Calculate UHMW (UHMWPE) sheet, rod or tube weight from its dimensions using a typical 0.93 g/cm³ density, or find the length for a target weight.
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What is UHMW?
UHMW (ultra-high molecular weight polyethylene) is used for wear strips, liners and other low-friction components. Properties, chemical compatibility and food-contact compliance depend on the specific grade and application; confirm them with the manufacturer rather than assuming all UHMW products are interchangeable.
UHMW Weight Formulas
Every UHMW weight formula follows the same principle: calculate the cross-sectional area of the shape, multiply by the length to get volume, then multiply by density. The formulas below use inches for all dimensions and lb/in³ for density.
Flat Sheet / Square Bar: Weight = L x W x T x d
Round Bar: Weight = π x (D/2)² x L x d
Square Hollow Tube: Weight = [W² – (W – 2T)²] x L x d
Round Hollow Tube: Weight = π x (R² – r²) x L x d
Square Angle: Weight = (2WT – T²) x L x d
T-Bar: Weight = [WT + (H – T)T] x L x d
C-Channel: Weight = (2W x T1 + H x T2) x L x d
Where L = length, W = width or leg length, H = height (inner height for C-channel), T = thickness, D = diameter, R = outer radius, r = inner radius, T1 = flange thickness, T2 = web thickness, and d = density in lb/in³. To use metric inputs, convert all lengths to inches first or use a consistent metric density (kg/m³ with dimensions in meters).
UHMW Density by Grade
UHMW is available in several commercial grades, each with a slightly different density depending on fillers and processing method.
| Calculator density choice | Density (g/cm³) | Use |
|---|---|---|
| Standard estimate | 0.93 | Reference estimate for unfilled UHMW |
| Alternate estimate | 0.94 | Density sensitivity estimate |
| Custom density | Supplier value | Use your exact grade datasheet or measured density |
The calculator defaults to 0.93 g/cm³ (930 kg/m³, approximately 0.0336 lb/in³). The 0.94 g/cm³ option is an alternate estimate. Filled or modified grades can differ substantially; enter the density specified for your material. The sheet table below uses its separately stated assumption of 0.0335 lb/in³.
UHMW Sheet Weight per Square Foot
The following reference table shows the weight of a 12 in x 12 in virgin UHMW sheet at common stock thicknesses, using a density of 0.0335 lb/in³. The rightmost column shows the weight of a full 4×8 ft sheet.
| Thickness (in) | Weight per ft² (lb) | Weight per 4×8 ft sheet (lb) |
|---|---|---|
| 1/16 (0.0625) | 0.30 | 9.65 |
| 1/8 (0.125) | 0.60 | 19.30 |
| 1/4 (0.25) | 1.21 | 38.59 |
| 3/8 (0.375) | 1.81 | 57.89 |
| 1/2 (0.50) | 2.41 | 77.18 |
| 3/4 (0.75) | 3.62 | 115.78 |
| 1.0 | 4.82 | 154.37 |
| 1.5 | 7.24 | 231.55 |
| 2.0 | 9.65 | 308.74 |
These values estimate stock mass before ordering or shipping. At the table’s assumed density, a 4×8 ft sheet at 1/2 in thick weighs about 77 lb. Actual mass depends on density, dimensional tolerances and any removed material.
UHMW Compared to Other Engineering Plastics
Weight is one factor in material selection. The comparison below is a broad orientation, with properties dependent on grade, test method, temperature and loading. Use product-specific data for design; the UHMW yield-strength example is for Röchling Polystone M Natural under ASTM D638 at 73°F.
| Property | UHMW | HDPE | Nylon 6/6 | Acetal (Delrin) | PTFE (Teflon) |
|---|---|---|---|---|---|
| Density (lb/in³) | 0.034 | 0.035 | 0.041 | 0.051 | 0.078 |
| Tensile Strength (psi) | 3,100 yield (example grade) | 3,200 – 4,500 | 11,000 – 12,000 | 9,500 – 10,000 | 2,500 – 5,000 |
| Coefficient of Friction | 0.10 – 0.22 | 0.20 – 0.30 | 0.20 – 0.35 | 0.20 – 0.35 | 0.04 – 0.10 |
| Abrasion Resistance | Good; grade/test dependent | Moderate | High | High | Low |
| Max Service Temp (°F) | 180 | 180 | 220 | 180 | 500 |
| Moisture Absorption (%) | <0.01 | <0.01 | 1.2 – 2.8 | 0.20 | <0.01 |
| Food-contact status | Grade-specific | Grade-specific | Grade-specific | Grade-specific | Grade-specific |
UHMW is often chosen for sliding contact and abrasive environments. The best material depends on loading, temperature, tolerances and compatibility; general comparison ranges do not establish structural capacity or a universal wear ranking.
Key UHMW Material Properties
UHMW belongs to the polyethylene family and has very long molecular chains. Density and mechanical properties should be taken from the datasheet for the supplied grade, rather than inferred from the polymer name alone.
As one grade-specific example, Röchling’s Polystone M Natural ASTM datasheet lists density 0.93 g/cm³, tensile yield strength 3,100 psi at 73°F, Shore D hardness 62–66, and a maximum air service temperature of 180°F. These are manufacturer guideline values, not universal limits or a design approval. Read the manufacturer datasheet and test conditions.
The same example datasheet lists a dynamic friction coefficient of 0.10–0.22. Friction and wear depend on the counterface, finish, load, speed and environment. Lubrication requirements and comparative wear claims need application-specific evidence.
Where UHMW Weight Calculations Matter
Conveyor system design: UHMW wear strips and guide rails line thousands of conveyors in food processing, bottling, and package handling. Engineers need accurate part weights to calculate dead load on the conveyor frame and to size drive motors correctly.
Chute and hopper liners: Mining operations and grain elevators line steel chutes with UHMW to prevent material buildup and reduce wear. Liner panels can be 4×8 ft sheets at 1/2 to 1 in thick, and knowing the panel weight is critical for structural bolt patterns and installation rigging.
Marine fender pads and dock bumpers: UHMW is used for fender pads. Estimated mass contributes to installation and support-load calculations; fastener count and framing capacity also require the actual loads and an appropriate structural design.
Truck bed liners and dump body liners: UHMW sheets bonded to steel truck beds reduce sticking of wet sand, clay, and asphalt. The added weight from the liner affects vehicle payload capacity and must be accounted for in DOT gross weight compliance.
Specialized components: UHMW grades are also used in demanding manufacturing applications. Use the specified grade and quality requirements; a geometry-based mass estimate does not establish component performance or suitability.
Shipping and freight estimation: UHMW is sold by the pound or by the sheet. Knowing part weight before ordering allows accurate freight quoting and helps avoid overpaying for LTL shipments where weight brackets determine pricing tiers.
