POM-H Sheet — Thicknesses, Sizes & Stock Forms
POM-H sheet is flat stock produced from acetal homopolymer (polyoxymethylene homopolymer), the higher-strength variant of acetal. Its greater mechanical strength, stiffness, and fatigue resistance compared to copolymer acetal make POM-H sheet the preferred choice for fabricated wear components, structural flat parts, and precision tooling that operate under elevated loads or in demanding mechanical environments.
At a glance:
- Thickness range: standard thicknesses from 0.125" to approximately 4.0"
- Standard sheet sizes: 24" × 48" and 48" × 96"
- Thickness tolerance: close commercial tolerances
- Material: Acetal Homopolymer — Polyoxymethylene Homopolymer (POM-H)
- Color: Natural (white/off-white)
- Water absorption (24 h / 96 h): 0.05 / 0.1 %
Standard Thickness Table
POM-H sheet is stocked for saw cutting, routing, and CNC machining:
| Thickness | Sheet Sizes | Notes |
|---|---|---|
| 1/8" (0.125") | 24"×48", 48"×96" | Wear liners, shims |
| 1/4" (0.250") | 24"×48", 48"×96" | Slide plates, guide rails |
| 3/8" (0.375") | 24"×48", 48"×96" | Structural flat parts |
| 1/2" (0.500") | 24"×48", 48"×96" | High-load wear pads |
| 3/4" (0.750") | 24"×48", 48"×96" | Tooling and fixture blanks |
| 1" (1.000") | 24"×48", 48"×96" | Heavy-duty machined flat parts |
| 2" (2.000") | 24"×48" | Block-thickness applications |
Cut-to-size and non-standard thicknesses available. Contact Ready Plastics for current stock.
Mechanical & Thermal Properties
From Ready Plastics POM-H specification data:
| Property | Value |
|---|---|
| Density | 1.49 g/cm³ |
| Water absorption (24 h / 96 h) | 0.05 / 0.1 % |
| Flammability (UL 94) | HB |
| Heat deflection temp. (HDT, Method A) | 141 °C / 285 °F |
| Service temp. (long term) | 110 °C / 230 °F |
| Service temp. (short term) | 150 °C / 300 °F |
| Tensile strength | 53 MPa / 7,600 psi |
| Tensile modulus | 3,000 MPa / 435,000 psi |
| Flexural strength | 85 MPa / 12,000 psi |
| Flexural modulus | 3,000 MPa / 435,000 psi |
| Shore D hardness | 81 |
| Thermal conductivity | 0.46 W/m·K |
Typical Applications
POM-H sheet is specified where standard acetal sheet must carry higher loads or withstand greater fatigue:
- High-load wear pads and slide plates — superior wear resistance and higher fatigue strength
- Precision tooling and fixture plates — dimensional accuracy under sustained clamping loads
- Structural panels in automation systems — high stiffness-to-weight with minimal creep
- Pump faceplates and valve body sections — chemical resistance combined with elevated strength
- Food processing wear components — FDA-compliant grades available where high load and hygiene intersect
- High-cycle fabricated linkages — fatigue resistance for parts subject to repetitive stress
Machining POM-H Sheet
POM-H sheet machines with the same equipment used for copolymer acetal but may feel slightly stiffer during cutting due to its higher crystallinity. Carbide-tipped saw blades and single-flute router bits work well. For precision flat milling, standard carbide end mills deliver excellent surface finish. Stress-relieve thick sections at moderate temperature after rough machining if critical flatness is required over large areas.