and fatigue resistance, excellent dimensional stability, and outstanding machinability makes it nearly purpose-built for moving mechanical parts. Acetal gears run quietly, resist wear, and self-lubricate to a degree because of the low friction, which suits the material-handling and automation mechanisms common in Albany's semiconductor equipment and medical-device assemblies. For bearing and bushing applications with higher loads or speeds, there are internally lubricated acetal grades that add PTFE or other lubricants to further reduce friction and wear. The main caution is the same thermal expansion consideration that applies to all acetal parts: design the running clearances with the operating temperature range in mind so a gear or bushing does not bind when it warms up. With that accounted for, acetal delivers durable, precise, quiet-running mechanical components at a fraction of the cost and weight of metal.
Yes. Albany's medical-device manufacturing base includes ISO 13485 certified shops capable of producing acetal parts to medical requirements, and acetal is a common material for device components because it machines precisely and is available in compliant grades. For medical work you will want to specify a medical or FDA-compliant acetal grade, require material traceability back to the resin lot, and state any biocompatibility or cleanliness requirements up front. Be aware that acetal has specific sterilization considerations, since it tolerates some methods better than others, so confirm the intended sterilization process with your supplier to ensure the chosen grade is compatible. Cleanliness during machining also matters for device parts, so segregation from other materials and contamination control should be part of the spec rather than an assumption. The practical step for an Albany buyer is to engage an ISO 13485 shop early, name the grade and documentation deliverables explicitly, and confirm sterilization compatibility, so the supplier scopes the material, process, and certification correctly from the outset.
Last updated: July 2026
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