Core Advantages

Delrin (POM-H, acetal homopolymer) is one of the most balanced engineering plastics, offering strong dimensional stability, self-lubrication, and machinability. It is a preferred choice for applications requiring tight tolerances, low friction, and long-term reliability.

Key advantages of Delrin:

Excellent dimensional stability:

very low moisture absorption (<0.25% at 24h), maintaining precision in varying humidity - significantly better than nylon.

High mechanical strength & rigidity:

good tensile strength and flexural modulus, well-suited to load-bearing precision components.

Strong self-lubrication:

low coefficient of friction (~0.15–0.20 against steel) for smooth operation without added lubricants.

Food & medical compliance options:

FDA- and EU 10/2011-compliant grades available for direct food contact and medical-device applications.

Good electrical insulation:

high dielectric strength, suitable for many electrical and electronic components.

Excellent machinability:

stable cutting performance enables fine surface finish and complex geometries with tight tolerances.

Material Properties

Delrin (acetal homopolymer) delivers a strong combination of mechanical, thermal, and chemical properties for precision machined parts.

Technical Specifications

Property	Delrin (POM-H) Typical Value	Notes
Density	1.41 g/cm³	Lightweight
Tensile Strength	62–70 MPa	Yield
Flexural Modulus	2,800–3,200 MPa	High rigidity
Rockwell Hardness	M85–M94	Good wear resistance
Heat Deflection Temp (1.82 MPa, ISO 75)	~110 °C	Higher at lower load (~160 °C at 0.45 MPa)
Continuous Service Temperature	−40 to ~90 °C	Short-term excursions to ~120 °C
Water Absorption (24 h)	<0.25%	Very low - excellent stability
Dynamic Friction Coefficient (vs. steel)	0.15–0.20	Strong self-lubrication

Values are typical for unfilled POM-H. Actual values vary with supplier, grade, and test method; we provide datasheets on request.

Delrin vs Competing Materials

Performance	Delrin (POM-H)	Nylon 66	Acetal Copolymer (POM-C)	PTFE
Dimensional stability	Excellent	Fair	Good	Excellent
Self-lubrication	Excellent	Fair	Very good	Best in class
Mechanical strength	Excellent	Excellent	Good	Poor
Food-contact options	Yes	Limited	Yes	Yes
Machining precision	Excellent	Fair	Good	Difficult

Machining Capabilities

Comprehensive CNC machining services for Delrin, supporting precision custom parts from prototyping through production.

Processes:

5-axis CNC milling, CNC turning, drilling, tapping, and internal threading

Size capacity:

up to Ø300 mm diameter and 800 mm length (larger sizes on request)

Equipment:

high-rigidity 5-axis machining centers and precision CNC lathes

Tolerances & Surface Finish

Tolerance capability: general ±0.025–0.05 mm; ±0.01 mm achievable on critical dimensions; ±0.005 mm on selected features with grinding/lapping

Surface roughness: Ra 0.4–1.6 μm, with options for mirror polish or matte finish

Inspection: 100% CMM inspection with full dimensional reports

Plastic parts typically follow looser general tolerances than metals due to thermal expansion; we confirm achievable tolerances against ISO 20457 and your drawing requirements during DFM.

Supported Industries & Applications

Medical devices:

surgical instrument handles, precision positioning components, drug-delivery parts

Food-processing equipment:

conveyor components, valves, food-contact structures

Electronics & electrical:

insulating brackets, connectors, switch housings

Automotive:

fuel-system components, sensor housings, sliding mechanisms

Semiconductor:

cleanroom-compatible anti-static structural parts

Common Machining Challenges & Solutions

Delrin machines well, but presents specific challenges that benefit from experienced handling.

Challenge 1 - Thermal deformation during high-speed cutting

Delrin has relatively low thermal conductivity, making it prone to localized heating and distortion.

Solution: compressed-air cooling combined with micro-lubrication, plus optimized feed rates and depths of cut to control machining temperature.

Challenge 2 - Burr formation on thin walls

Thin-walled features tend to produce burrs that affect assembly and surface quality.

Solution: sharp, high-quality coated tools and dedicated deburring/polishing processes for clean, smooth surfaces.

Challenge 3 - Maintaining tight tolerances on long parts

Long components are susceptible to internal stress and bending.

Solution: pre-annealing of stock material combined with symmetrical, segmented machining strategies to control straightness and roundness.

Challenge 4 - Thread quality and strength

Delrin threads can suffer from poor profile or low strength if cut incorrectly.

Solution: specialized taps for plastics, optimized tapping parameters, and appropriate fit-class recommendations during DFM.

Why Choose Us

Specialized Delrin machining experience across medical, food-contact, and industrial programs

ISO 9001:2015 certified quality management system; FDA / RoHS documentation available on request

Rapid prototyping: samples typically delivered in 5–7 working days

Free DFM (Design for Manufacturability) review to reduce cost and improve quality

100% CMM inspection with complete dimensional reports

Flexible MOQ - from 1-piece prototypes to thousands for production

FAQ

Q1: What is Delrin commonly used for in machining?

Delrin is widely used for precision components requiring high dimensional stability, low friction, and good mechanical strength - gears, bearings, medical-device parts, food-processing components, and electrical insulators.

Q2: Is Delrin food-safe?

FDA- and EU 10/2011-compliant Delrin grades are available for direct food-contact applications. Compliance applies to specific certified grades - please confirm requirements when requesting a quote.

Q3: What tolerances can you achieve on Delrin parts?

General ±0.025–0.05 mm, with ±0.01 mm achievable on critical dimensions and ±0.005 mm on selected features supported by grinding or lapping. Achievable tolerance depends on part geometry, size, and feature accessibility.

Q4: Which is better for precision parts - Delrin or nylon?

Delrin is generally superior for precision applications due to much lower moisture absorption, better dimensional stability, and higher machining accuracy compared with nylon.

Q5: What is your minimum order quantity?

Flexible low-volume production. Prototypes start from 1 piece, ideal for product development and validation.

Q6: What surface-finish options are available?

Mirror polish, matte finish, sandblasting, and dyeing. Special coatings can be applied based on project requirements.

Q7: Can Delrin parts be painted or coated?

Yes, with proper surface preparation. Delrin's low surface energy requires specific primers or surface activation - we recommend discussing coating requirements during the quoting stage.

Q8: How do you ensure long-term dimensional stability?

We use stock-material annealing, optimized machining strategies, and strict quality control to minimize internal stress, supporting strong long-term dimensional stability.

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