Ready Plastics

Polyoxymethylene Homopolymer (POM-H)

POM-H Rod / Acetal Homopolymer / Delrin Rod

Ready Plastics’ POM-H (Acetal Homopolymer) offers higher mechanical strength, stiffness, and fatigue resistance compared to copolymer grades, making it ideal for demanding precision applications.

  • Excellent fatigue resistance for high-cycle applications
  • Used in parts requiring increased strength & toughness
  • Performs well in mechanically demanding automation systems
  • Trusted for precision tooling components where dimensional accuracy is critical
  • Widely used for parts requiring superior mechanical performance and wear resistance
Browse 133 in-stock SKUsDownload data sheetGet a quote
133 SKUs · IN STOCK
POM-H Rod / Acetal Homopolymer / Delrin Rod

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POM-H Rod

159 SKUs•20 sizes

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POM-H Sheet

210 SKUs•25 sizes

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60 POM-H Rod SKUs in stock · Same-day shipping on stocked sizes

Rods

43 sizes · 70 SKUs
Short DescriptionColorDiameterLengthStockPriceAction
Delrin 150 (POM-H) - 0.188" dia x 120 Black Rod
Blk.
0.188″120″
9660
$0.53
Delrin 150 (POM-H) - 0.188" dia x 120 Natural Rod
Nat.
0.188″120″
18950
$0.51
Delrin 100AF (POM-H PTFE) - 0.250" dia x 120 Natural Rod
Nat.
0.250″120″
810
$3.64
Delrin 150 (POM-H) - 0.250" dia x 120 Black Rod
Blk.
0.250″120″
27520
$0.56
Delrin 150 (POM-H) - 0.250" dia x 120 Natural Rod
Nat.
0.250″120″
380
$0.53
Delrin 150 (POM-H) - 0.250" dia x 60 Black Rod
Blk.
0.250″60″
5
$0.56
Delrin 150 (POM-H) - 0.312" dia x 120 Black Rod
Blk.
0.312″120″
4870
$0.80
Delrin 150 (POM-H) - 0.312" dia x 120 Natural Rod
Nat.
0.312″120″
11550
$0.71
Delrin 150 (POM-H) - 0.312" dia x 60 Natural Rod
Nat.
0.312″60″
0
$0.46
Delrin 100AF (POM-H PTFE) - 0.375" dia x 120 Natural Rod
Nat.
0.375″120″
9640
$6.87

Material Overview

What is POM-H Rod?

POM-H (acetal homopolymer, polyoxymethylene homopolymer) is a highly crystalline engineering thermoplastic within the acetal family. Produced by polymerizing formaldehyde into long, uniform chains, POM-H achieves higher crystallinity than POM-C (copolymer) grades, which translates directly into superior mechanical performance. Ready Plastics stocks POM-H acetal in sheet, rod, and tube for demanding precision, automation, and structural applications.

POM-H delivers 7,600 psi tensile strength, 12,000 psi flexural strength, and a flexural modulus of 435,000 psi — making it notably stiffer and stronger than copolymer acetal. Its short-term service temperature reaches 300°F (150°C), with a heat deflection temperature of 285°F (141°C). Very low water absorption (0.05% at 24h / 0.1% at 96h) ensures outstanding dimensional stability in humid environments. These properties make POM-H the material of choice for high-cycle precision components, load-bearing parts, and applications where fatigue resistance is critical.

Modified grades. Ready Plastics extends the POM-H line with specialty variants for application-specific performance. POM-H GF20 adds 20% glass fiber reinforcement to significantly increase stiffness and reduce thermal expansion — the choice for structural components under sustained load. POM-H PTFE incorporates PTFE to reduce friction and extend wear life in high-load sliding assemblies. POM-H UV is UV-stabilized for outdoor and exposed environments where prolonged sunlight exposure would otherwise degrade the base polymer.

POM-H vs POM-C. Choose POM-H when your application requires maximum strength, stiffness, or fatigue endurance — for example, precision gears, high-load bushings, tooling components, and automation parts in demanding cycles. For general-purpose machining, chemical resistance, or applications in wet environments, POM-C (Acetal Copolymer) remains the preferred starting point. Both grades machine excellently on standard CNC equipment and hold tight dimensional tolerances in service.

Technical Specifications

POM-H Rod properties

Typical values at 23°C / 50% RH. Values are nominal and not guaranteed; refer to lot-specific certificates of conformance for production parts.

General
PropertyTest MethodUnitValue
DensityISO 1183g/cm³1.49
Water absorption (24h / 96h (23°C))ISO%0.05 / 0.1
General
PropertyTest MethodUnitValue
Flammability (UL 94) (corresponding to)IEC—HB
Glass transition temp.ISO°C-60
Melting temperatureISO°C179
Heat deflection temp. (HDT, Method A)ISO-R°C141
Service temperature (short term)—°C150
Service temperature (long term)—°C110
Specific heat capacityISOJ/g·K1.3
Thermal conductivityISOW/m·K0.46
General
PropertyTest MethodUnitValue
Tensile strength (50mm/min)ISOMPa53
Tensile modulus (1mm/min)ISOMPa3000
Elongation at yield (50mm/min)ISO%8
Elongation at break (50mm/min)ISO%8
Flexural strength (2mm/min, 10 N)ISOMPa85
Flexural modulus (2mm/min, 10 N)ISOMPa3000
Impact strength (Charpy) (max. 7,5J)ISOkJ/m²n.b.
Shore hardness (D)ISO—81
General
PropertyTest MethodUnitValue
Surface resistivity—Ω10¹⁴

Frequently Asked Questions

POM-H Rod, answered

What is POM-H acetal?

POM-H (acetal homopolymer) is a highly crystalline engineering thermoplastic in the acetal family. It offers higher tensile strength (7,600 psi), flexural strength (12,000 psi), and fatigue resistance than copolymer grades, with a short-term service temperature of 300°F. Ready Plastics stocks POM-H in sheet, rod, and tube for precision machined applications.

What is the difference between POM-H and POM-C?

POM-H has higher crystallinity than POM-C, giving it greater tensile strength (7,600 psi vs 9,450 psi for copolymer), higher flexural strength, and better fatigue resistance. POM-C offers improved chemical resistance and thermal stability, making it the preferred general-purpose acetal. POM-H is chosen when maximum mechanical performance is the primary requirement.

What shapes and sizes does Ready Plastics stock in POM-H?

Ready Plastics stocks POM-H acetal in sheet, rod, and tube. Sizes vary by grade — see the individual grade pages or contact Ready Plastics for current stock dimensions and cut-to-size availability for both standard and modified POM-H grades.

Is POM-H the same as Delrin?

Delrin is a registered trade name for a specific acetal homopolymer product. POM-H is the generic designation for acetal homopolymer as a material class. Ready Plastics supplies acetal homopolymer under its own line, which shares the same chemical structure as Delrin but is not marketed under that trade name.

Can POM-H be used outdoors?

Standard POM-H will degrade with prolonged UV exposure. For outdoor or sun-exposed applications, Ready Plastics offers POM-H UV, a UV-stabilized homopolymer grade that resists UV-induced degradation and maintains mechanical performance and dimensional stability in exposed environments.

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